Stock carb mod

Got it going. Wires were crossed...Duhhh!!

Mike the piston skirt mod only goes on the intake side, you can leave the ends long and only carve a notch the size of the port in the center 1/4 up max. Round everything over, no sharp edges. Let me know how it works. have fun, Dave

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Chuck - The monkey has the spark plug again!

Dave, it worked great. It seemed to improve the overall performance. I did not notice a big increase in HP however it seems to run much smoother in all RPM ranges. It also seems to have increased the top RPM's. All in all I would recommend this MOD. If someone could post a step by step guide, it would be great. I did not have a camera at the time of my Mod. I think more people would attempt this with a guide to go by. Thanks for the help.

does anyone know the torque specs for these China motors? Also, Egor, the size of that hole..is that mm or in. I have down to 1/64th" (0.40mm) is that big enough?

Hi J, 1/64th is WAY too big. E-bay has a set of micro bits with a .039 bit that will work, Search Item number: 260288126783. What part are you needing to torque? Head bolts are 10 to 12 ft lbs. Hope this helps.

Here is another set of bits on e-bay. This is the set I have. Search Item number: 300259348928

When I did my carby I went to the local hobby shop, they carry alot of individual micro bits....

thanks for the torque specs on the head bolts...I'm gonna do some porting today and didn't want to over-torque...Thanks for the drill info. I might still drill the stock carb, but my buddy used to have a pocketbike/scooter shop and wants to give me a tuned pipe and performance carb to play with...the biggest upgrade I've done so far is getting a 34T sprocket from Kings! Went from 32mph top speed (at about 6k rpm) to 40 mph at 55k rpm, but I know with some porting and ignition I could get to 45mph no problem.

Be careful if using stock head bolt studs. I hear a lot of people strip them out around 9 ft lbs. I would upgrade to better studs if you do a tear down.

Be careful with the 9 LB. that is a bit high. I never use a torque wrench on these little engines. I use as small of a 1/4 ratchet as I can find and just put a little Wallie on it, not to much. I also use a small amount of Silicone, and I mean small, just enough to make it shine. I always put the gasket facing the same way and the same top. Yes the .040 is in inches a 39 will do. I need to get a photo essay to show the way. Have fun, Dave

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Chuck - The monkey has the spark plug again!

"BUT I'M NOT DRILLING MY JET!!! PERIOD!!!!!!!"

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