CBR 929RR 2000 - 2001 CBR 929RR Forum

Cbr 929 rr overheating

Old Jul 5, 2022 | 09:19 AM
  #21  
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Originally Posted by IDoDirt
Visually it looks like about 0.70 mm or 0.030 in was removed. This would only increase the compression ration from 11.3 to maybe 11.4, so not much of a change. Knowing exactly how much was removed would answer the question about compression ratio.
I am sorry, don't know how much material is removed, mechanic doesn't answer yet,approximately 1mm can be removed max by that dot, so eyeballing it about 0.20-30mm maybe removed i don't know, still that raise of compression is minor, people goes 12-13+ and it runs..
Bike is running, only thing that worries me is the that sound on idle, like piston hits valve, but not always, and then i can hear like gas escaping, just like when turn crankshaft by hand with spark plug in place, i will try to make a video
 
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Old Jul 5, 2022 | 09:34 AM
  #22  
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Piston hitting the valves would be really bad and most likely catastrophic. I would think you would hear that sound continuously and more pronounced at higher RPM's. All the valves are properly adjusted for clearance?
 
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Old Jul 5, 2022 | 11:28 AM
  #23  
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Valves are ok, i check them
 
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Old Jul 5, 2022 | 03:02 PM
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I can't say I've ever seen that much material removed. Nott saying it's not in spec, just never have seen one with that dramatic of a change. The size and shape of the overall combustion chamber is very different (smaller) now. It's going to sound different. Just spit balling here, are the valve springs adequately handling the increased pressure?
 
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Old Jul 5, 2022 | 03:25 PM
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Originally Posted by hamlin6
I can't say I've ever seen that much material removed. Nott saying it's not in spec, just never have seen one with that dramatic of a change. The size and shape of the overall combustion chamber is very different (smaller) now. It's going to sound different. Just spit balling here, are the valve springs adequately handling the increased pressure?
If you look at edge od guiding pins hole, before and after you will see that ain't to much materijal removed as it seems, i will measure compression to se what's the numbers, only thing that's worries me is when engine is hot, its barely cranking, like dead battery, but battery is new, it was doing that same thing with previous head gasket before head was skimmed

 
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Old Jul 8, 2022 | 03:21 AM
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Little update,my htev valve is acting crazy, it seems to be working, and after few kilometers driving i throws up code 34 and 35,i checked with multimeter resistance on potenciometar which should be 5kohms, there is non resistance, and after moving around pins on potenciometar (part on servo where cables goes) a got 5+ kohms, anyway, i stuck open valve, cbr now pull like mad, even changed sound to a more aggressive but, i got this annoying like ball bearing rattle sound on acceleration and especially on deceleration, sound is mixed like valves and ball bearings rattle coming from right side of engine , i have manual cct, maybe chain is the problem?
 
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Old Jul 8, 2022 | 09:13 AM
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Considering how much has been taken apart and reassembled, it's possible that something was overlooked. Could be chain or something else in that area that is lose.
 
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Old Jul 8, 2022 | 09:50 AM
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Originally Posted by IDoDirt
Considering how much has been taken apart and reassembled, it's possible that something was overlooked. Could be chain or something else in that area that is lose.
​​​​​I don't know how much stock auto cct extract with new chain, but mine was fully extracted and chain was loose, so i put manual tensioner and rattle is a lot less noticeable, but still when try to manually rotate crankshaft, chain has little play before rotate exhaust cam, i will order new chain, i hope PROX make good cam chains, can't wait 2 weeks for oem
 
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Old Jul 13, 2022 | 02:29 PM
  #29  
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Okay, 450km test drive is finished, bike runs great,cct was loose, noises came from chain, that's solved now, only this problem now is annoying this idle and up to 3000 rpms, bike jerks, and stalls sometimes by itself on idle, hope you can hear on video

https://youtube.com/shorts/PTDUBoiXNSg
I drives me nuts, fpr is good, no leaking, tomorrow i check for bad ground, because it hapens sometimes when i turn on light bike turns off itself, and crank really slow
 

Last edited by Trifke954; Jul 13, 2022 at 02:36 PM.
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