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Old 27 June 2012, 06:53   #1
TheMadMariner's Avatar
Country: UK - England
Boat name: SeaRider SR4
Make: Avon
Length: 4m +
Engine: 55HP Yam
Join Date: Mar 2011
Posts: 28
Mercury 18 Hp timing

Hey there chaps,
I think the Idle spark timing on my Mercury 18HP is off. It's out of the 18/20/25 hp series build from '84 to '87. It will idle very rough with the primer engaged, otherwise it will stall out..I know this won't be the entire problem, but I just want to rule this out.
However, this model doens't have a regular numeral marks on the flywheel, but has dots instead, I will include a photo very soon.

Anyone a guess how i'm supposed to read this?
Thanks a lot in advance!

"Only the dead have seen the end of boating.."
TheMadMariner is offline   Reply With Quote
Old 27 June 2012, 10:05   #2
Country: UK - England
Town: bicester
Length: no boat
Engine: outboard only
Join Date: Feb 2009
Posts: 913
you could buy the factory issued service manual, if you do have the s/n handy in case its required then all will be explained, you will also need a timming light and a rev counter to do it properly, it reads hard but it is an easy job with the correct tools
uncle al is offline   Reply With Quote

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