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Will an after market spark box make any noticable difference on a stock 03 XR100?

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Will an after market spark box like the bbr etc. make any noticable difference on a stock 03 XR100 or will it just raise the rev limiter(which is useless on a bike with no top end,like my xr:))?

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No. All they do is retard timing at startup to make starting easier with a high compression engine.Any power gains would come from more advance, which you dont get with these; have verified this with a timing light. I have the BBR box on my 88 ZB50 (now 110cc) 'nutcase

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