Carb ajusting 18hp onan
Posted February 09, 2016 - 09:33 AM
Posted February 09, 2016 - 10:40 AM
Posted February 09, 2016 - 10:59 AM
Runs and starts is good. Once I get mine to that point I'll set the idle to where it sounds good by ear, then go to 1/2 throttle and slightly tweek if needed, then go WOT with a load (deck enguaged) and tweek if needed. The tweeks are usually just a smiggion adjustment "if needed". Then back to idle. Repeat as needed.
Points are another factor with the carb adjustment. A clean air filter is a must.
- MH81, Texas Deere and Horse and 6mikey7 have said thanks
Posted February 14, 2016 - 03:43 PM
Posted February 14, 2016 - 06:09 PM
From the Onan BF and BG Service manuals:
Carburetor Float Adjustment
1. Invert float assembly and casting.
2. With the float resting lightly against the needle and seat, there should be 1/8" of clearance between the bowl cover gasket and the free end of the float.
3. If it is necessary to reset the float level, bend the float tangs near the pin to obtain 1/8" clearance (figure 6).
Edited by JiminRI, February 14, 2016 - 06:11 PM.
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Posted February 14, 2016 - 06:31 PM
I'd like to emphasize: "2. With the float resting lightly against the needle". Inverting the carburetor like the picture isn't resting lightly. If there is a spring in the needle you may get wrong results.
Start with the carburetor right side up and rotate it until the needle just closes. Measure in that position.
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Posted February 15, 2016 - 01:54 PM
I have seen a "helper spring" on one of the forums, but the stock carb on the Onan BS/MF 16 hp in my SS-16 does not have a spring on the float so don't be surprised if your carb doesn't have one. If it does, that sounds like good advice to me.