billbayliner
Chief Petty Officer
- Joined
- Jun 30, 2006
- Messages
- 553
Hello all: I am working on a 1986 Johnson 90 HP outboard for a friend and it has an issue of running strong for 5 minutes and then dying. It will still idle and putz along though. (This is what I am told and have not been in the boat while on the water)
It is hard to check out in my driveway with no load on the engine but I have did the basics including first checking plugs / gap and changing bad plug wires. I know this is not the issue but basics must be performed first.
Pulled the fuel pump filter and inspected and cleaned. Has a new fuel filter / water separater. Removed cracked fuel line.
Added some methyl hydrate to the gas tank incase water intrussion as this is a classic symptom of an inboard engine with water in tank. I told him to pull the fuel line and pop it in a fresh gan can and take it for a kick so we can pip the blame on contaminated gas or eliminate the issue.
I am not familiar at all with these 2 stroke Johnsons and thought maybe someone may have an experienced thought they could pass along.
I really do not want to spend a couple hours out on the lake in this cold October weather trouble shooting if I can come up with a possible fix with help from a member.
DAMMNN I just thought of something, plugged fuel tank vent. Will check this out but please post any other suggestions...
Stay tuned
Bill
It is hard to check out in my driveway with no load on the engine but I have did the basics including first checking plugs / gap and changing bad plug wires. I know this is not the issue but basics must be performed first.
Pulled the fuel pump filter and inspected and cleaned. Has a new fuel filter / water separater. Removed cracked fuel line.
Added some methyl hydrate to the gas tank incase water intrussion as this is a classic symptom of an inboard engine with water in tank. I told him to pull the fuel line and pop it in a fresh gan can and take it for a kick so we can pip the blame on contaminated gas or eliminate the issue.
I am not familiar at all with these 2 stroke Johnsons and thought maybe someone may have an experienced thought they could pass along.
I really do not want to spend a couple hours out on the lake in this cold October weather trouble shooting if I can come up with a possible fix with help from a member.
DAMMNN I just thought of something, plugged fuel tank vent. Will check this out but please post any other suggestions...
Stay tuned
Bill
