spark visible in carburettor

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.

[jambo]

Jim Jim,
Could you possibly post some pictures or video of what you mean? Looking into the carb when the bike's running you should never be able to see a spark, as that would probably lead to combustion of fuel in the inlet/carb rather than the combustion chamber.

Jambo

[yorkie_chris]

You can get spitting back, usually when running lean, that looks like a yellow flame popping up.

You need to check that valve timing again, generally putting them back the same way they came out is a good idea. Make sure you're absolutely bang on the F mark when setting and you move all the slack in the chain to the tensioner side when looking at marks.

Cheers folks I've taken a vid I'll have to get it posted asap timing marks as sweet as possible f is bang on the crank. Just struggling to get both lines on front and rear cams on the money inlet cam perfect exaust cam is what would seem to be half a tooth out. I tried restricting air flow when it's running. And problem still there. How do I check lean or rich. Both mixture screw set the Same off closed 3 full turns. Vid will be up soon