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Here's my little RD. Bought it last year, it was an abandoned movie prop and had a load of bits missing. I rebuilt it, ported the 250 barrels and made some pipes for it but it was a bit all or nothing. This year, I wanted to lose some weight and give it a bit more grunt. I've made a box section swingarm that I've not fitted yet, which is RD400 length and half the weight of the original. It's also lost a bundle of rotating mass thanks to M in SC's front brake conversion, which along with stiffer springs and emulators is a terrific bang for the buck. I know it's not the shiniest, but it really does go well!

Just got to fine tune the jetting, then I'm off for a good 3 day thrash around northern cal. Next year, I fancy  making it into a 4mm stroker, with some cylinder mods to facilitate more advanced porting ideas. I might make some billet triples too as the stock ones weigh a ton.

Cheers.

Set up now:

- Chinese Cylinders, ported by me, raised / widened exhaust, raised transfers and redirected a bit, widened and raised boost and redirected. Decked and pegged on centre for RD400 gaskets. Pro-x pistons, set around 2.5"thou clearance.
- 250 heads recut by me, 45% squish, bath tub shape dome, 22cc total volume, 0.95mm squish. Seems to run 91 pump gas fine, at 145(ish) psi.
- Pipes made by me from a Mick Abbey (thank you Mick!) design for around 8.5K peak. Made in 22ga steel, weigh 3.5lb each, inc silencers.
- Banshee cross over intakes with the stuffers removed, 6mm reed spacers to lower crankcase compression a bit
- stock cages, opened out with trimmed yz85 reeds.
- HPI ignition, set 1.8mm btdc.
- Racetech straight rate springs, with cheapo xs650 emulators and 7.5wt oil.
- 520 Chain conversion.
- M in SC, FZR600 disc / r6 caliper conversion from dxf files - cut on a waterjet at Send Cut Send.

Apologies if this has been done to death. Is there a difference in main jet sizes running the Dave F mod vs stock?

I'm just about to start up my little home grown 350 - it has stock high tops, stock needles, y-boot with UNI filter, ported cylinders (exh raised a little and widened to 68% of bore. Transfers and boost raised and widened.) I recut the 250 heads for about 45% squish and a total volume of 22cc, squish is 0.95mm. Pipes are home made by me for about 8500 peak from a Mick Abbey design.

I've got a 32.5 pilot / 230 main in it at the moment, fine for some heat cycles and pootling but reading here, seems like the main might want to be bigger?

I'll probably try the Dave F mod at some point but don't have time to order the jets before a ride next weekend.

Cheers!

Greetings All, hope it's ok to enquire of the hive mind for a first post! Wondering if anyone has got a Banshee crank, or derivative, running in RD350 air-cooled cases? I've read quite a few posts claiming that it's possible, either as a drop in (if you're lucky,) or by machining the outside webs of the crank / fly cutting the inside of the cases. The webs, rod and labyrinth seals are different, but I think the cylinder spacing is the same for the RD350 / 350LC and Banshee. I'd really like to build an aircooled 65 x 58mm motor (short stroke RD400.)

Cheers!