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Hi there,

I have just fitted a complete Keihan (Conti replica) exhaust system and the change in performance has been fantastic - probably a 15% to 20% increase in power at all rpm. The bike felt a bit flat - and even undergeared - with the original silencers. The only problem is that the decibel ...

Hi Craig

Thanks for the reply. I see that a lot of the SD Darmahs have been modified with 40 mm carbs. Can you give me some idea of what work is involved? Also, can the conti silencers be fitted on their own without any other changes - ie to carburation?

I probably wouldn't be making any other ...

I bought a 1978 900 SD Darmah from Motori di Marino in West Sussex last May and am interested in suggestions for increasing the power. It has done only 8,000 miles and is in completely original condition. I use it for town and country trips and would like to do the occasional track day.

I only ...