problems with Johnson 35hp 2 stroke (seahorse)
 

purchased my first boat around 6 months ago, was running real rough,
problem turned out to be a sparkplug, now since having them replaced,
the boat runs beutiful, accept after its been running flat out for
about a minute it starts to loose power and start slowing down,
splutters a little but not to much, but once you let it run slowly for
a bit, it will again go flat knacker and loose power again after about
a minute, does anyone have any idea what this could be in relation
too?

running a 20:1 mix which is what previous owner has told me to use.

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problems with Johnson 35hp 2 stroke (seahorse)
 

flwlss wrote:
purchased my first boat around 6 months ago, was running real rough,
problem turned out to be a sparkplug, now since having them replaced,
the boat runs beutiful, accept after its been running flat out for
about a minute it starts to loose power and start slowing down,
splutters a little but not to much, but once you let it run slowly for
a bit, it will again go flat knacker and loose power again after about
a minute, does anyone have any idea what this could be in relation
too?

running a 20:1 mix which is what previous owner has told me to use.


Try 50:1 w/ TCW-3.

It sounds like you are running too lean @ WOT.

What is the model number?

Rob

problems with Johnson 35hp 2 stroke (seahorse)
 

trainfan1 wrote:
flwlss wrote:

purchased my first boat around 6 months ago, was running real rough,
problem turned out to be a sparkplug, now since having them replaced,
the boat runs beutiful, accept after its been running flat out for
about a minute it starts to loose power and start slowing down,
splutters a little but not to much, but once you let it run slowly for
a bit, it will again go flat knacker and loose power again after about
a minute, does anyone have any idea what this could be in relation
too?

running a 20:1 mix which is what previous owner has told me to use.


Try 50:1 w/ TCW-3.

It sounds like you are running too lean @ WOT.

What is the model number?

Rob
Sounds like a clogged vent in the gas tank or a bad hose. Borrow a new
portable tank and try it.

--
Del Cecchi
"This post is my own and doesn’t necessarily represent IBM’s positions,
strategies or opinions.”

problems with 1976 Johnson 35hp 2 stroke (seahorse)
 

thanks guys found out 50:1 is the ratio i should have been using and
the problem turned out to be the vent on the fuel tank was rusted and
not breatheing....

"flwlss" wrote:
purchased my first boat around 6 months ago, was running real
rough, problem turned out to be a sparkplug, now since having
them replaced, the boat runs beutiful, accept after its been
running flat out for about a minute it starts to loose power
and start slowing down, splutters a little but not to much,
but once you let it run slowly for a bit, it will again go
flat knacker and loose power again after about a minute, does
anyone have any idea what this could be in relation too?

running a 20:1 mix which is what previous owner has told me to
use.