I bought an NSR250 mc16 recently. The engine was seized when I bought it, but I picked up the bike for next so nothing so it was still a good deal. I've since stripped the whole engine down and found the crank bearing to be rusted. I'm planning a full engine and bike rebuild, but I've run into one or two confusing issues.
I managed to find a replacement mc16 crank, but when it tried it in my cases it wouldn't fit. A side by side comparison with the old crank showed it was considerably different. I now believe that this bike was fitted with an mc18 engine, but It could be a 21 bottom end. I've been searching this site high and low trying to figure out what engine I have. There's lots of information, but nothing that says these engine numbers = this model, or something like that.
The engine number is MC16E-1130166, the barrels and heads look to be mc18's (hexagonal with large exhaust ports).
Here's a photo of the exhaust port if someone would like to confirm this.
http://i1253.photobucket.com/albums/hh587/wil_nz/DSCN1176.jpg
I would really appreciate it if one of you knowledgeable nsr folks could help me id this engine. As so many nsr engine parts seem to not be interchangeable, I'd like to know exactly which parts I need to find to rebuild this engine.
Hi
Engine numbers mc16e1130033 to 1149562 are 5k either mk1 or mk2
Is it rubber mounted or hard /fixed mountings??.
Hope this helps, _________________ NSR250 MC18
Hi , you can rebuild the crank for your mc16 motor if the pins are fine and if the centre seal is ok . It has 24mm pins while the other mc18crank has a 25mm one .
This is a long shot...but was reading your old post and was wondering if you still have the MC16 crank....? have a very early serial numbers matching 86 nsr 250 r that is all original, but I blew the main center crank bearing and seal.....so if ya read this and still have it ..in usable condition ?...I would appreciate an email...bstebbe@hotmail.com...Vancouver British Columbia Canada. please let me know thanx.
Brian Peter Stebbe
Hi there
I was reading you post for the crank I might have a mc 18 crank from my old NSR I thing the seal and the bearing are OK I will look for it and get back to you
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