brandon rendon
2020-06-15 14:36:29 UTC
so i got this bike and it would start but would not move (tranny was broke) so i got it home and pulled the motor off the bike and found 2 shift forks, a 1/2 of a gear, and lots of teeth in the oil pan... no problem ordered a new tranny gear set and reassembled ran great...
few months down the road, 1 carb started leaking (as old carbs do) and i figured it was nigh time the carbs be rebuilt/new air filter. did all that, did a wet set for the carb floats and at idle its fine, but as im riding it backfires hard and spits a 6"-8" flame out the right side (carb 3 and 4) tail pipe.
that being said, it was backfiring on both sides before i did a carb sync and set the pilot screw (using a colortune) and now they all burn the proper color however... cyl 4 fouls up almost immediately with black dry soot, whilst all the others stay a nice redish brown consistently. at first i thought ok its just a bad plug, i have replaced the plug with 4 different plugs and same result. i figured maybe its the coil (which it shouldn't be as they are brand new dyna coils) so i flipped plug 1 and 4 with each other to see if the foul chased the plug and it did not... i do not have a ton of experience i learn by doing and have only been wrenching on bikes about 2 years... so now i turn to you guys as i have exhausted my knowledge on troubleshooting this issue
oh yea and it has 1.5" straight pipes as the P/O dumped the bike and broke 1 muffler and decided to cut the other muffler off, we lefft the crossover H Pipe on there so i was able to clean that up and weld in some 1.5" exhaust tubing to it until i can find some slips that fit it then i can cut the tubing to the length i need.
oh yea... also i did just shim the valves like 20 miles ago, if that. it has a k&n air stock fit filter (reusable and new) and im using bp7es plugs (factory recommended plug)
few months down the road, 1 carb started leaking (as old carbs do) and i figured it was nigh time the carbs be rebuilt/new air filter. did all that, did a wet set for the carb floats and at idle its fine, but as im riding it backfires hard and spits a 6"-8" flame out the right side (carb 3 and 4) tail pipe.
that being said, it was backfiring on both sides before i did a carb sync and set the pilot screw (using a colortune) and now they all burn the proper color however... cyl 4 fouls up almost immediately with black dry soot, whilst all the others stay a nice redish brown consistently. at first i thought ok its just a bad plug, i have replaced the plug with 4 different plugs and same result. i figured maybe its the coil (which it shouldn't be as they are brand new dyna coils) so i flipped plug 1 and 4 with each other to see if the foul chased the plug and it did not... i do not have a ton of experience i learn by doing and have only been wrenching on bikes about 2 years... so now i turn to you guys as i have exhausted my knowledge on troubleshooting this issue
oh yea and it has 1.5" straight pipes as the P/O dumped the bike and broke 1 muffler and decided to cut the other muffler off, we lefft the crossover H Pipe on there so i was able to clean that up and weld in some 1.5" exhaust tubing to it until i can find some slips that fit it then i can cut the tubing to the length i need.
oh yea... also i did just shim the valves like 20 miles ago, if that. it has a k&n air stock fit filter (reusable and new) and im using bp7es plugs (factory recommended plug)