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Old 09 February 2012, 19:08   #71
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hi this is a good link

http://www.ngksparkplugs.com/tech_su...qs/faqread.asp
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Old 10 February 2012, 03:54   #72
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I've seen worse plugs. Can't see the tips properly in the photos. The wet/oily/black appearance could be from trying to start the engine. You need to pull them after the engine has had a good run & got upto temp & have a look at them then. It won't hurt to replace them & get a couple of spares. Make sure that they are gapped correctly before you fit 'em.
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Old 10 February 2012, 05:35   #73
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surely you notice the condition of the plugs when you did the compression test before you bought it.....or have they corroded since .. eek
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Old 10 February 2012, 17:48   #74
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Had a look in fuel tank and found water in it. saved as much fuel as I could and chucked the rest. took out drain screws in top and middle carb and flushed them through (I couldn't get to bottom one) going to pop in to BHG tomorrow to get them to undo it.
The engine ran MUCH better, would run for 4-5 mins if left to idle before slowly dying out. If I increased revs for a few seconds then back to idle it would take another 4-5 mins before dying. does this sound like a problem with one carb and would flushing it out solve it?
Also fitted new spark plugs and topped up on oil.
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Old 11 February 2012, 04:11   #75
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Sounds like the carbs to me. Try new plugs after gapping properly, fresh fuel (including cleaning fuel filer bowl on engine), also worth investing in external fuel filter. Just a thought - but have you checked condition of thermostat?
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Old 11 February 2012, 08:47   #76
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Thanks spartacus, what does the thermostat control? I will be investing in a external fuel/water separator. Drained the 3rd carb today. BHG marine were extremely helpful as usual, had it all done in 30 mins including testing engine. went out for a quick trip to the IOW and back and all seemed ok. Anyone up for a solent blast?
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Old 11 February 2012, 09:04   #77
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Originally Posted by Nathan k View Post
Thanks spartacus, what does the thermostat control? I will be investing in a external fuel/water separator. Drained the 3rd carb today. BHG marine were extremely helpful as usual, had it all done in 30 mins including testing engine. went out for a quick trip to the IOW and back and all seemed ok. Anyone up for a solent blast?
happy again are we?
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Old 11 February 2012, 10:27   #78
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happy again are we?
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Old 11 February 2012, 12:18   #79
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Sounds like the learning is ongoing ..with the changes in temp from day to night condensation in tanks can be a bugger.

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Old 11 February 2012, 12:27   #80
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Thanks spartacus, what does the thermostat control?
Outboard cooling. Just wondered if the thermostat was salted up which could cause problems with overheating and rough idling. Used to have a mint 1995 Yammie 6H4 40v and the thermostat needed annual checks. If you're investigating, watch as there is a gasket which will no doubt stick to the block or thermostat housing and tears on removal. Invest in one of these before taking a closer look. Glad you got it fixed.
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