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[DCFIREMANN]

The fact is nobody has seen this engine yet, it was just released, when I called Chicago HD they said they had none in yet and weren't sure when they would start shipping.  But everyone is comparing this to a Jim's and it's not a Jim's.  From the description.

Hand assembled alongside Harley-Davidson’s production
Twin Cam engines at the Pilgrim Road Engine Plant in
Milwaukee, these race-use engines feature only the finest
Screamin’ Eagle components:

Now while that may not scream reliability, it does make it known that this is not a Jim's engine.

Folks who work on them see the problems with them, why, because nobody brings them a bike thats running great and they want it fixed.

This may be a newer version of the Jim's 120, if not it has been in production for a few years and sold at the dealerships!

Be Safe

THE DAWG

[HD Street Performance]

Not related to the Jims
4.060 X 4.625
Stock cases, no Timken, SE Jims crank, 10.5/1 pistons, specially ported 110 head castings, SE266 cam.
$5,700 plus you add the right TB and accessories to make it run.

[ultraswede]

Is it so hard to realize that the 120r is a Harley engine, not a Jim's?
 
Some facts,

The Jim's 120 has;
Bore x Stroke  4.125" x 4.500"
Jim's own cyl stud spacing, and therefore their own cyl heads and cylinders.
Has Jim's their own crank case??

The 120r Harley engine has;
Bore x Stroke 4.060" x 4.625"
Standard crankcase and stud spacing.

If the 120r is reliable or not remains to be seen.

But to dismiss the 120r just because a different manufacturer has (had)
some problems with an engine of the same swept volume is plain wrong.

edit,
Sorry  for repeating the facts Deweysheads, you beat me to it.
And the 120r comes with 10,5-1 pistons according to the SE catalogue.

[DCFIREMANN]

ULTRASWEDE the problems with the Jim's 120 motors of the past were LIFTERS and CRANK ASSY!!!!! If you do not have a pinned and welded crank in these heavy bikes, you are looking for trouble. Not to mention no timken bearing.

Be Safe

THE DAWG

[SBB]

You must have paid for an extended warranty. If that is the case you have spent more than I have.

The facts are what they are. Go talk to some people that have a Jims 120. Axil does not live on here, so you may want to wait for him and IF YOU THINK THE JIMS MOTOR IS A VIABLE OPTION YOU HAVE HAD ME FOOLED FOR A FEW YEARS!!!!lol.

Be Safe

THE DAWG

You must have paid for an extended warranty. If that is the case you have spent more than I have.

Fact, No extended warranty Since that IS the case I have spent less on my 110 w/39K miles than you have on your 103 based on your comments above.
Imagine that?

The facts are what they are.

They may be what they are but where are they in this thread? I have yet to see any concerning issues with the 120 be it the old 120 or the new one.

Axil does not live on here,

True, so true but you have his cell and you and him are buddies so we are still wondering why he would say,

 In a word - junk!!!!

And thanks Don and ultraswede for clearing up the old VS the new 120 concerns.!

SBB

[SBB]

ULTRASWEDE the problems with the Jim's 120 motors of the past were LIFTERS and CRANK ASSY!!!!! If you do not have a pinned and welded crank in these heavy bikes, you are looking for trouble. Not to mention no timken bearing.

Be Safe

THE DAWG

Thank Dawg for explaining the above.
Did you have those issues with your Jim's 120?
I put 9K miles on mine and it produced 140/141.
My experience with the one I owned was a good one.
The frame sucked but the motor was a beast!

SBB

[Fired00d]

If there is anyone else like myself that was wondering the specs on this motor see attachment.

 
Ride Safe,
Fired00d
 

[DCFIREMANN]

Damn Chip I forgot you had a 120 motor in the bike that mysteriously disappeared. But if I remember correctly you went into that motor for the need to try to be the fastest on the board. You are right though, that rolling chassis would not let you!!! So I would think if you were producing that kind of HP that motor had a welded crank and a timken bearing assembly in the lower end. If not you would have not got to the 9k mark. That is two of the differences between the Jim's of old and now. If I was going to go with a 120 inch motor I would have Zippers build it for me!!!!!!

