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<blockquote data-quote="Lachlan" data-source="post: 231121" data-attributes="member: 5775">Hell i desperately need help, I am going riding in 2 days and i have this terrible noise coming from my YZ250F especially when i rev it (sound like a high pitched whining noise, not like the good old deep rumble of a 250f) it sounds like its from the timing chain area. I have checked the chain tension and it is adjusted fine. Compression is okkayyy but a bit low. However the most concerning is the bike won't really idle. When i first got it i would start it and it would idle for 1 minute then stall by itself. Since then i have adjusted the Air/fuel mixture and it has helped a bit but still not great. I suspect something to do with the vales but i don't know how to do that. I just really want to get rid of the noise its very annoying and scary. Am i panicking or is this normal ??&nbsp; 1. Weird ticking, hitting or pinging noise 2. Compression is a bit low 3. Bike struggles to idle without stalling. Any information will help. thankyou</blockquote>

[QUOTE="Lachlan, post: 231121, member: 5775"] Hell i desperately need help, I am going riding in 2 days and i have this terrible noise coming from my YZ250F especially when i rev it (sound like a high pitched whining noise, not like the good old deep rumble of a 250f) it sounds like its from the timing chain area. I have checked the chain tension and it is adjusted fine. Compression is okkayyy but a bit low. However the most concerning is the bike won't really idle. When i first got it i would start it and it would idle for 1 minute then stall by itself. Since then i have adjusted the Air/fuel mixture and it has helped a bit but still not great. I suspect something to do with the vales but i don't know how to do that. I just really want to get rid of the noise its very annoying and scary. Am i panicking or is this normal ?? 1. Weird ticking, hitting or pinging noise 2. Compression is a bit low 3. Bike struggles to idle without stalling. Any information will help. thankyou [/QUOTE]

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