66cc HT CNS Carburetor Issues

[skrufryder]

oh That carb i think is to large for the little 50...I delivers to much gas....that big carb is better for the 61-66... Try getting a smaller set of jets for it....the NT carb is a better fit for the 50... you could try to open the ports on the cylinder... that might help it run better

www.spookytoothcycles.com/component...age=vmj_ace.tpl&product_id=441&category_id=93

 

[montezumasviper]

I hate that thing. I've had the exactly same issues as you. One experiment to try is shutting off the fuel while riding, does the engine perform very well soon before it runs out of gas in the bowl?

Heres what I've found works,

Unscrew the float, there is a bar that holds the float assembly up. If you have ever tipped the bike on its side this bar comes out of place and prevents the float from stopping fuel flow.

Use the needle from the original nt carb. This should help a lot. And honestly, don't worry too much about the vents, covering and uncovering them doesn't seem to make a huge difference.

My bike literally wouldn't run until I did these things and now its the plug is light brown, good luck

 

[Lazieboy]

Air filter

http://www.kingsmotorbikes.com/bike-motor-engine-air-filter.htm

Would this fit easily on my factory grubee 66cc carb or do you need newer carb. They dont say and i dont wanna get burnt.

 

[Lazieboy]

Carb or plug ?

Hey. My 66cc grubee runs good for a block or so then dies like it's out of gas but not. Pull the plug and its wet, so i clean it put it back in and goes for another block and dies again. I have been alternating 2 plugs same story.
I reciently took carb apart to check jet,put it back togather. so i did it again 2day to double check all looks good. I really need help on this. its like it's getting too much gas or not burning it completely. Whats the dealio.

 

[motorpsycho]

http://www.kingsmotorbikes.com/bike-motor-engine-air-filter.htm

Would this fit easily on my factory grubee 66cc carb or do you need newer carb. They dont say and i dont wanna get burnt.

you would have to make a round adapter to screw onto the carb. where the stock air filter screws on. then, the rubber peice on the back of that air filter you show, can be clamped around the adaptor.
I bought a filter off e-bay and it came with a velocity stack / carb. adaptor for a little more money. I could have made an adaptor myself, but it was just easier to just spend a little more $$ and get one that was already made.
this is similar to the filter i got and it works great. This is not the buyer that i got mine from. you shoudl measure your carb. screw holes to make sure it will fit before you buy it.
http://cgi.ebay.com/UFO-Chrome-Air-...188?pt=LH_DefaultDomain_0&hash=item35a590f0ec

you can do a search for "ufo air filter, pocket bike air filter, go ped air filter, scooter air filter" to see if there are other styles and prices.

 

[motorpsycho]

Hey. My 66cc grubee runs good for a block or so then dies like it's out of gas but not. Pull the plug and its wet, so i clean it put it back in and goes for another block and dies again. I have been alternating 2 plugs same story.
I reciently took carb apart to check jet,put it back togather. so i did it again 2day to double check all looks good. I really need help on this. its like it's getting too much gas or not burning it completely. Whats the dealio.

is this the stock carb, that came with your engine?
if the plug is wet, then you are definitly running way too rich. the float coule be sticking in the down position, causing the carb to flood over. but you said that you took it apart and everything looks good.
do you have anything hooked to the white wire from the magneto?
the reason i ask is that if you hook a headlight (or something else) to the white wire, it will steal power gong to the cdi, resulting in a weak spark.
also, check your wiring connections and make sure no bare wires are touching anything, and look for loose connections.
you shoudl really get rid of those push together connectors and solder & heatshrink all of your wiring connections.
your problem could be electrical and not so much the carb, running rich.
it could be that the spark is weak, from low power going to and coming from the cdi.

 

[Lazieboy]

will check

is this the stock carb, that came with your engine?
if the plug is wet, then you are definitly running way too rich. the float coule be sticking in the down position, causing the carb to flood over. but you said that you took it apart and everything looks good.
do you have anything hooked to the white wire from the magneto?
the reason i ask is that if you hook a headlight (or something else) to the white wire, it will steal power gong to the cdi, resulting in a weak spark.
also, check your wiring connections and make sure no bare wires are touching anything, and look for loose connections.
you shoudl really get rid of those push together connectors and solder & heatshrink all of your wiring connections.
your problem could be electrical and not so much the carb, running rich.
it could be that the spark is weak, from low power going to and coming from the cdi.

Yes stock,nothing hooked to white wire no lights or anythin,I will re check float and ele. connections. I am using 32:1 gas and have for a long time. Wish me luck.

 

[Down_n_Dixie]

Raining today so I will not be able to tinker with my engine But I Like the idea about switching the needle out with the nt carb, Just need to find someone who will let me switch em lol. Also I will have to look into the weak spark problem motorpsycho mentioned. So, Since I cannot ride my bike today I decided too look inside the cylinder And when I pulled the head its a nice tan/brown color on the plug side(slant head) and black on the far side. Could this mean my engine is experiencing detonation? Oh, and I have tried the ol shut off the fuel trick and yes, it runs much better with more power and response until it dies.

 

[Lazieboy]

fixed

Drained tank and carb, checked all components in carb,reasembeled,filled with new gas, now working. hu

 

[motorpsycho]

since you drained the tank AND the carb, the float in the carb. MIGHT have been slightly crooked, allowing the needle & seat to stay open, causing the carb. to flood over.
you MAY have corrected the problem without even noticing that you did anything when you took the carb, apart.