As far as my 103 motor goes I have put very little money into that motor.  Since I am not into everybody's business I really don't know what has been done to your 110 or how much you have spent on that motor, and really don't care!!!! If anyone on here is thinking about a Jim's 120, I think they are smart enough to look into the construction and parts that are used in these motors. Oh and check on the warranty procedure After that I think they can make their own intelligent decision on rather to buy or not!

Be Safe

THE DAWG

[DCFIREMANN]

If there is anyone else like myself that was wondering the specs on this motor see attachment.
Ride Safe,
Fired00d
 

Thanks DOOD!!!!!

Be Safe

THE DAWG

[HD Street Performance]

ULTRASWEDE the problems with the Jim's 120 motors of the past were LIFTERS and CRANK ASSY!!!!! If you do not have a pinned and welded crank in these heavy bikes, you are looking for trouble. Not to mention no timken bearing.

Be Safe

THE DAWG

You Betcha!
Lifters are stock I suppose not Jims

[hard10]

This may be a newer version of the Jim's 120, if not it has been in production for a few years and sold at the dealerships!

Be Safe

THE DAWG

Mike, not sure why you're getting your panties in a wad over this. Clearly the 120R is a new engine.

[1abastarsmda]

ULTRASWEDE the problems with the Jim's 120 motors of the past were LIFTERS and CRANK ASSY!!!!! If you do not have a pinned and welded crank in these heavy bikes, you are looking for trouble. Not to mention no timken bearing.

Be Safe

THE DAWG

Response #10 shows the engine cross-section with labels.  SE-266 cam with Timken Bearings

[1abastarsmda]

My guess is that we are going to see 120" engines in Screamin' Eagles to come, maybe by next year...after a few of these are out there and they see what kind of problems they really have with them...with the guinea pigs that buy them.  We're seeing the displacement moving upward on the other models, and once they put 120's in the SE's, then we'll see standard models sporting the 110's.  It doesn't seem like any different pattern than what they've been doing over the years...bigger engines.  80", 88", 95", 96", 103", 110"...why not 120" in the SE's.  This is more like the build they should have had already.  But then these are listed as race only and they'll have to find a way to keep them street legal to equip a factory bike with them.  Just a guess, or maybe just some sheer optimism.

The specs sure don't look like the Jim's at all.  I'll be very curious about the reliability on these 120's and very tempted also.  I do think it's one of those upgrades that would make more sense directly at the time of purchase, if the same deal holds true with it being covered with the regular factory and extended warranties, like doing an engine build with the SE kits at time of purchase.  It wouldn't be a big pricing deal if you have a brand new 110" to sell to someone once you are done.

[sadunbar]

My guess is that we are going to see 120" engines in Screamin' Eagles to come, maybe by next year...after a few of these are out there and they see what kind of problems they really have with them...with the guinea pigs that buy them.  We're seeing the displacement moving upward on the other models, and once they put 120's in the SE's, then we'll see standard models sporting the 110's.  It doesn't seem like any different pattern than what they've been doing over the years...bigger engines.  80", 88", 95", 96", 103", 110"...why not 120" in the SE's.  This is more like the build they should have had already.  But then these are listed as race only and they'll have to find a way to keep them street legal to equip a factory bike with them.  Just a guess, or maybe just some sheer optimism.

The specs sure don't look like the Jim's at all.  I'll be very curious about the reliability on these 120's and very tempted also.  I do think it's one of those upgrades that would make more sense directly at the time of purchase, if the same deal holds true with it being covered with the regular factory and extended warranties, like doing an engine build with the SE kits at time of purchase.  It wouldn't be a big pricing deal if you have a brand new 110" to sell to someone once you are done.

  Where exactly do you race a 120" Twin Cam motor?  

[1abastarsmda]

  Where exactly do you race a 120" Twin Cam motor?  

The same place I race my 110"....up and down every road I'm on.  I may not be racing anyone else or breaking any records, but it sure is a helluva lotta fun!  I'm all up for a little extra oomf.