What are the gas settings for the mantis 2 cycle engine

In the Mantis 2-cycle tiller:
SV number is located between the gas tank & the carburetor, behind the gas line, on a black and silver tab on the silver engine housing. It will consist of the letters "SV," a number and another letter.

their is no compression release might have a problem with the valves

First check that your Mantis needs an oil/gas mixture, most of the newer Mantis tillers have four-stroke motors meaning they have oil in the crankcase and use straight gas. If your Mantis needs oil mixed in the gas use a 50:1 ratio. That's usually 2.6 ounces of two-cycle oil (it's sold in bottles that size) to one gallon of gas but read the oil bottle to get the proper mix ratio.

When the engine and carb were new, the factory settings were 1 1/4 turns out. As fuel deposits form and things wear, it is normal to need occasional adjustment. If the adjustments need to go more than 2 1/2 turns out, or if the adjustments seem to need constant change, then the carb needs to be overhauled. Here in the USA, many areas use gas that is 10% alcohol. The alcohol effects the soft parts in the carb and will often cause hardening of the diaphragm. If/when you overhaul the carb, also replace the fuel lines and tank grommet.
Good Luck!

IT is 200ml to 5 ltrs of unleded petrol

No it will be fine. You would be surprised how many 2 cycle tillers Ive worked on where people put strait gas in them. they dont run long enough with strait fuel in them to do any damage. I hope this was helpful.

I had this problem today. Loosen the flange bolt. Pull the engine off and check that the hex end of the shaft is lining up with the clutch pad in the engine-that it seats properly. Then make sure the shaft is seated all the way into the worm gear and put the engine back on. You will probably have to wiggle the shaft until it seats into the clutch. Tighten the flange bolt when the engine is seated flush with the worm housing (with no gap). That's all I did and the power is back up. Hopefully you still have your manual with the parts blow-up. (page 29?) BTW, have you checked that the wormgear is greased?

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What kind of engine is it ? Does it have a float carburetor or diapram carburetor ?

if it leaks gas,it can **** air.you have to find out whats leaking and stop it.