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Hi there. i live in a remote place and rely absolutely on my boat and motor. Also , at home, we have very little signal, so i may seem inattebtive getting back, if anyone can help. (I'm in a bigger island now , where there is a connection.)
THE MOTOR..
Yamaha 60 4-stroke, high thrust.
3˝years old
1100 hrs, (so about 6 per week in three trips).
ALL maintenance at correct intervals.
Prop good.
oils good, filter new
fuel filters good.
plugs all new.
foot sound.
tried replacing the gas, from a different source.
THE PROBLEM..
intermittent irregular juddering at 1200 rpm up.
ONLY when in either gear, in neutral revs normally.
Only revving to 3800 ish rpm when fault present .
When fault not present revving to 5000..normal. (still a little irregular at low revs, say between 1000 and 250rpm)
The signifcant things seems to me.
ONLY manifest in gear..
Only sometimes.
Thanks. (sorry if i seem abrupt.. under a lot of pressure!)
THE MOTOR..
Yamaha 60 4-stroke, high thrust.
3˝years old
1100 hrs, (so about 6 per week in three trips).
ALL maintenance at correct intervals.
Prop good.
oils good, filter new
fuel filters good.
plugs all new.
foot sound.
tried replacing the gas, from a different source.
THE PROBLEM..
intermittent irregular juddering at 1200 rpm up.
ONLY when in either gear, in neutral revs normally.
Only revving to 3800 ish rpm when fault present .
When fault not present revving to 5000..normal. (still a little irregular at low revs, say between 1000 and 250rpm)
The signifcant things seems to me.
ONLY manifest in gear..
Only sometimes.
Thanks. (sorry if i seem abrupt.. under a lot of pressure!)
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