107 from fuel moto seems to be the hot ticket if you are watching your budget. Just new pistons, juggs, tuner and slip on's get the job done.

117 requires much more financial committment, as so many other parts need to be upgraded to function properly.

It is the longer stroke that makes it more complicated and expensive for 117.

 

A well built 107" is good but having to do it over (which I did) I'd always go as big as possible and a 117" is perfect for the street. You already have the crank done which is half the battle! You'll need to have the cases bored to accept the larger pistons and cylinders. DON'T do it twice. Do it once and be done with it.

A built 117" will cost probably $6-7k for the motor to be done right-complete. You'll need bigger TB and injectors. Not familiar with the pipes but worse case they choke the motor a bit and cost you power.

The other alternative is a massaged 120R. Pull one motor out put the other in and still have your motor to sell for a grand or keep.

120R-$4800
Heads-$750
Crank-$1100
Pushrods, lifters, cams-$700

So about $7500 and you should net 140HP all day long reliably.

Either way add four to five hundred for a good clutch.

Personally I'd do the 120. It's just way easier, less complicated and the same money.

 

i say 117" or just bite the bullet and do the 124"

 

Call Star Racing. They are getting 130 Hp on a 107 Build.Turn-Key Package Price: $4,825 http://www.starracing.com/107UpgradeKit.php

BIG 107" UPGRADE KIT
The 107” upgrades offered by Star Racing delivers more bang for your buck than any other upgrade on the market. Our performance packages typically produce 120+ horsepower depending upon your current exhaust system. Installation of the kit maintains the appearance of a stock engine, but you will definitely feel the difference! Finally, your bike will be the fastest and your buddies will be scratching their heads trying to figure out what you have done. One work week turnaround (dependent upon throttle body replacement).
Call 1-800-841-7827 to make an appointment.


Included in the package:

• Cylinder Heads - Pro Ported & Machined
• Oversized Valves - Intake & Exhaust
• Bronze Alloy Valve Guides
• Performance Valve Spring Kit
• 600 Lift Cams
• CP +3cc Pistons
• Cylinders - Bored & Honed With Torque Plates
• Cam Bearings
• Race Tuner
• K&N High Flow Air Filter
• Big Bore 58mm HD
• Throttle Body
• Adjustable Push Rods
• All Necessary Hardware
• MLS Head Gaskets
• Fluids, Filter & Plugs
• Complete Labor
• Before & After Dyno Test
• Custom Dyno Map
• Other Options Available.

 

Ok you made a good point there, if the number check.

 

oh man my wifes gonna kill me regardless lol. im gonna have to sewhat i can squeez from my budget . not sure i can swing the 117 ouch

 

Stock stroke just add 4.125 cylinders to make a 117".

 

i have another question. i found a good deal on a set of 117 pistons and cylinders a guy bought and ended not using. how would my 555 woods and fuel moto level b heads perform with this? I dont see being able to swing a full build anytime soon but would hate to have my bottom end work done and not get cases bored. i can always add to the topend of motor as time goes on but bottom is kinda one shot deal

 

almost $5,000 invested and no mention of any bottom end work.... the op is pretty set on having the crank done.

 

yes I am. pretty mmuch my reason for this build to begin with. Peace of mind lol. Im hard on this bike andwant a solid platform