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Garden Tractors Discussion Forum

Re: Onan B48 twin 18h.p.

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Old Roy

01-27-2013 19:50:30

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Joe could this possibly the same with my engine.. don't really run rough like missing , but at less than half throttle (Not under power) it will surge bad.16 hp Onan with load on it runs great!

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joe csuti

01-28-2013 03:07:56

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 Re: Onan B48 twin 18h.p. in reply to Old Roy, 01-27-2013 19:50:30  
If your eng an onan(wh used both onan & kohler on 416)the most likely cause of surgeing is intake manifold sucking air at split or idle passages plugged/restricted in carb body,a left field possibility is previous owner was fooling with govenor setup.

Try the carb cleaner at split trick 1st,if no change in eng operation then consider disassembling carb,clean out all passages in body with a fine wire after soaking in carb cleaner,then blow out all passages with compressed air,get a kit for carb & rebuild or check on ebay for a new oem/aftermarket carb.

A quick & dirty trick you might try(I've had a 50/50 success rate with this method)pour 3-4 oz of seafoam gas treatment into tank & run 1-2 tankfulls of gas thru eng,if no manifold air leaks & eng operation doesn't improve with seafoam then consider cleaning/rebuilding or replaceing carb,you might also want to check on ebay for an eng service manual to check out govenor setup/operation.

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