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Old 11-02-2006, 01:44 PM   #1
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Question My Gen.is propane and turns over and starts but I think it needs a tweak of sorts.I think it turns over to long before starting.A 7000 Onan .Any one have a fix?I think a choke adjustment but I'm not in to propane,gasoline I could adjust.Help if You know how or what I need to do...Bushman
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Old 11-02-2006, 01:44 PM   #2
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Question My Gen.is propane and turns over and starts but I think it needs a tweak of sorts.I think it turns over to long before starting.A 7000 Onan .Any one have a fix?I think a choke adjustment but I'm not in to propane,gasoline I could adjust.Help if You know how or what I need to do...Bushman
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Old 11-02-2006, 03:17 PM   #3
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Bushman, since you did not say how many hours are on the unit, This info may or maynot apply to your situation. If your pressure regulator is working properly the most likely other thing is your spark plugs. Propane rigs are VERY FINICKY when the spark plugs get older (More than 500 hours - sometimes less) and they must be the correct heat range - Stay with the manufacturers recommended PLUGS. Gasoline is much more forgiving with worn plugs than is PROPANE. While you have the plugs out, be sure to check that you also have a strong spark to the plugs. I do not think you have a function choke on that unit, most of the larger propane gensets do not use a choke or the choke will be set to stay open at all times.
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Old 11-02-2006, 04:57 PM   #4
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Thanks for the info.Glen about the hours I am sure they are very low.I will look in the A.M.and post the findings.I will wait for a few come backs before I do any changes at all.I will change plugs if I have no other fixs but think fuel is not getting to the carb very fast.It starts and runs great after it spins over for at least 1-2 minits thats not good for starter..John
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Old 11-02-2006, 05:03 PM   #5
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I have a 6.5 which is propane like yours. Mine used to take 4-5 tries to crank and start. Then:
1. I replaced the air filter
2. I replaced the spark plugs with Onan parts.
3. I make sure to exercise the genset once each month under load as recommended.

My genset now fires on the 2nd try. I think it needs to first crank to get the fuel flowing.
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Old 11-02-2006, 05:12 PM   #6
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Chasfm11..Air filter.That may be the reason plugged up a sure thing on My list for morning.any ouher thoughts I am all ears.Got to be a minor thing as I said runs so sweet after starting..John Had to say You Men are both from The Lone Star..
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Old 11-08-2006, 12:08 AM   #7
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Just one comment here. My (new to me) MH uses gas, not propane. I have a home gen-set that I have converted to propane however. When I turn on the gas (manual valve) I always wait about 10 sec for the bottle-gas to push through the hoses to the carb. There is no choke. Usually fires on the first or second try. Also, I have NEVER replaced a spark plug in over 25 YEARS !! Plug is original and is still clean.

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Old 11-08-2006, 12:54 AM   #8
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If your unit has a tube pointing down from the gas pressure regulator, check it to see if a mud dobber built a nest in the tube. We have had to clean these out quite a bit this past summer when they were hard starting. Good luck and let us know what you find to be the problem.
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Old 11-08-2006, 03:34 AM   #9
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Thanks for the tips I will check to see if I have the mud in the pipe.That may be it I know it is some thing simple for when it gets the fuel and runs so nice I also checked the hours on it 139 that's not many in 5 years is it?And oil changed every year should be as new...Bushman
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Old 12-19-2006, 09:07 AM   #10
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I have done a number of small engine propane conversions and the common complaint is how long it takes to start without a using a pre-charger.
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Old 04-06-2007, 07:12 PM   #11
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I have the same Problem with mine. Will start after 4 or five trys and some time no mater what I do it will not start. I was doing a search when I found this topic..



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Old 04-13-2007, 05:29 AM   #12
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I have an Onan 6.3 kw propane generator and it starts right up. I have less than 100 hours on it although it is seven years old. Last time I checked the propane is fed to the generator at full pressure, not regulated. My recommended service schedule is below:

o Change engine oil and filter every 150 hours or once a year (also after the first 50 hours)
o Clean spark arrestor every 50 hours

o Replace the air filter every 150 hours or once a year

o Replace choke sustain valve every 300 hours

o Clean engine cooling fins every 300 hours

o Replace spark plugs every 500 hours

o See Onan manual for other 500 hour maintenance
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