hey whas up? which mark on the flywheel is tdc. there are two marks. one looks like just a straight line and the one mark looks like the letter H . this is on a raptor 660 2001. also does anyone make a higher compression piston than stock. like a 10:1 . 11:1seems too high . im installing a hot cams stage one and its ported and polished, and i have 32 mm intake valves

 

I have a 10.5:1 and still run pump gas, stage two cam, port and polish LTE duels K&N +4 swing arm, 02 TRANNY in a 01 and I have no complaints

 

both Wiseco and JE make a high comp piston,and it should be the straight line, it should be a T mark for Top Dead Center

 

It's the straight line. The "H" is for timing. I promise

 

Also you must watch the intake valves go down, then as they come back up watch for the "line" to show up that IS TDC. only turn the your ratchet counter clockwise. If you miss the mark you will have to keep going and wait for the intake valves to drop again. Don't back up or you will not be at true TDC. Hope that helps, a book never hurts either

 

Heres a book: http://www.sandwizards.com/Service_Manuals/raptor.pdf