rhinoevans
Active Member
Still Baffeled
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If some of you remember an earlier post on my 2002 Pitbul. Very poor DYNO (70 HP) and a very small main jet (62) to get the right a/f ratio. Started some troubleshooting.
1. Sent carb to xXx and had a complete upgrade kit and Bob checked it out and said the carb was good, except for some valve blowby on the carb. He did fix a cracked a/f mixture screw problem. Obviously someone had over tightened it. When I got the bike it had a 70 main and was still running RICH.
2. Compression and leak down on the motor last week. All numbers good. I was convinced it was a valve problem despite the fact that the bike run great cept for the loss of 20-30 ponies.
3. Installing a 600 as we speak (at the dealer). Should know more later on that. My mechanic thinks it all about the cam, so that is why we went for the 600. However, I still find it hard to believe that what ever cam is in the bike will call for a 62 main jet. I also think that the small main explains the loss of HP.
4. Pull the V&H exhaust. All looked good. Did look black and sooty from the rich condition.
5. Bike runs good, so timmng is OK.
PART TWO: Pulled the cam to put in the 600. Guess what we found. It already had a 600!!!!!! Pulling the pipes tomorrow and dyno with different pipes. Only thing left to check.
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If some of you remember an earlier post on my 2002 Pitbul. Very poor DYNO (70 HP) and a very small main jet (62) to get the right a/f ratio. Started some troubleshooting.
1. Sent carb to xXx and had a complete upgrade kit and Bob checked it out and said the carb was good, except for some valve blowby on the carb. He did fix a cracked a/f mixture screw problem. Obviously someone had over tightened it. When I got the bike it had a 70 main and was still running RICH.
2. Compression and leak down on the motor last week. All numbers good. I was convinced it was a valve problem despite the fact that the bike run great cept for the loss of 20-30 ponies.
3. Installing a 600 as we speak (at the dealer). Should know more later on that. My mechanic thinks it all about the cam, so that is why we went for the 600. However, I still find it hard to believe that what ever cam is in the bike will call for a 62 main jet. I also think that the small main explains the loss of HP.
4. Pull the V&H exhaust. All looked good. Did look black and sooty from the rich condition.
5. Bike runs good, so timmng is OK.
PART TWO: Pulled the cam to put in the 600. Guess what we found. It already had a 600!!!!!! Pulling the pipes tomorrow and dyno with different pipes. Only thing left to check.
