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22 June 2010, 11:23
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#1
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Member
Country: UK - England
Town: PORTSMOUTH
Make: Avon 5.4, Avon 3.4,
Length: 5m +
Engine: Yamaha 90, Merc 30
Join Date: Sep 2003
Posts: 1,976
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spark plug issues
Chaps,
trying to fix up my 1996 Johnson 6hp, it runs but badly missing lots, I've had the carb apart and cleaned everything, I've done some research online and it appears to have the wrong plugs to start with - its pig to start once again its been on and needs constant throttle tweaks to keep going or constant high rpm
I gapped these 2 new ones (Champion Copper Core Spark Plug QL77JC4) to 0.30 with feeler gauges which I was told they will go well with the Johnson - the ends are wrong and I checked and they don't unscrew and therefore wont snap fit in to the HT lead -
The original ones in there are badly tarred ngk bh7s I believe are wrong type - wrong heat range and something else, however do have the correct threaded ends that do in to the HT lead -
Any recommendations chaps? thanks in advance
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22 June 2010, 13:23
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#2
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Member
Country: UK - England
Town: PORTSMOUTH
Make: Avon 5.4, Avon 3.4,
Length: 5m +
Engine: Yamaha 90, Merc 30
Join Date: Sep 2003
Posts: 1,976
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right I reckon I can just change the HT leads, anyone got any lying around?
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22 June 2010, 14:23
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#3
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Member
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
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Kit from an auto parts store should be cheap enough...
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22 June 2010, 17:53
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#4
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RIBnet admin team
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 13,054
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Try a bike shop, they usually have it on a reel.
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22 June 2010, 19:44
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#5
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Member
Country: UK - England
Town: southampton
Length: 4m +
Join Date: Jul 2009
Posts: 342
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Quote:
Originally Posted by ollyit
Chaps,
its pig to start once again its been on and needs constant throttle tweaks to keep going or constant high rpm
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dose it snatch at the pull cord when you try to start it?
sounds like the timing might be slightly out...
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22 June 2010, 21:17
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#6
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RIBnet admin team
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 13,054
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Your plugs should be ok, but need a wider gap than standard. Try 0.8mm to 1mm. QL77JC4 is direct equivalent to a BZ7HS-10, which is pretty much an NGK B7HS with a 1mm gap.
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22 June 2010, 21:22
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#7
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Member
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,299
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Quote:
Originally Posted by ollyit
the ends are wrong and I checked and they don't unscrew and therefore wont snap fit in to the HT lead...
...Any recommendations chaps?
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Do you have a lathe?
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23 June 2010, 15:36
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#8
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Member
Country: UK - England
Town: Southampton
Boat name: Hissing Sid
Make: Ross Smith Cobra
Length: 6m +
Engine: 200HP Optimax
MMSI: 235038046
Join Date: Jun 2002
Posts: 3,804
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Quote:
Originally Posted by ollyit
right I reckon I can just change the HT leads, anyone got any lying around?
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Yes, I have it on the reel, £2 per m and the correct NGK plug for your motor is a BR6HS, which I may have in stock, if not I can get them.
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