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Bike set for 30 years, only 4k miles, blows oil out of case, exhaust,  and smokes real bad. Will use up all the oil in the case in about 15 minutes. Changed piston and rings, no difference. Will start with starting fluid, won't rev above 3k, changed points and timing settings no different. Replaced carburetor,  no difference.  HELP ME PLEASE!

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Make?
Model?

Have you checked the valve seals?

You might wanna introduce yourself first...

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Doesent have valve seats, what it does, or rather did! was have crank seals, they are long dead. I would bet just about every seal on that motor is split or has shrunk to the point of failure. Would be a VERY smart move to fit new crank bearings at the same time as having sat that long they may well be toast so while your there for an extra tenner. Check the other significant bearings too. They can sometimes rust if they have been left without a covering of oil.

Depends on where you are but as you haven't given us ANY real information to work with I'm guessing.

You can get full seal and gaskets from fowlers. Bike has been in production as far as the engine goes for donkeys years, parts are readily available. Cycle parts not so much.

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Aaah! The bike is the title!
No wonder I couldn't see any info...

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My bad, Richard here, Meridian Idaho. Would the seals pump oil through the cylinder and piston? Or would seals cause external leaks? I have removed the exhaust and disconnected the injector pump. When I start it it still pumps oil through the piston and out the exhaust port. Any ideas anyone?

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2 hours ago, richard83642 said:

My bad, Richard here, Meridian Idaho. Would the seals pump oil through the cylinder and piston? Or would seals cause external leaks? I have removed the exhaust and disconnected the injector pump. When I start it it still pumps oil through the piston and out the exhaust port. Any ideas anyone?

Good call on the crank seals, thanks. Got them ordered.

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  • 4 weeks later...

Well, after replacing the crank seals,  piston and rings, I found the real problem.  The oil drain plug was too long and plugged the oil passage causing pressure to push oil through the crank seal. Replaced with a shorter plug and works fine. Next problem, pops out of first gear. There is a bolt next to the neutral indicator with a spring on it. Could a weak spring cause the problem. Anyone know what the spring and bolt is for?

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It's called a detent. The spring and ball work on the selector drum generally so the drum only moves one 'click' at a time. 

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Generally.. No. Once it's in gear the dogs on the gears should hold things. It's when these gears wear that gears pop out. 

Sorry. 

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