Wednesday, January 20, 2010

RD Racer Version 2.0


Last night I completed the teardown of the next RD400 "donor". The "donor" RD is a 1978 US model that was about 70% complete and barely running on one cylinder. I competed the teardown in about 2 hours and now the fun begins.


My goal for this RD is to go a bit more radical than I did with the first RD. I will be using a RZ350 front end (forks, triples, rotors & brakes), a modified FZ600 swingarm in the rear, and RZ350 wheels front and rear. I will encase the bike in a 1986 TZ250 full fairing and bodywork. The engine will not be as heavily modified as the previous RD project and I'll keep the stock Mikuni 28's with a 2 into 1 intake. For the ignition I'll be using a generation 2 Nuetronics unit and the expansion chambers will be old Stage-II units.


After I degrease the frame and stock swingarm, it's off to the sandblaster and a couple of hours with the grinder. While the frame is being sandblasted I'll start the teardown on the engine.


This project will require more fabrication than the previous RD, but I am in no hurry to complete the project. If everything goes perfect (that's not going to happen), I could be done by summer.

Friday, January 1, 2010

All the King's Horses & All the King's Men.....


The RD lives again, all crash damage repaired and she is better than ever.... Work done included....

New fork with pneumatic adjustment
New Woodcraft clip-on's
New grips
New stator cover - Polished aluminum finish
New left-side shifter rear-set
New license plate hanger
New fuel tank & petcock (No dents, but it sure is BLUE!)
New left-side chain adjuster
New front fender mounts
New clutch lever

I added a nice CNC machined front rotor and moved the previous drilled front rotor to the rear brake. A nice touch and the CNC'ed rotor offered a minor increase in thickness.

After everything was bolted back together and buttoned up, it's time for a test ride! The test ride went OK (I didn't hit any stray dogs) , but I did uncover some issues....... First I noticed that the engine is running rough and then I noticed the sweet smell of pre-mix gas. A quick inspection shows that the petcock gasket is leaking and the right - side carb is dumping gas from the overflow. The new clear gas lines expose the grit and trash that washed out of my new "clean" tank.

Next steps...... pull the tank, flush it AGAIN and seal the petcock better. Then it is time to rebuild the Keihin PWK's and take another look at the ignition timing. My current timing settings require that I run 110 octane VP race fuel at about $7 / gallon.... OUCH!

I have a modified FZ600 swingarm coming in the mail (thank you eBay and Jibco520). Can't wait to play with the swingarm configurations. Stay tuned for some swingarm experimentation!