Hello all, after buying my NSR, MC21, iv change the tyres, 208gps, new pads, and new disc and final got to ride it today with a littl;e anger ANyway, i think the cush drive is on its way out if not gone already, ive never had a 2 stroke or a cush drive go on me so ill descride what im getting and someone is bound to know what im on about, as i change gear UP when getting the power on there is a definate snap as i get the power back on after the change then once the slack has gone all is well untill the next change, i get the same but less so on the down changes, IS this because they all do it, or is it likley the cush drive has had it? any way to tell? can someone also tell me where to get a cush drive, or what bike shares the same parts, cheers all

Have you checked the condition of your sprokets maybe they are very worn. It sounds like the chain could be slipping over one of the sprockets.
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Yeah done that, there in good nic, and i did the chain slack when i put the wheel on after tyre change, 20mm or there abouts movement also there is no free play what so ever when the bike is stantionary and in gear so its not the gear box, and again why i think its the cush drive.....mmmm i guess ill need to find one and try it to rule it out, .....

If you take the rear wheel off, and check the sprocket carrier for play you should have a better idea.

Take the sprocket carrier off the rear rim (just pull it off as there are five pins that slide into five rubber dampers that are in the rear wheel).

Check the rubber dampers for wear, and replace if needed.

Thanks,
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Charles Gallant

When I first got my MC28 I thought exactly the same thing. The NSR can snap on the power quite sharply as the chain takes up the slack. Make sure your chain is properly adjusted and get somebody who knows NSRs to ride it. It could just be normal.
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MC28 SE -sold-
MC21 with RS250 engine -for sale-
MC21 race bike -soon for sale-

MMMM, yeah i need to try someone else's or let them try mine, the chain is fine, and sprokets like wise, I was riding it today and it fely fine but i wasnt thrashing it, i was chatting with my friend who has just got his RG500 running and he said change the gear oil, just to be sure its nothing inside the box!!!! fair point as i dont know when it was done last.... i had a quick look for the drain plug today, but couldnt see it, is it an easy job? (well let me rephrase that) can i get to the drain plug without to much hassel? dont mind taking the fairing off, but i have a track day on Friday so dont wana start taking the bike apart and find out i need gaskets for exhaust etc etc , anybody, donr this, can you tell me what to look for (what the drain plug look like where is it) before friday would be good, i can alwys drain it over the next few nights, and fill her up at the track??? cheers

The transmission fluid drain plug is found on the right side of the engine (when sitting on the bike), underneath the clutch housing. You can't miss it, as its the only bolt down there. Kind of big.

thanks
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Charles Gallant

Nice n obvious, DOH! Many thanks ill give it a go...... LOL