Preparing DOHC CB750 for lengthy travel

classic Classic list List threaded Threaded
111 messages Options
123456
Reply | Threaded
Open this post in threaded view
|

Re: Preparing DOHC CB750 for lengthy travel

cdaiscool
I lubed the chain every time I adjusted it, and sometimes (typically long rides) in between.

Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
Reply | Threaded
Open this post in threaded view
|

Re: Preparing DOHC CB750 for lengthy travel

Piute

   I've worked customer service ,1st off don't draw attention to yourself but to the product ,If it's local ,there going to loss business ,by you telling others outside the business (rallies,swap-meets,bars,)others you meet that own bikes,like here.They will fill it were it hurts ,CASH .
                            1977 CB750 F2 Super Sport
<LET THOSE WHO RIDE DECIDE><RIDE TO LIVE-LIVE FOR JESUS> 
Native American from central Cal,  Kickstand UP in S.W.Missouri,
                                       
 
Reply | Threaded
Open this post in threaded view
|

Re: Preparing DOHC CB750 for lengthy travel

sgtslag
In reply to this post by cdaiscool
The recommendation is to apply lube every 300 miles.  Spray lubes have come a long way, as have chains.  Dupont makes a very good one:  Chainsaver.  It is available nearly everywhere, too, like Wal-Mart.  It is O-ring safe, too.  Cheers!
1979 CB750K (sold, 2012, but not forgotten)
1983 Kawasaki 440 LTD Belt Drive (sold, 2011)
1993 Kawasaki Voyager XII
Reply | Threaded
Open this post in threaded view
|

Re: Preparing DOHC CB750 for lengthy travel

cdaiscool

I have used Chainsaver, Dupont, and the stuff I am using right now. And because I was adjusting the chain every 300 or so, I was lubing that interval as well.

On Dec 7, 2012 7:53 PM, "sgtslag [via Honda CB750'S]" <[hidden email]> wrote:
The recommendation is to apply lube every 300 miles.  Spray lubes have come a long way, as have chains.  Dupont makes a very good one:  Chainsaver.  It is available nearly everywhere, too, like Wal-Mart.  It is O-ring safe, too.  Cheers!
1979 CB750K (sold, 2012, but not forgotten)
1983 Kawasaki 440 LTD Belt Drive (sold, 2011)
1993 Kawasaki Voyager XII



If you reply to this email, your message will be added to the discussion below:
http://honda-cb750-s.456789.n3.nabble.com/Preparing-DOHC-CB750-for-lengthy-travel-tp4031695p4033293.html
To unsubscribe from Preparing DOHC CB750 for lengthy travel, click here.
NAML
Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
Reply | Threaded
Open this post in threaded view
|

Re: Preparing DOHC CB750 for lengthy travel

cdaiscool
Need some advice.

Bike is getting horrible gas mileage; on my way to my dad's, I got 27 mpg on the highway (this was a nice, clear ride; no rain or anything). Ran at 70 mph/6k rpm most of the way; sometimes ran around 75, never went above 80 though. And that was a rare speed.

On the way back, in the rain, the bike kept cutting out, losing power. It was running, but it acted as though it was choked up; something was preventing it from breathing. It'd stay at 4k rpm, and no matter what I tried throttle-wise, it wouldn't go higher. If I gave it too much throttle, it'd die from too much gas.

I mention these, because I think there's something (possibly electrical) that's connecting these 2 things. Gas mileage is way too low, and it cutting in and out means something was messing up. It didn't ever die, just wouldn't give me enough power to keep up with traffic or pass those going slower than me.

Any thoughts/suggestions? I'm not asking because I'm going to make riding in the rain a daily occurrence, I'm asking because there's no way a 750 should be getting 27 mpg on the highway when healthy. Remember, the bike was thought to have a dead cylinder, but later tests have confirmed this was untrue, and the testing place was moronic.

tl;dr - I think I've got electrical issues on the bike and need a way to test what it is.
Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
Reply | Threaded
Open this post in threaded view
|

Re: Preparing DOHC CB750 for lengthy travel

Thorby
Not too long for me.  I read fast.

I'm no expert but if this was happening to me I'd check:
-air filter
-spark plugs
-tappet clearance (is your engine making a louder valve noise than usual?)

And since you feel it's electrical: I'd take off the lid off the timing and spark advance to make sure it's not out of adjustment, it's really easy to open.

I'll be eager to see what it was in your case, since I will be making a cross-country trip in a few months.
Proud owner of stock '76 CB750.
Reply | Threaded
Open this post in threaded view
|

Re: Preparing DOHC CB750 for lengthy travel

motogrady
Administrator
In reply to this post by cdaiscool


I'd pull the plugs, look for the 1 or 2 cylinders that seem to be dropping out.
They should be wet or soot black, the ones dropping out that is.
Trace the wiring back from there, bad spark plug wire, coil wire, cracked coil,
bare or loose wire all the way to the spark units.

