Backfiring Issues

I had the same problem with backfiring out of the carbs and do you know what the solution was? After 6 freaking months, I found that it was the vaccume line from the petcock had come off the nipple and thus creating the backfire through the carbs.

Once I installed the vaccume line that bike ran like a million dollars.

Moral of the story, check the little stuff first before tearing the valve cover off. A lot of times it is something simple that you have overlooked.

Did you check to see if the vaccume line has any cracks, tears, or holes.

For $2.00 all of your troubles may go away.

KRB)

KOOL RYDER wrote:

I had the same problem with backfiring out of the carbs and do you know what the solution was? After 6 freaking months, I found that it was the vaccume line from the petcock had come off the nipple and thus creating the backfire through the carbs.

Once I installed the vaccume line that bike ran like a million dollars.

Moral of the story, check the little stuff first before tearing the valve cover off. A lot of times it is something simple that you have overlooked.

Did you check to see if the vaccume line has any cracks, tears, or holes.

For $2.00 all of your troubles may go away.

KRB)

got the new tires on it today. after a months worth of hard labor. i took it for its first ride. pure bliss :woohoo:

uh... yeah... that vacuum line was missing... forgot to put that back on. doh

that fixed most of the issue. it just pops a little bit. i still have to check the timing/carbs/valves.

THANKS FOR ALL THE HELP GUYS

I wonder if thats whats wrong with mine. It only does it when I first start it until it gets a little warmed up then it stops. I'm gonna go check for cracks right now.
Thanks

i'm having the same problem my timing is right valves are in spec so i just walked out to check the vaccume line and i don't have one on my petcock

If idle circuit/pilots are adjusted too lean, causes similar in my CR Specials....

When was the last time this KZ was tuned up....
Plugs, valve clearances, ignition timing, battery charged, carbs synced etc....

Hi KZ, Mine did the same thing as yours. My problem was dirt or rust in the carbs and the wrong pilots and main jets in them. If you have stock exhaust pipes and the stock air filter box, all you need is a good cleaning. It may be a little overwhelming, but it was for me also. It got easier after I got into them. Get a good manual and take your time,you can do it.Make sure you have a fuel filter in line after cleaning the carbs. Z1 Enterprises has all the parts you would need. A metric set of O-ring from Harbor Freight will help also. I had to put larger pilots and mains in mine, since I have a 4into 1 exhaust and pod filters. Good luck. Bob

new plugs , points and condenser, carbs synced, timing set, and valves checked about 3 weeks ago and its doing the same as kzyoungbloods bike

Always been told if it backfires through carbs, ignition is advanced and if backfires out pipe, ignition timing is retarded. Anyone else heard this?

racer54 wrote:

Always been told if it backfires through carbs, ignition is advanced and if backfires out pipe, ignition timing is retarded. Anyone else heard this?

...and if it backfire out both, the owner is retarded.

:silly:

Skyman... :laugh: :laugh: :laugh: :laugh: :laugh: :laugh: