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  #1 (permalink)  
Old 06-10-2017, 09:21 PM
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Stalling on throttle blip

I just got the bike up and running finally!! Now the last thing I have to do it dial the carb in. Here is what I have going on:

-The occasional stall when blipping the throttle at idle. The bike starts and idled fine. What adjustment should I make so it won't stall on the blip? How many turns out from seated should I be with the air screw?

Ultima 127
Mikuni 45
-32.5 idle jet
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  #2 (permalink)  
Old 06-10-2017, 10:02 PM
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I don't know about the Mikuni but the s&s G does that from the factory, that's why they came out with the super G with the extra gas port... to stop that...Hopefully that is not an issue with

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Last edited by Shovel52; 06-10-2017 at 10:04 PM..
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Old 06-10-2017, 11:09 PM
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Hey maybe go one size smaller on the pilot jet. Or move the needle clip one position up to leaner.
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Old 06-11-2017, 03:19 AM
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idle air screw should be about 2 turns out, turning in richens it out leans it. You jetting should be about right, needle clip two from top. I dont have a 127 but a 111 with a 45, got this jetting info from another site 127 at sea level, best way to dial in carb is with air fuel meter, checking front and rear cyl tune to leanest cyl. Make sure the accl pump nossle is spraying centre of carb throat hitting needle. Check out mikuni tuning manual online. Hope this those pipes your running will be probably hard to tune to much reversion from short headers..........

Last edited by meanmother57; 06-11-2017 at 03:28 AM..
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Old 06-11-2017, 04:24 AM
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If gradual throttle revves up without hesitation and quick does some hesitation, perhaps the accelerator pump can be too economical. At least that,s what needs adjustment on G carb or R1 carb
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Old 06-11-2017, 07:26 AM
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The Mikuni is really adjustable, you can set when your pump shot starts and stops. So what STEINBVG said and check your pump adjustments.
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Old 06-11-2017, 10:07 AM
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Sound like a lean out...Maybe bump up the Pilot jet...Don't go too crazy with the Acc pump.
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Old 06-11-2017, 08:44 PM
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Add some accelerator pump shot to it. It won't take a lot but you'll see the difference as you get close to where it is happy.
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