Rotax 582 consumption

[Olle1975]

Yes, their were getting hot and there is a dark ring during lean mixture, too?

By rotax manual you have to clean the pistons and rings every 100hrs, it isn't abnormal to get dark pistons and rings. Next reason is the oil type, I think, if you use mineral oil you will getting more carbon than synthetic oil?!

Do you have bikes only or do you fly a 582 too?

[Danzer1]

Olaf,

First, I am going to retract my suggestion for possibly moving the needle clip - that will not correct a lean idle condition (that would be midrange).

2nd, I did not say those plugs were running lean - yes they were running hot, not allowing the deposits to fluff off as they would if proper running techniques were used. They were being run "hard" - meaning quick acceleration and/or running at wot to long. And yes they are rich at idle too.

3rd, you can be lean in one range and rich in another. There a 4 basic carburetor control circuits each controlling a different range (with overlap). 5 if you count the choke circuit. They are:

Pilot or idle circuit - closed through about 1/4 - controls idle
Throttle valve or plate and its cutaway - 1/8 to 1/2 mostly 1/8 to 1/4 - low rpm operation
Needle jet, jet needle and clip - 1/4 thru 3/4 - mid range
Main jet - 3/4 thru wot - top end

Also effecting rich or lean is fuel quality, pressure and carb float position at all rpms.

So you can be rich in one area and lean in another.

On your final comment, Rotax recommends inspecting and ONLY cleaning carbon off IF the deposit is over .5mm - that does not mean you should expect or have carbon of any thickness. But IF you do - then clean it.

[Olle1975]

Danzer,

thanks for your technical statement!

What do you think about the oiltypes, do you prefer mineral or synthetic or full-synthetic 2 stroke oil?

Regards

Olaf

[Danzer1]

AMSOIL fully synthetic for all my engines. Dominator for 2 strokes.

[jiefuster]

I get 15l/hr at 56kts on my trike 582 blue head. That's totally aerodynamic
Ly 'dirty'. Castrol TT on my engine and it runs beautifully and pulls like a train

[Olle1975]

I think you mean Castroll TTS, which is know called Castrol RS 2T?