Where to buy jets

C

Carson2000

New Member
My 66cc engine is 4-stroking and I believe that getting a smaller jet would fix it. I have a high performance carburetor and the jet size is 78mm. What would be the best size to fix this and where could I get another jet?
 
The 5mm jets fit the nt carb, the 6mm fit the CNS carb. There might be copies or clones that use them also. I've never bought jets, I solder them up and drill to the size needed. I have had good luck with mine.
 
There is not a one size fits all when it come to jets, not even on identical engines. I've had some that ran great with a stock jet, some needed soldering and drilled to a smaller size. A couple needed drilling out to get them right. It all depends on the color of the spark plug and the seat of the pants test.
 

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That looks to be as said above Runtong or RT. Auto choke shut off. 5mm thread size. same jets as NT. I've had this carb on 1 bike that ran fine with the stock 70 jet that came with it. I'm at 60 ft above sea level and run 32:1 lucas or amsoil synthetic. I prefer the basic NT with a 66 or 68 jet. Remember this works for me- your results may vary.
 
A micro drill set is very helpful in tuning a carb, find the bit that fits the jet and mic it, that way you know exactly what size you have.
 
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I got mine from Amazon, #60-80 with a pen style hand drill. Less than $10
 
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