Mariner 20hp standard shaft, pull start, Year: 2013

by Jon
(Sheffield, Yorkshire, UK.)

Bought the engine new, condition is still like new with no more than 25 hours use since new. Engine starts & runs perfect from cold & allows very slow speed when leaving a slipway/jetty/pontoon etc. However, when the engine has reached normal running temperature, should I need to return to either tick-over (idle) in neutral or especially if I engage forward gear for slow manoeuvring, the engine stalls (cuts out) on me each & everytime. This problem hasn't started recently, it's been there since day one.
Any advice would be most appreciated,
Thanks in anticipation.
Regards
Jon.

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