HSR 42 Problem
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Joined: Jan 2010
Posts: 17
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From: New Jersey
HSR 42 Problem
I have a 89 Softail with a 80ci evo. It has 1.75 drags with lollipop baffles and screaming eagle cam, I forgot the specs. I installed a Mikuni HSR42 with a swap meet aircleaner that uses a foam element. I know the air cleaner is not the best for flow, but it is the look im going for. So i have multiple problems:
1: Bad gas milage- like 20 or so
2: Fuel vapor coming out of the air cleaner (might be cam overlap, i want to time the bike)
3: Pops from the carb when its colder out
I have a 30 pilot, stock main, lowered the needle one notch and disengaged the accelerator pump to like 1/4 throttle engaged. The spark plugs were black at the base but the electrode seem to just be slighty sooty. The bike runs good, I just want better gas milage and limited vapor coming out of the aircleaner.
Any help with jetting and tuning would be appreciated. Thanks.
1: Bad gas milage- like 20 or so
2: Fuel vapor coming out of the air cleaner (might be cam overlap, i want to time the bike)
3: Pops from the carb when its colder out
I have a 30 pilot, stock main, lowered the needle one notch and disengaged the accelerator pump to like 1/4 throttle engaged. The spark plugs were black at the base but the electrode seem to just be slighty sooty. The bike runs good, I just want better gas milage and limited vapor coming out of the aircleaner.
Any help with jetting and tuning would be appreciated. Thanks.
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
Check to ensure the enrichner is all the way in, also the CV brass piece for the enrichner will not work with the Mikuni. The cable and spring will but the brass end has to be the Mikuni.
Set the accelerator rod to .080" clearance to start, if it is too far open it will cough when you give it throttle. Check your float level it should be 18MM. Set the idle mixture screw about two turns out to start. You should be getting about 40 MPG with the combo you have under normal riding conditions. However if you are pounding it then 20 MPG is about right. The foam elements can be restrictive and act like a choke if they do not have enough filter area. You can also go to the Mikuni web site and download their tuning guide. Hope this helps.
Set the accelerator rod to .080" clearance to start, if it is too far open it will cough when you give it throttle. Check your float level it should be 18MM. Set the idle mixture screw about two turns out to start. You should be getting about 40 MPG with the combo you have under normal riding conditions. However if you are pounding it then 20 MPG is about right. The foam elements can be restrictive and act like a choke if they do not have enough filter area. You can also go to the Mikuni web site and download their tuning guide. Hope this helps.
Last edited by miacycles; Jul 26, 2011 at 10:34 AM.
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