All 2st Scalvini 2 Stroke Exhaust Systems

Yep, it all depends on what you want. If you want it to scream like a 125 then their kit is probably the way to go. If you want more usable power everywhere else then the 165 is the way to go.

Oh,I think the WB165 is the best bang for the buck,just interesting to see what is out there.
What is done to the bored cylinder with the wb165? is it plated,if so with what?

They are in my backyard but they did me so wrong I don't care if their kit shoots fireballs from the silencer. I'm not in to trashing and airing dirty laundry but they had their chance to make it right and balked. I'll be looking into a 165 with a rev setup. Wanna race the 144 at least once, will pull trigger in spring.

Do tell if relevant to potential shoppers....

I am told that the 139 is the real all around deal. The 139 is a stroker motor if I am not mistaken. I am planning a 155 build for the new year. Since the CR comes with the 144 kit the 155 stroker is a GREAT deal. I did a little seat time on a 144 that was a stroked and bored 125 several weekends ago and the difference in low end compared to the all bore 144 was huge!

Dang, sorry to hear that. Who is it that is doing the 165 kits that everyone talks about? Sounds interesting.

Wallybean or Walt
Refer earlier post and many other threads. Search 165

Yes John look into the WB165 it's not a stroker so it's a simple bolt on deal. Many many CH members are running and hard racing the WB165 kits. It's proven to be the real deal.

Curt,

I re-port the cylinder both top and bottom, exhaust port and polish the exhaust port. The goal is to maintain the same port timing as the 125 cylinder. When these cylinders are bored, even the 144 from the factory the rear and front transfer and the exhaust port are lowered. Especially the rear transfer. By pre-porting before boring and plating it only takes some clean-up post re-lining. The oem 144 cylinder can gain some by raising the ports to original 125 height. This is mostly the rear transfer. I then re-cut the power valves both face and bottom. The head is machined to fit. With the gaskets, piston kit, o-rings and top end bearing provided it is bolt and go.

You sir obviously know your stuff. This is exactly what Eric Gorr told me hob-knobbing over drinks at a wedding recently. Has anyone tried the Scalvini with the 165?

Easy there Texas it wasnt quite like that , and my dynaring was slipping.

Good debate, and I enjoy expanding on the options. I've not been here long, but can tell early on that Wally's rep is solid and i would trust him in a minute. I'll probably do something to mine when it's time for a piston, as I like to tinker. That said, I'm unsure if a smooth tractor is what I want. I sold a fire breathing Slavens ported 300 to grab the 144. The KTM would pull you through anything at 5 rpm and was beyond easy to ride. I intentionally went polar opposite in hopes of adding a spark to my dirt interest, so trying to give the small bore a big bore character just doesn't make sense for me. If and when, I'll be after "more of the same"....

Comparison of pipes on same bike would be good

I could possibly come up with w pipe to test on your 165. Let's get past Christmas and revisit.
Help me out, Up-tote 167??? Are you referring to the builder?
Thanks!

I couldn't get the carbon silencer to fit (w/scalvini pipe) on our '13 CR125. Frame mount is about an inch beyond reach of pipe mount, included mount parts were incomprehensible in relation to frame mount. Had to shelve it as bigger projects took over, but gonna take another attempt here soon. Anyone know if subframe/mounts changed since '12?

I am not aware of any changes to anything on the 13 other than the grips.
Does it look anything like this??? This is my 12 with carbon in place.