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.