I,m fitting liners to a 750 block to get it back to std bore (it had damaged skirts) and as a matter of interest i weighed the new Hepolite branded std size pistons (made by JCC in Taiwan) and compared it to the +.060 thou JP pistons that were fitted.
The JCC std pistons weighed in at 315g
The JP .060 pistons came in at 390g
Taking into account the .060" greater diameter will increase the weight somewhat but a 75g difference is huge.
Does anyone have a plus .060" 750 JCC piston or a std size 750 JP piston they could weigh for me.
I also have an original AE hepolite std 850 piston that weighs 391g and a GPM plus .020" 850 piston that is 406g
All these piston weights are with rings,clips and pin.
As you can see the 750 +60 JP piston is almost the same weight as an original AE 850 piston
Gives you food for thought as the lighter the piston the less stress on the crank and rods
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