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Discussion Starter · #1 ·
Ok, here's my problem, my valves are really loud on my bike (700xx of course). I've tried tightening them to spec and it runs much quieter. However if they're even SLIGHTLY under spec at all whatsoever, it takes several cranks to get started and I get this weird hick-up noise every once in a while while running it, so I definitely don't want to run them tight.

If I run them right around what they're supposed to be (or SLIGHTLY loose), they're really loud and annoying, but it runs great. I'm not sure if it's related to the valves or not, but when they're slightly loose, my starter has a hard time turning the engine over (probably on the compression stroke). It can still start it, but you can tell it's having a hard time. I'm pretty dang sure that issue is not the battery, I could be wrong, but I don't believe it is.

I was wondering if the decompression mechanism has anything to do with how your valves are adjusted? Are they super insanely picky on being EXACTLY spot on when being checked? I've adjusted them several times, and like I said, they're either tight and quiet with a hickup, or loose and loud but runs great. Why are the valves so loud on this dang thing? I can hear them over my aftermarket exhaust and although it runs great, I don't want my quad to sound that loud.

Any help would me much appreciated. I'd like to fix the problem ASAP so I can get it off my chest. Thanks.
 

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as far as the starter having a hard time ive got that going on also... maybe someone will chime in on what the problem is... ive asked if anyone has put the cbr1000 battery in and havnt heard anything... im thinking i need more cranking amps... good luck
robby
 

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I have used the CBR1000 battery with the same results. Hard cranking like compression is not being released, not all the time but enough to piss you off.
 

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Discussion Starter · #4 ·
Problem has been fixed!! Guys, check your RIGHT EXHAUST valve clearance. It is EXTREMELY crucial to solving the problem. If too loose it will have high starting compression. If too tight it will loose too much compression. It helps to get a compression gauge and make the compression right around 6590 (maybe 5 or so over to be safe) as ths manual suggests.

Hope that helps!
 

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Discussion Starter · #5 ·
Well, probably hasn't ENTIRELY been fixed yet. I rode it for about an hour and I started getting that weird stuttering again. At least my valve adjustment that I found led to find out that it is a problem with the decompressor though. So later today I think I am just going to remove the whole decompressor itself, I've read that it can still start without it and the top end is quieter without it. Heck, no use having it if it doesn't need it I guess.

Can anyone confirm you don't need the decompressor and can just remove it altogether?
 
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