Tobynblevins Posted November 11, 2019 Report Share Posted November 11, 2019 My 350 has a koso carb.. the jetting is off bad. My pipe for 30 pilot jets and 280 main jets.. the main jet in my carbs are inch or 2 longer then the 280 main jets I keep seeing on ebay will they still work? I cant find a long main jet at all they all really shot. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted November 12, 2019 Report Share Posted November 12, 2019 Find a kit to drill jets. Start with figuring out thebit that fits. Then work yourbway up one size at a time till it’s flowing what you need. Quote Link to comment Share on other sites More sharing options...
Tobynblevins Posted November 12, 2019 Author Report Share Posted November 12, 2019 32 minutes ago, trickedcarbine said: Find a kit to drill jets. Start with figuring out thebit that fits. Then work yourbway up one size at a time till it’s flowing what you need. Sounds like guess work Quote Link to comment Share on other sites More sharing options...
Keno Posted November 12, 2019 Report Share Posted November 12, 2019 My 350 has a koso carb.. the jetting is off bad. My pipe for 30 pilot jets and 280 main jets.. the main jet in my carbs are inch or 2 longer then the 280 main jets I keep seeing on ebay will they still work? I cant find a long main jet at all they all really shot. Post a picture of the jet. I’m doubting your main jet is 1 to 2 inches long. Quote Link to comment Share on other sites More sharing options...
Tobynblevins Posted November 12, 2019 Author Report Share Posted November 12, 2019 4 hours ago, Keno said: Post a picture of the jet. I’m doubting your main jet is 1 to 2 inches long. But it is lol and that is forsure the main the pilot is about the same just skinny Quote Link to comment Share on other sites More sharing options...
Tobynblevins Posted November 12, 2019 Author Report Share Posted November 12, 2019 Never mind I'm fucking stupid.. that top screws off and that's that is jetted lol Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted November 12, 2019 Report Share Posted November 12, 2019 11 hours ago, Tobynblevins said: Sounds like guess work Not to bad really. Just takes experience to know how far to go. There are charts out there that show drill sizes to equivelant mikuni or keihin jet sizes. Pretty sure the Koso’s should jet out like mikuni. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted November 12, 2019 Report Share Posted November 12, 2019 These are the drill kits. Really no worse then changing actual jets. Just pull yours, twist the bit for 20 seconds, spray it with brake clean or compressed air and done. If you know what jets you should have you can be even faster since you don’t need to work up. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Keno Posted November 13, 2019 Report Share Posted November 13, 2019 So when you separate the needle jet holder and the Main jet, is the main jet a normal Keihin jet? Jet drills are nice unless you forget that a jet was drilled and think its a 150 and actually a 200 lol Quote Link to comment Share on other sites More sharing options...
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