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Old 21 July 2016, 06:11   #1
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Country: UK - Wales
Town: Swansea
Make: HydroForce Nav Rapid
Length: under 3m
Engine: Johnson 4hp MY2000
Join Date: Sep 2015
Posts: 51
Johnson 4hp J4RSSM

Ignition Module Air Gap.

Does anyone here have a Johnson 4hp 1990-2001? (see image for the layout of this model)
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The service manual states that the air gap between flywheel and ignition module is ‘very sensitive’ but I am unable to find the actual gap quoted anywhere in the manual or on-line.

Before disturbing it, I had used feeler gauges and thought that it was measuring 0.3mm, but that was some time ago and I am now doubting my (senior) memory. I have asked brp.com and they sent me a couple of UK dealerships to ask but I have had no joy with them.

So my big ask is, if any one here has this model and a set of feeler gauges, would you be so kind as to measure the gap for me?
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Old 01 August 2016, 17:19   #2
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Country: UK - England
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Boat name: The Black Pig
Make: Ranieri
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Engine: 60c hp tohatsu
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Wills Marine Ltd - New Boat & Outboard Sales - Boat Storage - South Devon

I have this engine it's currently at Wills marine in Devon
They have been trading/ servicing Johnson engines for 20yrs +
V helpful give them a call
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Old 03 August 2016, 06:26   #3
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Country: UK - Wales
Town: Swansea
Make: HydroForce Nav Rapid
Length: under 3m
Engine: Johnson 4hp MY2000
Join Date: Sep 2015
Posts: 51
All sorted, thanks anyway.

Info:

Air gap on this model should be 0.51mm - 0.56mm.
If you haven't got the 'ring tool' (which I haven't) you will need 2 sets of feeler gauges.
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