jimjim

hi all, I have a 2000 sv 650 s with a wrp lite serries end can. when i was fitting a dyno jet kit to the carburettor, on completion i noticed a spark in the carburettor. so i checked the work i had done all seemed ok i then checked the valve clearances. theese where out of spec so i took out the cams reshimmed them, and got the correct clearances between the cam and valves . spent an age retimming the engine (is it possible for all marks to line up exactly or do i need a new chain i tried all directions back foward 1 tooth. had to settle with the best i could get) built it up fired it and im back to square one however the engine now takes the throttle more smoothly. but i still get this sparking on the front cylinder where do i go now. feeling a bit lost . could it be a bent valve cracked or loose valve guide. would really appreciate some feed back.