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Hi, new heare. I own a trx400 and I notice a ticking or lets said knoking sound, and somoke from ehaust and thats happend from setting in idle to WOT. Yes I know that Ineed to rebuild but I will like to know what is the recomended compression for a 2001 trx400 ex, before I start the rebuild process. I will apricciate All the info or comments on this. Thank's to all and keep having funn while it last.
 

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Your valves could be way out of spec. That could cause all of your issues, try that before a rebuild.

Welcome to the site
 
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