Interesting. JIMS works only through the dealerships and I thought he was the sole supplier to the MOCO on these big motors.

I'll go check it out. Thanks!

~Joe

 

While several firms make copies of Evos and TC88s (S&S Evo here), it is true Harley have protected their design rights in some way and JIMS are the only firm authorised to build alternative TC96-style motors. However Harley themselves make the 120R. Interesting they should tell us it is intended for track use, but the most popular threads on HDF about using them are in Touring!

A distinguishing feature of the TC96s is their internal oilways, ie no external oil pipes and this seems to be a feature Harley is jealously protecting. While we have representatives from many firms on HDF it is a shame there is nobody representing H-D, so we can learn such things from the horses's mouth!

 

The SE 120R is also based on different features than the Jim's 120. It has a different bore, different stroke, different rod length and I am sure other variations.

As to use in the Touring bikes, since the engine was the basis of the AHDRA draggin baggers class, it is a natural that the majority of the engines have ended up in touring bikes. Certainly MOCO wouldn't be doing an end around on the EPA to get these engines on the street would they

Oh and mine is working very well in my 06 Street Bob too,

 

is the crank in the 120R welded?

everything I'm reading says "press fit"....which to ME means cutting corners.

~Joe

 

I hear that the Jims engines are built beefier than the SE 120s...


Having said that, I wish I had an SE 120!

 

Having said that, I wish I had an SE 120!


Yes........... You Do!!!!!

 

I inquired last summer about a Jims 120 or 131 (I was considering both) and they have a stricter maintenance schedule. (As directed by Jims). I was told at the time they didn't recommend them for general riding (touring). So I stayed away. The Jims 120 can be upgraded to a 131 by a bore kit. (I saw in the Jims catalog).

SE 120r has different bore and stroke. But all HD parts. I figured if there was a failure while out on tour (knock on wood) HD parts would be much easier to order in for the repair.

My thoughts though...

First 2Up ride today. Wifey liked the bump in power. Delivered to Lonewolf for proper tuning and a good going over.

Thanks Lonewolf for helping me out. Your shop is pretty awesome.
Good choice in your ride too... (Vivid Black - FLHX).

 

anyone?

 

Sure. Check with John at Darkhorse. He only welds them for the customers peace of mind.

 

Press fit crankshafts require a very high degree of precision for the mating parts. That ain't cheap. Velocette did them that way for decades. It means that within the available width of the crankcases there can be a much larger contact surface area between flywheels and crankpin, compared with bolt-up designs.

Welding a pressed crank is rather like putting flanges on railway rolling stock wheels. The railway engineers only put them on to keep passengers happy, but they don't need them to stay on the rails!