G'DayG'Day
New member
I have a 1997 25HP 2 stroke (third hand, doesn't look like its done too much work).
It has a HUGE amount of white smoke coming from the propeller.
I'm not particularly good with machines, but have followed the videos at the top of this page and have done some minor servicing, (carby kit - runs great - and impeller etc, all working fine).
It runs fine, but coughs and stalls every now and then when idling (while smoking badly)
It ran clean with no smoke when run dry with no water, then smoked when I turned the hose on. So I'm assuming water is getting in to the cylinders pre ignition and is being burnt?
I've removed the thermostat - it worked fine, and no blockages.
I've removed the head gasket, it didn't look like there was any obvious leaks or incursion of water.
The centre of the head looks be be slightly concave by about 1-2mm (could this be the cause?) The face of the block seems flat.
I was expecting to see an obviously blown head gasket, but as an amateur it looks OK...
I'm wondering if it could be the pistons? How do I check this?
I'm also wondering if it could be reed valves? (might be the coughing and stalling?) But can't see how this would this cause white smoke.
Any suggestions welcome on what else i should consider.
It has a HUGE amount of white smoke coming from the propeller.
I'm not particularly good with machines, but have followed the videos at the top of this page and have done some minor servicing, (carby kit - runs great - and impeller etc, all working fine).
It runs fine, but coughs and stalls every now and then when idling (while smoking badly)
It ran clean with no smoke when run dry with no water, then smoked when I turned the hose on. So I'm assuming water is getting in to the cylinders pre ignition and is being burnt?
I've removed the thermostat - it worked fine, and no blockages.
I've removed the head gasket, it didn't look like there was any obvious leaks or incursion of water.
The centre of the head looks be be slightly concave by about 1-2mm (could this be the cause?) The face of the block seems flat.
I was expecting to see an obviously blown head gasket, but as an amateur it looks OK...
I'm wondering if it could be the pistons? How do I check this?
I'm also wondering if it could be reed valves? (might be the coughing and stalling?) But can't see how this would this cause white smoke.
Any suggestions welcome on what else i should consider.