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

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

Honda Air Tools... | Answered on Aug 27, 2019

they are marked on the gears arrow goes to dot

Honda Quincy 17... | Answered on Jul 11, 2019

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

Honda Generator... | Answered on May 31, 2019

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

Honda Quincy 17... | Answered on Nov 18, 2017

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

Honda Ev4010... | Answered on Sep 25, 2017

take it in to honda dealer for a warranty check

Honda Generator... | Answered on Aug 25, 2017

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

Honda Portable... | Answered on Mar 19, 2017

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 start

Honda GX340 HGI Partsf21c43c2-def4-46c5-9224-ed46701c0c01.jpghonda-gx340-revving-high-all-time-some-qkhmqzcwln4tohiil4ndbnz4-2-2.jpg

Honda Gx340 Gas... | Answered on Jun 22, 2016

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

Honda Gx340 Gas... | Answered on Apr 20, 2016

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.

Honda 2008... | Answered on Mar 17, 2016

Not finding what you are looking for?
Honda Logo

169 questions posted

Ask a Question

Usually answered in minutes!

Top Honda Air Tools & Compressors Experts

John Trevino

Level 3 Expert

1420 Answers


Level 3 Expert

85216 Answers

Lawrence Oravetz

Level 3 Expert

10543 Answers

Are you a Honda Air Tool and Compressor Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides