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the whole tcw-3 thing seems to have created a lot of confusion in oils, but the tcw rating refers to lubricity, (meaning how slick or the lubricating properties of the oil). a lot of oils may pass the 3 rating, but if your going to compare walmart to oem oil you'd find they both pass tcw3 fine...

the bore change from small to big was basically done to improve idiling charistics, also other modifications were done after the change mostly carburation i think there were 2 or 3 diff. carb configurations in one year in some of the preceding big bore models, but all that was mostly concerned...

Spare parts is pretty much right on about the alpha, it will hold up fine with your horsepower, and hes got a good point especially about the spray cooler and drive fill resivoir, most failures occur in the upper gearcase, due to poor/cheap oil breaking down under heat, and low oil level, dont...

Spare parts is pretty much right on about the alpha, it will hold up fine with your horsepower, and hes got a good point especially about the spray cooler and drive fill resivoir, most failures occur in the upper gearcase, due to poor/cheap oil breaking down under heat, and low oil level, dont...