It's great to find this forum! Ive spent the last few hours enjoying reading my way through the posts.
I have a NSR250R MC18 '88 (PGM 1), which Ive had since I was 18 and Im looking to restore/ get running again.
Excluding the motor, the bike is fairly sound with needing only cosmetic touchups. Its never been dropped. My questions relate more to the engine and the PGM unit.
I seized the original motor over 25 years ago and swapped it straight out for a Dry Clutch SP engine which I bolted straight in. The engine never performed all that well, and the mechanics I had look at it had issues getting the RC valves working correctly/at all. I NOW realise that the PGM 1 unit may not correctly drive the RC valves of the newer motor.
Fast forward ahead a few years in my youth, and I've seized the top end of the the SP engine. I have then purchased another 2nd hand low km motor which is the correct motor for the bike. And that is where I am at.
I have two chains of thought here. Feel free to offer advice or flame me, all will be taken in good humour
1. Option 1, Top end and bottom end rebuild the SP motor, maybe utilising a Big Bore kit from Tyga, and have alot of fun. The only caveat is I need to get the RC valves working correctly, with the PGM I. Is this possible? Do I need to purchase a PGM II? How good are the Tyga big bore kits? Are the motors still relatively reliable given the substantial hp increase>?
2. Rebuild the stock motor and install and bring the bike back to as close as original as possible? This is my end goal, as the bike is starting to be a bit of classic.
3. Option 3. Rebuild both, have the SP for fun and the stock motor for classic restoration of the bike when I'm to old to ride.
Sorry, if I seem to be waffling, just trying to get a grip on what to do here. As I said any feedback appreciated.
Regards,
Kris