FZRSupport: the FZROnline Archive

hi guys! Got a 94 fiz. Runs mint but backfires when letting off after high acceleration or high rpm. Also what should the tack be @ whin idling? Thanks so musch for your help!

800-1500 for tach, usually 1100

sounds like your carbs to me, give me some more info, stock pipes, have a jet kit, pods or airbox? How do the plugs look

mine idles well at 1100 . dunno about the backfires tho , you might be running rich .

Dr Rockso wrote:mine idles well at 1100 . dunno about the backfires tho , you might be running rich .

back-firing usually indicates a lean condition I believe.

leak in the exhaust will cause a rush of air into it upon letting off the gas and make backfire-like noises

combustion outside your cylinders......could be any of the problems above but your valves might be outta wack.

tommyj27 wrote:

Dr Rockso wrote:mine idles well at 1100 . dunno about the backfires tho , you might be running rich .

back-firing usually indicates a lean condition I believe.

my bad , i always get em reversed , i'm carbtarded

Before you go adjusting anything (especially since you just got it) make sure you run a full tank of gas thru there and fill up with a fresh 93 octane tank of gas, see if it still happens.

How many miles does it have ?

Welcome to the forum.

thanks everyone-- got er done! goin strong!

Congratulations! How'd you end up fixing it?
Please post it so others with the same problem can benefit

The problem was a leak in the one of the headers. IT WAS A HOLE. I patched it up with some JB WELD for now and Ill put a new system on in the Winter!!! Thanx everyone!