Hi Kev.

Just remember that this Xt is a stock bore and stroker, so all the runs I have posted are from a 660cc motor with and without the cam. Also, I don't like the slip-on exhaust systems this bike was running. From testing on other bikes, I don't have much faith in them to be really good for performance. I am not sure what this bike would have done with a set of well made slip-ons, but anyway, I tested the bike with what was given to me.

I did not port this head and from what I have seen about other porting by the same person, it looks more like a cleanup job than a proper full on gasflow job. Also, this head uses stock valves and I don't even think they cut the seats again after the porting.

A bit of cleaning here and there is hardly going to make much of a difference.

I can still put the run on here that you requested, but there is no point in comparing a 686cc vs a 660. The 686cc will easily make more power.

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Disclaimer: any mod undertaken, are carried out at owners risk