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Hot!Generator GP7500e model # 0059432 would not start, then started and run on 2020RPM

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leo
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2017/01/15 19:19:53 (permalink)
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Generator GP7500e model # 0059432 would not start, then started and run on 2020RPM

Generator GP7500e model # 0059432   would not start, then started and run on 2020RPM the throttle full open, voltage 85V/180V ,when I removed air filters RPM went up to 2600RPM.air filter have gas/oil deposit .I have removed and cleaned  carb ,air filters steel same problem, then I purchased new carb, replaced it- steel same problem. Than;
Checked fuel line and fuel shutoff valve
Replaced gas a few time 
Checked compression  50PSI
Removed cylinder head, cleaned carbon, lapped valves ,replaced cylinder head  gasket , assembled, adjusted overhead valves, tested with  leak-down tester ,had less than 10%
Readjusted air gap of ignition module
Inspected the flywheel and key
Inspected the governor linkage
Replaced spark plug, was carbon deposits, the air gap was o.k.

So far I have no success.  

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    Roy
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    Re: Generator GP7500e model # 0059432 would not start, then started and run on 2020RPM 2017/01/15 22:06:55 (permalink)
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    Disconnect the generator brushes and see what happens. You say you have 50 psi compression yet 10% leak down which indicates a healthy engine. Something doesn't compute.
    leo
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    Re: Generator GP7500e model # 0059432 would not start, then started and run on 2020RPM 2017/01/15 22:32:50 (permalink)
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    Thanks, 50PSI before I reassembled and lapped valves,than I used leack down testers and found less than 10% leack.Than I checked the alternator ,disconnected brashes ,but could not found any problem.
    Appreciate your assistance.
    Mikel1
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    Re: Generator GP7500e model # 0059432 would not start, then started and run on 2020RPM 2017/01/16 11:50:16 (permalink)
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    How is the oil level? Any fuel in oil? Choke operating properly?
    With rpms raising with air filters off then it's running on the rich side.
    leo
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    Re: Generator GP7500e model # 0059432 would not start, then started and run on 2020RPM 2017/01/16 13:45:05 (permalink)
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    Hi, .Mike
    Oil level is O.K. The choke operate properly and no fuel in the oil .You are right it's running on rich side, every time when I check spark plug ,one is covered with black carbon. I do not have any problem to start generator , but I am thinking about ignition module  is it possible low RPM because defective ignition module? The armature gap I  readjusted to 0.5mm.
    Thanks.
    Mikel1
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    Re: Generator GP7500e model # 0059432 would not start, then started and run on 2020RPM 2017/01/16 21:15:10 (permalink)
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    If you manually move throttle on carb, will it speed up?
    leo
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    Re: Generator GP7500e model # 0059432 would not start, then started and run on 2020RPM 2017/01/16 22:09:20 (permalink)
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    The throttle after start staying in fool open position, l can move manually to close position and  RPM go down.
    Thanks.
    Mikel1
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    Re: Generator GP7500e model # 0059432 would not start, then started and run on 2020RPM 2017/01/16 22:42:51 (permalink)
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    Okay, if you spray a squirt of carb cleaner or starting fluid into carb while running full throttle does it speed up?
    Do you have an inline spark tester?
    leo
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    Re: Generator GP7500e model # 0059432 would not start, then started and run on 2020RPM 2017/01/17 08:35:59 (permalink)
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    I never use this preciger, but will do it today, remove air filter and sguir carb cliner ,is it what you recommend to do? ,and I do have in- line ignition spark tester.
    Thanks . Mikel
    Mikel1
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    Re: Generator GP7500e model # 0059432 would not start, then started and run on 2020RPM 2017/01/17 09:54:50 (permalink)
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    That is correct, start it up to full throttle and no choke. Then give it a shot of carb cleaner.
    On your spark tester is it the small bulb one?
    leo
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    Re: Generator GP7500e model # 0059432 would not start, then started and run on 2020RPM 2017/01/17 10:47:22 (permalink)
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    I did it. 1  ignition system, lights of in- line tester bright and and did not iven fliking.
                 2. When I sprayed carb cleaner the engine tried to stop,RPM instantly whent down .
    It was no problem to start my generator today,choke funkshen properly, whis folly open position engine speed 2120RPM, when I removed filter element 2400RPM but a lot of fumes coming from intake and inner filter socked some gasoline it was whet and smell of gasoline.
    Appreciate your help, MIkel. 
     
    Mikel1
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    Re: Generator GP7500e model # 0059432 would not start, then started and run on 2020RPM 2017/01/17 21:20:00 (permalink)
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    So two different carbs and the same problem. Sort of reminds me of a thread on another forum where the member had a similar problem. It wouldn't rev up to operating speed, turned out to be that the camshaft lobes were worn down. However the speed would increase when moving governor arm.
    leo
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    Re: Generator GP7500e model # 0059432 would not start, then started and run on 2020RPM 2017/01/17 21:34:34 (permalink)
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    My generator have 7 hours on counter. Today I took apart my original carb and cleaned , cleaned spark plug and same thing. Worn camshaft???
    Thanks.
    Mikel1
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    Re: Generator GP7500e model # 0059432 would not start, then started and run on 2020RPM 2017/01/17 22:01:01 (permalink)
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    I see, didn't realize it had so few hours on it.
    Running out of ideas here perhaps someone else has another idea.
    With it in full throttle, throttle plate is fully opening and not achieving propers rpms is puzzling. Seems odd that two different carbs would both be rich.
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