Namely this one, it's not that tidy anymore!

Not sure this will be much of a "build" thread as it seems pretty good already, it needs virtually nothing. Who says don't buy ex-race bikes, they're the best cared for bikes out there!

I'd realised yesterday morning (much to my alarm) that I'd booked a Brands Hatch track eve with the California Superbike School and forgotten about it
The plan originally was that by now I'd have done a fair amount of racing, be well upto (my) speed and to try and get back into the School way of riding as I just don't pu it into practice once he flag drops.
But as I've actually done 6 laps and then broken my collarbone clearly this was the time to shake the new bike down.

It jumped into life with ease (not run since October apparently) and sounded pretty much spot on running 95ron unleaded.

Spec is (I've been told)
Mild Apex Leisure modded motor (wet clutch)
HRC jet kit (true, I've got the rest of it too)
Tyga pipes
Open airbox (i.e. no lid)
R model forks revalved and resprung by Reactive Suspension (£350 receipt)
Supposedly CBR600 rear shock, monkey thinks not, whatever, it's not stock NSR as it's pretty firm.

So, first impressions, apart from a soggy front brake (fluid?) and no rear brake at all (HRC leaky hose?) it's fine, pulls really well, carburates near perfectly, handles better than I can exploit and as a bike to fit me, it's better than the '18, that Tyga RS-alike fairing is big!

That's it so far, I'll get it daylight MOT'd, may fit the rear light and some front light hidden in the nose vent and I need to get something done sometime about the noise as 've got a couple of quiet TD's booked at Donny this summer.
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Glad you're enjoying it Fontyyy!! It always ran really well for me, and I'm sure it will for you too.

It was measured at 103db at my last outing at Cadwell, if that helps.

As for the shock, I was told it was CBR6 and it says CBR600FX/FY on it, and as I have no idea what a CBR6 shock looks like, that's what I took it as!

Keep us updated on how you get on with it, and good luck with the rest of the season mate.
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Measured 99db at Brands. But Donington is a bitch, noise meters at various places round the track.
Stock pipes, Tyga cans, modded airbox lid is too loud, it has to be stock pipes, stock airbox.
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I'll have my stock pipes free for you to borrow by then mate.

As for the shock I've not actually seen it yet, I believe the NC29 standard shock is slightly longer than the NSR one and the CBR shock is longer still and the way your bike is stood on its nose.....
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold

Right, this is in no way a dig at Rob who I believe left the setup to someone else and has never even had the carbs off, but;

In the fitting of the HRC airtray (should make little difference to setup really as it was running a lidless airbox before) I discovered the RC valves have been lined up perfectly to the marks with the TPS plugged in and cables so loose you can wiggle the butterfly a good 5mm! Which is lucky really as lining the RC valves up that badly would mean at fully open they'd be jammed against the cylinder roof.
This probably goes some way to explaining the quite pronounced jump in power delivery as the RC valves are never fully closed and are opening too far at lower revs.

With this corrected and the airtray fitted the bike now ran like a pile of rubbish, took loads of coaxing at minimal throttle opening to get onto the pipe and feels pretty rich (oiling the pipes slighty, plugs as black as the ace of spades). Which is what you'd expect closing the RC valves more.

Also whilst fitting the airtray I noticed, no red X piece (the bike supposedly has the HRC jet kit fitted and I have a bag with a load of jets and a couple of HRC needles in). Never mind, I've got a spare.

Whilst seeing whats really in the jet bag (just glanced when I picked the bike up) I find I've only got the B needles, a hand full of jets and the 38 slows. Now that's odd, the bike is fairly stock, running normal pump fuel and really should have them (the B needles) in.

So, carbs open.....stock (NSR) needles...sigh. But at least these are '21 carbs and I can get to them.

B needles in, quick test, better, lots better, pulls harder at the top, revs from low down cleanly...nice...maybe too nice, perhaps I'll sneak it up a size or 3
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I certainly didn't take it as a dig mate, I'm glad you're getting it sorted John. Unfortunately, I never have been or never will be a 2 stroke expert, and in the 4 times I had the bike out it ran very well as it was, so I never felt the need to mess with it. I was trying to learn as I went along without wanting to damage the bike!

I did get advice off a friend of my old mans who basically said the same thing: it runs well, it's not running lean, so just get out and learn to ride it. Then worry about getting it nearer to the edge with set up when your lap times come down. And as he was a two stroke racer of some repute in the 70's and 80's who was I to argue!
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The jetting for the engine setup as it was was fine, but whoever adjusted the RC valves wants a good slap, preferably with an NSR manual containing details of how to set them up properly.
I know what you're saying about learning to ride it but anyone will lap faster with a few more horses pulling them along.

Never mind, it's not the first NSR to have the RC valves lined up on the marks with the TPS plugged in and it certainly won't be the last.

Without reading the manual it's an obvious guess, though the amount of adjustment you need and how close it takes you to minimum adjustment on one side and maximum adjustment on the other should give the game away that all cannot be right.
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Righto! I rode this bike at the Anglesey meet this weekend as my plan due to the unpredicatable weather was to have a wet and a dry bike, unfortunately Sunday (day 2) was so wet and windy the races were abandoned.

The selection of the '21 as the dry bike was purely as it has some Diablo Supercorsa's on (in now apparently unobtainable 110 and 150 sizes) that deserve more than just being squared off on the road.

Inital observation is the '21 (even with stock R forks as the resprung/revalved ones it came with have a leak) will tie the '18 in knots if the place is twisty enough. The '18 feels somewhat quicker, maybe just as it's lighter and has fresh rings but the '21 just turns so well.
I've never felt so confident with the bike over on its side in my life, even on my '28 c/w £500+ worth of K-Tech suspension set up for me.

Maybe it's the tyres...maybe not....
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It may well be the tyres, i had the 110/150 supers on my 21 and i thought they were by far the best tyre i've ever used, they were perfect.