Sorting out the Sport Scout heads

Just been in to see John at Moray Firth Precision Engineering in Inverness, he's just finished skimming and matching the 640 heads for the Sport Scout. When I stripped the top end off the motor at the tail end of last summer, I found that the heads were running at different compression ratios, and that the rear head was badly in need of a skim.
My pistons pop up above the cylinder beck by 0.087" .. John has matched the pop up in the head to 0.118" to allow some clearance, if more is needed I can sort that out between the base and cylinder head gaskets.

Big Base

The ‘Big Base’ Indian 648s were the ultimate development of flathead engine technology, with high-dome pistons carrying two compression rings and one oil ring. The name came from the huge oil capacities, because the bikes were fitted with extra-large sumps designed to help engines cope with the stresses of racing.

Its thought that only seven factory Daytona Sport Scout 648's are stll in existence, so the chances of ever owning one are highly unlikely.

With a lot of Indian tuners still chasing ultimate performance for their vintage racing Scouts, it is possible to build a replica motor, up until now the sticking point has been availability of cylinders... looks like that may not be an issue any more!

available from ... www.enfieldracing.com

Flatslide Del

Kindly donated to the Injun cause by Richi at Fossfab this 39mm VHSB Dellorto from an Armstrong Rotax motor to try out on the Sport Scout using an adapter I got from Rocky at Ironwigwam








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Trials Scout!