engine life of a 120

[ridgerider]

i ride daily  high mileage means alot, my 1999 has around 140,000 miles no problems,

friend has a 2011 street glide that the dealer put a 120 Jim's motor  in for him. with a 21" fancy mag wheel and a few other add ons..bottom line is it has 2000 miles on it, final tune  hp 127 tq 130

i am thinking of it for my new daily rider  approx cost of 25,000   question is how long will it last me being ridden normal i am a old gray beard but going fast is nice

thanks  spring is here

[cycleman11]

I think you already know the answer, you won't get 140,000 out of it.  There's a reason the old engine is lasting so well, and its called a lack of stress.

There are no free rides when it comes to hopping up an engine, you get to play but you have to pay, just sooner rather than later.

[dynablack07]

As the HP to cubic inch ratio exceeds 1.0, engine life decreases ( generally )
The 120 piston will have more likely to rock in the cylinder due to short skirt length vs bore..
A  120 rear tire will never last as long as a EVO.. why should the engine ?

[Durwood]

I would put a SE 120r in it, they are proven to stand up to some pretty aggressive riders.

[tomcat64]

 
we will NOT install the jim's motor,, too many problems.. we have done atleast 12 120r's and have had 0 problems,,  all that being said,, logic dictates that a motor with double the HP of a stock one will not last as long as as long..

[ridgerider]

i was wrong it is Harley's version of the 120, but if i cannot git 100,000 out of it its to pricey for me

[Durwood]

I'd wager it will make 100k miles easy, after looking at Strokers when he had it apart at 30k...

[Ohio HD]

If you don't abuse the motor, I can see it might go 100k. I've owned 4-5/8 stroke Shovel motors that went well over 60k before needing any attention, that being a top end freshening up, and they are, well, Shovel motors.   

And Evo or TC with a 4-5/8 stroke, I can see 100k if it's not run to death.

[FXDRYDR]

Whether or not it goes the 100K miles - you'll sure get there quicker!! 

[remington007]

The one i installed made it just over 10K. Lifter rollers and cam lobes went south.
Was in a FL with syn 3 oil. First year production engine though.