ok...i'll just start from the beginning.(this is kinda hard to explain i think, but i'll try) ok well my friend was out at Dunebuggy flats halloween and fried his clutch. when he got it home he noticed that the tranny oil was leaking out of the front of the case. so he pulled the engine and split the case. as he is putting it back together he stops and tries to shift threw the gears. it only shifts 3 times up and down. he doesnt have the top end on or the case together.(i dont think) he just set the gears in and everything and tried it and thats what happenes. is that normal? does it need to be put all back together until it will shift threw all the gears? if you dont get how it is in there maybe i can get over to his house and take some pics. i told him to fix it by selling it and buying a 4 stroke, like the turboed DS800 on ebay!



Steven



sorry for the double post

oh, also he has some detonation. he had it bored about 40 over.(went threw a top end because of detonation) when he got that done we found out that the domes were shaved. so his bike is bored about 40 over, shaved domes, aftermarket ignition w/ stock timing, and T-5's, i think thats it. so with that stuff done do any of you have any clue why he's getting detonation? he is running 101 with i think 24:1 Yamalube. i told him that maybe he needs to run 110 octane instead of 101. but he thinks he doesnt because he isnt running a really high compression. thanks guys



Steven

Way to much oil leaning out his mixture. Have him go up to 40:1 ratio to get some gas back in the main jets.

to much oil might be the exact problem if you can find out how much compression it had, i had a friend running pump gas 93 with 175psi in his banshee and it was fine

Really? I find that really, really hard to believe. Your friend needs a new compression gauge I think.



Anyways back to the question. You might have to wiggle the clutch and hold the countershaft to get the transmission to shift thru all 6 gears. Just spinning the clutch shaft doesn't always allow you to shift thru all the gears. I would run a leaner oil mixture in the premix and do a plug check when he gets it back together. Chances are a lean main jet caused the as you call "detonation". Probably was a lean pop not detonation. Did he melt both pistons before he rebuilt it? Right from the center out the exhaust port?

I just noticed something in the first post. You said he had oil out of the front of the case? Did he split the cases when he rebuilt it? That wasn't tranny fluid out the front, that was premix either from the case halves or the cylinder base gaskets. Your friend might of had a air leak in the bottom end. Air leak causes the engine to run way lean and melt pistons. You have to seal the bottom end really well. When he puts it back together make sure he replaces the main seals too.

Really? I find that really, really hard to believe. Your friend needs a new compression gauge I think.



Anyways back to the question. You might have to wiggle the clutch and hold the countershaft to get the transmission to shift thru all 6 gears. Just spinning the clutch shaft doesn't always allow you to shift thru all the gears. I would run a leaner oil mixture in the premix and do a plug check when he gets it back together. Chances are a lean main jet caused the as you call "detonation". Probably was a lean pop not detonation. Did he melt both pistons before he rebuilt it? Right from the center out the exhaust port?
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when he went through a top end it was i think the right cylinder that had detonation. it ate up the piston really good. if he can find it i will post a pic of it. i will take a pic of the bad piston.




i never saw where it leaked from exactly but yes it leaked from the front of the case. i think he split the case. so if it wasnt tranny fluid leaking how did the clutch burn up? i dont think there was any fluid in it after he rode for a day. and you guys know how a leak shows up at the dunes. that was the only part that had sand all stuck to it. he saw no other leaks.

so does it not matter that he is running 101? or should he switch to 110 after we fix it?
THANKS!!


Steven

This is hard to really say. So many varibles to tell. If it was the fuel or timing both sides should be affected the same way. Usually air leak or plugged pilot will just be on one side. How did it run? Did it miss? If it did when did it miss? At idle? Top end? Thru the middle?

The whole leak thing is that only about 1 1/2 inches of the front of the case are sealing tranny fluid in the transmission in front of the water pump. Without seeing the leak hard to say where all the fluid went.

it runs great, except at idle. here's a link to an idle problem it has. we still havent figured it completely out.


Steven

one more question. since he took the whole engine apart pretty much, does he have to brake it in again? the pistons were out of the cylinders so, doesnt that mean you need to break it in again?



Steven
oh, we figured out the tranny!

If he replaced the pistons and rings, then he needs to break it in. If he is putting things back together using all the old parts (He needs new seals and gaskets), he won't have to put things back together, Make sure the old right piston goes back in the right cylinder and vice versa.