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Bore Size: HSR42
Sold in Units: Kit
Bolt on HP! throttle response improved and cold starts as well.
This kit is for 2003 and earlier Sporters with Keihin carburetors that need to be replaced. It requires 2-3534B breather bolts to make it fit 2004-06, and even then the air filter element and the cover must be 2003 to work correctly. The carburetor does deliver better milage and quicker throttle response, and it almost eliminated backfire on my 2005 1200C. Because the accelerator pump stroke is adjustable, it should resolve the backfire issue on almost any Harley. However, for what it took to make it fit, I wish I had chosen the S&S Super E kit instead. BTW, don't call Mikuni and ask for help. They won't talk to you. J&P's staff was far more help to me when the new air cleaner parts didn't fit with the existing parts listed in the instructions.
I think the mikuni carburetor is great. The box came complete with everthing that you need to install it. The directions were clear. It fit without any special modifications. Once installed, it was real easy to adjust the a/f ratio and set the idle. The jets that came with the carburetor are just right for me. Not only did the bike run better over the stock carburetor, but the fuel mileage was better too. It is a great product.