ORIGINAL: mike31
I have run ST 2k, 3k and 4500 sizes all on medium fuel tubing with no problems. The fuel is limited by the opening in the inlet nipple at the carb anyway. If there is a larger inlet nipple available please let me know where I can find one to try. Large fuel line does get more fuel to the carb but again is restricted to the opening in the nipple. Drilling the nipple may allow more fuel but leaves the nipple wall thin enough to break through. Just my observations.
I drilled my fuel nipple out, and tnen soldered a couble or so turns of copper wire over the end to make a nice lip. I then used large fuel tubeing from the clunk t o the nipple and replace the brass lines in the tank with bigger ones. That was a pain as I had to rework the cap to allow them to fit thru it. I also soldered a couple of turns of copper wire around both ends of the brass lines inside and out. All fuel lines connections were then saftied with Some stell safty wire over the tubing in front of the lips on the brass lines and and clunk and and engine fuel nipple. I made very sure I had NO BURRS OR SHARP EDGES ANYWERES.
The fuel tubing ain't comming off with out tools.
11% oil.
I Lost the muffler in a cow feild so made one from a hair spray can. Can is to big and I will replace with an aluminum Pepsi bottle like the long neck aluminumBudwiser bottles. I think the LARGE hair spray can is not only butt ugly but is way bigger than needed. The aluminum Pepsi bottle has a volume (
if I calculated correctly) of around 15 times the engine displacment, and the hair spray can is at least double that.
Power went up markedly and noise was much lower.
A lot of work over all but then I love to tinker with these things If I could not tinker it would not be any were near as much fun or satisfaction.
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