We had to machine the brake disc mounting surface down because the width of the 390 triples isn't wide enough to fit both calipers in alignment with the wheels. WE also had to grind the spokes of the wheel down to fit without hitting the backs of the calipers.Fantastic Project!!! A real SuperMono!
I'm curious about the wheel & tire change. It looks like once you put the fork-lowers on, the front 690 wheel and tire just drop right in. What did you have to do to get the 690 rear wheel + sprocket + disc to replace the stock 390 components?
how difficult was the installation of the 690 engine case and fitment to the rc390 chassis?I didn't get much time on the RC732R last year due to breaking my arm four days ahead of the opening round. We decided to do a few more upgrades on the bike over the winter though. Added 790 lowers to the 390 forks and dual rotors as well as dropped in a Suter slipper clutch to help get the power down. Here are a few recent pics just waiting for the racing to pick back up.
Here is a little insight into our in house special project, we jammed a big bore 690 into a 2015 RC 390. It was so succesful that it got 2nd in its first ever race! Here are a few specs to make you dream.
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- 290lbs wet
- 60ft lbs
- Uses all RC 390 spares
- 690 duke wheels and brakes 120/165
- Ride by wire superbike harness
- 3mm big bore making it a 732cc
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This is the donorThanks for the reply.. I bought a 2015 690 motor and am gathering the parts. Would like to get your advice/ expertise on the mods if you have time for a call to discuss.