wont start

[ezjman]

I cannot get my t4 to start. I pulled the jug off to fix the powervalves. I was having problems with this before. I would have to pull start the bike to get it to start. I also rebuilt the carb which is a Keihin pwk35 including new float while the jug was off. The carb has 140 main a 65 idle jet the clip is on the middle slot of the needle. the air /feul screw is out 1-1/2 turns out. I checked compression of motor it is 205psi. I have removed plug after not getting to start and it is wet. I also checked for spark at that time and it had a good blue spark. I removed the carb and there is fuel puddled on reeds and the inside of the boot is soaked. I have tried to mess with the float adjustment several times and nothing works. Seems like it is flooding the motor.

[Senator]

It does sound like it's flooding the motor. Some of the PWK guys on here can maybe help more than I can with the jetting specifics but a few things are for sure.

-Your compression is good, very good. In fact you should be at least considering race gas or a race gas mix.

-35mm is small, even if your still at 250cc. 38mm's get along better with the stock T4 top end.

Have you tried starting fluid in the spark plug hole? If it starts without being pull started I would think that could help you diagnose a rich condition. A wet plug already suggests this. Keep us posted man I'm sure it's something simple

[asnowmobiler]

It sounds like the float needle/seat is leaking. Once a plug gets wet on a 2 stroke,they need to be replaced.
If the crank case is flooded with gas,you need to get it out of there ASAP,it will wash all the oil off the bearings and foul your new plugs when started.

[E-richh66]

Toss a clean piece of fuel line on the carb when you suspect your float bowl is full of fuel. Blow into the other end. (blow only, do not suck or you will be unhappy) You can verify your float needle is seating this way. If you can blow air past it then fuel is getting past also and flooding your engine. If it's dead headed than it's closing and the problem is something else.

[asnowmobiler]

That's great advice..
These fuel pumps are low pressure,so blowing against the needle/seat will surely tell you if it's leaking in the real world.

[ezjman]

I am going to try what you said erichh66 thanks. I will let u know what happens. where is the fuel sucked up through in the carb when you are starting the bike, pilot jet?

[E-richh66]

Mostly, yes when the slide is in the closed position. Once the throttle is cracked the needle jet takes over until it's high enough to start the venturi effect in which the main jet does the work. The point being however, if the fuel supply to the bowl isn't being shut off when the bowl is full, it will find it's way through someplace and actually start siphoning it's way down hill. This usually results in the bottom of the crank case filling up. This obviously makes starting the bike near impossible. I've actually had to turn bikes upsidedown with the plug out and drain the fuel out of the crank case before, due to bad float seats. I recently set up a Lectron for my bike and one feature that I thought was really cool is the clear float bowl with desired bowl level markings on it. Float setting or needle/seat issues can be identified at a glance.

[canada's t4]

your pilot is too rich i have the stock pwk and im runnin 45 pilot and 150 main

[ezjman]

Ok I removed the carb emptied it out and put it back on and turned on the gas. I removed feul line and put new tube on and blew in it. I could not get any air pass. I have recently rebilt carb including new float and float needle. Seems like the needle is seating. This was all last night. I come home today from work and look at the carb and it has leaked slightly and if I shake the bike just alittle I can get feul to come out the overflow tube. There was also gas sitting at the 2 ports of the intake bell, where the carb hooks onto for the tube to the airbox. these holes look like they are for the air/feul mixture screw and the other i dont know. Before this whole procedure I had set the float level real low. So i dont think it is a incorrect float level. I set it way low just to see if i could get it to stop flooding which it didnt. Is there other ways to get gas into the bowl other than the float needle? It really seems like I am having some type of carb problem

[asnowmobiler]

Try leaving the gas cap loose,so it does not build pressure.
The fuel only gets in one way,that's past the needle/seat.