OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Victa Two Stroke Engines Victa Corsair runs hot

I changed the rings on this, can hear slight knocking sound at low speeds, also generates a lot of heat, can actually feel the heat emanating from engine while using it. It's a typical powertorque, if petrol/oil mix is right why do they run so hot?

spray wd40 at it , might help

That is an easy fix.
put it on your front lawn.
Glad to help

Check rpm, over revving will cause running hot. Check mixture, running lean will run hot. Check fins and fan function, needs air flow to cool the head and barrel.

Tempted but put a bit of time into this and reluctant to just throw it out.

Fins not clogged, will have another look at the fan. Not sure about the overrevving, by the way how are you checking the rpms, with a tachometer?

By mixture Dieselboy probably mean carburetor adjustment.

As for RPMs yes it is done with a tach and not how far it throws a rock at a Roo. Just make sure you tach is set for one pulse per rev and not dividing 2 or more as some tachs can be set to do.

Ok thanks, these carbys are not that adjustable, didn't think the revs were particularly high but the tach will confirm.

That slight knocking is most likely detonation. Make sure the jet is completely clean with a pin and carby cleaner. With it running, disconnect the hose going to the governor cap, does it rev up or not change? If no change, check starter and manifold orings leaks here wil cause high rpm and prevent governor from operating correctly.

Thanks Dan, mighty helpful, will give the carby a clean, no need to pull apart the entire thing, just the primer cap and clean the jet and the tube the jet feeds into?

It's a good idea to clean out the whole carb. If the air hose does not seal 100% you'll have dust and debris all through the cam.

Pete

a carboned up exhaust will also create heat.

Thanks Pete and Squizzy, will have to take things apart to confirm, attempt to do it in the next few days.