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Garden Tractors Discussion Forum

allis 720, cckb onan engine

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fmcgoo

09-03-2007 16:01:46




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I HAVEE AN ALLIS 720 WITH THE CCKB ONAN ENGINE AND IT HAS STARTED RUNNING TERRIBLE. I HAVE CLEANED THE SIDE DRAFT CARBURETOR AND CHECKED THE TIMING WHICH IS OK. THE CARB ADJUSTMENTS WERE SET PER THE MANUAL STILL IT RUNS BAD IT SEEMS TO RUN QUITE GAS RICH CAUSING IT TO BACKFIRE.
I'D LIKE SOME SOURCES FOR NEW AND POSSIBLY USED CARBURETORS. THANKS FMCGOO




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fmcgoo

09-11-2007 06:37:00




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 Re: allis 720, cckb onan engine in reply to fmcgoo, 09-03-2007 16:01:46  
THANKS FOR ALL THE COMMENTS,AFTER RECEIVING THEM I STARTED LOOKING HARDER AT THE POINTS AND YES THE CONDENSER WHICH TURNED OUT TO BE THE SPOOK IN THE PROBLEM. I REPLACED THE CONDENSER AND THE OLD GIRL RUNS LIKE A NEW ONE.
I HAVE NEVER HAD A CONDENSER ACT IN THIS MANOR IN ALL MY YEARS OF WORKING ON ENGINES MY EXPERIENCE IS THEY EITHER WORK OR DON'T WORK. AGAIN THANKS TO ALL. FMCGOO



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Doug Dolson

09-11-2007 05:05:44




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 Re: allis 720, cckb onan engine in reply to fmcgoo, 09-03-2007 16:01:46  
I have a 720 same problem change the condenser



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Jim P (MI)

09-04-2007 09:16:43




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 Re: allis 720, cckb onan engine in reply to fmcgoo, 09-03-2007 16:01:46  
How'd you set the points? What do they look like? What plugs do you have in it?

JP

248 974 6257



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fmcgoo

09-04-2007 10:50:48




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 Re: allis 720, cckb onan engine in reply to Jim P (MI), 09-04-2007 09:16:43  
I SET THEM WITH A .020 INCH FEELER GAUAGE THEN CHECKED BY THE LIGHT METHOD. THEY LOOKED GOOD.
PLUGS ARE CHAMPION J12YC. FMCGOO



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Jim P (MI)

09-04-2007 11:07:28




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 Re: allis 720, cckb onan engine in reply to fmcgoo, 09-04-2007 10:50:48  
If the points are in good shape, they need to be 'dead on' w/timing light. I think the J12yc's are close (a little short & a little hotter), The Champion plug is H10C (?) I use NGK B6L, I find them a little more 'better'. A lot like AC or Autolite.

do you have ANY oil or oil residue in the points box?



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fmcgoo

09-04-2007 11:37:19




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 Re: allis 720, cckb onan engine in reply to Jim P (MI), 09-04-2007 11:07:28  
NO. FMCGOO



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Dude11

09-03-2007 17:11:17




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 Re: allis 720, cckb onan engine in reply to fmcgoo, 09-03-2007 16:01:46  
Not sure what CCKB is or stands for,but if it has points ck the clearence,I have a 1977 Onan that barely ran when I bought it.Cked the points after trying to adjust carb.and found them almost shut,I cleaned sanded and reset,now it runs great,good luck,Dude11



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fmcgoo

09-04-2007 07:55:37




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 Re: allis 720, cckb onan engine in reply to Dude11, 09-03-2007 17:11:17  
thanks for the comeback , i should have also pointed out that when timing i also set the points to .020inches. fmcgoo



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