I have an 1988 ninja that is firing on all four cylinders but is blowing fire out of the back of the carburetor. What could it be?

Sitting on the bike, the LEFT end is Cylinder number One and the RIGHT end is number Four. The Firing Order is 1,2,4,3. The coil packs fire repeatedly as left, right, left, right so you get that sequence.

The ZX6, as with most four-cylinder motorcycle engines, is mounted transversely in the frame. When sitting on the bike, the cylinders are numbered 1-2-3-4 left to right.

Firing Order: the firing order is 1-2-4-3. There is no distributor for the engine, as ignition is controlled electronically.

Extra Ignition Information: there are only two ignition coils for this engine. Each coil has two spark plug wires. One coil fires cylinders 1 and 4. The other fires cylinders 2 and 3

The Honda NSR125 doesn't have two cylinders - it has only one cylinder. If you have an NSR125 and it sounds like that, then you're "four-stroking" in the middle of the RPM range. "Four-stroking" (not firing exactly 50% of the time) is caused by too rich a mixture, which tells me that either your air intake has a problem or your carburetor wants more attention. If you only cleaned it by pouring carburetor & choke cleaner into the fuel tank, that's probably not enough - you'll probably need to disassemble the entire carburetor and run carburetor cleaner spray through every port & jet or put it in a dip tank until it's dead clean inside.

Since it seems to clear up at higher RPMs, it's probably not your intake - that's just get worse & worse at higher RPMs. I've gotta' say I believe your carburetor's still not clean inside.

Since it's running rich below 4KRPM, it should hurt anything except your pride & your bike's performance. It should NOT seize the engine - that'd happen if your fuel mix was too LEAN, but yours is too RICH.

Sounds like you're blowing a bit of oil through the cylinders. Pressure testing each cylinder will tell you if you have an issue.

First thing to do is make sure your intake and exhaust valves are adjusted to specs as this can cause popping from the carburetors and cause major engine damage if not corrected. As far as the bike not starting with the carbs on, make sure that they are clean. If any of the tiny fuel tubes, jets, emulsifiers or passages are gummed up or clogged with debris or fuel varnish, this can cause the engine to not start. If they have been sitting for a while with fuel in them you will need to disassemble them and clean them with a good carb dip or ultrasonic cleaner. A simple Google search will give you many pages on how to clean carbs properly. There are also reputable businesses and individuals that can perform this service for you if you would rather not deal with it yourself.

The ZX6, as with most four-cylinder motorcycle engines, is mounted transversely in the frame. When sitting on the bike, the cylinders are numbered 1-2-3-4 left to right.

Firing Order: the firing order is 1-2-4-3. There is no distributor for the engine, as ignition is controlled electronically.

Extra Ignition Information: there are only two ignition coils for this engine. Each coil has two spark plug wires. One coil fires cylinders 1 and 4. The other fires cylinders 2 and 3.

Addtional details in this link: images/4/45/ZX600E13.PDF

hope this helps (remember to rating this free answer).

you have fuel pressure problems

hi can any 1 tell me the fireing order for a 1996 zx6r sure its only fireing up 3 cylinders

here you go
Firing Order and Reinstalling Plug Wires:
B230F/T or B234 Four Cylinder: Firing order 1-3-4-2.

• Rear distributor: Left-to-right terminals are 4-3-1-2
• Side distributor: Front terminal is 1, thence clockwise around to 3-4-2
• Plugs: Front-of-engine-to-back: 1-2-3-4