First of all hello was on here years ago as liffy16 but I could not retrieve my account as my email had changed.
Anyway rebuilt my mc18 this winter had crank rebuilt by Steve at Gt, top end was ok just new rings.when first rebuilt after running in bike was flying and would rev clean up to redline.
Now though it won't rev past 10k checked float heights and there at 13mm even removed pump as I think keep valve is leaking,so now on premix at 30=1 anything else I can try regards colin

Ok update went to bike meet last night after about a 20 mile run bike started running better, pulling like it used to ,could it be some sort of electrical gremlins?

Could be old fuel or low battery charge. It's unlikely to be connections unless you have disturbed them.
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Why do things simply when you can complicate them

Thanks for the reply does the battery need full charge to operate power valve?don't think it's fuel done a few tanks of fresh v power recently

If you use the search with power valve battery, you will get several topics similar to your question

Also, the power valve switches to a config setting at 2000 rpm, so you can check it is set correctly. It's worth reading through the tuning section for power valve setup https://nsr-world.com/tuning/250-tuning/engine/
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Why do things simply when you can complicate them

HI Rob H or Andy. Went to the link about tuning/powervalve and the last section re: power valve mentions a diagram but i did not see the diagram. Can someone provide a link? thanks.

tleighbell wrote:HI Rob H or Andy. Went to the link about tuning/powervalve and the last section re: power valve mentions a diagram but i did not see the diagram. Can someone provide a link? thanks.

Should see this:


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Andy.
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Thanks Andy

Update on nsr checked battery and as it's not very old it was good and stator is charging ,so tweeted float heights about 0.5 mm and it's going like a nsr should again,thought clutch had started slipping at about 9 k but no this is how it should go like😁👍chuffed or what

Great news, and thank you for posting your fix.
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Andy.
NSR-WORLD.COM

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Andy wrote:Great news, and thank you for posting your fix.

No problem Andy, I knew this bikes were sensitive to float heights but that's something else, hardly moved them,just in the tolerance 13.5mm from 13mm

Maybe you just blew the dead spiders out of the carbs.