Sparked off by the previous thread (excuse me) ... what difference does the heat range make?
How should I choose the heat range plug to use?
I have randomly switched to 10 from 9 after my last rebuild for no particular reason other than somebody sai d they were runniing 10.5 with a similar setup.

Is it OK to do the plug chop with a 9 then run a 10 for actual use?

J
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MC28 SE -sold-
MC21 with RS250 engine -for sale-
MC21 race bike -soon for sale-