Planet Minis

traut811

I recently got a mikuni 26mil carb for my tb108 (WOW what a difference over a 20mil carb BTW).

I was riding the 50 earlier, looked down and noticed it was dripping gas. It wasnt out of the bowl drain screw hole, it was just accumulating and dripping off the bottom (so im guessing coming out the overflow)

what do you guys think this would be? Or would anyone know what the float is supposed to be set at on a 26? (and how id measure it)
im going to go tear it down see what i see, I guess maybe other than float height, it could be a worn float needle tip?

thanks in advance.
Nick

trd20

Mine does it too, only drips when I'm riding or for a little after I finish. I took mine apart and couldn't find any problems, floats were fine, and it still runs good so for now I'm just gunna leave it be. Let us know if you find a way to fix it

traut811

UPDATE: took the carb completely apart, saw nothing out of the ordinary. Float needle still in perfect condition so i know its not leaking around that. BUT..the spark plug was gas-dripping wet lol so its pretty rich..would this have anything to do with the carb leaking? and looks to me like the gas is coming out of the bottom-overflow (where you losen the screw at the bottom of the bowl to drain it), not the upper overflow port.
any suggestions??

and trd20 you were the one who bought yours a little while back new from AHP for like $174 right? and youve had this problem since you got it?

firepower354

Check the float height? We run VM26's all the time and rarely see any leaks.

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trd20

Yep, ever since I put it on it's been slightly dripping gas out of the overflow, but I think it's because the floats are very sensitive on the mikuni's and any time it tips to one side or the other a little comes out. When its on a stand no gas ever comes out, but if its tilted a little bit, and I mean a little bit, gas begans to come out in small drops. It never runs like a jammed float would cause, just drips.

For now I don't really consider it a problem, the bike runs great so I figure why try to mess with something that works.

trd20

also if your bikes running rich, try switching to a smaller pilot instead of messing with the needle and main. We just put one in my buddies bike and now his bike runs perfect, no more dirty plugs. I run the stock size pilot in mine, but my bikes ported/polished whereas my buddies isn't.

traut811

you know offhand what pilot youre running (or your buddies) Im not sure what mine is offhand ill go look in a little, but it runs great up top, just loads up on the bottom end, so im sure its pilot/maybe needle

Terry do you happen to know what the float height is supposed to be (and how you measure it lol). I was thinking the same thing it was float height..i dont really know what else it could be the float needle isnt wore or anything..

trd20

I'm almost positive we put a #20 pilot in his, and I think it came with a 22.5.

jsuhr36

floats are set to high!! turn carb upside down floats should be flat across, not leaning down.. my mikuni came out of adjustment like that to when i got it.

traut811

I did this..almost positive they were level with the casting edge in the carb..it being to high would be the only think i could even think would be the problem though. Next weekend when i go home ill just adjust it a little.

pud

ive seen where the bowl on a carb will actually crack if u overtighten it, it will be very hard to see, usuallly u will only see it when its tightened down.

pud

it will just look like a hair. and it will stop dripping when your done riding cuz you turn the gas off...

traut811

i put a drain hose on the bottom overflow drain valve, thats where gas is dripping out of now (guess it was just running out the nipple and accumulating before). So i dont really think it would be cracked anywhere or it wouldnt be coming out the hose..

foster212

i had this problem blow in where the fuel enters the carb and push up the floats and it should stop ur air if it doesnt then ur needles wore mine was upside down when i got mine so it was just letting the fuel go right by

traut811

[IMG]file:///C:/Users/NTrautman/Desktop/DSC00922.JPG[/IMG]alright..so over the weekend i was home and got some pictures of the carb..i bought two carbs, both mikuni, both 26mil, they look different. haha.

the one i was using (first few pictures by itself connected to filter), has a really really short (i guess its the pilot) jet (see last pic, its the short one of the two). Took off the bowl of the second mikuni I got and its got a long pilot jet..which one do I need to get to get a smaller pilot? a short one or long one? the long one threads right up to my mikuni but runs like poop with it. Anyone know what kind of carbs i even have here?? (the one pic with the long pilot is when i screwed it into my current mikuni)

for the gas leak, Im going to check make sure the needle is sealing, then ill just adjust the height. If that doesnt work, Guess I wont worry about it and just let it be.

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mxkid247

this happens on my bike to... the gas hose from the tank to the carb isnt sitting tight enough on the carb so its spilling out from the hose you just gotta make your connection tighter from the carb to the hose

xlxrman

The same thing was happening on my VM26. I just pushed the little tab on the float toward the carb and it stopped doing it. Doesn't run any different now.

traut811

isnt leaking around the gas line connection..ive checked all those.

exactly what i was thinking, and what I plan on trying when i head home next weekend. BTW xlxrman, does the carb in my picture look like your VM26?? im not sure if its a VM or not, and if so does your pilot jet look like the long or short one in the last picture?

traut811

pax you know what it is then?? Im just trying to figure out what kind of jets I need to order. Didnt look like a VM to me either. Both have Mikuni stamped on the sides though

Paxracing

Its not a 606 vm 26 mikuni.