I am currently modifying my boys XT660x for him as its his first bike and I have had many.

He is limited by his A2 license which is 47bhp (it does not stipulate any max torque figures) and 175kg is the minimum weight.again it does not stipulate if this is the dry or wet weight.

I believe the 660x comes in at 177kg, I am unsure if this is the wet or dry weight. Could anyone advise please?

I have ordered a second hand set of dekalvic twin pipes and kevs fuel controller and the o2 mod. Question- Has anyone ever done a dyno test with a set of open pipes and both of kevs little boxes of goodies but with no air box mods?

I don't plan on doing any mods to the air box as that is, I believe, is where the largest power gains are to be had and I can't get it to produce any more than the 47hp limit as that will invalidate his license and his insurance policy.

Any advice would be greatly appreciated