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360 cold start problem

J

j bertrand

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"this one has alot of people s

"this one has alot of people stumped. i own a 36 trojan with twin 360s. the starboard motor starts first time with a single pump of the throttle. the port one on a cold start with a pump of the throttle the engine fires for one burst. then turns over fine but won't fire. if i continue pump a few more times still nothing. if i wait a couple of minutes and try again it starts a little rough but picks up cyliders quickly and runs perfectly for the rest of the day. starts perfect each time. but the problem is the same if it sits 24 hours or more. compression is good. new plugs, wires, cap, rotor.fuel seperators are clean. carb and dist. rebuilt last spring. this has been a problem for a few seasons. can live with it but would rather not. idle is at 700 and never stalls but i also seemed to have lost 400 rpm at full throttle. any thoughts"
 
"Carter AFBs? If so, that&#39

"Carter AFBs? If so, that's part of your problem--they have a weak accelerator pump system (which also causes backfiring).

The other thing I see with many inboards is caused by the heat in the bilge, which causes gas in the carb to evaporate over a few days. When you start 'em up cold there's not enough gas in the carb bowl (or none) to allow the motor to idle properly; and the longer the motor has sat, the worse it gets.

I have to crank mine for an honest 10 seconds at times--and I'm pumping the throttles constantly the whole time.

Jeff

PS: A cure for the above--if you have the opportunity--is to fire up the engines and run them for 5 to 10 seconds before leaving the boat. The motors have to be stone cold for this to work, however (which is not usually possible)."
 
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