Hi everybody.
I need some input from the experienced 2 stroke engine people here....
I have recently put on a killer expansion chamber cut up from a Kawasaki dirt bike. The engine has the most power I've ever had, but a new problem is starting to rear it's ugly head! At high engine speeds (starting around 6000 RPM), the engine will all the sudden loose all power, then it will regain, then loose all power again, over and over. I'm running my new intake which could be a contributing factor, but I'm not sure! Just the other day, I was test driving the bike, and I managed to get lucky, and I didn't get that massive power loss, and the bike kept going and going, I think I must have reached 45 MPH!, and I think it could have gone further. I don't think the bike is too rich, in fact, my spark plug color is grey, and I'm running really rich jets (.042" or 1.07MM)!
I keep going richer and richer, but I'm starting to suspect that I'm simply compensating for another problem. Is it possible that I'm getting an air leak through the crankshaft seals? I will rebuild the engine today and replace those seals, but I have a sneaking suspicion that the problem will still be there! This engine is really turning into a monster since I put this insane expansion chamber on. The other thing I'm thinking is that perhaps the engine is short circuiting because the vacuum from the exhaust is so strong, it sucks the incoming charge right into the exhaust port. The power loss is 100%, like someone putting the brakes on.
Thanks for your consideration.
-Fred
I need some input from the experienced 2 stroke engine people here....
I have recently put on a killer expansion chamber cut up from a Kawasaki dirt bike. The engine has the most power I've ever had, but a new problem is starting to rear it's ugly head! At high engine speeds (starting around 6000 RPM), the engine will all the sudden loose all power, then it will regain, then loose all power again, over and over. I'm running my new intake which could be a contributing factor, but I'm not sure! Just the other day, I was test driving the bike, and I managed to get lucky, and I didn't get that massive power loss, and the bike kept going and going, I think I must have reached 45 MPH!, and I think it could have gone further. I don't think the bike is too rich, in fact, my spark plug color is grey, and I'm running really rich jets (.042" or 1.07MM)!
I keep going richer and richer, but I'm starting to suspect that I'm simply compensating for another problem. Is it possible that I'm getting an air leak through the crankshaft seals? I will rebuild the engine today and replace those seals, but I have a sneaking suspicion that the problem will still be there! This engine is really turning into a monster since I put this insane expansion chamber on. The other thing I'm thinking is that perhaps the engine is short circuiting because the vacuum from the exhaust is so strong, it sucks the incoming charge right into the exhaust port. The power loss is 100%, like someone putting the brakes on.
Thanks for your consideration.
-Fred