42mm hsr carb ac pump 70 or 50?
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Outstanding HDF Member
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From: redbank new Jersey
42mm hsr carb ac pump 70 or 50?
I'm running a 70 AC pump and was told a 50 is what I should be running.. I don't care about MPG just looking for the best jetting for making the most power. I'm running stage 1 with Andrews 21 cam
Road Warrior
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From: Arizona
This is the information that is included with the Mikuni HSR 42 Easy Kit...
Twin Cam Optional Tuning
Suggestion: Certain Twin Cam 88/95 cubic inch configurations may improve fuel mileage by using our #20 pilot jet, #50 A/P nozzle and #2 needle clip position. These parts are now included. Refer to the HSR Tuning Manual (page 8-9) for detailed instructions.
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You can find PDF files on Mikuni's web site for the HSR 42 Easy Kits parts contents as well as the Tuning Manual.
I have an HSR 42 kit on the way and I'm running a TC/88 SE intake and exhaust with Andrews TW 21G's.
If you're running rich you are not making peak power from the carb and wasting fuel too. How does it run, does it seem lazy? Black smoke?
Tech23
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From: redbank new Jersey
I have a cam but it seems even guys with more work run the 50
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Road Warrior
Joined: Jul 2008
Posts: 1,286
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From: Arizona
To me that would suggest you're running too rich then. You have the same cam I have. It's not a high performance cam it doesn't have high lift or long duration. It's a bolt in cam. It's as close to the stock cam profile as you can get from Andrews. Put the suggested jetting in I posted above and see how it goes. I'm thinking it will run better and get better gas mileage too.
Tech23
Tech23
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Road Warrior
Joined: Jul 2008
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From: Arizona