After dropping my bike off last weekend and then waiting all week like a 5 year old counting the days down to Christmas, Friday finally arrived and phone call late Friday afternoon confirmed I was on for Saturday and a return trip over to Spa Motorcycles in Cheltenham to collect my old girl.
Having hopped on a Bus (yes I know what you’re thinking) such a rock and roll look way to travel complete with all my Motorcycle paraphernalia ! Spa Motorcycles didn’t disappoint – sat outside when I arrived was this, admittedly its a disembowelled “Yamaha” but even so it still looked impressive (maybe it had more to do with Marlboro colours it was sporting)
Not sure on this vintage power valve with a modern headlight and cowl – but hell I wasn’t there to buy, especial not a Yam ….merely to be re united with an old friend.
Sadly there are no pics of my bike on the dyno but I guess its all about the results and here’s whats she’s putting out, no idea how to interpret a good/bad or for that matter an indifferent dyno graph but 57bhp on a quarter litre made me smile – certainly more than I was expecting.
On a newly built motor with standard pipes and jetting I’m guessing this about where it should/expected to be?
Having had a quick squint on here, I can see tuned MC21’s and 28’s well inside 60bhp territory so mine is respectable! and a definite improvement on the restricted 46bhp it left the factory with, doing some basic maths it’s still 228bhp per litre in a bike weighing around 130kg/288lbs = not that I need it but it certainly validates having the motor rebuilt by Steve Alee at GT Performance Engineering in order to re live the 1990’s on and enables me to kill off a few brain cells sniffing the blue haze coming out of the exhausts in the process.
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Nick
Rebuild project NSR250 MC18 R4J