Gasket and spark plug rule updates in UK OK and OKJ
The MSA has updated the regulations for the UK versions of OK and OK-Junior, specifying that only one gasket can be used in the carburettor and the exhaust, and giving a list of approved spark plugs.
In both classes, the carburettor must have only one gasket of a maximum thickness of 1mm, and the exhaust must have only one gasket with a maximum thickness of 2mm. No other spacers or thermal blocks allowed.
Both classes are now only allowed to use the NGK B10EG, B10EGV and B105EGV plugs.
The updated regulations are here.