I really miss my old Motard.
It was a KLX 250 that had a big bore 400cc (ish) kit fitted to it by the previous owner. It went like stink and was a lot of fun.
After Seeing this link on another post http://www.mpfab.com/wr250/ it has gotten my creative juices flowing. I had a hand in turbocharging my mates FZR 400 so this is within my grasp.
Ok so Here's my plan.
Purchase a road legal WR450 from my local Yamaha dealer. I should have that done by the end of next month.
RGV250 17" wheels from bike wrecker. I'll have to machine up adapters to make them fit but should be ok.
I could just buy a kit from Vroom.co.nz but they're a bit cost prohibitive.
Front Brakes. RGV 250 Disc and stock caliper with custom made adapter. Or alternatively I may adapt a 4pot car caliper onto the bike. I've heard rumours of Nissan callipers working well, I have a pair of Series 4 RX7 4pot calipers in my stash of parts. I may use one of them.
Rear brakes RGV Disc and stock caliper.
This is where I will spend money on aftermarket parts.
I plan to re-spring the front shocks myself with slightly stiffer and lower springs and use slightly thicker oil. (15wt istead of 5w)
Rear probably similar deal stiffer and slightly lower spring.
I could spend a fortune going for a big bore kit but after the success we had with the Turbo FZR and seeing that very tidy Turbo-Tard WR250 on the previously mentiond link. I reckon this is the route to go.
I have a CT9 Turbo off my old GT Starlet. Unless I can find a smaller turbo in good cond for the rite price I'll use what I've got.
For the Turbo FZR build we got a steel shim made to lower compression. We simply bolted the head down with the shim sandwiched between 2 head gaskets. This lowered compression enough to avoid the huge detonation problems we were goin to have. That bike has just clicked over 1000km since the conversion without any problems.
Dunno how this will work on a Thumper though. I'll try this metheod to start with as I'd like to avoid getting a custom piston made as I am definatly on a shoestring budget.
I plan to make a pressure box enclosing the entire standard carby out of stainless. Jetting will be tricky but achievable. I'll keep the boost low (5-7psi above ambient) for the sake of reliability. The exhaust I'll fabricate also out of stainless. The Muffler I plan to use is a Boy racer spec dumpy stainless muffler meant to be fitted to a car. It has a 2" inlet (another unused item in the shed).
Any suggestions would be much appreciated. I'm interested to know of any wheel/brake combo's that people have seen used on WR's.
And before someone ask's no I'm not simply dreaming. I'm sourcing parts as I write this thread.
To me building and modifying cars/bikes/boats is half the fun. The pleasure of driving/riding a one off you built is the other half.
This bike should be heaps more fun than my 600 Bandit I've just sold. I can't wait to see the look on people's faces when they realise the monster I'm creating!!!