Quote:
Originally Posted by Weldangrind
Yes, the slow and main jets are in mm. I doubt that you'll find bits small enough to drill out the slow jet. I often drill out main jets.
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OK, so I got a Mikuni for Christmas and it came with 100 mains and 20 idles. fitted it on and took it for a rip. it's definitely running lean, popping in the muffler on coast down and the plug was whiteish.
the closest drill I have in my index is .042", so this would be about a 107 main hole. It idles a lot better than the keihin once it's up to temperature and there's a lot more power to be had. it runs right thru the red line in all the gears without breaking a sweat.