Speed Carb Question

[FrizzleFried]

I've been reading that the "authentic" speed carb has a petcock attached to the carb itself. Evidently the other ones that are so popular (red air filter cover) that have asian writing on them are just NT carbs with bigger jets (or something to that effect).

I have one of those... the one with the asian writing on it... sans petcock. Would I see a benefit going to a "real" speed carb at all? I read something about the throttle body being different....

 

[DAMIEN1307]

I have one of those... the one with the asian writing on it... sans petcock. Would I see a benefit going to a "real" speed carb at all?

Lets see some pics of the carby your talking about...That is always the best way to get a good answer to that question from those that already have one and can tell ya without just guessing as to what ya got...lol.

 

[FrizzleFried]

This is a picture of the "official" speed carb with petcock...

This is a picture of the asian writing speed carb that came with my kit:

 

[DAMIEN1307]

I've been reading that the "authentic" speed carb has a petcock attached to the carb itself. Evidently the other ones that are so popular (red air filter cover) that have asian writing on them are just NT carbs with bigger jets (or something to that effect).

You were right to question the term "Speed carb" ...What I am seeing from your pics is just another NT carb with the standard #70 stock jets that come with them.

I changed out my NT kit carb with a JRL BoFeng carby which was a night and day improvement over the normal NT...It still comes stock with a #70 jet like the NT, but runs so much smoother and better with full throttle response through all throttle ranges, and the price is ridiculously cheap as well...lol.

https://www.amazon.com/JRL-Carburetor-Stroke-Motorized-Bicycle/dp/B08N9WYS1V/ref=sr_1_7_mod_primary_new?keywords=motorized+bicycle+carburetor&sbo=RZvfv%2F%2FHxDF%2BO5021pAnSA%3D%3D&sr=8-7

 

[FrizzleFried]

Just bought it. Will report back on if it improves performance.

 

[FrizzleFried]

Welp... I got the Bofang carb above. Unfortunately... it's no bueno. I am getting 4-stroking continually at anything above 25% throttle... I've tried leaning out the needle but that's all low throttle adjustment anyway I believe... I literally get ZERO window where it's not 4-stroking after about the 25% throttle mark...

Not sure what to do other than to go back to the other carb. I don't have a jet set to play with that end...

Bummer. At least it was cheap.

 

[DAMIEN1307]

Bummer. At least it was cheap.

Here is the jet set that fits the BoFeng carby in the URL below.

Amazon.com

 

[FrizzleFried]

4-stroking... bigger jet? Smaller jet?

 

[FrizzleFried]

Something is seriously wrong when the jet set costs more than the damn entire carb!

...just sayin'.

 

[DAMIEN1307]

Something is seriously wrong when the jet set costs more than the damn entire carb!

...just sayin'.

Those jets are the most expensive parts of those carby's...lol...lol.