Honda Air Tools & Compressors - Recent Questions, Troubleshooting & Support

I would start by getting a can of carburetor cleaner and have it 'at the ready' and try the 'start, run stall, start run stall' operation again. Only THIS time, once the engine begins to stall, give it a couple of quick shots of the cleaner into the air filter to see if it stays running on the cleaner. If it does, then it's still a fuel problem. If it doesn't, then it probably an ignition problem. I would be sort of leaning towards the ignition coil getting weak. The reason I'm saying that is your statement about it running (I'm assuming cold start) for at first, 10 minutes then it stalls. Start it again and it runs for a couple of minutes and stalls again. This could possibly be from the coil getting warm/hot and not producing the needed spark. After a 10 minute run it simply gets too hot and stalls the engine. After the next restart, the coil is already warm from the engine and so it don't take as long for the coil to get hot and stall the engine again. Hope this makes sense and helps you out.

Your compressor is made by Hitachi. The pilot valve is what controls the engine and the pressure. Most likely the pilot is set to idle engine at 125 psi. The pilot valve can be adjusted higher or lower depending on needs but not higher than say 140. As the pressure drops to about 80 psi the pilot will cut in the engine to refill the tank. Pilot and throttle controls are finicky and require constant tinkering and or parts replacement. Your compressor needs the pilot to control pressure however does not need the throttle control. You can set the engine on constant speed. Less trouble but uses little more gas. Just remove the throttle control from the pilot and plug the hole. If the bad part is the pilot itself you will need to replace it. The new pilot will be adjusted to about 125 psi. Good luck with your repair

they are marked on the gears arrow goes to dot

make sure the unit has oil if low it will not start and make sure the switch is set to on also check the gas valve is open

I'd re-clean the carb.

Regular 10/30 oil. Take a look on amazon, here: Amazon com honda 10 30 oil for engine I hope I have helped. Cheers

your carb is blocked and you will have to clean it and also check the filters for blockages

take it in to honda dealer for a warranty check

You have dirt in the carb, remove it and rebuild it and blow out all the passages with compressed air.

should be an internal govenor on a plant unit like that ... there is a thicker than normal metal rod running off the carby to the motor and that is where you adjust the govenor cant find good instruction how that governor is adjusted ..if adjusted the wrong way it will rev out may even throw a piston then check carby idle adjustment should hunt (rev up and down only slightly )as load changes you tube 11hp Honda GX340 cold starthttps://www.youtube.com/watch?v=i3_v68__X5o Honda GX340 HGI Parts

the chart shows figures of 10.7 hp-8.0kw with a torque of 19.5 ft/lbs- 26.4nm at 2500rpms ( max net torque) the chart shows gx390 is 11.7hp (8.7kw) but the torque is the same as the gx340 you can get these figures from world. honda com or by going google and typing in--torque range of honda gx 340 motor at max rpms 10 hp engines running at 2500 rpms will be good for gensets of 5kw continuous out put as most makes run that size engine

The float needle in the Carburetor is not holding a good seal. Gas tank is higher then the carb so it keeps filling the bowl till it runs into the cylinder and around the piston rings down to the oil.Might remove the bowl and pull the pin and drop the float and needle . check the rubber tip to see if it is still some what softer then you finger nail. Take some fine steel wool balled up on the end of a small jeweler ***** driver and shove it up inside the hole the needle came out of and spin it with the thought of polishing the brass face that the needle meets to. If the needle tip is to hard it might not seal up good. you might want to put a shut off valve in the fuel line before the carb, this is what I did and every time I am done with mine I shut off the fuel and let it run out till it dies.