27mpg, no good, my '79, 52 last tank.

Hate to go there, but mine was dropping out same way.  Highway running
it would fall on itself.  Turned out to be a clogged fuel petcock filter,
causing the fuel line to suck into itself when it got warm from the motor.

If it only does it when wet, put a hose on it in the garage when running,
wet it down till it misses then pull them pulgs and see what's up.

good luck guy.
Reply | Threaded
Open this post in threaded view
|

Re: Preparing DOHC CB750 for lengthy travel

cdaiscool
In reply to this post by Thorby
Could easily be the spark adjuster; my mechanic popped it open, saw it was set fully to one side, put it in the middle, and said "We'll perfect it later, once your exhaust is on and we're tuning the carbs."

Plugs are newer, no newer noises, and air filter is brand-new as of last year. It's always done this afaik.

I'm having the mechanic run through the bike this week; I'll have him fully adjust it per the manual (or do it myself, we'll see).

I did the o-ring chain, but need to make a video for Motorcycle Superstore (err, I mean, strike-out) to see the old chain is shot. The local shop my dad uses showed me a nifty way to see the chain is, indeed, shot. You can pull it and see it move; he said that's dangerous as its the rollers themselves worn out. Glad I changed that chain when I did. You can also hear/feel the rollers as you move the chain side-to-side.

Meanwhile, I've found that my sprockets are indeed worn from the old chain. So I'm going to put new sprockets on this week. Anyone know a decent place to get sprockets that isn't Motorcycle Superstore? Otherwise I have to order local, and they charge retail for everything...

Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
Reply | Threaded
Open this post in threaded view
|

Re: Preparing DOHC CB750 for lengthy travel

cdaiscool
In reply to this post by motogrady
My petcock is brand new as of this spring, and totally cleaned 3 weeks ago, though I apparently put it in wrong - I still have no reserve tank.

As for pulling plugs, I can do that but will they still be messed up a couple days later? I put new coils on the bike, and the wires and plugs are newer from June (wires) and July/August (plugs). I've only got maybe 2k miles on 'em.

It doesn't miss, per say, as just lose power. It reminds me as though the primaries are out of steam, but the secondaries aren't opening up. It'll do it sometimes on cold mornings as well, where it doesn't want to open up and suddenly BAM! there it goes.

It's really hard for me to describe. I'll pull the plugs Tuesday (busy all day Monday) and check those, then try to make a video on my phone that records what I'm talking about - it's very easy to hear the transition of it.
Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
Reply | Threaded
Open this post in threaded view
|

Re: Preparing DOHC CB750 for lengthy travel

motogrady
Administrator
In reply to this post by cdaiscool


Glad to see you went oring, and are going new sprockets also.
Maybe try BikeBandit.com.  I've never, but a few guys I know have said they have good deals.

You wanna play with gearing, nows the time.
Smaller rear sprocket, more top end.............
Reply | Threaded
Open this post in threaded view
|

Re: Preparing DOHC CB750 for lengthy travel

cdaiscool
Bike Bandit comes out of Canada and can take a week. I need something I can get by Thursday, as that will allow me to get it in time. My trip leaves either Friday or Saturday, weather permitting.

Technically, my trip wasn't commencing until Saturday 2 pm anyways, I was just going to go over the bike with my dad on Friday beforehand; if its bad, I just can't do that. But not a big deal, as my mechanic is looking over the bike sometime this week instead.

I have 18/45 in the bike right now. May go to a 17/46 or something. Right now, a gearing calculator says my 18/45 should be 5500 rpm @75 mph. That's a bit off, as 70 mph = 6k rpm.

I'll have to look at the tire on there and play some more tomorrow, and order some tomorrow. Joy.
Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
Reply | Threaded
Open this post in threaded view
|

Re: Preparing DOHC CB750 for lengthy travel

cdaiscool
Well, decided to go with Motorcycle Superstore again for sprockets. Going to make a video tonight of the chain issues and e-mail it to them as well as post it here. Bought through them since BikeBandit said it's 3-5 days to process the order and was $28 to ship express; M-S says should be here Thursday and was free shipping. Plus, ordering through them should make it easier to prove that, as I've said, the chain is shot and it wore out my sprockets.

Hate ordering stuff twice.

Went with a 17-40 gearing; this drops my 70 mph rpm speed about 100 rpm, gives me more room for the chain in the front, and overall should work decent for me.
Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
Reply | Threaded
Open this post in threaded view
|

Re: Preparing DOHC CB750 for lengthy travel

cdaiscool
So, in the interest of keeping people updated...

