MrEvilPirate
Post Posted: Tue Mar 23, 2004 6:01 pm
 Subject: clarification on float height from faq (posted by wes)

In reference to my last post about my fuel problems-

After checking everything in the carbs, I decided that the float height is probably the source of the problem. I took them out when I cleaned the carbs, and maybe they got bent, who knows. The FAQ says this:

Fuel Level: 0.5 +/- 1.0 mm above the bottom edge of carburetor body
Float Height: 17mm

The fuel is drained, so I'm not sure how to measue its height.
I measured from the bottom edge of the carb body to the bottom of the floats, holding the carbs as they would be when installed on the bike. Is this the measurement that should be 17mm? Mine are about 22... Sorry if this is a stupid question, I've been messing around with this bike for the better part of the afternoon, and its kinda discouraging seeing the rain clouds roll in lol. 8)
Jeb
Post Posted: Tue Mar 23, 2004 6:13 pm
 Subject: hold them sideways...

so that the floats are free. then, tilt the carbs slowly toward upside down until the floats are just touching, but not depressing the valves. there's your measurement.
p1010028.jpg
MrEvilPirate
Post Posted: Tue Mar 23, 2004 7:09 pm
 Subject: Re: hold them sideways...

Thanks for the info and the pic Jeb. The floats were right on, so I'm more confused then ever. Drain screws are tight and the float chamber ring-o looks good, but I don't think the bike was leaking from these points. Air filters were wet. So is the float valve the culprit here? or will a new petcock fix this?
Also, is the float valve the part that hangs off of the bar going through the float? Thanks for the help Jeb.

-Dennis
Jeb
Post Posted: Wed Mar 24, 2004 8:30 am
 Subject: what's the symptom you're trying to fix, again?

fwiw, I have raised the floats (lowered the fuel level) by 1 mm on my of my ex250's; seems to make the take off a little more "crisp" (less hesistation). you have to compensate by richening the idle screws a bit, but this is easily done with the carbs on the (running) bike.
MrEvilPirate
Post Posted: Wed Mar 24, 2004 12:21 pm
 Subject: Re: what's the symptom you're trying to fix, again?

I had tons of gas in my engine oil. I know the fuel petcock was leaking, and Ian has told me I have float problems as well. According to him I need to replace the float valves, but I'm not 100% sure where they are. I think they are the part that hangs down off of the floats themselves, but they could also be the part the hanging thing contacs. Sorry for all the vague refferences.

-Dennis
Jeb
Post Posted: Wed Mar 24, 2004 1:09 pm
 Subject: the float valves are the little torpedo looking things...

hanging from the float tangs. they should have a conical tip; the tips are misshapen, there's your problem. otherwise it's likely the petcock.
MrEvilPirate
Post Posted: Wed Mar 24, 2004 3:18 pm
 Subject: Re: the float valves are the little torpedo looking things...

Float valves check out, no signs of wear. I checked all of the components Ian listed, and they all look good. You said that if it wasn't my float valves it was probably the petcock. Does this mean that it is possible to get gas in my oil with only a bad petcock and good carbs??? I'm confused because Ian led me to believe that both must fail for this to occur. Can't seem to find a problem in my carbs though. Thanks for the help Jeb, I appreciate it.

-Dennis
MarkB
Post Posted: Wed Mar 24, 2004 3:23 pm
 Subject: Re: the float valves are the little torpedo looking things...

Both the vacuum petcock and at least one of the float valves must be leaking for the float bowls to overflow. It could be that there was a particle of dirt or rust preventing the float valve from closing. Try draining a little gas into a glass and seeing if there is crap in it. A fuel filter might help, but it will be downstream of the petcock. Is your tank rusty?
MrEvilPirate
Post Posted: Wed Mar 24, 2004 4:22 pm
 Subject: Re: the float valves are the little torpedo looking things...

Tank very well may be rusty, got it off of ebay after someone stole mine right off of the bike. I just added an inline fuel filter after the petcock (new petcock on the way). Like I said, the valves look good. I'll cehck them again and use something to blow any crap that may be in there. The filter should perevent any more particles from jamming up the valves now. You think it may work now?
ex0r
Post Posted: Wed Jun 13, 2018 1:05 pm
 Subject: Really old

I know this is a really old post, and I usually don't necro them, but figured it was better to do this than to create a new post asking.

Does anybody know what the recommended float bowl height is for a 93 ex250? I tried 17mm +/- 2mm but that seems to be incorrect.

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