Carby Carburetor - help with my grubee skyhawk 2 stroke 66cc

Dyran

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Jul 8, 2011
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New Orleans, Louisiana
I've been having my bike for about 3 months now but ive been having a problem with it. when i dont have the choke at least halfway i cant get any power out of the engine, also when i twist the throttle past about 3/4 it sputters and dies. I dont know if its the carb. because ive been messing with it since ive had the bike trying to get it to run right. any solutions to my problem?
 
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Got good spark. your not using the white wire from motor are you? its only for 6v lights. My new grubee kit had CDI hooked up wrong gave some issues. my kit is only a couple of weeks old so it needs to be broke in. I cant get more than 1/2 throttle and it bogs and i dont wanna push it yet. I could feel it when old motor gained power. before it blew a ring.
 
no im not using the white wire, i followed all the instructions exactly, i actually took the kit apart and switched bikes. i also had one of my friends who has the same engine as me come over and help me build it. now that i think about it, my problem might be the oil to gas ratio, because im still using the 16-1 ratio after having it for 3 months, but im not sure if ive broken it in enough, i try to ride it every day but i lose track of how far ive actually gone.
 
Speedo

If u'r gonna get a speedo search this site as not all speedos will work good with engine. it can make them not work or be off. I got a wireless bell from walmart.

Now my max speed is 20mph kinda comfortability. but with old kit that was broke in it was 32mph top speed on LZ2 build.
 
I've been having my bike for about 3 months now but ive been having a problem with it. when i dont have the choke at least halfway i cant get any power out of the engine, also when i twist the throttle past about 3/4 it sputters and dies. I dont know if its the carb. because ive been messing with it since ive had the bike trying to get it to run right. any solutions to my problem?

First check for a vacuum leak, starting at the carburetor. Go buy a "O" ring that will fit into the carburetor where it meets the intake manifold. The cap where the cable is prone to leak.
 
yep i'm guessing that you have an air leak at the carb/intake manifold.
9 times out of 10, if you have to close the choke to get a warm engine to stay running or accelerate, you have an air leak.

a normal o-ring (for the carb to intake seal) that you can buy at the hardware store will swell if it comes in contact with gasoline because they are just made out of rubber. if it swells it can become week, break and end up in the engine.
you need to buy an o-ring that can handle gasoline, and sick bike parts sells them.
 
yep i'm guessing that you have an air leak at the carb/intake manifold.
9 times out of 10, if you have to close the choke to get a warm engine to stay running or accelerate, you have an air leak.

a normal o-ring (for the carb to intake seal) that you can buy at the hardware store will swell if it comes in contact with gasoline because they are just made out of rubber. if it swells it can become week, break and end up in the engine.
you need to buy an o-ring that can handle gasoline, and sick bike parts sells them.

NAPA has them, that's where I buy mine.
 
I've been having my bike for about 3 months now but ive been having a problem with it. when i dont have the choke at least halfway i cant get any power out of the engine, also when i twist the throttle past about 3/4 it sputters and dies. I dont know if its the carb. because ive been messing with it since ive had the bike trying to get it to run right. any solutions to my problem?

Dyran:

I'm a new guy also and was having the exact same problem with the CNS carburetor. I knew that it was running too lean so I decided to move the adjustment on the needle from #2 to #3. Tinkering with the adjustment screws did not prove to be successful.

When I opened the carb, I found something that was interesting (to me). There was no gasket on the (top) throttle plate, which opens directly into the throat of the carb. It had to be sucking too much air. I made a small gasket from some gasket material and the carb works much better now. It will now idle and respond to the throttle, without the use of the choke being deployed. You should now be able to make some minor successful adjustments to the two screws on the outside of the carb in order to get it to run correctly.

BTW - be sure to check the tension on your throttle cable too.

I went from really aggravated about the CNS carb to "another happy camper" after I installed the gasket. Maybe it wasn't designed to have one, but it sure works better with one.

Old Skool
 
One other thing, my engine can idle, but you can't choke it in order to idle. I don't know if that changes anything, but I just thought I'd share that. Thanks for all the help guys and I'm going to buy an o ring as soon as I can.
 
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