I got a center mount, 66/80CC ( from BGF), slant head, RT high performance carburetor (from Dax), expansion pipe ( from SBP), single bottle boost.
Problem--won't start. It tries to start but heavily bogs down and then dies at low throttle and immediately backfires and dies at high throttle. I adjusted the carburetor leaner but it didn't solve the problem.
The bike was running good until the CDI wire that goes to the spark plug vibrated loose and started arcing across to the cap which melted the plastic on the spark plug cap and the thing started backfiring and then died. It hasn't started since. I replaced the spark plug and the CDI but no change.
Note: Before this happened I had a problem with a head/cylinder stud that broke. I put lock nuts on the head studs and when I tightened one of them down the stud broke (the threads were really poorly made). I replaced the stud with another one from an old engine and used lock-tight but the head gasket has trouble fitting over the studs, it just doesn't line up perfect anymore. It's very difficult to get a the head gasket on over the studs without bending it. I think I have to drill out one of the stud holes on the gasket just a little bit to get it to go on straight. Could my problem be an air leak from the head gasket? Would an air leak cause backfires? I could try to replace the RT carburetor with the stock NT carburetor, is that a good idea? Do I need a new engine?
Any help is much appreciated!
Problem--won't start. It tries to start but heavily bogs down and then dies at low throttle and immediately backfires and dies at high throttle. I adjusted the carburetor leaner but it didn't solve the problem.
The bike was running good until the CDI wire that goes to the spark plug vibrated loose and started arcing across to the cap which melted the plastic on the spark plug cap and the thing started backfiring and then died. It hasn't started since. I replaced the spark plug and the CDI but no change.
Note: Before this happened I had a problem with a head/cylinder stud that broke. I put lock nuts on the head studs and when I tightened one of them down the stud broke (the threads were really poorly made). I replaced the stud with another one from an old engine and used lock-tight but the head gasket has trouble fitting over the studs, it just doesn't line up perfect anymore. It's very difficult to get a the head gasket on over the studs without bending it. I think I have to drill out one of the stud holes on the gasket just a little bit to get it to go on straight. Could my problem be an air leak from the head gasket? Would an air leak cause backfires? I could try to replace the RT carburetor with the stock NT carburetor, is that a good idea? Do I need a new engine?
Any help is much appreciated!