Top end rattle

[Ront]

Hi I posted last weekend about a sudden top end rattle and checked the headpipes-not it-took off valve cover-everything looks allright-I think the cam chain tensioner might not be holding chain tight-looks like carbs will have to come back off to get at it.  Anyone have a experience with the Ape YT1000 manual tensioner? Thanks

[rktmanfj]

If you're hell bent on having one, I have a brand new one...

[FJmonkey]

He he, the FJ is a noisy air cooled beast that keeps going regardless of noise...

[Bminder]

Before you pull the carbs, you might take an allen wrench and make sure the two bolts that hold the tensioner on are tight. Mine were finger-lose.  It's a tight fit but you can get the wrench on them to check.

[movenon]

I would be surprised if it was the cam chain tensioner.  But It worth a check.  Here is a file to read. http://www.fjowners.com/index.php?topic=5620.0
Comes apart easier than it go's back together...  Just been there, done that..
George

[Ront]

Has anyone ever heard of a stock 86 fj1200 cam chain tensioner backing off a little and allowing some slack in the chain causing a rattle? Thanks

[movenon]

Has anyone ever heard of a stock 86 fj1200 cam chain tensioner backing off a little and allowing some slack in the chain causing a rattle? Thanks

If the 12mm main bolt (holding the spring tension) is on tight and the 2 Allen screws holding the whole assembly are on tight then that's it. There is no adjustment. Just spring tension pushing against a piston on to the chain guide.
George

[racerrad8]

No, it is a ratcheting tensioner and would require the ratchet mechanism to strip to loose tension.

Randy - RPM

[rktmanfj]

No, but I do believe you're halfway to the record for starting multiple threads on the same topic...   

[movenon]

here is a picture.
http://www.rpmracingca.com/proddetail.asp?prod=Engine%3ATensioner

[Ront]

I won't post any more posts on my top end rattle because I DO NOT want to break the record(the record holder might get upset)-but I did forget to mention the rattle started after I revved the bike to 8 grand full throttle but I should be able to do that right?

[ribbert]

...... the rattle started after I revved the bike to 8 grand full throttle but I should be able to do that right?

...and a bit more, over and over and over........

Noel

[racerrad8]

I won't post any more posts on my top end rattle because I DO NOT want to break the record(the record holder might get upset)-but I did forget to mention the rattle started after I revved the bike to 8 grand full throttle but I should be able to do that right?

Are you sure it did not spit a valve shim?

Randy. - RPM

[FJmonkey]

Are you sure it did not spit a valve shim?
Randy. - RPM

Does that happen? 

[racerrad8]

Does that happen? 

Yep, just had to repair Poker007's 1100 a couple months back from that exact thing. He too was riding the bike pretty hard when it spit out the shim and broke it into a bunch of little pieces.

If it gets spooled up enough to have valve float, the shim losses contact with the cam lobe. Then when the valve slams shut against the seat, the shim can pop out of the bucket.

Randy - RPM