I have the stock Yamaha handguards fitted, with the small spoiler (which is remarkably effective considering it's size). There is no issue with vibration at all, probably because these guards keep the bar end weights. There are a good piece of engineering, designed for the bike, fit and work with the bike - but expensive.

I think the guards are something like �50-�60, and the spoiler another �50 (the spoiler is a complete rip off realy)

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Never underestimate the power of stupid people in large groups.