After some final spannering, the 21SP rebuild is finished. Its nice to see the bike back in one piece.
Started well from cold, just took several kicks to get the fuel through.
A quick run down the road, wow its actually got some bottom end pull now. Granted the NSR is not known for much 'bottom end pull', but my bike doesn't completely bog under 5K RPM anymore and doesn't need huge amounts clutch slip to get going. In hindsight, it wasn't good. It should run a whole lot better throughout the range. Its being left completely OE, even the airbox, so hopefully it will do some decent miles before it requires any more attention. I'll save the usual trusted tuning efforts for my trackbike, what could possibly go wrong _________________ Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30
Last edited by RichG on Sat Feb 07, 2009 9:50 am; edited 1 time in total
Haha, mine were bad, but has nobody ever had a nut fall off of a bike? , at least they were the right way round.
A powervalve pully hanging loose doesnt bode too well for power, although once you connected it back and adjusted it for me the bike was flying! 66bhp with 2 year old RS pistons and rings cant be bad for a slow MC28
Fontyyy's made over 62 though with a stock motor and carbs on pump fuel
Anway, I forgot. You might not be the worst! Tom drove all the way from London to see me only to find his whole power valve arm had fallen off his! Hence the reason that wasn't do much. _________________ If I have to take the carbs off once more...
True, but fontyyy is much nearer the limits...hence his seizures.
I am interested in getting mine down to you sometime (with the new rings fitted - old ones had done several track days and most of a race season by previous owner, then 3 track days by me) to see what you can get out of it. I am pretty sure its good for nearly 70 with a couple of hours of your time. I am however not interested in squeezing the last few ponies out of it and making it close to seizure with the slightest temp change.
lol It's a '28. It doesn't need me to slow it down. I promise I won't make it any slower than it wants to be _________________ If I have to take the carbs off once more...
Very true mate, very true. A little problem can turn into a big one. Thanx for sharing the pix. Thats why she is currently parked till I get it all resolved. I dont wont to create any unnecessary damage to the motor over a $40 part.
I was reading this post because my MC21 is very difficult to start when cold. I cannot even bump start it and I will be doing a compression check this weekend (kickstart lever is very easy to kick over ) but I am wondering what symptoms I should be looking for to determine if it is piston/rings or if it's the crank seal like yours. Once it finally start it seems to run and idle fine although I do have to rev it much higher than before or else it will bog and stall from a stop.
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