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Old 11-20-2011, 09:42 AM   #1
pbarmy OP
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My buddy has had this bike in his"collection" for as long as I've known him.Lately he's been "thining" a little.We've thrown the idea of me getting it for a couple of years now.I finally picked it up yesterday.Its not really"mine" yet and he's a little sketchy about how and when it might be.(Dont worry,I wont spend anything untill I have title in hand).It quit one day while he was riding it and he started to work on it,became frustrated and parked it.Right now it has a problem and we arent sure what.You can kick it over and it feels like its turning over but the pistons dont move.We think it may be a,1 broken crank ,2 a sheared woodruff key or 3?Diagnosis will begin soon,as my buddy SOS has a keen interest in learning aieheads and I'm always looking to expand my knowledge.Here are a few pics



























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Old 11-20-2011, 10:12 AM   #2
elite-less
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What happened when it "quit" while riding. Engine die, horrible noise, loss of power, etc…???

Have you checked the clutch or even the clutch cable free play? Might be as simple as the clutch not engaging/disengaging properly.

Can you properly move the engine/pistons if you rotate via the alternator bolt and allen key?
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elite-less screwed with this post 11-20-2011 at 10:28 AM
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Old 11-20-2011, 11:03 AM   #3
Houseoffubar
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Originally Posted by elite-less View Post
What happened when it "quit" while riding. Engine die, horrible noise, loss of power, etc…???

Have you checked the clutch or even the clutch cable free play? Might be as simple as the clutch not engaging/disengaging properly.

Can you properly move the engine/pistons if you rotate via the alternator bolt and allen key?
That's a good call! I can only imagine it's the clutch slipping, and not turning the motor. I suspect it does not really feel like it is turning over, unless there is virtually zero compression, you would feel a distinct pop, pop, pop, as the motor comes upon compression. It would be pretty hard to get that feeling, without the motor turning. My2c
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Old 11-20-2011, 11:33 AM   #4
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easy diagnosis, pop off the timing inspection cover (rubber plug next to the oil dipstick), and if the flywheel isn't turning when you depress the kick start the clutch is slipping.

Don't forget to pull the plugs when you spin it over checking if the clutch is slipping.

Either way, It's time to pull the heads, which is a very fast and easy job.
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your bike is suitably dirty. Well done.
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Old 11-20-2011, 11:59 AM   #5
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Flywheel turns when kicked over.Screwdriver in the plug hole confirms pistons not moving.He said he was going up through the gears when it just quit running,didnt elaborate on what if any noise(s) it made.Got it on the lift,gonna mess with trying to turn it over from the front. If its a big engine failure,I may have a chance for getting it next to nothing,which I would then transplant the engine from my 79R/T.(Switching the top cover so it still read 750)
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Old 11-20-2011, 12:09 PM   #6
Houseoffubar
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Wow, must be sheared flywheel bolts!?! I can't imagine a crank, or BOTH RODS so broken, that they don't turn!
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Old 11-20-2011, 12:14 PM   #7
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No matter what that motor has to come out. Get Hot
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Old 11-20-2011, 12:21 PM   #8
Houseoffubar
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Originally Posted by SOS View Post
No matter what that motor has to come out. Get Hot
Shhhhh, I'm enjoying the mystery!
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Old 11-20-2011, 01:34 PM   #9
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Heres a new twist.My buddy had started disassembly and lots of parts,bolts etc are still @ his house.I tried to use the alternator bolt to turn over the motor,but it was somewhat knackered.I busied myself with other disassembly.Pulled off the stator and was messin with the rotor.I grabbed it,gave it a turn and a puff of air hit me in the face from the sparkplug hole.Eureka,it spins.Had my son verify with a screwdriver and a light that the pistons were indeed moving.When I move it with the rotor,the flywheel moves.BUT,when I push the kickstarter,the flywheel moves but the rotor dosen'tI can feel a slight"clunk"or something near the rear of the engine.Gonna pull the tranny(one of my favorite jobs)next.Stay tuned!
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Old 11-20-2011, 06:58 PM   #10
d mc gee
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I've got a good alternator bolt, and a ratty 2-1 exhaust, and probably the fly wheel bolts. just sayin
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Old 11-20-2011, 09:55 PM   #11
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...just gotta love a good mystery!
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Old 11-21-2011, 11:05 AM   #12
pbarmy OP
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Originally Posted by d mc gee View Post
I've got a good alternator bolt, and a ratty 2-1 exhaust, and probably the fly wheel bolts. just sayin
Road trip!PBR and Yuengling for all!I can use the parts,got my John Chay rotor tool and no bolt to use.Not sure how the back flange that the flywheel attaches to is hooked to the crank,but it seems to be in that area.
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Old 11-24-2011, 01:53 PM   #13
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Bump


Let's get moving Mike! Show us how to polish a turd.
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Old 11-24-2011, 06:27 PM   #14
pbarmy OP
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Waiting for my buddy to machine down a 27 mm socket so I can stop borrowing everybody elses!Need that alternator bolt too!
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Old 11-25-2011, 04:37 AM   #15
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So what does tha tank look like? Oh, and please keep the screwdrivers out of the cylinders!

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