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General Category >> Rubber Side Down! >> It just stopped ???
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Message started by badwolf on 11/02/20 at 12:56:07

Title: It just stopped ???
Post by badwolf on 11/02/20 at 12:56:07

Riding along nice and easy, it started making a wisshing noise? About a mile later it just stopped running. Would spin over fine but not fire. I put it in first gear and pushed, I could feel compression, BUT it should NOT turn over that easy. After getting it home (happened 120 miles away), I started tearing it down thinking it was a blown head gasket.
Insted I found this..,

Title: Re: It just stopped ???
Post by badwolf on 11/02/20 at 13:00:33

The inside of the head was beat-up a little, but not too bad,
I'll put it back together with some grade 8 bolts and hope to get another 114 k miles.

Title: Re: It just stopped ???
Post by verslagen1 on 11/02/20 at 13:39:20

I helped somebody local you had that same problem.
They hadn't bent up the tabs on the lock plate.
Hope you don't find the same mess I found when I removed the head.

Title: Re: It just stopped ???
Post by badwolf on 11/02/20 at 17:45:00

Quite a mess for 2 50 cent bolts. Gaskets, oil, & filter and a lot of labor.

I changed the cam chain 34k ago, if I didn't bend the tabs over it lasted a long time.

If there is a bright spot, the cam chain adjuster has not moved since I took out the pawl spring and turned it upside down so the teeth can't catch it 10k ago!

I am sticking with the theory the heat - cool cycles raise hell on the tensioner arm cause of the pawl. When you run out of plunger changing the tensioner arm will make the chain seem almost new.
Hopefully with a plug inside the plunger spring to limit the back travel to 1 or 2mm the pawl won't be needed for kickback.

I know Drag Bike Mike measured that the plunger movment was big time without the pawl, the valves jerking the chain forward and back, but that was static. At rpm I think it would be miminal.

So much to monkey with on a simple bike. But they made it basicly as a throw away bike for beginers. How many of those enginers would have thought some people would run them 100 or even 200 thousand miles!