I have a 1997 ZX6R Ninja was missing and losing power. Cleaned Carbs, New Plugs, New Air filter, New fuel Pump, Cleaned Tank, New filter on tank as well as new fuel filter. Still Faulty

s_pra_army

• 37 Answers
• Posted on May 10, 2009

SOURCE: engine bk firering & lose of compression.

Backfiring after warming up can be from many things.

One that comes to mind is carbon deposits on valves, causing them to not close properly. The carbon deposits would also heat up and then ignite air/fuel mixtures before the spark plug can fire.
Or you would have hot exhaust gasses leaking back into the cylinder on intake and that would ignite the fuel.

Tac gauge fluctuating, and engine running rough on acceleration could be a vacuum leak, do you hear a hissing sound when the engine is running? listen closely under the hood. If you have a vacuum leak you would lose power and your RPM would fluctuate oddly. As for the backfire however, there are probably more than just one problem. Its hard to say for sure.

So please, more details, noises you hear, when exactly everything happens etc.
What speed and RPM the engine begins to bog down at, does it stall? What range is ur tac fluctuating at? anything you can think of, throw it on there.

Hope this helps you

SOURCE: 87 Aspencade 1200 backfires between shifts and

check for leaks around the exhaust headers,mine did what yours is doing,i replaced the copper exhaust seals in the head(exhaust ports),air is getting into your exhaust system and it mixes with the unburnt fuel and ignites causing the backfire,i replaced copper seals(about $2nz each) and problem went away

SOURCE: 91 Jeep wrangler New everything idles rough, no Power then dies

you check for miss how is compression

SOURCE: cleaned the carbs, changed the plugs gapped at 34

I would be checking for air leaks, this will give you a lean mixture. In particular look for the seals for the balance tubes and each carb.

Testimonial: "Balance tubes you were on the money thanx"

SOURCE: Fuel leaking from air box after shutting down

Hi
Thats the float valve seals not shutting off, did you clean them & set the float heights?
The overflows from the carb bottoms must also be blocked for the fuel to fill up the carbs which then leaks into the air filter
Check also that the fuel tap turns off when bike is not running

Ride Safe
Bike-Doc