Raine wrote:
Both bikes also repeatedly suffered from fried PGMs / inoperative power valves. This was a common problem when I was last active in the NSR community 20-odd years ago, but there didn't seem to be a consensus on fix. I remember something about voltage regulators causing power spikes to the PGM?? I presume there is now a well-known fix? Can someone point me towards a link with fix / explanation please? I want to put that fix on both bikes. They both used to seize a lot too, which is somewhat annoying on what were basically stockish bikes.
Wow! There's a name I've not seen for a long time!
PGM-III failure was almost always nailed down to poor RC Valve maintenance and adjustment. Since pressing this at every available opportunity over the years, blown PGM's (on the RC Valve side of things) have become virtually non-existent, except for the odd noob that's not heard of the past problems.
As for seizing, it certainly shouldn't be a common problem if set up correctly. The problem is there were (still aren't) any stock settings for a delimited NSR, and "somewhat stockish" is rather telling. Pretty much every bike we set up over the years, that wasn't bone stock, varied slightly. Also, as soon as one does seize, and gets a replated barrel, invariably the plater skims the top off the barrel to clean it up, and that can spell disaster for some motors that are already on the limit.
You won't find a more qualified company for NSR250 work in the UK than Performance Engineering in Plymouth. There are some spectacularly good RS250R techs in the UK, but for NSRs specifically, you won't do better than GTPE. They often have a van heading in your direction, so could possibly even collect the bike(s) depending on timing & convenience, so worth giving them a call and asking.
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Andy.
NSR-WORLD.COM
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