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850 max rpm

  • Thread starter Thread starter gs850cafe
  • Start date Start date
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gs850cafe

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well most of you know im rebuilding my spare low mileage 850 engine...all new gaskets rings etc etc..

my current engine on the bike is plum worn out...it leaks everywhere, smokes to high hell, makes strange sounds...but shes a trooper...i still run it hard and ride it daily...

well i was told by another memeber the 850 will run out of breath before it hurts itself...

so curiousty got me...i have the 92 gsxr gauges...i seen 11k out of first gear when i looked down...then i did a netrual rev at 13k....later that night i ran it at 120mph in the backroads for about 2 or 3 miles

im amazed at the 850 once again...by far the best damn bike ive owned...well the only bike....

yes it may have been abusive...but again its worn out...why not have fun when you have almost 2 of each part in your garage
 
Someone here posted an article describing what Yoshimura did to the GS1000 superbike engine. That's basically the same top end you have, minus the idler between the cams. The key enhancements related to high rpm were to change to a lighter shim under bucket arrangement and add an extra idler for the cam chain between the tensioner and intake cam.

The stock engine when over revved tended to spit shims out of the buckets and/or break cam chains. I don't know what the chances of these things happening are, but they were enough of a problem in the duration of a superbike racing season to necessitate the changes.

I'm guilty of a few excursions well past the red line myself, but the tach is marked as it is for a reason. If you continue to rev that thing, be prepared to destroy an engine. Or, you could continue beating your current beater engine and let us know how long it lasts.
 
Dogma said:
Someone here posted an article describing what Yoshimura did to the GS1000 superbike engine. That's basically the same top end you have, minus the idler between the cams. The key enhancements related to high rpm were to change to a lighter shim under bucket arrangement and add an extra idler for the cam chain between the tensioner and intake cam.

The stock engine when over revved tended to spit shims out of the buckets and/or break cam chains. I don't know what the chances of these things happening are, but they were enough of a problem in the duration of a superbike racing season to necessitate the changes.

I'm guilty of a few excursions well past the red line myself, but the tach is marked as it is for a reason. If you continue to rev that thing, be prepared to destroy an engine. Or, you could continue beating your current beater engine and let us know how long it lasts.
Click to expand...

I read somewhere that some of the early 1000 Superbikes used the idler from the 750/850. I don't know if they did it all the time or not.
 
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