yeh but when revved to 12500 rpm with 300cc extra 1/4 tonne force on crank
more so @ gudgeon pin forcing shit to happen ELONGATION OF PISTON @ GUDGEON
PIN LOCATION

FACT

BEEN THERE DONE IT TWICE IN 2000 MILES ON FRESH FULLY SERVICED 5000 GEN
MILES RGV

AND WHEN I WEIGHED MY WISECO FORGED PISTONS THEY WERE APPROX 20GMS HEAVIER
EACH THAN STANDARD RGV 250 PISTONS

FACT

WHATEVER GO GET 300CC CONVERSION AND THEN GET BACK TO ME WHEN IT GOES BANG
MATE




>From: "lanky_shagger" <lanky_shagger@...>
>Reply-To: apriliars250club@...
>To: apriliars250club@...
>Subject: [aprilia RS250 club] 300cc crank loads
>Date: Mon, 01 Mar 2004 11:46:46 -0000
>
>I see much twaddle about crank loads caused by a 300cc conversion.
>
>The 158cc forged Wiseco piston/pin weighs 105g, the standard cast
>124.4cc piston/pin weighs 110g. There is no more load placed on the
>crank because of the pistons. It's actually less. Fact.
>
>However, the conversion adds approx 20% more torque. It is this that
>adds more stress to the crank. If we assume that the safe working RPM
>for the standard motor is 12500rpm, then we can work out the new safe
>working rpm for the kitted motor. This works out to be 11400rpm (the
>calcs are too complex to show here).
>
>Since the peak torque of both standard and kitted motors is typically
>around 10500rpm, then you should be safe by not revving beyond
>11000rpm under heavy load (high speeds) for long periods.
>

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