4k - backfiring HELP

[1goodidea]

Well it's more of a constand pop pop pop pop pop whenever your not accelerating except for at idle.

Not just when you decelerating say when comming up to a giveway but even changing up/down gears.


What could it be? I have gaped plugs,and points got new rotor and dizzy cap, adjusted timing, set idle, adjusted air/fuel mixture as best i can all seems fine.

any ideas?

Standard exhaust

[pervert]

An exhaust leak could cause that...

[1goodidea]

oh k, it has a leak but i can't see how it could affect it.

It's right at the end of the rear muffler where the muffler meets the exit pipe! it's been like that for about 5 months tho, not prior problems

[pervert]

Hmmm, I doubt a leak there would cause it, it would usually have to be a lot further up around the flange/flexi sort of area.

Mine makes the same noise when not accelerating, but thats because of the exhaust on it, it didn't use to do it with the standard system.

[LEV_101]

could your spark plug leads be a problem. how old are they?

[1goodidea]

yeh they are pretty old, going to replace them next.

I don't think they are the problem though as it seems to be getting perfect spark

[scope]

when my ke30 had a 3k in it it did this backfiring and even the 4k does it. as pervert said it might be cause of non-standard exhausts though?

[TygerTung]

It's all part of K series syndrome

[pervert]

Yeah, when I had the standard exhaust (with a hole in the mid section) it made the same noises, then when I went to a free flow with extractors it got even worse, but it now sounds pretty cool, rather than tinny.

When I put the new carb on it quietened it down heaps.

[Muzzie]

Exhaust probably.

I have a straight pipe off the manifold of mine and it backfires and burps flames all day long, never did with the original.