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#1 |
Junior Member
Join Date: Oct 2015
Posts: 13
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Valve Issue?
Hi All,
I have a 2006 gz250 with 4500 miles that has a metallic tapping noise. I used a mechanic's stethoscope and it seems to be coming from the exhaust valves. I adjusted the valves to spec but the sound is unchanged. Everything else about the bike is great, it has good acceleration, starts up fine, and has a solid idle. I have read through this forum trying other suggestions, even checked the cam chain tensioner. I thought it could be a loose cam chain slapping the engine wall, but no. Is there anything else you guys can think of checking before I try to pull the head and take a peek inside? Thank you in advance! Login or Register to Remove Ads Last edited by gzed; 10-13-2015 at 05:51 PM. |
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#2 |
Senior Member
Join Date: Dec 2006
Location: Squamish B.C Canada
Posts: 11,409
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If the valves are set correctly and you can still hear them a bit that is okay. When you can't hear them they are too tight. Just ride and enjoy a little mechanical music.
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#3 |
Junior Member
Join Date: Oct 2015
Posts: 13
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Thanks Water Warrior. The previous owner didn't tune the bike, and mentioned he often used the choke to keep it idling, never touched the idle screw on the carb.
![]() I got it for a deal, but the sound does not inspire confidence when riding. You don't think this sound could be an early warning of a major issue? I understand gz250's sound like sewing machines, but this has a clear metal on metal plinking each rotation, all temperatures, gears, and acceleration. In short, is there anyways to reduce the noise rather than live with it? I already used a bit of lucas oil stabilizer and this did make the tap a little less distinct. Login or Register to Remove Ads Last edited by gzed; 10-14-2015 at 03:54 PM. |
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#4 | |
Senior Member
Join Date: Dec 2006
Location: Squamish B.C Canada
Posts: 11,409
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Quote:
Just be sure the Lucas oil stabilizer is compatible with a wet clutch. If not you may experience clutch slippage. If you are in doubt about the engine noise seek out some one who knows engines and their noises. Question for you. When you listened with a stethescope you will hear all sorts of frightening sounds. Are you worried about those sounds or just regular sounds with your ears. |
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#6 | |
Junior Member
Join Date: Oct 2015
Posts: 13
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Quote:
Just worried about the sounds with my ears, as most motorcycles I have seen don't have such a clear metal on metal noise from the head. The kind you might hear when a valve is lightly smacking the piston. Appreciate the advice, will keep an eye on it. Last edited by gzed; 10-16-2015 at 12:18 PM. |
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#7 | |
Senior Member
Join Date: Jan 2010
Location: San Fernando Valley, CA
Posts: 135
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Quote:
For the GZ, it was a little slappier after I did the valve adjustment, but nothing that worried me. |
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