7 replies to this topic
  • wrx_stud56

Posted July 17, 2004 - 07:11 AM


Hey guys, today i when i was riding, i noticed that the valvetrain on the 450 sounded a little loud, i mean you could hear it loud and clear ... i didnt notice it before until a friend of mine pointed it out ... are your bikes like this ? if not, then i guess i should check the valveclearances and all that stuff early .. ive only ridden the bike for about 30 hrs at the max so ..

  • cbff33YZ426

Posted July 17, 2004 - 07:39 AM


You can get it checked out, but the big thing to remember is you can put 10 identical yamaha thumpers next to each other, and each one will have a different sound coming from the engine. It should only cost around 100 bucks to get your valves checked out. Less if you are lucky.

  • ryno717

Posted July 17, 2004 - 10:06 AM


100$!!!! Save your money and check the valves yourself. I doubt you have problems with your valves, I'm on my 3rd yamaha four stroke, '00 wr 400, '02 yz250f, and now '04 yz450f and I have never had to adjust valves. If you are running a lighter oil you can get more engine noise than running a heavier oil. Summer time I run 20-40. Just a suggestion.

  • DoctorRzed

Posted July 17, 2004 - 10:40 AM


All bikes make noise listen to another bike. I believe the clutch makes noise and the valves also do. I really wouldn't worry bout it.

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  • bushy

Posted July 17, 2004 - 10:42 AM


Mines also loud and clear, and it has a new cam chain and the valves were in spec, nothing looked wrong when we opened it up. Still runs like a raped ape.

  • wrx_stud56

Posted July 17, 2004 - 01:16 PM


yah, i just dont wanna screw this bike up, and i agree, checkin it myself would be the way to go if i were to check it, im just makin sure this is how the bike runs ya know ..
thanks for all the advice

  • ovrrdrive

Posted July 17, 2004 - 05:38 PM


Is the noise any different when sitting still with the bike in gear and clutch pulled as opposed to sitting still in neutral and clutch out?

I hear alot more noise in neutral on mine...

  • del_scorcho

Posted July 17, 2004 - 07:34 PM


All bikes make noise listen to another bike. I believe the clutch makes noise and the valves also do. I really wouldn't worry bout it.

I agree. At first I thought that my valves needed to be adjusted. I later found out that other YZF's and even CRF's had the same valvetrain noise. Shouldn't be anything to worry about.

Regarding checking valve clearance, I need to learn to do that myself.

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