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Hi guys, maybe a daft question, but are the RD carbs all mostly the same, with the exception of the air jet size? I've found some 250d carbs and I'm wondering if they would suitable for doing the Dave F mod/primary needle jet conversion for a 400c. Cheers!

I'm about to try replacing the steering head bearings on my RD250 - both in the frame and on the steering head. Wondering if you guys have any tips or tools you can recommend to make the job easier?

Hi guys, great to see the forum back! Now that it's summer down under I've been riding the 400c some more. When I last left it, I was trying to jet out the 'bucking' that happens at ~5k with the throttle closed. I've got that down to a minimum, but there's still a flat spot at ~5k before it rips into the powerband.

It's a bit annoying on the highways - either I have to slog it along at 4k or keep it on the pipe at 6k. Bike has Fukui chambers, Vape ignition, pilot jet might be a bit rich at 37.5, and main is currently at 180. Needle 2nd clip, air screw 1 1/4 turn out.

Been wondering whether it's worth moving a Y-boot with a K&N, and also running reed spacers to try and bring back some of the mid-range. Obviously going back to stock pipes would probably be best for torque, but the pair I have are a bit trashed (hence the chambers). Any pointers? My 250E by comparison is really smooth through the whole range, not flat spots or anything. Cheers

My fork stanchions are in kinda bad shape so I've been looking around at some aftermarket options.

Has anyone tried these or can comment on whether the aftermarket options (e.g Tarozzi, Yambits ones) are a direct fit?

https://www.ebay.com/itm/Yamaha-RD400-34mm-Fork-Tubes-Stanchions-NCS-Hard-Chrome-Stock-Length-/171661372575

Cheers