carb problems!!

clifchub

New Member
Local time
11:54 PM
Joined
Sep 9, 2010
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Location
utah,usa
am confused. i'm new, just biult my first bike and am having problems with the carb. i have a Grubee skyhawk gt-5 66cc and the carb floods when i ride, but not if i just let it set with the fuel on, it has to be running to flood, and it wont idle. i use it to get back and forth for work, so any help will be appreicated.. and i live at 5000 ft above sea level if that makes a differance.:confused:
 
What exactly do you mean when you say flooding. Is it leaking outside the engine or out a vent? Sounds kinda like a stuck float although I don't know too much about the HT carbs.
 
I had the same prob, you have to set the two pieces of metal that hold the float inside the carb in order that they leave the needle to close the fuel line properly.. After that tight every screw as tight as you can for added safety..
 
sometimes the floats in these carbs (the n-t carbs) will get cocked sideways a little and cause the needle & seat to stay open. this will cause the carb to flood over because the needle & seat can not close to stop the flow of gas going into the carb. bowl.
sometimes a few taps on the side of the carb float bowl with a plastic handled screwdriver will fix this.
by tapping the carb bowl, it will cause the float to settle back into the position tht it needs to be in.
this may be what the problem is, or your float level is way out of adjustment.
if this is the case them you will need to do what jimkamenidis said.
this is setting the float level so that the float raises to the top of the bowl when the bowl is full just enough to close the needle & seat.
if the adjustment is off, the needle & seat will never fully close even when the float bowl is full. or vise versa...if the float level is set too low, the float bowl will never fill up enough and this will cause your eingine to starve for gas, or shut off if the float bowl runs empty too fast.
in other words, the needle & seat will close when the float bowl is only 1/2 full, and by the time it "asks" for more gas, the bowl is already empty.
 
Last edited:
Same issue

I just went threw that whole thing. motorpsycho said it all. I took it apart and drained the bowl 3 times and then it was better. But i also had an issue where my CDI plug boot was'nt making good contact and not burning all the gas and would foul out plug. so i took boot end off,cut off end of plug wire and re screwed boot in to make good contact. Did'nt get to take a real test ride though. Beer kick in ya know. dont wanna screw up my driving record.
 
carb flooding

I started having a similar problem about a month after my first build. I'd turn the petcock on and it would flood within seconds.I took the carb apart and the plastic dougnut they call a float was filled with fuel.It seem's it had a pinhole in it and filled up with fuel making it to heavy to rise and hit the needle valve to shut off gas flow. Went back to bikeberry where I bought my kit and the gave me a new one.Problem solved, so check your float.
 
ive found the flooding that occurs when running and not when sitting is always a matter of float height... just a lil too high, so when you get the vibration of the running engine...needle dont close fully.

at least i guess thats it cus lowering the level a little always fixes it...
 
thanks

adjusting the float worked on the flooding problem.. but it still wont idle. do i need to get a different jet for a higher altitude? i live at 5000 feet above sea level
 
phwoar, the altitude! im getting vertigo!

um... theres no idle circuit on the stock carbs :( so changing the one and only jet affects everything... so...possibly not.

then again... leaning it out some would help.

ie, go smaller on the jet... in fact, i reccomend it :)

arrrgh, i can never remember which way you go for alt ! i dont have to worry bout it :p
 
then again... leaning it out some would help.

ie, go smaller on the jet... in fact, i reccomend it :)

arrrgh, i can never remember which way you go for alt ! i dont have to worry bout it :p

Your right, there is less air at altitude so he needs less fuel.

Your head isn't too much a mess afterall. :helmet:
 
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