SE 120cube motor
Outstanding HDF Member
Joined: Aug 2009
Posts: 2,938
Likes: 4
From: NC
aside from selling the old engine, I looked at the 120R and what it would take to get it operating efficiently and found it to be about $8+K (me doing all the work) and for $5K I can get similar results with Star Racing doing the work on my current engine. So am opting for that route myself.
Last edited by parts eeter; May 28, 2011 at 12:18 AM.
Road Master
Joined: Oct 2008
Posts: 886
Likes: 6
No actually $8K was for the motor, TB, etc. with me doing the install. Then I could sell my engine. But if I had someone else do the work it would run closer to $10K (still prior to selling my original engine). When I talked with Star Racing they said I could get around 120s (HP/TQ) with them doing the work on my current engine and it would be $5K out the door. Which is why I decided to go that route.
Thread Starter
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Seasoned HDF Member
Joined: Dec 2010
Posts: 7,736
Likes: 1,524
From: Coromandel Peninsula New Zealand
This will be around 135HP, they give 140 with a 62mm throttle body but the air cleaner options are limited for road use so we went with the 58mm body and I will upload the dyno printout once it is run in.
So, we had a bit of an issue because you have to fit the rotor and compensator assy before the inner primary but we got a bit carried away before dinnerand did it in the wrong order.
Once fed and watered we were a bit more mellow and took our time. While the boy tightened the front motor mount I assembled the injectors into the manifold, this requires that you use your old fuel pipe.
OMG that is a huge intake!!!
Inlet valve on rear pot
"Special Tool" for tightening manifold studs
In use
New compensator assy, its way beefier than standard
Throttle body goes in...its was a very tight fit in the gasket
You reuse your old oil pressure switch
Throttle cables etc are hooked up
Special tool for realigning head steady :-)
Air cleaner backplate pulls the throttle body fully into the manifold rubber
Now that is a big as air filter!!!
Too excited to fit the exhaust heat shields before firing her up
Started first pop and idled perfectly, like it had been in there for years....this was a really easy job to do and it took about 5 hours...gonna do a quick road test tomorrow before booking it for a dyno, customer coming on monday to tell me what pipes he wants to use.....it is freaking loud, when I started it the neighbours thought armageddon had arrived.....I just wanted to have the bike's babies...its totally badass ;-)
So, we had a bit of an issue because you have to fit the rotor and compensator assy before the inner primary but we got a bit carried away before dinnerand did it in the wrong order.
Once fed and watered we were a bit more mellow and took our time. While the boy tightened the front motor mount I assembled the injectors into the manifold, this requires that you use your old fuel pipe.
OMG that is a huge intake!!!
Inlet valve on rear pot
"Special Tool" for tightening manifold studs
In use
New compensator assy, its way beefier than standard
Throttle body goes in...its was a very tight fit in the gasket
You reuse your old oil pressure switch
Throttle cables etc are hooked up
Special tool for realigning head steady :-)
Air cleaner backplate pulls the throttle body fully into the manifold rubber
Now that is a big as air filter!!!
Too excited to fit the exhaust heat shields before firing her up
Started first pop and idled perfectly, like it had been in there for years....this was a really easy job to do and it took about 5 hours...gonna do a quick road test tomorrow before booking it for a dyno, customer coming on monday to tell me what pipes he wants to use.....it is freaking loud, when I started it the neighbours thought armageddon had arrived.....I just wanted to have the bike's babies...its totally badass ;-)
Last edited by Spanners39; May 28, 2011 at 03:26 AM.
Thread Starter
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Seasoned HDF Member
Joined: Dec 2010
Posts: 7,736
Likes: 1,524
From: Coromandel Peninsula New Zealand
Took it for a brief ride, the power commander is still set up for the previous motor but it runs OK.......some serious power there now but its indecently loud.....we are talking earthquake inducing!!!!!
Hopefully get it set up with a runnng-in map by the weekend and then its showtime!!!
Hopefully get it set up with a runnng-in map by the weekend and then its showtime!!!
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Seasoned HDF Member
Joined: Dec 2010
Posts: 7,736
Likes: 1,524
From: Coromandel Peninsula New Zealand
Well we changed the pipes to S&S slip ons with standard headers because it was just too loud....like a drag car on the start line.
Then I trailered it to the H-D dealer in Auckland for a dyno set up at running in speeds....3,500 RPM with a bit of overlap.
It runs sweet as now and I rode it back from the dealer and scared the ***** outta myself....its really nice to ride, feels torquey and beefy, is not too intractable about town and goes like a cut cat when you crank it....I scared myself a few times, once when the lights changed to green as I approached them and I cranked it in 2nd and nearly went off the back.
Its definitely not a bike to ride when not completely sober or you will likely die.
Gotta put 2k kms on it for the owner and then its back for a proper dyno run and I will post the numbers and printout when that has been done.
All in all, at this point in time I would say it is the only motor upgrade worth bothering with, the 103 seems like a moped in comparison!
I don't usually approve of tuning Harleys...even though I do heaps of them.....but this......this is the real deal........
Then I trailered it to the H-D dealer in Auckland for a dyno set up at running in speeds....3,500 RPM with a bit of overlap.
It runs sweet as now and I rode it back from the dealer and scared the ***** outta myself....its really nice to ride, feels torquey and beefy, is not too intractable about town and goes like a cut cat when you crank it....I scared myself a few times, once when the lights changed to green as I approached them and I cranked it in 2nd and nearly went off the back.
Its definitely not a bike to ride when not completely sober or you will likely die.
Gotta put 2k kms on it for the owner and then its back for a proper dyno run and I will post the numbers and printout when that has been done.
All in all, at this point in time I would say it is the only motor upgrade worth bothering with, the 103 seems like a moped in comparison!
I don't usually approve of tuning Harleys...even though I do heaps of them.....but this......this is the real deal........
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Road Captain
Joined: Jun 2007
Posts: 644
Likes: 5
It all boils down to that one sentence. Good stuff, was fun reading through the install. Thanks for the write up and have fun breaking it in sober.