Another HSR 42 tuning question
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Cruiser
Joined: Apr 2008
Posts: 100
Likes: 0
From: Minnesota
Another HSR 42 tuning question
Can I get peoples best guess on what to start with? It is going on a 95" with stock heads, 9.3 compression, khrome works slip-ons, SE air intake with K&N filter. SE 203 cams.
What needle, pilot, main, and accel pump jet?
What needle, pilot, main, and accel pump jet?
Tourer
Joined: Aug 2008
Posts: 385
Likes: 0
From: Diamond bar, California
Id start with the #25 pilot jet, leave the needle alone for now, and a 155 main.
leave the stock squirter in for now.
you may want to consider the Head-Quarters tuning kit, it cheap 20$ or so, but it helps lean the mid range abit.
leave the stock squirter in for now.
you may want to consider the Head-Quarters tuning kit, it cheap 20$ or so, but it helps lean the mid range abit.
Last edited by new_mentor70; Feb 10, 2009 at 11:35 PM.
Road Master
Joined: Jul 2005
Posts: 916
Likes: 3
From: Mauldin, SC
98 needle, clip in the middle
20 pilot
165 main
50 pump nozzle
That's what I ran in my '03 Dyna with pretty much the same setup you have. This is a popular combination. You may get away with a 17.5 pilot or may need a 22.5, you'll be able to tell once you get it together and set the idle mixture screw. The stock 25 pilot is usually rich.
The Mikuni tuning manual is good.
20 pilot
165 main
50 pump nozzle
That's what I ran in my '03 Dyna with pretty much the same setup you have. This is a popular combination. You may get away with a 17.5 pilot or may need a 22.5, you'll be able to tell once you get it together and set the idle mixture screw. The stock 25 pilot is usually rich.
The Mikuni tuning manual is good.
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