Hi im new to the forum. hopefully someone can help. starting from the top, I bought a 2000 wr400 and had it for 3 days. 1st day it ran perfect and never skipped a beat, second day no issues just putts around the yard a bit. day 3 it started running crappy, loosing a lot of compression quickly in a few hrs of riding till I could "kick" it over by hand without the decomp lever pulled. since then...
carb rebuilt by Yamaha dealer
new spark plug
top end gaskets
cyclinder re-bored by us chrome (to new piston)
and I think that's it so far. at this point I still cant get it to fire. ive triple checked the timing( tdc with the I showing and lining the E's horizontal to the head facing left), theres enough compression I can stand on the kick start at tdc, checked spark twice and its nice and blue. when I took the spark plug out both times the plug was damp with gas and the bowl seems to have plenty coming into it. im pulling my hair out with this one! anyone have an idea about whats going on?