OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Hand and Power Tolls Power Tools Oleo HT27

Hi guys I am a newby, I have just got a used HT27 hedge trimmer. My problem is that when I bring revs up to about half way the engine dies, it's had mew gaskets and that, it will idle ok but as soon as revs come up it stalls, can anyone help me out plz.

Hi Gateway, and welcome to Outdoorking. The usual cause of the symptoms you describe is lean mixture at heavy throttle. The most common way for that to happen is that the fuel filter in the fuel tank (the weighted bit on the end of the fuel pickup hose) or the gauze mesh filter in the carburetor, is dirty. Other possible causes include a split in the fuel suction hose inside the tank, or dirt in the carburetor main jet and the associated fuel passages, or an incorrectly set metering lever in the carburetor. To verify that the problem is lean mixture, try gradually applying the choke as you increase the engine speed. You should be able to keep it running at high speed with just the right amount of choke. Of course it won't idle with choke on, so this is not a cure, it is just a way to establish with certainty that your problem is lean mixture.

Thanks Grumpy I will check that filter on end of fuel pipe in tank,never though of checking that, carb filter is clean once again thanks :)

Hi guys Back again. On closer inspection of trimmer I noticed that the gasket between Carb and heat shield was wet on one side,so I had a look at it and it had not been replaced with the others and I noted that the parts list shows two of these so does that mean it needs two at that joint. Thanks again

Gateway, your lean mixture symptoms are somewhat consistent with an intake air leak, though it should be lean at idle as well as at high speed, because the intake vacuum is highest when the throttle is nearly closed. Hence an engine with a leaking intake gasket is usually hard to start and will not idle. However it is possible that you have something else going on that compensates for the leakage, such as the choke is not opening properly when the engine is idling.

A continuously wet intake gasket obviously has something wrong with it, and the most likely thing wrong, is leakage. The intake pulsations are likely to cause fuel to be blown out, as well as air to be sucked in. While this might not be noticeable on a 4 stroke since the expelled petrol would evaporate on the suction part of the pressure pulses, on a mixed-fuel two stroke the oil will be left behind when the petrol evaporates, and the gasket will therefore be oily. That oil will also help to obstruct the leakage at idle and allow the engine to run.

Nearly all engines have an insulator between the carburetor and the intake pipe. The purpose of that is to keep the carburetor cool, mainly because cool intake air is denser than warm air, so a larger mass of air is able to enter the engine, giving higher power. Removing the carburetor insulator will reduce engine power, usually to a noticeable extent.

I suggest you look closely at the parts list and see of there is supposed to be a fairly thick plastic insulator between those two intake gaskets. It would be possible to use two gaskets together in the hope that it would work slightly as an insulator, but it would be backwoods engineering.

If your intake gasket gets wet while the engine is running, it is leaking and needs to be fixed.

Thanks for that I just replaced gasket between heat shield and carb but not had chance to try it due to it being late, thanks again seems like these trimmers are a lemon :banghead: