Why would my bike only be firing on the rear cylinder I'm getting spark to both plugs.

SOURCE: HD 1200 Sportster 1997 model misfiring on rear cylinder

hi paul here,
the coil on my bike turned out to be the problem after checking wires, connections and plugs. brought a used single fire. tried it out after being told that coils usaully go all bad not just half. have not had the problem since and i was conteplating buying ignition and coil combo for hundreds. good luck

SOURCE: misfire forward cylinder

First you'll need to get a jet kit from West coast star. Then you'll need to jet the carbs to run equally. This may take some trial and error. Another thing that worked on my bike was the upgraded coil kit they sell. It's almost double the voltage of the stock coils and comes with better insulated wires for a more uniform resistance. I haven't had this problem since. It'll make the cylinders fire evenly and save you from those pestiferous fouled plugs. I hope this helps.

SOURCE: Rear cylinder not firing

95 Evo, new plugs, new wires, started backfireing like a machine gun, front cyl. no spark at plug sometimes - would this be the coil, have not ohmed the coil yet . Thanks

SOURCE: firing on rear cylinder not front

I had a similar problem with my Hinda Cb750 after it sat for years. What i had to do was work my way from the battery thru the electrical system cleaning all the connections along the way to the coils This fixed the problem and get me firing on all cylinders. give it a try

SOURCE: suzuki intruder 1998 rear cylnder spark plug

hi your carbs need rebuilt if you bought the bike with the cobra pipes on it an aftermarket jet kit has already been installed after time the aftermarket needles wear out and or wear out the emulsion tubes. i had the exact problem tried every thing coils, igniter box etc. check out GMAN INDUSTRIES. COM they will solve your problem. or sell you genuine mikuni parts with the correct jets, pilot screws, and needles.