The local mechanic had their weekly people get-together last night, and I rode the bike there. It was still acting up, refusing to get that 'power spurt' if you will until 5k rpm, if it'd even go into it.

I mentioned it to the owner, and he agrees that between the mileage and how it acted in the rain, as well as that 'spurt', something (probably electrical) is going on. He's going to check the bike out today/tomorrow and get it back to me tomorrow night if at all possible.

This is the last thing that hangs in the balance for the trip. My sprockets are on their way:

Scheduled Delivery:
Thursday, 12/20/2012, By End of Day

And the oil is changed. If he can figure out the issue, I have trust that the bike will be fine. It hasn't ever left me stranded except when I've run out of gas. I'm hoping that, once they've got this fixed, my mileage will jump into the low 40's at a minimum, more with taking back roads. Hell, the new car is getting better gas mileage than the bike - I'm getting around 34 in that! I could take that, but that defeats the purpose of this trip. To enjoy the open air, to be able to enjoy nature without the metal and glass around me. To literally be as close to it as possible.

I've got a tank bag, a duffel from my dad, and the saddle bags. I'd have to venture a guess that I've got enough storage now...

Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
Reply | Threaded
Open this post in threaded view
|

Re: Preparing DOHC CB750 for lengthy travel

mitchell.lee.miller
I'm really enjoying this thread!  It's all about the ride!  I have some ideas for the trip in the way of itemized advice:

-Leather gloves (there is no substitute for good gloves).
-Sunscreen (small comforts will keep you thinking about how great the ride is as opposed to the other side).
-Toolkit (you should trust your knowledge of the bike).
-Extra old chain (just to get to a service station, should a problem come up).
-Extra clutch and brake cables (really doesn't take up much room, think about it).
-Chain lube, tire pressure (someone has already mentioned, and I have read often-you cannot go wrong over checking these things).
-Good eye wear (bright long days will leave the eyes aching, and cause a subsequent headache).
-Small First Aid Kit (you'll use it probably).

They say about the second or third day of riding straight days you go through a lull, and for everyone it is because of completely different reasons; monotony, arguments with fellow riders, or body issues.  For me it was my hind in.  Comfortable seats go a long way, Roxanne (my '77) has a no cushion.  If you can go a three hours like you did with no major body aches, your golden man!  I'm stoked for you.  

Keep posting...
1977 CB750K ~ Roxanne
1976 CJ360T
1971 CB350
1971 CL350
Reply | Threaded
Open this post in threaded view
|

Re: Preparing DOHC CB750 for lengthy travel

cdaiscool
While not leather, I've got 2 separate types of gloves I'm bringing.
My winter gloves and my summer gloves. This way, if its 70's down
south I've still got hand protection that's vented. But covers my
entire hand.

Sunscreen, I don't feel is important at this point; I'm completely
covered head-to-toe, don't plan to get down into shorts or t-shirt
(especially while riding!) and the sun's position relative to North
America, the rays aren't NEARLY as close as they are in the summer. It
really does make a quite a large difference.

Toolkit I am bringing along. Cables I'm not, but only because they're
not instantly available. That reminds me, I was going to get some
safety wire from Harbor Freight; you can make good-enough cables from
that. Chain lube, I'm bringing 2 cans. Going to bring some slime with
me as well for the tire. Someone else mentioned a tire patch kit, but
those I'd have to order, are $50, and a can of slime is more easily
replaceable. I wear glasses, so my eyewear is already covered there.
I'm going to also bring contacts just in case something happens to the
glasses. And, I have a full-faced helmet that keeps
water/bugs/rocks/dirt off the face. So I don't expect issues there.
First Aid kit is already packed.

Many thanks for the suggestions! That reminds me, I've gotta print off
the campground guide I found. Then I'll know where I'm sleeping on
Saturday night...


On Wed, Dec 19, 2012 at 2:31 PM, mitchell.lee.miller [via Honda
CB750'S] <[hidden email]> wrote:

