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Old 23 August 2013, 11:27   #11
m chappelow's Avatar
Country: UK - England
Town: yorkshire
Boat name: little vicky
Make: avon ex RNLI
Length: 3m +
Engine: tohatsu
Join Date: Mar 2008
Posts: 2,310
[QUOTE="new ones they are about 1/16th longer from nut to spark brought them from marine shop who compared old with the new ones.
tried with choke out and in and more revs.[/QUOTE]

Could be that if the spark plugs are long reach ones the piston is touching the electrode & is closing the gap slightly .

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Old 23 August 2013, 12:05   #12
colcreate's Avatar
Country: UK - England
Town: Cheshire
Boat name: Gollione
Make: Avon Searider 5.4
Length: 5m +
Engine: 90hp
Join Date: Jun 2010
Posts: 347
Spark plugs for a 1997/8 Selva 9.9 (in fact most models) is BOSCH W7B or CHAMPION L 87 or equivalents. 20thou gap is recommended but anything close except a dead short should at least fire.
A copy of the parts manuals is on my server here:
Might be useful for wiring diagram....
Owners manual here:
Check out the starting procedure!

A compression test would of course be handy and should be over 100psi and within say 10% of each other although even poor compression engines will at least fire up even if they wont run well. When trying to start before putting fuel in the bores were the plugs wet?

I'm going on holiday now so will not be posting much over the weekend.
Good luck.

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