Total Motorcycle Community Forums

So my bike is only running on two cylinders. WTF?

bike was runnign good up until my holidays. Let it sit for a week and now only "running" on 1 & 2.

Haven't got the plugs out yet but, they are only a month old. As are the carbs "cleaned and synced". First thought would be fouled plugs. But there's got to be a reason why two plugs are fouling after a month. Cause might be carbs are dirty and set up wrong, but I just had them done. Do I need to to lose it on the guys at the shop and have them done again?


What gives? I'm frustrated.

how is your carb setup? 2 carbs feeding 2 cylinders each or 4 carbs? If it is the first setup @ carb) try tapping the float bowl with a screwdriver or taking out the drain to see if you are getting fuel. if you are then check the plugs, after that check the carb and clean it out, I had the same problem on my bike

It's four carbs, I finally took the plugs out and they were all fouled, 3 and 4 were worse than 1 and 2. They are black. Not sure if its fouling from fuel or oil. Didn't look hard enough.

Put in new plugs and it runs fine. Obviously there is still a problem. Something is fouling the plugs fast.

not to be a conspiracy nut, but are you sure they put new plugs in? pull the plugs again after a few miles and see how they are, if they fouled up that fast on you, i would assume they would do so again.

bok wrote:not to be a conspiracy nut, but are you sure they put new plugs in? pull the plugs again after a few miles and see how they are, if they fouled up that fast on you, i would assume they would do so again.

haha yeah, they gave me the old plugs. But were they MY old plugs (puts on tinfoil hat....)

check where your HT leads come from. Usual is 1 and 3, 2 and 4, b ut in this case, you might have one coil supplying 3 and 4, in which case this may be suspect.