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Mitox 281 MT - Fuel starvation and motor stopping

Fuel starvation. Moor dies when throttle used. Have to run on full choke to keep motor running.

Posted by Anonymous on

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Same problem .. Very temperamental . Have been told that petrol now has more alcohol in it which swells diaphragms and causes issues .carb can be adjusted but needs special tools one for idle and slope and one for main jet needle in Venturi.. New carb on mine and still difficult.. Low compression will cause low idle problems and starting problems too ... Good luck.

Posted on Nov 11, 2015

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Posted on Jan 02, 2017

stug_57u
  • 99 Answers

SOURCE: chainsaw won't keep running except on full throttle?

Running at full throttle but not at idle would probably be caused by not enough air getting through to the cylinder with the fuel. This could be caused by blocked/dirty air filter, air leak or worn/damaged piston or cylinder. The higher the revs are the less air to fuel ratio is needed so it will run at these speeds. First check your air filter, if that is fine take the spark plug out and examine the inside of the cylinder. You will need to check here with the piston down. If you want to be a bit more thorough you can remove the exhaust and check the piston face and inside the cylinder from here aswell. You don't want to see any scoring or solid lumps of anything in here. While you have the exhaust off give it a few firm taps to make sure there is no major carbon build up and clean the spark arrestor if it has one. The arrestor is normally a small gause found on or near the exaust outlet pipe. If that all seems fine then get some soapy water and squirt it around the carb gaskets and pipe that runs from the carb to the cylinder. If you see bubbles appearing here when the machine is running then you have air escaping and it will need investigating. Failing this you could have worn piston rings or crank seals. Ideally to test this area you need proper pressure testing equipment.

Posted on Oct 27, 2008

  • 1 Answer

SOURCE: spear and jackson chainsaw. runs

OK - let's work through this. If you need choke all the time then the mixture is too weak when the choke is off. Putting the choke on literally chokes off the air supply to the engine by lowering a small shutter across the entrance to the carburettor. That means either there is too much air getting to the engine (don't see how!!) or too little fuel. So, how do we get too little fuel? You could check for this as follows;
- before we do anything tricky let's check the obvious things - is there a fresh fuel mix in the tank? Petrol does go off, especially if there is 2 -stroke oil added to it. If it's over a month old from the pump mix up a fresh batch. Is the idle speed set too low so the engine stalls when the choke is knocked off? You can see this screw to one side of the carburettor (you need to remove the top lid in front of the handle on the chain saw, and then remove the air filter to see it). Turn the screw half a turn clockwise to speed the engine up. Be warned - if the engine starts it will run faster than normal and that means the chain may start to spin around. Also - check that the chain brake is off (i.e. the safety lever is pulled backwards, and that the chain is free to move BEFORE you attempt to start)
- is the fuel filter blocked? To get to this, make a wire hook (e.g. thick fuse wire) and gently hook out the fuel filter that's sitting at the bottom of the fuel tank, and take a look at it (be gentle - you can damage the gauze if you are clumsy). Does the gauze look clear? I.e. if you dip it into petrol it will freely run into the filter and of course drain out when you lift it? If not, replace it.
- next stop - are the jets in the carburettor set right? I don't have a service manual for this (and I know the manual says unhelpfully "return for service") but basically you will have seen two holes on the side of the chain saw (below the handle) two small 0.8cm holes; one marked 'L' (for low speed) and the other 'H' (for high). Put a fine flat screwdriver down the L hole and feel for the slot of the low speed jet. Once engaged turn it out half a turn and this will enrich the mixture - if this seems to help and you can start the engine then adjust the L jet in or out until the engine is idling comfortably. If it idles too quickly then you can also turn down the idle screw (see previous paragraph).
- no luck still? Well, it could be fuel pump or a blocked jet in the carburettor but this really is a 'return to the service centre' task!

Good luck!

Posted on Jan 12, 2009

cj2176
  • 520 Answers

SOURCE: the saw wont stay running. I start it with full

Sounds like the carb needs to be rebuilt. Those tiny jets will clog easily and need to be replaced. The diaphragm is also a large part of bogging and dieing. Hope this helps.

Posted on Jun 14, 2009

nobby63
  • 10 Answers

SOURCE: chainsaw wont stay running

check crankshaft seals,maybe sucking air. most of the time the seal on the starter side. hope this helps.

Posted on Jul 09, 2009

Jim1969pa3
  • 152 Answers

SOURCE: Not running at full throttle

close to the carb you will find two tiny screws. They are labeled H and L. L sets the idle speed. H sets the max RPM. Hold the throttle wide open and turn the H screw. When you find the very top end, back it down some or it will be running too lean. That would make it run hot, and provides less lubrication. Could result in engine failure if you run it too lean.

Posted on Dec 23, 2009

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