Timing chain skipped, now what?

[JRHemmen]

I didn't tighten it while the bike was operable, that was after when I was trying to figure the thing out. I have the manual, and the instructions Steve just provided are the ones I followed, so I'm not sure why it skipped.

[Steve]

Most of the time when there is a tensioner problem, it is because somebody will read the manual quickly, then skip the last part of #8 and the first part of #9. They will run the setscrew into the plunger and lock it there, instead of backing it off to allow the plunger to move and locking into THAT position.

How much tension is on the spring-loaded knob (the one under the 10mm nut)? There should be a modest amount of tension, enough to make sure that it's doing its job, but not wound too tightly. If there is not enough tension there, the plunger might have been able to back off, but it should have sprung right back into place with its own spring. The knob only applies pressure to the "check valve" mechanism, not the overall cam chain tension.

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[robertbarr]

Our own BWringer constructed a most thorough web page detailing the rebuilding, checking & setting of the tensioner, here: Likely to be very useful, whether or not you need to rebuild it.

[JRHemmen]

Lapped my valves, put them in, set timing, put the chain tensioner in 4 times to make sure I did it right (I followed the instructions exactly), and the bike ran for about 20 seconds before the chain skipped again. Both valves are hitting each other now.

[JRHemmen]

Did a compression test, 150 psi on left cylinder, 0 on right.

[Chancho196]

Are the chain guides complete, and located correctly? Do you turn the engine over by hand a few times before starting it, and then check for tension across the top run of the chain? If it lifts a fair way the chain could be worn out.

Have a look at my post over here regarding my GS550, this might give you an idea on chain condition: http://biketech7.blogspot.com.au/201...or-timing.html

[Chancho196]

So what was the verdict?

[520eek]

Dang....what has happened here? Makes me wonder and feel a loss for your time and effort when you just wanna ride. Hope you can find out what is wrong and resolve it....