Italy. know a very good dyno technician!

 

thats good you might want to try putting an inlet camshaft on the exhaust side it doesnt take much just means having to do the valve clearances. i dont know what makes more difference my professional gas flow (polish&port) or the camshaft i also have not got round to advancing my ignition so my bike technically could have more mid range if i advance it by 2 degrees

 

Long shot but check your throttle butterflys and make sure you are not turning them past 100%

 

Thank alienjoe, i have already checked this and it's correct.
Anyway yesterday I pushed a little strong on the highway back home and after some ~ 20 miles riding fast and changing gears on the red zone at 100% gas open, the problem decreased little by little and finally disappeared!
So I think it was concerned with dirty carbs!!!

 

I'm trying to figure what's the advantage of replacing the exhaust camshaft with an inlet one...
I think I'm gonna ask my dyno man this winter when I'll do the dyno job!
Thanks for the advice

 

i dont know the physics behind it but many uk performance shops have told me to do it and the guru of steel frame engine tuning

 

Perfect! Did your bike gain or loose torque at low rpm?

 

Well this is my dyno graph



Bottom is well the same really but then again i have lightened the bike uped my gearing and had it setup as above were before all the tuning it was running rich.

It was running the same fuelling before engine tuning as the blue line on the graph and it was still rich with a gas flow

Red line is after the guy had finished with the fuelling

 

Thanks!