SC46 engine won't rev higher than 8000rpm
by Robert
(Fife, Scotland)
I have had a SC46 engine for a few years. It has always run fine and revved up with plenty of power.
Recently it has gone a bit sick and won't rev. A friend put a counter on it and we see it is only revving to 8000rpm.
No amount of carb adjusting could get it to rev higher. I tried changing the fuel from straight 20% castor to one with 5% nitro. Doesn't make any difference.
One of the club guys mentioned "varnish" build up inside the engine. So I tried stripping the engine and cleaning the piston and liner. Stripped the carb and cleaned everything.
Any advice on what can cause my engine not to rev. I am a bit reluctant to buy a new piston and liner at 50% of a new engine cost if it is something else.
