Finally coming to the realization of this happening. Any pros and cons to this?
I originally was just going to stick with a 98" bore with heads and get the crank done, already have cams and cam plate upgrade. (05 deluxe) Then my builder said "for a few extra bucks on the crank you can go for a 117/124 build." No need to pay for the jug bore anymore just buy S&S pistons and jugs. So whats the opinions here? I have heard some things about the cases becoming to thin with a 124 from an 88.

 

Plenty of 124s running on stock cases. However if you are worried about the cases you can run a 4 5/8 crank and cut the cases for a 4.060 piston (120"). A 117 would require the same size cut as a 124.

 

It's gonna' be somewhat substantially more than just a few extra $$$ to get to a big inch motor.

 

If i had the bucks id go big. Id be interested in problems as a daily driver. Built right maybe none. But i ride more days a year than not.

 

No issues with the cases, been boring those for years here.
Longivity?
We have a client in Syracuse, NY that has over 135,000 on his 124", almost 1/4 million miles on the chassis.......and that is his "other" bike.
Scott

 

JMHO but I would stop at 117"; that 4.125" x 4.375" motor is plenty strong and longevity shouldn't be an issue if you keep compression manageable; not a fan of the 4.625" stroke but that's just me. If I was going to 124", I would be looking at an S&S transplant.

 

done too many to count 124"`s with stock cases here,never had a problem

 

Kirby, just curious. What bore/stroke combination do you prefer for a 124 built around stock cases and what are the reasons you prefer that particular combination?

 

To interject, we pull the stops at 4 1/8" bore as the case bore ends up at 4.322".
We have built engines at the 4.250" bore dimensions with great results, just don't care for the case bore to be that close to the cylinder stud threads.
Master-blaster crate would be a G2 126".
Big hole, big head, BIG rpm.
Scott

 

Yup,
Want to smoke any street Harley you roll up on in your town?
Want to be able to go to any bike night and when someone says "yeah my buddy has a real fast Harley" and look at him and just shake your head and smile?
The 126" crate, stock and properly set up is the ticket. Ran one pretty much stock for 7 hard years-flawless.
I recently modified mine when it finally wore out and I will take it in its new form over the new 143" S&S crate ( in stock form) all day...