Capable Kawasaki Ninja EX650r.

Built and raced by Retro Rocketeer he ported the head, milled the cylinder and head some. He ran the Versys intake cams and Ninja exhaust cams in different degrees and combinations. It had great midrange acceleration. He says, “Ultimately, its still easier to build an SV motor than an EX650r motor. There’s just a lot more R&D in the SV”.  I fully agree, but I feel this could change if more US guys started to run the little ninja 650.  It takes a bit more work, but has proven itself in circle track, I am sure it can prove itself road racing. He chose the Ninja because He liked the chassis setup. The balance and distribution suited his riding style and preferences. He also got a smokin’ deal on it, which never hurts. The Versys/Ninja motor’s biggest weakness are the connecting rods. You need new rods at the end of every season if you don’t want to buy after-market t race rods. The other huge weakness is the radiator.  Radiators on the EX are barely large enough for trackdays with a stock engine, let alone the added output of more compression and more flow.

Kawasaki Ninja 650r Kawasaki Ninja 650r Fairings removed Kawasaki Ninja 650r fairings removed

The front wheel and discs are 08 EX650R. Forks and brakes are 06 ZX6R mounted in 04 ZX6R triples. In current form, it weighs 372lbs with 1.5gal in the tank. Unfortunately, I suffered a severe crash at the end of my last season and opted to sell the bike. I wanted to install a Versys swingarm eventually, but was always a day late on bidding.


Riding motorcycles and wrenching since my preteen years, I have moved from motocross to street bikes. Being a teen back in those days it was tough to get me off of the bike. Now days even though I am very busy being a dad I still have my weekends and go to the track to race and on occasion will do a track day or two.

2 thoughts on “Capable Kawasaki Ninja EX650r.

  • March 26, 2016 at 6:10 pm

    My name is Jason…it’s super late on this 650r but I want another one if I can afford it and u still have it. I have some questions about this bike build of yours

    • March 26, 2016 at 9:12 pm

      The bike that was featured is probably sold, and my personal 650r is not for sale. I am sure we can answer any questions you might have about my 650r build or Jons SV650 build. I am sure the questions you have are some that others have as well.


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