Re: Teaser thread...
Posted by shinyribs on Apr 26, 2015; 3:54am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/CB1100F-The-Keeper-Build-tp4053992p4056281.html
I wasn't going to do a full build thread on this bike since it's not a CB750. But, it's close. SO let's just pretend the engine is a little smaller than it actually is.
Decided to give the engine a look-at and see if it's a runner. First, as always, check the valve lash. Well, the lash is ok, but I found this.
Nice repair.
I mean, I'm all for JB Weld or epoxy, but come on. No matter, I had no plans for a mechanical tach anyway. The cam holder is still good, so I'll just weld the valvecover opening up when the time comes.
Next thing I saw was this rust. When I picked the bike up the valvecover was laying loose on the bike. Luckily, at this point I knew about the valvecover bolts, so I did check to see if all the correct hardware was there. It is. But is it so hard to just tighten it back down so water won't creep in?
But I think I may get lucky and this cam is savable. The rust wiped off with just a rag and left a healthy looking lobe behind. Thee heel has some slight pitting that is just starting,but the lobes are fine. If I repolish the heels and lose a smidge of material I won't really care. That pair of valves be run with the lash a touch on the loose side, but who cares.
So, cleaned all that up as good as I could and mounted the starter which came loose in a box of parts. Starter works!
And here's where it gets interesting...
Ok, so the story I was told: Bike was running and riding and my PO decided to sell it ( this is years ago). Guy came to look at the bike to buy it. They started the bike and was letting it warm up when the bike just shut off. Crank,crank,crank....never started. Pushed in the corner. Now it's mine.
I asked about the loose valve cover and missing parts ( starter off the bike, a couple engine mount bolts missing, foot pegs, etc). He said he pulled the valvecover wondering why the bike quit, but didn't know what he was doing so just gave up. The loose parts were a result of being vulturized through the years. I'll buy that story.
Anyway, I checked the lash. A couple tight ones, a couple loose ones, but good enough to check compression. Cylinders 1 & 4 have 0 compression. None. Nothing at all.
Cylinders 2 & 3 both have 180 psi. but 
Air hose to the plug hole leaves you hearing air pouring out of the intake boot on #4 and out both intake and exhaust on #1.
I'm putting my money on stuck valves. Since the center cylinders had such good compression I'm hoping the bores, rings and piston will be ok. We'll see...
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/CB1100F-The-Keeper-Build-tp4053992p4056281.html
I wasn't going to do a full build thread on this bike since it's not a CB750. But, it's close. SO let's just pretend the engine is a little smaller than it actually is.
Decided to give the engine a look-at and see if it's a runner. First, as always, check the valve lash. Well, the lash is ok, but I found this.
Nice repair.
I mean, I'm all for JB Weld or epoxy, but come on. No matter, I had no plans for a mechanical tach anyway. The cam holder is still good, so I'll just weld the valvecover opening up when the time comes.
Next thing I saw was this rust. When I picked the bike up the valvecover was laying loose on the bike. Luckily, at this point I knew about the valvecover bolts, so I did check to see if all the correct hardware was there. It is. But is it so hard to just tighten it back down so water won't creep in?
But I think I may get lucky and this cam is savable. The rust wiped off with just a rag and left a healthy looking lobe behind. Thee heel has some slight pitting that is just starting,but the lobes are fine. If I repolish the heels and lose a smidge of material I won't really care. That pair of valves be run with the lash a touch on the loose side, but who cares.
So, cleaned all that up as good as I could and mounted the starter which came loose in a box of parts. Starter works!
And here's where it gets interesting...
Ok, so the story I was told: Bike was running and riding and my PO decided to sell it ( this is years ago). Guy came to look at the bike to buy it. They started the bike and was letting it warm up when the bike just shut off. Crank,crank,crank....never started. Pushed in the corner. Now it's mine.
I asked about the loose valve cover and missing parts ( starter off the bike, a couple engine mount bolts missing, foot pegs, etc). He said he pulled the valvecover wondering why the bike quit, but didn't know what he was doing so just gave up. The loose parts were a result of being vulturized through the years. I'll buy that story.
Anyway, I checked the lash. A couple tight ones, a couple loose ones, but good enough to check compression. Cylinders 1 & 4 have 0 compression. None. Nothing at all.
Cylinders 2 & 3 both have 180 psi. but Air hose to the plug hole leaves you hearing air pouring out of the intake boot on #4 and out both intake and exhaust on #1.
I'm putting my money on stuck valves. Since the center cylinders had such good compression I'm hoping the bores, rings and piston will be ok. We'll see...
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