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Gravitron releases air pressure before start of program

Decompresses before start of program

Posted by Anonymous on


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Posted on Jan 02, 2017

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SOURCE: Air leakage through pressure switch needle

1)Let your unit pump up.
2)Turn it off.
3)Find the supply line from the pump to the tank.
4)Remove the supply line from the pump head.
5a)If you hear air coming from the tank you have a bad check valve.
5b)If you do not hear air coming from the tank, you have a leaky
pressure switch.

Posted on Feb 02, 2009


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The decompression mechanism is located on the cam shaft, the engine would have to be opened up from the crank case, the whole decompression mechanism should be replaced...

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Honda 2600 psi pressure

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This is a problem with GC-160 and GC-190 engines on pressure washers, tillers, etc. Once they get some hours on them and as things seat in-wear in, they get to a point you can not pull the start cord. If you remove the spark plug, the engine turns easily. The valves need adjusted. The valves are set .005" to .006" off the seat. This allows enough compression release but the engine runs. I find the valves need adjusted every 25 hours, not the 100 hours Honda states.

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push the kick start through until you get to a hard spot(TDC) then hold the decompresser and kick it just a little more to get it past top dead centre. release the lever
then one good kick, do not touch the throttle, even hold the bar not the grip so your not tempted to give it a squirt.

If it also has the hot start lever, or button this is for when the bike is quite hot and it leans out the mixture for starting, activate the lever and start the bike, then release the lever. This also helps if youve had a little lie down and the bike is flooded

what also helps starting is
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1 Answer


I have one of these also. Push lightly on kickstart until compression is felt. Pull in the decompression lever and press kickstarter down another 2 inches, release the decompression lever, and and then let up on the kickstarter to get a full swift kick. It seems like alot to do, but once you get the hang of it, it really is easy. Also, I upgraded the copper spark plug (NGK CR8E) to an Iridium one (NGK CR8EIX) and it made it much easier also.

Also, I have heard that an exhaust cam from an ' 03 YZ450F has the same cam lobes, but with the built in auto-decompress will swap straight into this bike, I was looking into doing this with mine, but just got so good with the above procedure I did not waste the money on it.

Mar 09, 2011 | Yamaha YZ 426 F Motorcycles

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My compressor builds to 125 psi then shuts off like it should then when the pressure is released the compressor wont start back up. Sometimes it will attempt to start and it sounds like the motor is...

When a compressor reaches set pressure, there should be a release of air from discharge hose thru the unloader. This release of air unloads the compressor head pressure. The unloader is usually located within the pressure switch. Easy to check. Follow discharge hose from compressor head to tank. There should be a brass/steel checkvalve at the tank. The checkvalve allows air to enter tank, however not allow air to be released back into discharge hose. If this valve is leaking, air will be released from the unloader constantly. Follow 1/4" tubing from checkvalve to unloader and listen for leaks. Repair as needed. If air is not leaking from checkvalve then check unloader mechanism with-in pressure switch. Parts are available at Good luck

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Weird (Pressure Release) Noise After The Door Has Been Closed

The freezer being closed up tight and so cold can create a negative pressure inside. This negative pressure will cause the door to be very hard to open and could pull the door closed too quickly. Most manufactures today use small air valves the open and release as the door is being opened and closed. They are most often found on the bottom of the door itself or sometimes in the cabinet behind the back wall.

The noise is perfectly normal, my wife says it is there to alarm her when I am eating too many ice cream bars.....

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2 Answers

230 suzuki sport. should i decompress to kickstart engine ? really hard to start. just got this 230 together and have never started it b4 thanks in advance dennis

Yes.Hold the decom and give it 2-3 kicks.Release it and slowly kick it untill pressure builds up.Pull in the decom and move the kickstarter a very small amount to get the piston very close to t.d.c..Now,give it a full kick and at the same time release the decom.Hope this helps you

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Unplug the solenoid valve from the bottom of the power supply and plug it directly into a wall outlet. That should actuate the valve to release the air. If that doesn't work you will need to replace the valve. Good luck.

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