no spark on left cylender HELP

[slamed91si]

ok here goes was riding yesterday all day like 5 hrs no problems then hit a big mudd hole and now my bike is only running on one cylender. i had my buddy pull me to try to pop start the bike and the left cylender back fires and the right one is fine i have tested the wires from the coil to the clear plug in the rear and thats all good also tested the coil for cont. and i think thats good. also took the carb and reeds off to look for water and there was none not sure what else to try??? i tryed to get the wires out of the coil and broke the keeper tabs off and still cant get the wires out whats next????????

[278]

did you take the carbs apart and check them?

[bobdryerr]

Have u pulled the plug out an ground it an see if u r gettin spark. Make sure both ends of the plug is good to. I once had a cracked plug that got wet an the plug died.

[dajogejr]

Good chance the coil got wet, remove both spark plug boots and dry them off. Replace them with NGK boots.

[slamed91si]

i have took the carbs off and there fine no water in them. also changed plugs had to pop start and still the same right cylender runs and the left back fires. i dont think the coil can be bad cause it runs on 1 cylender, can it still be bad ?? im thinking its the wire or the boot can you remove the wires?? i dont want to keep pulling on them if they dont come out.

[dajogejr]

remove both spark plug boots and dry them off. Replace them with NGK boots.

 

Coil is probably fine. read above please. The end of the wires that clip on your spark plugs got water in them...possibly.

[slamed91si]

ok will do and ill let you know if that works

[slamed91si]

could you tell me a part# for the boots so i can get the right ones or the gage of the stock wires that might help me thanks

[dajogejr]

LB05F is the part number, or stock number 8051.

I'd bet if you called Jeff @ FAST he'd have them in stock.

 

I think they're around 5 to 8 a piece, but not sure....

[slamed91si]

ok thanks , im going to see if my local napa has them so i dont have to ship them they r closed now but i will go first thing tomorrow

[slamed91si]

ok just replaced the boots with the ones you said, still no spark, looking at the bike from the right side the orange wire goes to the front and the black to the back? whats next the wires? also sanded down the gorund for the coil where it bolts to the frame

Edited September 4, 2009 by slamed91si

[No Limit Powersports]

Switch the wires and plugs from side to side and see if your problem switches sides if does the plug, wire, or cap is bad, if it doesnt you got other problems. Do a compression check on both sides.

[Aitchy]

Switch the wires and plugs from side to side and see if your problem switches sides if does the plug, wire, or cap is bad, if it doesnt you got other problems. Do a compression check on both sides.

 

Im with bansheestang , Check the compression on the suspect side

Just went through this myself, sounds like you have done in a piston

[slamed91si]

im on the way to get a compression tester now. what should the compression be for a motor bored 10 over? i dont understand how no spark can mean i have a bad piston but ill check it anyway thank you all for the help

[quikshee]

i dont understand how no spark can mean i have a bad piston but ill check it anyway thank you all for the help

 

I was wondering the same thing. I am having the same problem but my left side is still sparking, just a weak spark. My right side runs and idles fine, but the left only fires sporadically and when I rev it it runs better.