The problem is we've found every setup responds differently, hence why I don't let people discuss specific settings. I do remember numerous occasions where "no lid" performed significantly worse than with a lid though, which kind of contradicts how well (a) my MC21/NSR-WORLD tune works with Ramair pod filters, (b) the F3, and (c) HRC SP runs so well with just the minimal thin plastic carb shield fitted! Our NSR-WORLD tune does include crankcase work though, but the SP tunes don't, and they work well with just the shield and open carbs!

I'm not entirely convinced by those BR9ECMIX plugs. I hold my hand up, and say I don't know about the properties of iridium plugs, but I've often wondered if they are suitable for an ECU effectively designed 40 years ago, and if they "need" more juice than an ageing PGM can supply?! I remember Matt@TYGA telling me how, even though part of the MC28 race kit, they often even struggled with poor signal when using the R5300A plugs with the PGM-IV. We've never however, had any problems with the BR9ECMs.

My little snippet would be "stock NSRs tend to run inherently rich". As standard, they need to work "out-of-the-crate" in all kinds of climates and (within reason) altitudes, on not always the best fuel! Opening the airbox up, and delimiting the ignition affects jetting much less than you may suspect. Almost as if they're pre-prepared for delimiting! You may be looking at closer to stock settings than you think. It's also well worth asking TYGA (if you haven't already) if they recommend main jet sizes with their system. (When I bought my Ethos chambers and KISS delimiter from Japan, Ethos also supplied a pair of main jets -- I can't say what size, as it's irrelevant to your situation. Maybe TYGA have a preferred size too though?)

Not sure if any of that waffle helps, or just confuses things even more? Basically, I'd recommend getting things closer to stock, rather than trying to make a slight mis-match work, and then restart modifications.

At least you know the PGM and RC Valve is good now.
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Andy.
NSR-WORLD.COM

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