dead cylinder 4 any suggestions

I've also cleaned out all jets and components of carbs ... float seems to be slightly bent but not really ... Also I've under checked my timing cover and that's all good too.. I'm thank full for all the help I've been given and all the suggestions they are definitely needed. ..

123vucku wrote: I've also cleaned out all jets and components of carbs ...

Ummmmmm, define "cleaned out". What was your process? ...details please.

!Seymore wrote: Ummmmmm, define "cleaned out". What was your process? ...details please.

+1 When this has happened to me it has always been traced back to a plugged pilot jet or something else in the pilot circuit.

Taking apart the bowls and floats spraying all passage ways with carb cleaner removing jets blasting them with carb cleaner . Using compressed air after all the cleaning through the ports

Did you insure that the carb cleaner and compressed air came out the other end of all those tiny passageways? The carbs really need to be off the bike to see them all. There are some good tutorials with pics and drawings in the filebase.

Spraying starter fluid near the boot causes a change? That indicates a pretty serious leak that will need to be corrected before the bike will run properly. As previously mentioned, that leak is probably not the only problem.

How bent is the float? Proper fuel level is very important. These carbs are sensitive to even a couple of millimeters variance.

Beginning to look like the perfect storm

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clogged pilot passage plus badly leaking manifold plus maladjusted fuel level.

All you lack are some brain-sucking zombies :silly:

And just to cover one more base, on you kz900, one coil fires cylinders one and four simultaneously, and the other coil fires two and three. If yo swap the one and four secondary wires and the same cylinder will not fire, then the coil is not likely to be the culprit. If the other cylinder fails, then the most likely cause is the wire.
If you swap wires from adjacent cylinders, you wil not discover anything useful as they will fire at the wrong time.

The float has the fuel turned off. Clear tube test. Also I was watching a series on plane disasters. I'll write a thread on this. I've found insects like to make a home in small passages, LIKE THE VENT ON YOUR CARB? If it is not venting, it won't get fuel. Look for that. I've found this more than once on bikes and other things. In the case of the air plane wreak, a Mud Daubber had clogged the tube going to the air speed sensor making the pilot think the plane was going faster than it should so he reduced speed and fell out of the air. Stalled. It's usually something stupid.
Steve

Get the bike running( on the cylinders that it does run on) and then spray WD 40 into the non running carb. If it is a fuel problem the cylinder will fire up and the pipe will warm up at the exhaust flange. Take the float bowl off and see if there is fuel in it. Turn the fuel on and see if the fuel pours out with the bowl off. Take the carbs off and clean them the right way and use WD40 with the red spray tube attached to the nozzle to spray into every hole and make sure you have all air and fuel passages clear. Having said all that, it is probably either a clogged pilot jet or clogged float valve.

What kind of shocks are they on your bike?
Steve

I need to do the clear tube test at sometime. I am leaning towards carb /boot problems. As electrical goes I've swapped wires ( Meaning replacing the cylinder 4 wire with a new one) also got new plugs and moved around 1and 4 to the other coil and put 2 and 3 to the one 1 and 4 were on. Definitely thinking it's a float problem I plan on replacing the float and doing the clear tube test. I've cleaned several carbs before. The boots and carb need to be addressed no doubt ... can anyone tell me how to set the float level and what it should be set at . I have a Clymer manual just would like some of you good folks advice as it has definitely helped me narrow down my problem thanks everyone. Also can someone point me in the right direction of where to find out how to do the clear tube test or how to do it. I kinda know what it is but don't really know everything about it thanks

The engine is in a small go kart / dune buggy never had any problems before

Use a piece of tubing that will fit snugly in the drain hole or make a fitting to screw in. The level should 1/4" below the gasket right where the bowl flange is for the screws. Once you make one that works, you'll never try to measure dry again.
Steve