New top end Question, PLease help

[Geoff]

Just put a new top end in since I blew a hole in my piston. As far as we could tell previously someone had nicked the base of the cylinder and filled it with sealer and it blew out the sealer and went lean.

 

Well I fired up the bike now and my left cylinder seems great, the right one(the one that went bad) seems like it's missing.....the plug is wet were as the other cylinder is dry. If I hold the throttle steady above idle the left side is nice and steady, the right one seems poppy firing sporadically....more like a 4-stroke.

 

You guys got any ideas? I was planning on going riding tomorrow but maybe not now.

 

thanks Geoff

[Geoff]

come on guys, I know I only posted this about an hour ago but I need to get it running so I can hit the dunes tomorrow. I switched plug wires and still the same deal.

[sheefreak]

Have seen a bad air leak act that way. To much air and doesn't fire all the time if at all. Plug will even be wet as stated. Do you have a leakdown tester? I am assuming you have looked at all the obvious things.

[Geoff]

No leak down tester. I pulled the head off and I had sprung a leak and was getting water in the cylinders. Put all new O-rings in and put the head back on. Runs better but the left side pipe will still get noticably warmer to the touch than the right.

 

When I first put the head on no problems, what could possibly be causing it to keep leaking like this. So much for riding tomorrow, i guess.

 

Thanks

[blueshee03]

No leak down tester. I pulled the head off and I had sprung a leak and was getting water in the cylinders. Put all new O-rings in and put the head back on. Runs better but the left side pipe will still get noticably warmer to the touch than the right.

 

When I first put the head on no problems, what could possibly be causing it to keep leaking like this. So much for riding tomorrow, i guess.

 

Thanks

 

 

how did you fix the base of the cylinder that was knicked?

[Geoff]

It was welded up and decked by Redline Racing.......not shady tree mechanic style,lol.

[blueshee03]

It was welded up and decked by Redline Racing.......not shady tree mechanic style,lol.

 

 

did he deck just the one he welded or did he deck both so they matched up perfectly.

[Satsol67]

you might want to try spraying carb cleaner or something around the gaskets while its running and see if the idle changes being you dont have a leak down tester. just my 2 cents worth.

[Geoff]

well I fired it up again and it's just kinda poppy out that one side were as the other side is firing all the time. Kinda hard to explain hear on the computer. It just isn't right and there are no leaks externally. It feels like there's moisture out that left side still & I don't know what would cause it to keep getting water in that cylinder.

 

Is there a crank seal that might join up with the water pump or thereabouts that could've been damaged by debris when I lost the piston?

 

Thanks guys

[bansheeseat$$]

Pull the head off again and put a strait edge across the cylinders.Measure the gap.It sounds to me like the deck height is way off and the O-ring is allowing coolent to be pulled in.

[Geoff]

Pull the head off again and put a strait edge across the cylinders.Measure the gap.It sounds to me like the deck height is way off and the O-ring is allowing coolent to be pulled in.

Yuh know this same thought crossed my mind last night. What do I got to lose. I think I'll give it a shot and see if thats it, I'll post when I get er figured out.

 

Thanks again

[bansheesmoke]

Yuh know this same thought crossed my mind last night. What do I got to lose. I think I'll give it a shot and see if thats it, I'll post when I get er figured out.

 

Thanks again

 

 

The only few things i could think of is the carbs out of sync and if you forgot to hook the cross over hose that would make the right cylinder run extremely lean and then a airleak.