Is there a proper way to adjust the float in the (toilet) carb bowl?

deacon · #21 (**permalink**) 03-24-2008, 11:01 PM

yes sounds like a leak.....

Okay you sealed the manifold joint
you sealed the manifold gasket
you tightened the carb screws

so where else could it be leaking...
Head gasket
butt gasket

have you ever removed the head or even loosened it.

Pablo · #22 (**permalink**) 03-24-2008, 11:13 PM

Quote:

Originally Posted by deacon

yes sounds like a leak.....

Okay you sealed the manifold joint
you sealed the manifold gasket
you tightened the carb screws

so where else could it be leaking...
Head gasket
butt gasket

have you ever removed the head or even loosened it.

I had the head off when I flooded it out when I first got it. I did reuse the gasket but torqued it properly - and there are no signs of a gross leak and compression is very tight. I suppose it could leak when hot. But at higher RPM with partial choking it was running fine......could have not been hot enough to leak...hmm.....Well I did order a new head gasket, just in case. I'll do Norm's glass plate and Al paint techniques....

Butt gasket - it does not appear to be leaking, but why would a leak down there cause such a problem? Why is the but seal anymore critical than the case half (down the center) seal?

deacon · #23 (**permalink**) 03-24-2008, 11:17 PM

well the only think I can think of is when you pulled the head, you took pressure off the bottom gasket. If it separated it might have torn it. That would cause a small leak. The head gasket controls compression but the butt gasket seals the jug I think. Air might pass the rings from there I suppose.

Did you notice if the butt gasket was glued I can't remember if mine was or not/

Pablo · #24 (**permalink**) 03-24-2008, 11:24 PM

Sure I unloaded and reloaded the butt gasket. Didn't jerk on it, though. Didn't notice if it was glued.

Someone will need to explain why it needs to be a pressure seal......Norman?

deacon · #25 (**permalink**) 03-24-2008, 11:26 PM

well beats me but it seems the only place left for air to infiltrate. BGJ thinks so as well. I think I would lift the jug seal it with sealer and try it again. Unless norman tells you not to use sealer. Seal on both sides of the gasket. You can probably do it without removing the jug. just lift it a little and do the seals.

Pablo · #26 (**permalink**) 03-25-2008, 07:39 AM

Quote:

Originally Posted by deacon

well beats me but it seems the only place left for air to infiltrate. BGJ thinks so as well. I think I would lift the jug seal it with sealer and try it again. Unless norman tells you not to use sealer. Seal on both sides of the gasket. You can probably do it without removing the jug. just lift it a little and do the seals.

I guess as they say - in due time. I want to go one slot rich this PM and see what that does.

Also - we need a little two stroke theory here. Do these little engines need a pressure or vacuum lower case? I know some premix needs to go down for lubrication, but if vented does it really effect running???

Lastly - one detail I forgot. IF I have a intake leak - it's still at the carb/manifold interface - when that VIOLENT backfire happened yesterday I swear I saw some small amount of smoke at the joint as well as out the carb....I'm using a nice o-ring and sealant goop - but maybe something is fundamentally wrong at the interface not allowing a good seal.

deacon · #27 (**permalink**) 03-25-2008, 10:14 AM

There is a school of thought that those slots on the intake manifold at the junction can leak. I have no idea since mine never did. Someone said his were cut too long somehow allowing an air leak there. I'm not quite sure how that worked. If you grind them down, the carb tube would seat deeper I suppose. I honestly don't know.

A backfire is a violent change in pressure so again I have no idea. It shouldn't be backfiring to begin with though. But a backfire might blow out your sealant since it has to go somewhere.

There is no internal pressure in the gas tank to my knowledge. It is my understanding that the tank is purely gravity feed so has to be vented to prevent a vacuum from forming when the gasoline is displaced. Which is really what a vapor lock is I think.

Pablo · #28 (**permalink**) 03-25-2008, 10:05 PM

OK I give up.

I fully enriched the needle setting. It didn't help much....it started right up as usual and I warmed it up. I revved it, did pretty darn good. Rev rev....zing....running well...rev rev....put helmet on.....again.......rev rev ...and then brooooooooooooooooooooooooooooooooooooooooooog dead.

Pablo · #29 (**permalink**) 03-26-2008, 10:21 AM

I still agree with Bike Guy Joe. I must have an airleak somewhere…..and I think it's STILL at the o-ring at the carb/manifold. I'm taking the o-ring out and using sealant only as I should have. The o-ring is too thick, the manifold inlet end is not flat nor is the manifold round. Plus I will use a nice hose clamp and get rid on the nubs on the carb.

deacon · #30 (**permalink**) 03-26-2008, 10:44 AM

Well let me know this is really a mystery to me.