I've always ran the 1.4s with no problems. The GG 300s are not prone to boilover like the KTMs, so start with the stock cap. Mine only spit a little in a bad mud race at a slow pace, and then not much at all.
The GG water pump seal is nothing like on most other bikes. Its a high speed graphite/ceramic industrial pump seal. The design is such that the higher the pressure the tighter the moving sealing surfaces are forced together.
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