Another carb question.

[barelycompetent]

Hey all, so apparently my carbs are leaking again, I think I have narrowed it down to my accelerator pump.  Every time I twist the throttle I hear a little spurt noise, and after a few twists of the throttle it starts dripping onto the starter cover.  Can anyone tell me if I order this kit will that take care of the problem, or is there a rebuild kit for the accelerator pump that I need to order?  All seals on the bowls have been replaced, the o rings on the fuel rail have been replaced, its just like I said, engine off I twist the throttle and I hear a little spurt noise, then it drips.  Its been getting worse over the last few days.  Heres the kit, and thanks for any advice.

http://www.ebay.com/itm/161011776561?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649

[Johnnylevi]

you can find a cheaper K&L accel. pump than that. I think i usually see em for 20+5 for shipping. It sounds sort of like the floats are stuck or something? Do you have the adjustable floats or the plastic ones? If they're adjustable did you adjust them?

[barelycompetent]

The floats are plastic, and I just checked them all when I replaced all the needles and seats last week lol.  The pump was leaking before that though, its just getting worse is all.  Where can I locate one of those kits you are talking about, and would that take care of it, or like I said is there a rebuild kit I would have to buy?  Thanks for the reply!

[Johnnylevi]

So... i might have lied a little bit...  Its a parts plus, but I don't think it should make a huge difference.

http://www.ebay.com/itm/261205629599?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

Idk what else could make it do that.

[seestheday]

Here it is for $15.  http://www.siriusconinc.com/pro-detail.php?pid=&product_id=1110

Can you see where in the carb it's dripping from?

The accelerator pump is on carb 2.  Have you taken the accel pump off and had a look at it?  I would do that before ordering a new part.  If the diaphram is torn or has any pinholes then get a new one.

If the pump is working perfectly then it will spray gas into the throat of the carbs.  Maybe you're leaking gas from somewhere else as a result of the gas being sprayed correctly by the accel pump?

[barelycompetent]

I havent pulled it off yet, but I will pull it and inspect it.  Im pretty sure thats where its leaking from, Ive replaced just about all of the seals, and o rings on all 4 carbs.  Like I said when I twist the throttle with the bike off, it makes a spurt sound and if Im looking at the carbs from the left side when I do it, its coming from the accelerator pump.  Inspecting it before I order parts though is sound advice, I was just really hoping I wouldnt have to pull the carbs again lol.

[Johnnylevi]

oh! what about the small o ring on the #2 carb. there should be one where the bowl meets the carb body

[barelycompetent]

Well I pulled the carbs again last night and inspected the accelerator pump.  Didnt appear to have any pin holes and didnt appear to be too worn.  Alot of fuel all over the place though because of removing the carbs so it was hard to see exactly where its coming from.  I tightened down all the screws on everything, bowls, and pump and I manually moved the throttle linkage, could still hear the spurting sound but couldnt really tell if it was still leaking or not.  Im guessing Im gonna have to put them back on, let the bowls fill up and move the throttle linkage again.  Im probably going to just replace the pump diaphram while I already have them off though, save me the trouble later.  As for the little o ring on the number two bowl, Johnny I think you might have just hit upon the one that I havent replaced!  If you could maybe show me a pic of which one you are talking about I can check it while I have the carbs off!  Thanks again for all the replies and advice!

[seestheday]

That little o ring is easy to lose.

Also, you don't have to put the carbs back onto the bike to fill them full of fuel. No reason why you can't just put fuel in them off the bike. Just keep them away from open flames and dispose of properly.

Sent from my BlackBerry device

From: barelycompetent [via Honda CB750'S]

Sent: Saturday, April 27, 2013 8:59 AM

To: seestheday

Subject: Re: Another carb question.

Well I pulled the carbs again last night and inspected the accelerator pump.  Didnt appear to have any pin holes and didnt appear to be too worn.  Alot of fuel all over the place though because of removing the carbs so it was hard to see exactly where its coming from.  I tightened down all the screws on everything, bowls, and pump and I manually moved the throttle linkage, could still hear the spurting sound but couldnt really tell if it was still leaking or not.  Im guessing Im gonna have to put them back on, let the bowls fill up and move the throttle linkage again.  Im probably going to just replace the pump diaphram while I already have them off though, save me the trouble later.  As for the little o ring on the number two bowl, Johnny I think you might have just hit upon the one that I havent replaced!  If you could maybe show me a pic of which one you are talking about I can check it while I have the carbs off!  Thanks again for all the replies and advice!

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[Lucky 1]

Please answer that question.

"Was the O ring between the carb body and the float bowl around that check valve in place?"

[barelycompetent]

Lucky Im not sure which o ring you guys are talking about.  I pulled the bowl off today, replaced the accelerator pump diaphram, checked the bowl gasket, it was good, and the only other o ring I could see was a little boot looking thing that came in the pump kit and had to be trimmed down to size.  That was in place, and I replaced that along with the diaphram and spring.  Put it all back together and its still leaking.  I dont know if the bowl gasket it off a bit or what, but I didnt see any other o rings in or around the #2 bowl.  If anyone has a pic of which one you guys are talking about, it would greatly help me in answering that question!  Thanks for the replies.

[Lucky 1]

Here is a couple of photos from the internet.

When you type words into the search engine (Google) you can then click on IMAGES instead of WEB results and see a photo from every online forum that talks about that issue.

[barelycompetent]

Well I finally had a chance to get back on the wrenches tonight and took the number two bowl off and lo and behold that o ring that Lucky and Johnny were talking about was MIA.  Of course the one I need is not in any of my rebuild kits lol so its off to the honda shop tomorrow.  Thanks again for the info guys, and Lucky did I detect a hint of sarcasm there in your relpy?  Its all good though lol its how I learn, and I always appreciate a little sarcasm!  Thanks again guys, hopefully tomorrow she is all back together and not leaking anymore!

[Johnnylevi]

Yup! Of course it isn't... My friend ordered a 100 pack for the both of us haha. I think sees posted a link on my build thread somewhere about it... It's a 901

[barelycompetent]

Well for two bucks and a little sweet talking to the clerk at the honda shop Im back on the road, and the carbs are leak free for now.  She told me I would have to buy the entire gasket kit for that o ring, and it was 49.  I turned on the charm and scored the o ring for two bucks lol.  Now that my carbs appear to be all sealed up for now, the oil is leaking out of the bottom lol.  I just cant win!  Thanks for the help guys, its appreciated!