Re the GRM case volume - as I have said a dozen times I have never been able to get better power going under 1.3 case ratio with a reed engine.
Any bigger and you have to run the reeds so soft,they loose control at higher rpm and power drops - the exact opposite of what a big case should be capable of.
In a KZ10B TM kart engine I cut 5mm of the reed face on the case.
This needed stiffer reed backups to get the power back, but that lost too much mid power capability.
Adding a 10mm spacer ( making the reed 5mm further out than stock ) needed the reeds so soft that the small amount of mid gained
from them was completely lost by a huge drop in overev power.
Re the KTM exhaust duct - yes they are stupid huge and adding ears to try and promote the Aux blowdown flow is very overwhelmed by the fact that
you have just made a huge power loosing duct, an even bigger liability.
Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.
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