Sorry for late reply mate, you guys use different clocks
I have the Savage X and it says the engine is HPI Nitro Star F4.1, not sure if it's .25 or .28[

] Atm, the truck is running like a dream, if I need to replace the CB and SG I'll stick to your recommendation of 18/49
Apologies to Stu, didn't mean to hijack your thread mate[8D]