> I'm really enjoying this thread!  It's all about the ride!  I have some
> ideas for the trip in the way of itemized advice:
>
> -Leather gloves (there is no substitute for good gloves).
> -Sunscreen (small comforts will keep you thinking about how great the ride
> is as opposed to the other side).
> -Toolkit (you should trust your knowledge of the bike).
> -Extra old chain (just to get to a service station, should a problem come
> up).
> -Extra clutch and brake cables (really doesn't take up much room, think
> about it).
> -Chain lube, tire pressure (someone has already mentioned, and I have read
> often-you cannot go wrong over checking these things).
> -Good eye wear (bright long days will leave the eyes aching, and cause a
> subsequent headache).
> -Small First Aid Kit (you'll use it probably).
>
> They say about the second or third day of riding straight days you go
> through a lull, and for everyone it is because of completely different
> reasons; monotony, arguments with fellow riders, or body issues.  For me it
> was my hind in.  Comfortable seats go a long way, Roxanne (my '77) has a no
> cushion.  If you can go a three hours like you did with no major body aches,
> your golden man!  I'm stoked for you.
>
> Keep posting...
> 1977 CB750K ~ Roxanne
> 1976 CJ360T
> 1971 CB350
> 1971 CL350
>
>
> ________________________________
> If you reply to this email, your message will be added to the discussion
> below:
> http://honda-cb750-s.456789.n3.nabble.com/Preparing-DOHC-CB750-for-lengthy-travel-tp4031695p4033902.html
> To unsubscribe from Preparing DOHC CB750 for lengthy travel, click here.
> NAML
Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
Reply | Threaded
Open this post in threaded view
|

Re: Preparing DOHC CB750 for lengthy travel

shinyribs
Administrator
Toolkit cable stand-in suggestionSafety wire sounds good!

Reply | Threaded
Open this post in threaded view
|

Re: Preparing DOHC CB750 for lengthy travel

seestheday
Whenever I see those pics I remember that guys epic motorcycle journey.  That was a great read.  Anyone have a link?  I had it bookmarked, but lost it when I switched computers.
1981 CB750K with 900 cams
90K KM's, rebuilt head, rebuilt carbs, upgraded valve stem seals

My wife's recipe website that I'm trying to help promote: Strawberries for supper. Yes, I am a lucky man.

My cb750 video site
Reply | Threaded
Open this post in threaded view
|

Re: Preparing DOHC CB750 for lengthy travel

cdaiscool
Where the kid built a bike, went on like a 5-month trip, then got home and the motor blew the next day?
Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
Reply | Threaded
Open this post in threaded view
|

Re: Preparing DOHC CB750 for lengthy travel

seestheday
Yep, I think that's the one. He went all over the states, even tried to go up to Canada but they wouldn't let him in because they thought US customs wouldn't let him back in the states given the paperwork he had on him.
Sent from my BlackBerry device on the Rogers Wireless Network

From: "cdaiscool [via Honda CB750'S]" <[hidden email]>
Date: Thu, 20 Dec 2012 11:20:07 -0800 (PST)
To: seestheday<[hidden email]>
Subject: Re: Preparing DOHC CB750 for lengthy travel

Where the kid built a bike, went on like a 5-month trip, then got home and the motor blew the next day?
Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly



If you reply to this email, your message will be added to the discussion below:
http://honda-cb750-s.456789.n3.nabble.com/Preparing-DOHC-CB750-for-lengthy-travel-tp4031695p4033957.html
To unsubscribe from Preparing DOHC CB750 for lengthy travel, click here.
NAML
1981 CB750K with 900 cams
90K KM's, rebuilt head, rebuilt carbs, upgraded valve stem seals

My wife's recipe website that I'm trying to help promote: Strawberries for supper. Yes, I am a lucky man.

My cb750 video site
Reply | Threaded
Open this post in threaded view
|

Re: Preparing DOHC CB750 for lengthy travel

cdaiscool
Hmm. I've gone looking, but nothing thus far. Shall keep looking though; I want to read it again! 



On Thu, Dec 20, 2012 at 2:48 PM, seestheday [via Honda CB750'S] <[hidden email]> wrote:
Yep, I think that's the one. He went all over the states, even tried to go up to Canada but they wouldn't let him in because they thought US customs wouldn't let him back in the states given the paperwork he had on him.
Sent from my BlackBerry device on the Rogers Wireless Network

From: "cdaiscool [via Honda CB750'S]" <[hidden email]>
Date: Thu, 20 Dec 2012 11:20:07 -0800 (PST)
To: seestheday<[hidden email]>
Subject: Re: Preparing DOHC CB750 for lengthy travel

Where the kid built a bike, went on like a 5-month trip, then got home and the motor blew the next day?
Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly



If you reply to this email, your message will be added to the discussion below:
http://honda-cb750-s.456789.n3.nabble.com/Preparing-DOHC-CB750-for-lengthy-travel-tp4031695p4033957.html
To unsubscribe from Preparing DOHC CB750 for lengthy travel, click here.
NAML
1981 CB750K



If you reply to this email, your message will be added to the discussion below:
http://honda-cb750-s.456789.n3.nabble.com/Preparing-DOHC-CB750-for-lengthy-travel-tp4031695p4033959.html
To unsubscribe from Preparing DOHC CB750 for lengthy travel, click here.
NAML

Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
123456