Thread Tools Search this Thread
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 .

m chappelow is offline   Reply With Quote
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.

colcreate is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 09:27.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.