TT600R float bowl overflowing
 

Well would you believe it, but the float bowl on my 2001 TT600R is overflowing again (Deja Vue or what?!).

This refers to my earlier travails:-
http://www.horizonsunlimited.com/hub...arting-26306-2

As a recap, I believe that there are two main possible causes of this phenomena:

1. Leaking float which, therefore, does not float high enough to seal the fuel inlet jet.

2. Damaged/dirty seal at the fuel inlet jet.

Are there any more possible/probable causes and is there a single most probable cause, based on other bikes of this model? (or engine model - 3AJ as per the XT).

Background;

1. this has happened once or twice before including as per the earlier thread shown above - the difference this time is that banging against the float bowl with the end of a hammer is not stopping the overflow of fuel :rolleyes2: and opening the float bowl drain screw repeatedly makes no difference either.

3. The bike has been running fine as recently as yesterday with no fuel leaking.

Thanks for any suggestions,

Dave

Do not
 

rule out that a serious piece of foreign matter got stuck in there (you have an inline filter?). In addition, your float might be bent somehow making the level too high.

All of the causes can only be observed with the float bowl off, so good luck!

I have never heard of a leaking float on these bikes, but several float needle / seat assemblies wore out, which, in extreme cases, causes the same.

Auke

Thanks Auke, ever reliable for advice!

I take your point about a wrong float height setting could be caused by the pivot being bent rather than the float itself leaking - how common is it for the pivot to get out of shape and are there any other possibilities?

The reason I am not sure is because of the way this problem is intermittant. It is not there for some time and it then re-appears (that is how it has been up to now, but this last day it has been "consistent")! My guess therefore is some muck is in there. I have also tried blowing compressed air into the fuel inlet tube with the float bowl drain screw completely removed - air comes out of the drain and I was hoping this would dislodge any muck, but it is still overflowing after this effort.

A few more facts:

No, at present, I don't have an inline fuel filter but there is the usual one built into the tank. All of the fuel runoff from the carb has been very clean.

The bike is 6 years old, appears to be in good condition generally with low km run on the clock.

While I had the engine to bits recently I got the carbs off with a lot of difficulty; in fact I took them off the cyl head only after I had removed the cyl head from the bike - they are very tight in between the cyl head and the bike frame and an absolute pain to remove. Hence my many efforts to fix the problem without taking the carbs off again!!! Unfortunately, in concentrating on doing the work on the engine, I did not dismantle the carbs at all.

Grateful for any more thoughts before I go to plan B.

Dave

Hi,

The float bowl on my XT600E overflowed a while ago. I took the carb off, stripped it down, cleaned it up, stared at it, scratched my head, showed it to my Pa, who stared at it, scratched his head and said "I dunno."
So I put it back in and it's worked fine ever since. I think there may be a gypsy curse on 'em.

Matt

PS: I seem to remember having to specially adapt an Allen key to get the damn thing off!

Well what do you know.............
 

........It has stopped overflowing; the frustrating thing is that I don't know why! :rolleyes2:

I blew more air through both the drain screw and the fuel inlet, let more fuel flow freely and then bumped the front wheel directly into a brick wall a dozen times thereby compressing the suspension a lot and sending a jolt back to the carb (latter is a substitute for the hammer tapping!).

Something has changed but I have no idea what it is. Perhaps the float can stick in the open position in some way or other - anyone experienced that? (but maybe it is the gypsy's at work with magic potions and curses).

Dave

make sure its CLEAN clean, even something as thick as a hair is enough to hold it open

yes it is muck.
 

Get yourself the inline filter. The filter in the tank only catches bolts and elephants. The really tiny particles that are always somehow present are not caught by it, hence your troubles.

B'lieve me ...

Auke

PS: getting carbs off, never done it yet to my TTR, but the TXZ is also a bitch. Remove airfilter; loosen the clips around the carbbarrels, then tilt carb downwards to the rear, then move it to the left, making use of the flexibility of the intake rubbers to make it pass. Alternatively, break down your rear subframe partly.

Thanks again for the suggestions and I will look into getting an inline filter; I was going to do that some time ago but it got overtaken by a leaking base gasket.
I have read somewhere on here that the paper based ones can disintegrate and then block the fuel line or, worse still, the carb jets so I was a bit put off by that & then it was forgotten!

Getting the carbs off the TTR is really bad: even slacking off the subframe (as suggested to me in an earlier thread & I did it) did not help a lot because there is a damn big main frame cross member welded in right behind the carbs - this is so close on my bike that the carb diaphragm cover is touching that cross member + the oil tank underneath provides little room for manouvering in that direction. Hey ho!!

Dave