Engine swap question
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Tourer
Joined: Jul 2014
Posts: 426
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From: Lake Wales, Fl
Engine swap question
A buddy of mine has a 2005 Softail - 88 cu in with a carburetor & a 5 -speed. He was wondering about putting in a 103/ 6 speed - swapping the whole package, engine, trans, & primary.
Question # 1 Will it bolt in? or would we have to get creative?
Question #2 What about running the 103 on a carb? any issues with that?
Thanks, Eastcoast Jim
Question # 1 Will it bolt in? or would we have to get creative?
Question #2 What about running the 103 on a carb? any issues with that?
Thanks, Eastcoast Jim
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,068
Likes: 11,086
From: San Diego, CA
I have never done that swap before, but I have swapped and engine before, so here's a couple thoughts on it...
"Question 1: Will it bolt in? or would we have to get creative?"
First you need to make sure you use a 103" "B" engine, primary, and trans... the touring "A" engine, primary, & trans combo will be much different..
Just looking at the parts list, I suspect it will NOT be a direct bolt-in swap... but how creative you will need to get I cannot guess... they seem to match up a little bit... For example, using a Heritage Classic for comparison; 2006 Heritage has a different frame number than the 2012 Heritage 103" - 2006 frame #47008-00C / 2012 103" frame #47173-11BHP. The seat posts and rear fork (swing arm) have the same part numbers, but with different suffixes- 2006 seat post #48868-00 / 2012 103" seat post 48868-07 & 2006 rear fork #47573-00A / 2012 rear fork #57573-11BHP.... so they have to be very similar, if not the same...
You can go to an online parts site to do some research. Look at the two different years models. Compare your 2006 and the same model 2012+ w/103" engine to check the parts numbers and pictures of them for similarities and/or differences...
"Question 2 : What about running the 103 on a carb? any issues with that?"
With the proper ignition, intake manifold, carb mounting system, fuel delivery system (petcock, filter, etc), and any needed sensors, I don't see any problem. I know that an OEM CV40 carb should handle the horsepower of up to a Stage II 103" engine... IIRC.. they are good to 110ish HP.. I believe them to be a very good, under rated carb....
As a friend you used to say.... you can do just about anything with enough time and enough money... not sure how much of each this swap would actually take.... hopefully someone can chime in with specifics about this swap...
Good luck...!
"Question 1: Will it bolt in? or would we have to get creative?"
First you need to make sure you use a 103" "B" engine, primary, and trans... the touring "A" engine, primary, & trans combo will be much different..
Just looking at the parts list, I suspect it will NOT be a direct bolt-in swap... but how creative you will need to get I cannot guess... they seem to match up a little bit... For example, using a Heritage Classic for comparison; 2006 Heritage has a different frame number than the 2012 Heritage 103" - 2006 frame #47008-00C / 2012 103" frame #47173-11BHP. The seat posts and rear fork (swing arm) have the same part numbers, but with different suffixes- 2006 seat post #48868-00 / 2012 103" seat post 48868-07 & 2006 rear fork #47573-00A / 2012 rear fork #57573-11BHP.... so they have to be very similar, if not the same...
You can go to an online parts site to do some research. Look at the two different years models. Compare your 2006 and the same model 2012+ w/103" engine to check the parts numbers and pictures of them for similarities and/or differences...
"Question 2 : What about running the 103 on a carb? any issues with that?"
With the proper ignition, intake manifold, carb mounting system, fuel delivery system (petcock, filter, etc), and any needed sensors, I don't see any problem. I know that an OEM CV40 carb should handle the horsepower of up to a Stage II 103" engine... IIRC.. they are good to 110ish HP.. I believe them to be a very good, under rated carb....
As a friend you used to say.... you can do just about anything with enough time and enough money... not sure how much of each this swap would actually take.... hopefully someone can chime in with specifics about this swap...
Good luck...!
Last edited by hattitude; Jun 16, 2020 at 01:53 PM.
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