You know making a four cylinder bike smaller than 600 doesn't make a lot of sense. The modern twin does it better for less money, it's cheaper,most likely smaller and lighter. The reason they made 400 cc four cylinder bikes, is because some countries like Japan had some kinda 400 cc limit.
A 700 to 800cc twin will not out-corner a similarly built 400, in my humble opinion. A stock RD 250 is still the best cornering bike I've ever raced.
The 400 four cylinder is kinda of in a funny class, it has the power of a larger bike, but has a wider heavier motor,so it's not going to handle like a 400cc twin.
The R7 is only $500 cheaper (the Aprilia is about $2K more). Both the R7 and ZX-4 are listed on their websites to have a wet weight of 414lbs. I believe this 400-4 will be on par with the performance of the top MA Twins bikes once it's in full race trim.
Yes, but that’s the best comparison for relative performance. Plus, those are the bikes it will compete against in some of the club racing classes.
The 660 Trident might be approved as it sure looks to be right in the sweet spot for the class engine wise - chassis and aftermarket support wise - not so much...
they are comparing them in performance as if they could compete directly with twins. Which they can’t. Apples to oranges and all that jazz.