Hello all, I'm new to the NSR250s. Bought my MC18 about a year ago, but sadly she needs a new crank. Anyways, there's been a little issue that's been bugging me.

I was browsing online, looking at pictures of MC18s and I noticed my bike's swing-arm looks different from the other R5Ks I've seen online. So I'm a little confused by the swing-arm that's currently on my motorcycle. The only history I know about the bike is that it has had it's rear wheel changed to a 17" wheel and aftermarket rearsets (Pop Malossi HRC stamped on them. Doubt they are authentic anyways).

So my questions is what swing-arm is on my R5K? is it a R4Js? or?




Thanks for your time

Welcome
Looks like r2j/r4j . R5k has groves in that match the frame and the rear brake is attached to a torque arm going to the frame.
Hope this helps.
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it wouldn't be fun if it was easy!

Indeed, the brake is the give away.
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Looks more like an R2J with some R5K bits on it to me!
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Vampire?

Woah, that's fast.

Thanks for the replies guys. Been trying to find out more about the history of my mc18. From the appearance alone, it looks like a R5K. with the R5K bodywork, 4 slot bellypan and high swept silencers. with the exception of the 17" rear rim and R2/4J swing-arm.

Makes me wonder, is mine an actual R5K or a R2/4J dressed up to look like a R5K. Are there any tell tale signs or stickers that'll help with identifying? Gave my mechanic a ring and even he isn't sure if it's a mk1 or mk2.

PGM2 unit under left side of the tail body will confirm that it's '89 R5K

R2 is PGM1

If it's an r5k there will be a hole in the frame ,on the right above the swing arm pivot ,where the torque arm bolts on.and the r5k rear foot pegs fold away earlier ones don't!
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it wouldn't be fun if it was easy!