SmedSpeed XS650


smedspeed history

Howard at Smedspeed will cease trading on 28th February 2019. The business will pass to Rick Forte whose details will be on this site from 1st March 2019 onwards.

SmedSpeed was born in 1995, the first year of my Mechanical Engineering degree; I really needed something catchy/ridiculous for my first year carburettor project, it must have worked as they gave me a degree!
I have always tuned the motorcycles I have owned and ridden, at last count I have owned sixty six bikes, and amongst them five Yamaha XS650.  I started SmedSpeed around six years ago and have pretty much used the same home page since inception, so decided it was time for a change.

At the end of 2016 I decided to stop offering engine rebuilds as part of my core business, concentrating instead on supplying rephased cranks, cams, oil filter kits and much more. However I have relented a little and still build a few race engines for various clients, amongst them Kye Forte. This season Kye is out racing a beautiful rephased 750 flat tracker that his father built.

Kye Forte at Rye House track
Photo © Paul France

The bike is a proper flat tracker, with Champion copy frame made in T45 tubing (available soon through SmedSpeed), 750 cc rephased engine, with all the usual tricks. However it is not yet a dedicated race engine, it has more in common with the street engine components I supply than you would think, I have learnt a lot about XS650 engines in the last six or so years. I have tried nearly everything I can imagine; my web page reflects this attention to just one engine. I make all sorts of parts, as I firmly believe real bike shops should make what they sell.

I built over one hundred engines, and also rebuilt nearly a two hundred cranks, of which over one hundred and fifty have been rephased items.  I manufacture a sump filter conversion, clutch shock absorber spring rebuild kit, valve springs, and a whole lot of other Yamaha XS650 stuff. I have an assembly workshop at my home, and access to a full Engineering shop owned by a good friend with CNC lathes, CNC mills, welding and fabricating.

Give me a call or email me if you think I can assist you in your XS650 build. I am happy to answer technical enquiries, the easiest is to write me an email.

A pair of Yamaha XS650

These are experimental parts intended for racing and as such no warranty is given or implied. If you decide to buy it is on the understanding that you assume complete responsibility for any possible injury, loss or damage that may occur as a result of using these parts and that you accept these conditions of sale prior to purchase.