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depends a lot on the oil (I find mineral smokes a lot more than some of the synths) and how you usually ride the bike. My little 250 that i ride mostly around town smokes quite a bit for the first couple of mins when it gets out onto the highways, needs a good thrashing to clear it out from time to time

Sounds like you're after more of an old-school pipe... the closest modern alternative I could find were Fukui. I got them made in stainless. You can retain the centre stand and stock footpegs with them - https://www.samurider.com/?p=29112

hope all of you chaps in the US stay safe - this thing is going to get much worse before it gets better

Hey Chuck! Actually I was wondering about that also. Do the new VM28s have removable air jets, and are there any issues with having two choke leavers?

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!

Be mindful of overfilling the trans oil and where your breather pipe is positioned - in my case, excess oil was spat out onto the swing arm, and then it ended up all over the rear disc brake and pads

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?

you'll find a lot of people on the UK forum using these actually, and they all seem to like them. Have a read of their latest piston debate thread if you wanna know more https://www.aircooledrdclub.com/smf/index.php?topic=59557.0 

Thanks Chuck, I have all the main jets etc so I'll try rejetting with the stock needle/needle jet first, but if I have no luck there I'll look at making the switch to the Dave F mod

Chuck, I always love seeing your work, so pristine! The 400E we got over here did indeed have the crossover from factory... So I'll try adding an intake crossover, y-boot with k&n and the 9mm reed spacers from EconomyCycle, and see how it runs afterwards. Hopefully it has the results I'm looking for

Ah yeah, the crossover tube - I see they added it on later 400 models - was it added in an effort to help the mid range, and what effect does it actually have? Cheers!

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

^ chuck some premix in the tank, fire her up then bleed the pump - the manuals indicate how much should be dispensed every X number of strokes at full stroke or something if you want to measure the output

 

Great, thanks guys, think I'll go ahead and order some