MotoAmerica changes for 2018

Rule book says valve diameter has to remain stock

2.8.8.2
k. The valves may be replaced but the valve face must remain the same diameter as homologated.

I would guess 85 to 90 hp will be ballpark for the smaller twins in this class....depending on your dyno.

 

Thanks for the correction. I remembered thinking Superbike rules when reading about the class and guess I assumed no valve limit.

 

Yeah, it looks like they've kept stock bore, stroke and valve diameters in an effort to ensure some balance of performance. I think the smaller twins will all be fairly equal in terms of engine power. Getting the chassis set up dialed will be crucial.

 

That monstrous 180/60 spec tire is probably going to require SV racers to run a long wheelbase for swingarm clearance.

 

Will they require SVs to run the 180/60?

Does Dunlop have a 160 Slick?

 

They have a 165 slick which works on 4.5-5.5 rims. I've heard the 180/60 slick will be the twins spec tire. The FZ07 and Duc 800 come with a 5.5 "rim. The EX650 and SV will have to go to a 5.5 for the spec tire.

 

I'm putting together a 2017 Ninja 650 right now. It looks like the ZX-6 rear wheel will work with just a bearing change and possibly modified spacers. The ZX-6 front end and 2016 ZX-10 rear shock bolt directly on. The 636 body work also fits decently, but you have to build some custom brackets.

 

http://twfracing.com/PartsPages/636wheelconv.html

 

It fits 1st gen sv.

 

I believe stock valve diameter .

 

stock like this...?

 

Build a few. I would love to see Kawasaki kick butt in that class

 

But then reality kicks in lol

 

LMAO. Kinda funny lol

 

KTM is quoting the price of the 790 at around $11k, per A&R


Sent from my iPhone using Tapatalk

 

So that means you'll be able to get a left over 2018 model for $8K. When they're all still sitting there on the showroom floor in 2020.

 

We ran the 180/60 at Willow Springs last weekend and we had it on one of the bikes at Las Vegas at the last round.
The tire warmer is a snug fit, but no issues other than that.
You will not ride off the edge of the tire, like you can with the 165 on a 5.5’ rim.
It got down to 33 Saturday night, so it was NOT a good night to run out of propane to heat the trailer ...

 

lol I love a 190 on an Sv....

 

Never heard of anyone running a 165 on a 5.5" rim... the stock SV 4.5", yes.

 

5.5" is the recommended rim width for the Dunlop and Bridgestone 165 slicks.