One thing overlooked in this link (and in the manual):
They both state that if a feeler gauge won't fit in the intake valves, you are on the wrong stroke and should turn the crankshaft one more turn. This is correct, as long as the valves have not worn tight, which is common with the Raptor. In some cases the intake valves have worn so tight that there is NO clearance, and the bike has begun to lose compression when cold - making it hard to start when cold.
Instead of using this method to determine TDC compression, I watch the exhaust valves until they are nearly closed and at the same time the intake valves until they JUST start to open - you should see (or just have seen) the I in the inspection window. I then turn a full turn until the I comes up again, and there's been no valve motion for the last half turn (Willy likes to rock the crankshaft back and forth at this point to verify there's no valve motion).
This guarantees that you are at TDC compression stroke - the proper place to adjust valves.
'01 660 Raptor, Burgard +2+1 arms, YFZ Shocks, LSR anti-vibe, CTR pipe, jetted, K&N
'01 Polaris Scrambler 400, K&N
'02 Honda 400ex, Big Gun pipe, jetted, K&N, Lonestar +2 A-arms, Lonestar anti-vibe
'04 Suzuki LTZ400
'16 RZR XP4 1000 Turbo
Last edited by QuadManiac; 02-25-2010 at 12:48 AM.