Has anyone installed the S&S 128 big bore cylinder kit or the Suburban HD 130 cylinder kit? I'm thinking of adding this to my stage IV kit but wants to ask if any members had any experience with either. The one thing of note is the S&S is at 11:1 and the Suburban is either 11.4:1 or 11.8:1 depending on gasket.
https://www.sscycle.com/products/m8-...e-x-45-stroke/
https://www.suburbanharley.com/wisco...linder_kits-m8

 

I was at a dyno shootout sat.
One bike had fuel moto's 128 made 136 hp good numbers

took mine a suburan 130 made 147 hp both you can ride anywhere
so far mine has just over 500 miles in a week oil temp highest i seen is 203 oil pressure crusing at 80 is 44 psi.
I am leaving for a trip to the smokey mountains in a week plan on doing a couple thousand miles in 5 days not worried at all. I just changed the oil looked great.

Suburan is the way to go they use great parts and stand behind their product

 

Thanks for the feedback. What’s the rest of your setup? Mine is stage IV (all HD products) with smart tuner and fullsac headers/baffles so I would just be swapping cylinders and pistons.

 

tts 250 cam
d&d exhaust
ward intake
hand ported stock heads
adjustable rockers
fueling pump and cam plate
64mm throttle body

 

I'm sure you were glad to see that. Looks like your bike is finally doing what you have been wanting. That's a good comparison with both bikes on the same dyno in a relatively short amount of time.

Don't expect to get the results he has by just swapping cylinders and pistons. You'll get some gain, but I can tell you it has been a process for DRBUICK to get to this point. I think to some degree the kit he is using was being developed on his bike. If you're going to change out the pistons and cylinders you might as well do a good cam and a real tuner while you're at it. Then you will see some real gains.

 

What was your torque number on this?

Do you have the dyno sheet?

Very nice HP.

 

144 tq

dyno sheet i posted last week