I have a hawkstone with a 250cc iron barrel, havn't ridden for a while but hope to get out this season, my problem is that ever since I replaced the piston the compression has been so that it is almost impossible to kickstart, I changed the cylinder head as an experiment and fitted a trials head with the facility for a decompression valve although this is plugged of , sure enough it made it much easier to kick over and it started 2nd kick, what I found then that it would 4 stroke when getting up in the higher rev range, it is fitted with an Amal 30mm concentric and I have always ran it on castrol R the main jet is 300'and the needle is on the richest setting, the reason for trying it on the rich side is I siezed the piston at ameys copse when I last raced it hence the new piston.
Can anyone give me any tips on any of these issues ?
Can anyone give me any tips on any of these issues ?
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