Lean running 883/ hammer 1250 conversion? - Harley Davidson Forums

Carburetor Related Find discussions on carburetor related goodies here. Swap and trades? Rebuild information and tuning for the pre EFI systems.

Lean running 883/ hammer 1250 conversion?

Thread Tools Search this Thread
Old 07-17-2017, 12:37 AM
Lee Gibson Lee Gibson is offline
New Member
Thread Starter
Join Date: Jul 2017
Location: Montana
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Default Lean running 883/ hammer 1250 conversion?

Hey guys, a quick run down of what my issue is. I have an 01 883 that I just did the hammer 1250 basic conversion on. I kept stock heads and stock ignition (just retarded it a little). I put in a 45 pilot and 185 main, the bike HATED the 45, wouldn't stay running unless I was at 1/4 throttle and it was puking black smoke, even with the mixture screw at 2 turns out. I put the 42 pilot back in and it ran much better, except it's running lean (plugs are white) and it's popping and back firing on deceleration, even with the mixture screw about 5 turns out. I asked hammer and they had no idea what could be the issue, said they've never seen a bike not like the 45 pilot like mine did. Any one here have some advice of what may be going on? Thanks in advance
Reply With Quote
Old 07-17-2017, 11:21 AM
grbrown's Avatar
grbrown grbrown is online now
Club Member
Join Date: Jun 2007
Location: Bedford UK
Posts: 37,668
Thanked 985 Times in 913 Posts

Hi from the UK and welcome to HDF. We have many members with a lot of Hammer 1250 experience over in the Sportster section, so I recommend you call in there.
Reply With Quote
Old 08-01-2017, 04:48 AM
Ernie McKracken Ernie McKracken is offline
New Member
Join Date: Jul 2017
Location: In a barn
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts

Turning the air/fuel screw out(counter clockwise) on some carbs leans the mixture,lets more air thru passage,less vacuum pulling fuel from pilot jet.
Turn air screw all way back in (clockwise) then back out
1 1/2 turn. This is standard factory setting on most CV carbs. Try small adjustments from there 1/2 turns.
Make sure clean carb/good gas flow/ filter first.
Check web for info for best main/pilot jet size for bigger bore.
Reply With Quote
Old 08-02-2017, 01:32 PM
Zanthamos's Avatar
Zanthamos Zanthamos is offline
Senior Rider
Join Date: Feb 2015
Location: North Dakota
Posts: 330
Thanked 26 Times in 26 Posts

There is also 44 pilot jet size that you can go to as well. You are not restricted to just 42 and 45.
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
My 2013 XL883N to 1250 Conversion Story... xhellionx Sportster Models 44 08-28-2017 01:29 PM
Running lean after hammer 1250 basic conversion Lee Gibson Sportster Models 11 07-18-2017 02:41 PM
What heat range plug in a 1250 conversion hexnut Sportster Models 4 08-18-2016 09:47 PM
Need a little help with a 2003 1200 Rpatton Sportster Models 0 05-13-2016 10:12 AM
03 Fatboy carb issues tl1023 Softail Models 6 01-29-2016 02:23 AM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Featured Sponsors
Vendor Directory

All times are GMT -5. The time now is 06:15 PM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: