General Patton
New member
ok pulling my hair out with this now, need help !!
I have a DT65 Suzuki oil injection, I think its 1980s cant seem to match serial number for precise year. Anyway. Bought this motor and the guy I got it from said it needed a bit of work to get it going and explained it had an issue with water leaking from head. He wasnt wrong !! Head Gasket.
What ive done so far.
New Head, and Water cover gasket. Full carb clean. (twice Actually) a good detailed clean at that. Reed valves looking good too. Oil filter cleaned was in good condition. New spark plugs set to 0.9. NKG,s. Fuel pump rebuild. Though I dont feel its needed, I have ordered new diaphragm anyway. in post now. Thats another thing eliminated. adjusted mix screws 2 turns out. new fuel. New oil. And start... Success, She kicked into life. Put it on muffs and all seemed well. Went into gear up and down revs ok, so took it to local lake for a test spin.
launched after a quick start at bank and all seemed good. Maybe sounded a little rough, but was thinking I will tune it out on water. As soon as I gave it a bit of throttle she dies. Sounded like it was starved, So I tried again and it started up ok this time, will even rev up in neutral. Managed to tickle it up a few revs but then felt like it was limited or restricted.( I will come back to this) I had a quick look seen that the plug was wet with fuel. Initially I thought must be spark problem.
Took boat back to yard, back on muffs and discovered that its only running on 2 cylinders, top cylinder is not firing. changed around the HT leads and problem remains in No 1 cylinder. (ruling out HT leads or coil issue). I have a compression tester coming to do full test in a few days but I am certain ive got good compression and good fuel and good spark. I did noticed that the spark on cylinder 1 gave me a bit of a shock and spark was jumping outside of plug to my hand. sort of all over the place when I touched it, a bit different from the other 2.
My question is this, what would cause a miss in one cylinder if you have compression, spark and fuel. where should I look next to get this cylinder to run. I was thinking maybe magnetos. Timing am I on the right path. If anyone can shed any light it would be a massive help.
Also Coming back to Oil injection issues. Can someone shed any light on the oil sensor limiting revs. I dont have a rev counter but im sure its holding around 2000rpm when it does go on the the 2 cylinders. Its full of oil and the oil light is still showing. Thinking faulty sensor. However I tried to by pass sensor by joining plug wires telling system level is full then hit the reset button while engine was running and this didnt put the oil light out. Again any info would really help me not go bald.
Thanks for sticking with me and hope there is some expert guy out there that can teach me a few things.
I have a DT65 Suzuki oil injection, I think its 1980s cant seem to match serial number for precise year. Anyway. Bought this motor and the guy I got it from said it needed a bit of work to get it going and explained it had an issue with water leaking from head. He wasnt wrong !! Head Gasket.
What ive done so far.
New Head, and Water cover gasket. Full carb clean. (twice Actually) a good detailed clean at that. Reed valves looking good too. Oil filter cleaned was in good condition. New spark plugs set to 0.9. NKG,s. Fuel pump rebuild. Though I dont feel its needed, I have ordered new diaphragm anyway. in post now. Thats another thing eliminated. adjusted mix screws 2 turns out. new fuel. New oil. And start... Success, She kicked into life. Put it on muffs and all seemed well. Went into gear up and down revs ok, so took it to local lake for a test spin.
launched after a quick start at bank and all seemed good. Maybe sounded a little rough, but was thinking I will tune it out on water. As soon as I gave it a bit of throttle she dies. Sounded like it was starved, So I tried again and it started up ok this time, will even rev up in neutral. Managed to tickle it up a few revs but then felt like it was limited or restricted.( I will come back to this) I had a quick look seen that the plug was wet with fuel. Initially I thought must be spark problem.
Took boat back to yard, back on muffs and discovered that its only running on 2 cylinders, top cylinder is not firing. changed around the HT leads and problem remains in No 1 cylinder. (ruling out HT leads or coil issue). I have a compression tester coming to do full test in a few days but I am certain ive got good compression and good fuel and good spark. I did noticed that the spark on cylinder 1 gave me a bit of a shock and spark was jumping outside of plug to my hand. sort of all over the place when I touched it, a bit different from the other 2.
My question is this, what would cause a miss in one cylinder if you have compression, spark and fuel. where should I look next to get this cylinder to run. I was thinking maybe magnetos. Timing am I on the right path. If anyone can shed any light it would be a massive help.
Also Coming back to Oil injection issues. Can someone shed any light on the oil sensor limiting revs. I dont have a rev counter but im sure its holding around 2000rpm when it does go on the the 2 cylinders. Its full of oil and the oil light is still showing. Thinking faulty sensor. However I tried to by pass sensor by joining plug wires telling system level is full then hit the reset button while engine was running and this didnt put the oil light out. Again any info would really help me not go bald.
Thanks for sticking with me and hope there is some expert guy out there that can teach me a few things.
