Idle Speed

[darrsi]

Its already had a litre of the IPA stuff you recommended go through it and the carbs have been off and cleaned twice and balanced twice Its also had a replacement air filter and oil filter and two changes of oil (after it dumped most of it over the roads...)

Pretty sure it has some more significant issues

Kentish - not looking to sell it I'm afraid Looking to fix it - this engine just needs to last long enough for me to finish rebuilding the other one, then they will be swapped over and I can start on a full rebuild of this one

IPA is more for getting water out of the tank, and lowering the freezing point of water in winter (carb icing).
The STP will clean carbon deposits off the internals, carbs, valves, etc.