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Thunderace power issue

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Hi All . I Have a thunderace sitting In my shed that I brought a number of tears back , the exhaust system had been replaced by the previous owner and the Exup valve removed . The issue is that it accelerates hard up to about 7000 rpm then will not rev past that  ..Any ideas where to start ? 


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  • 4 weeks later...

Hi there , sorry cleaned carbs ,flushed tank etc , new plugs as well still just stops revving at that point , I'm assuming that's the same Rev area the exup valve would start to do its thing so wondering if there is something sensor wise stopping it ? , it's not a flat spot you can get past it just dies there. Cheers 

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  • 7 months later...

Did you get this issue sorted?

The exup was for low rev power, it shouldn't cause this.

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