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Maybe you are running too lean. When the choke is on it reduces (chokes) the air being drawn in meaning higher fuel to air mixture (richer because of more fuel and less air). Turn the choke off and more air is drawn in and the fuel to air mixture is reduced. There should be a mixture screw where you can alter the mixture to the required setting for normal running.
turn the mixture screw all the way in then back it out between 1 1/2 turns to 2 turns
that will get the engine to idle from there set the idle speed with the throttle screw to desired idle rpms
now turn the mixture screw in slowly until you see/hear a fall in rpms
now screw the screw out until again you hear /see a fall in rpms.
half of the number of turns back in from in to out will be the desired air /fuel mixture setting
adjust the idle with the throttle screw if it has altered
you can repeat the procedure again to fine tune the mixture after adjusting the throttle screw
The onboard computer maintains an air/fuel mixture at 14.7 to 1, if one of the oxygen sensors is failing it will change the air/fuel mixture for engine combustion. When this happens the onboard computer detects that the air/fuel mixture is out of range and sets the "check engine light" to come on, on the dash. When the computer is scanned for fault codes it will relay back information as to the cause of the problem. If an oxygen sensor is detected as operating out of its range, a specific code number is displayed through testing equipment that reads 'fault codes' and it will display which one is faulting. Hope this helps.
If it is a carbed model then you will have to re jet the carb and reset the fuel air mixture for the new aftermarket exhaust. I would also put a free flowing air cleaner on it to help with the new exhaust.
well your fuel mixture is automatic the ecu and sensers do it all for you ie: your airmass flow meter measures the air and the then tells the ecu how much fuel to put with the air so it runs correctly and combustion is either petrol or diesel petrol is flammable and diesel is just pure compresion and nothing else really
Most ready heaters have a fuel pressure setting on the back of the heater near the fan. There should be two small plastic covers, looking directly at the back, the one on the left can be removed and a pressure gauge installed. The one on the right is slotted for adjustment of pressure. I think the correct pressure for that model is 3.0 lbs.
15 hp 2stroke OSPREY outboard
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