Stock carb mod

But that hole that you drilled is pulling a saturated mixture of air and fuel, and being soooo small, that should not be the problem, especially since you say the hole you drilled was smaller than .041 What size drill did you use to make the hole? I would check the jet to make sure there is nothing in it restricting the fuel flow if you are sure there are no air leaks. Then you could try a larger jet.

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"No such thing as a stupid question, just a stupid answer"

48cc Grubee Starfire Round Head......

All that I can say is that after much comtemplation I took Egors advice after I tried ordering extra jets drilling them thinking that my motors were starved for gas opening up the the holes on the jets did nothing made it worse.On the other hand if you do it just like Egor says it will help. it helped both of my motors,both on top end and Idol.I was so convinced I drilled my third carb thats going on my OC schwinn chopper before installing the motor.

well i guess mine wasn't smaller! .0625 i know the jet is clean, and i cleaned everything else with compressed air. if it was just gas saturated air then it should run with the choke off. i drilled my hole a little to the right of where Egor drilled his, so its not at an angle and more in the center. was that a mistake? i dont see how it could make a difference...

thanks for the help guys

When I drilled the jet on my one engine,from what ever size it comes from the factory,thinking that my engine needed more fuel to .040 the motor ran like crap so Im thinking it's .025-.030 I dont know I dont have gauge pins to measure it.So the point is I dont think you can change it much so if you did drill the carb.0225 larger and not with the air flow 45' you may have made a mistake use a torch tip cleaner to open the jet,a little at a time. that monkey losend my plug and it blew out yesterday.

The hole is too big. It is drawing too much air and fuel, probably mostly air if it runs with the choke on. I would solder it closed and redrill it at the .041 or leave it soldered closed. You can get the bits at most hobby shops, The drill desingnation size you would want would be #59 although I am sure a #58 or #60 would work fine......

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"No such thing as a stupid question, just a stupid answer"

48cc Grubee Starfire Round Head......

thanks, that sounds good, i'll do that.

Just make sure you take the carb completely apart, idle screw, float, float seat and needle, there might be some orings that could melt..
Good Luck........

__________________
"No such thing as a stupid question, just a stupid answer"

48cc Grubee Starfire Round Head......

thanks a lot

Let us know how things go. By "us" I mean me. Thanks. Rich

Does anybody know if the coil C.D.I or whatever it is the little black box that the spark plug wire comes out of is worth up grading? Still can't get the rpms I want.