I finally finished the top end rebuild on my kodiak, everything seemed to go well and it started up and ran. When I went to drive it around it seemed to have good power and ran ok but there was a little pop/spit coming from the exhaust. Kinda like the valves weren't right or the timing chain was off a tooth. Well I checked this and that, new plug, rechecked valve lash and all seemed fine. Well today I drove it around with it still popping, so I stopped and figure Id raise the needle up a notch to see if that would help it. I went to start it and it didn't start, so I put the needle back where it was and still wouldn't start.

Now if you put your hand over the airbox hole with the filter out its just blowing air out and not sucking when you turn it over.

I'm guessing it jumped time?

What do you guys think?



Thanks much! Turbo

 

Take the plug out and see if it is sparking, do a compression test at the same time, you could just have fouled the plug with too much fuel, cams are fairly wild on quads and they spit back through the intake when right. Check cam timing again, it's not that big a job, and check the chain is tight, if it isn't, you have a problem.

 

The plug is sparking, and the rings/piston are brand new and just broke them in with a new bored .40 cylinder and crosshatch honed. Plug looks fine. I'm still thinking its the timing off a tooth or it jumped a tooth considering how it doesn't pull/suck air from the airbox, it just blows it out. And since It's doing that, It doesn't have no way to get the fuel to the cylinder.

 

Well moved the timing back one tooth and it ran fine for awhile, but now I've started getting the little sputts out the exhaust kinda like the valves got out of adjustment again. Not sure if the pop would happen if the valves were too tight but I'm thinking maybe it would.