Maintenance & Technical > KX500 Original

exhaust valves

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no sub for cubes:
thanks for the reply toby,you might be right,what appears to be a short tooth is where the spline is broken on the gear,both are broken the one is worse than the other,but you might be right originally it might of just been a little shorter that the rest and has become more damaged over time,it is coincidence that they have both damaged in the same postion(same tooth). so your theory might be right,there are no other markings on the valves i can see.
If i put it together and it is wrong is there any possibility it would damage anything,or will it just not run good?someone suggested if they are assembled wrong it can cause back preassure  :? :|..

cbxracer30:
I think a newer style cylinder will work on your motor but you would have to drill the cases for the idler gear pin not 100% sure but just think it may work and I just got off the phone with my buddy who had an 88 and he said he was going to make that upgrade but never did. CBX

no sub for cubes:
thanks for the info cbx,i spoke with a guy who said the same thing need to drill the case,called a guy and hed just sold the last pair he had gutted! :x...shame cos i have the chance to buy another 88 cylinder for 100 pounds just need replating,i might buy it anyways,stick my valves back in for now and put it back to together with my old sleeved cylinder,and keep searching for new valves,when(if) i find some, get the new cylinder plated and do the job properly.

again great sight and thankyou everybody for useful info  :wink:

dave916:
HI THERE,   i think you should be able to look in exhaust port to line up valves without any marks, when the control rod is in full both valves should be closed [or silghty over closed if ball bearing mod not done] when rod is pulled out the should open ports in cylinder / i am going to be working on a 88 engine next tuesday so i can post pictures of the timing marks etc if you can wait till then

no sub for cubes:
hi dave916,thanx for the reply,we have concluded that the 88 powervalves dont have the dot on the cog as timing marks,but do have one spline on the gear shorter than the rest,originally i was under the impression this dot had been worn off or i had the wrong valves in my cylinder,any how thanks to these guys i now have identified this shorter spline although they are quite severely damaged,so im able to time it back up,i was toying with the idea of putting al later jug on it because 88 valves are now discontinued and sourcing them seems to be near impossible,but like cbx informed me you need to drill out the crankcase on mine to fit a later cylinder so for now i`ll just stick me old worn valves back in and keep looking so if i can drop on some new old stock unless.......that engine your working on next week you just happened to notice it had no exhaust valve in it  :roll: and posted them to me  :evil:

 cheers everybody for their input,i will breath life into this k5 again if its the last thing i do  :-D

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