HSR 42 Poor Fuel Economy
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Stage III
Joined: Nov 2009
Posts: 3
Likes: 0
From: Oceanside, CA
HSR 42 Poor Fuel Economy
Okay so heres the dueal. I just recently put a new mikuni hsr 42 on my 05 dyna superglide sport. I run an 88 CI engine and have v&H big radius pipes, I also have a stage 1 ignition kit in there as well. The problem Im having is Im only gettting like 31-33 MPG. Which is horrible! And thats if Im lucky. the carb is currently set at its stock setting of 25 pilot, 165 main, and the stock jet needle that it comes with. My question is what jet configuration should I be running on my 88 CI? Anything would help out guys. I appreciate it.
Road Master
Joined: Jul 2005
Posts: 916
Likes: 3
From: Mauldin, SC
The 25 pilot jet is usually too rich, try a 20 or even a 17.5.
The standard accel pump nozzle is a 70, try a 50.
Stock needle is a 97, try a 98 (leaner) with clip in the middle.
Stock main jet is a 160, most folks use a 165.
You should be able to pick up at least 10 mpg.
The standard accel pump nozzle is a 70, try a 50.
Stock needle is a 97, try a 98 (leaner) with clip in the middle.
Stock main jet is a 160, most folks use a 165.
You should be able to pick up at least 10 mpg.
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,897
From: Bedford UK
A good choice of carb, but IMHO setting carbs up is a black art. You can either spend time buying and fitting different parts and possibly getting it better, or visit a tuning shop who knows their Mikunis and will sort it out in a blink. Your call on sorting it soon, or sometime!
Last edited by grbrown; Nov 11, 2009 at 04:31 PM. Reason: g
Road Captain
Joined: Apr 2007
Posts: 631
Likes: 0
From: MA
The 25 pilot jet is usually too rich, try a 20 or even a 17.5.
The standard accel pump nozzle is a 70, try a 50.
Stock needle is a 97, try a 98 (leaner) with clip in the middle.
Stock main jet is a 160, most folks use a 165.
You should be able to pick up at least 10 mpg.
The standard accel pump nozzle is a 70, try a 50.
Stock needle is a 97, try a 98 (leaner) with clip in the middle.
Stock main jet is a 160, most folks use a 165.
You should be able to pick up at least 10 mpg.
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