Won't kick over or push start? Please help!

[Lisa113]

So I tried to race my first ever race 2 weekends ago I went one lap around in practice and my bike stopped. It would not kick it froze. So my boyfriend took my bike all apart to find the one of the Valve Lifters broken and the side of Camshaft holder. So this is what he replaced Valve Lifter, Camshaft holder, Cylinder head gasket, Cylinder Gasket and Radial Ball Bearing. He also changed the shims last night seeing we still can't figure out what is wrong with this bike. Also the cam chain is lined up like the book shows. So once all put back together it will not kick or push start its like it wants to go but won't go we are getting a spark and changed the spark plug as well. He want's to burn it please help (Prior to all this the bike started but didn't really like when I put it in gear I would have to give it gas or it would stall out. I would always have to hot start it once it had been running for a little while.) I'm new to this so if i didn't give you good information please ask! Thanks

[socalxr]

Redo the valve clearence. What size pilot and leak jet are you running? Also, try increment adjustments on the fuel mixture screw. Clean air filter?

[TWOWHEELTOM]

After checking the easy stuff like socal said, then make sure your valve timing is correct. It is very easy to be off by a tooth. Sometimes it will run being a tooth off but will run like crap, especially at idle and wide open

[socalxr]

After checking the easy stuff like socal said, then make sure your valve timing is correct. It is very easy to be off by a tooth. Sometimes it will run being a tooth off but will run like crap, especially at idle and wide open

I found out about that first hand. Definitely check that as well.

[adamdeluca]

Do you have access to a timing light? The easiest way to check the timing.

Adam

[flyingcouch]

I bet the cam shaft gear turned on the cam when the lifter came apart. I just bought a bike that was run without oil. One of the lifters seized up and the gear on the cam spun. The timing was off by 45 degrees. Have to buy and new camshaft.

[Lisa113]

we replaced the piston and the valves are hitting the brand new piston it shows wear and it has never started we did try to tow it with a truck to get it to start

[capt justin]

we replaced the piston and the valves are hitting the brand new piston it shows wear and it has never started we did try to tow it with a truck to get it to start

def timing is off

[hurky4]

def timing is off

ya defenitely the timing is off that happened to car that i rebuild because the valves were open when the piston came up because the timing was off. how it got is because there was a timing chain tensioner that broke and it loosened the chain which cause this. definitely redo the timing

[TWOWHEELTOM]

if the valve hit the piston hard enough to make a mark or dent the top of the piston, you need to make sure the valves are not bent. sometimes being off by one tooth will let the bike still run....in your case, if the motor actually started you probably would of caused a lot more damage. If you cant get it to kick start, DO NOT force the bike into starting by dragging it behind a car. Its telling you theres another problem. Sounds like you hopefully got away with one here! Fix that thing and throw down some hot laps!

Tom

[Racerboi023]

You towed it with the truck with the valves hitting the pistons?

This is not good you may have just bent the valves. somthings got to give when the crank turns.

Look for someone close that can replace your valves in your cylinderhead and get your engine straitened out. Look on local racing series web-sites, look

thru the sponsers. These shops will treat you good.

Sounds like your carbeurator has cloged jets, if it ran before its prob jetted correctly just needs help.

A valve only needs to bend a very small amount to leak combustion back toward your airfilter that might get ugly.

Edited November 11, 2010 by Racerboi023

[stanfillmc]

My son's 150rb seized last week. Just took it apart yesterday and the cam sprocket spun about 15 to 20 degrees. Enough to make the exhaust valves hit the piston.