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That’s some karma for ya....
The Shop
There's tons of stuff you can do to a pdub. Cutting a slot in the intake side of the piston, milling the head and cylinder base. The exhaust pipe flange has a big weld inside that you can grind out. You can unplug a wire and the bike will rev more. This are just a few things I've heard over the years.
And just for the record my kid never raced or rode a pdub so I have never done any of this.
Like the old saying, "you must be cheating, you beat me and I'm cheating"
example: PW's are oil injected. they have about a 1/2 gallon tank of 2stroke oil behind the front number plate. the throttle cable splits into two wires, one of them operates a valve/pump on the crankcase that pulls oil from that oil tank, and injects it into the carb.
it's illegal to remove that pump, it's illegal to run premix in that tank, it has to be oil.
there are several shops that amongst their 'LL pw packages' , will mod that oil pump so that it will open and close on throttle operation, but the mod causes such little oil to come out of it , nothing is effected. they then run premix in the gas tank. so basically the oil tank is full of oil, but it's not going anywhere.
oh, and as crazy as that sounds, thats a 'technically legal' mod, as the systems are still in place.
it gets even more shady after that...
Pit Row
The correct term is undocumented upgrades.
Like my mate said who uses an engine builder in a stock class
And some dads don't want to buy a new bike with every small advance in skill, especially since the PW comes so intentionally downtuned. Most mods are just reversing the mods Yamaha added to the QT platform when they made the PW (removing the big blob of weld they put in the exhaust, and unplugging the ignition limiter).
(ama rulebook Section 4.5 Rule 4a)
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