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Old 04 August 2014, 14:54   #41
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your coil you say hasnt got any no's on if you take it off look at the reverse is should be on there as it seams that if it is on the tiller side of the engine they go on upside down the other side it is on show
hopefully ile be givving her a run down the river sometime this week nd report back
yep your right, I had already sussed that the coil had been reversed, good luck with the test run
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Old 05 August 2014, 14:51   #42
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just got back from the test run and she started first pull then ticked over sounding it was on 1 cylinder reved up and fired on both running perfect
tick over on one put in gear and slowly picked up revs untill the point where it fired on both and off she went pushed the boat 25knots puring lovely then throttle back a bit of a splutter and back to tick over and 1 cylinder

think the timing may be more out than i thaught
any thaughts ??
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Old 05 August 2014, 15:55   #43
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Remember I know nothing about two strokes once they get fitted to boats- but it does sound like poor HT spark to me. If it was a 70's Japanese bike I'd go for HT lead or spark plug cap. As revs increase the spark gets fatter and can jump poor connections. (I'm assuming old boat two strokes still had such things!)
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Old 05 August 2014, 16:02   #44
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On early single cylinder Yamaha bikes (as far as I remember!) you altered the points gap to advance/retard the ign timing but on yours you probably need to loosen and turn the whole plate (affecting both cylinders) making the fault less likely to be timing.

Make sure the points gap is to spec before checking the timing of course..
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Old 05 August 2014, 16:47   #45
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Spark plug NGK-B7HS, Spark plug gap 0.5 > 0.6mm or 20 > 25 thou.

If the plugs have not been changed it would be worth a try first.

I think that I posted a couple of pages on the way to set up the timing, but if you need them again or more info let me know.

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Old 05 August 2014, 17:09   #46
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On early single cylinder Yamaha bikes (as far as I remember!) you altered the points gap to advance/retard the ign timing but on yours you probably need to loosen and turn the whole plate (affecting both cylinders) making the fault less likely to be timing.

Make sure the points gap is to spec before checking the timing of course..
Thanks again for the gauge, top notch

The timing is set on no.1 cylinder (top 1), slacken off the timing plate, set the points gap to 0.35mm or 14 > 16 thou. once gapped rotate the flywheel untill the piston is 3.35mm or 0.132thou BTDC (you need a dial gauge) at that point the points should just be breaking contact, you get this bang on by rotating the base plate, you really need a meter, but the trusty 'fag paper' is just as good (IMO) when you are happy without moving anything tighten up the base plate, then all you have to do is set the points for no.2 cylinder (bottom) so rotate the flywheel untill no.2 cylinder is 3.35mm or 0.132thou BTDC at this point again the points should just be breaking contact if not you set these up by adjusting the points gap only, so it does not matter what the gap is just that it is breaking contact.

Now my head hurts, hope that makes sense
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Old 05 August 2014, 17:10   #47
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yep the plugs are new but i will try another set of new ones to eliminate them also change the ht lead and plug cap
and re check the points
other wise it runs spot on and sounds smooth just as long as i want to go full throttle
the only thing is the boat has a flat front so every wave you get drenched and taking the kids and misses down the river to plymouth next week for the annual fireworks competition in plymouth sound better not soak them on the way down
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Old 05 August 2014, 17:13   #48
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As far as I know the HT leads are moulded in and cannot be changed
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Old 05 August 2014, 17:55   #49
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some are on a thread others glued in ans some moulded like you say - never thaught of that
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Old 08 August 2014, 20:55   #50
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had 40 min fidling arround with bits and pieces today and re checked the points had to re adjust one also there seems to be alot of play in the stator linkage which i have adjusted a bit and she sounds to be running as she should now off to do round 2 of sea trials tomorrow have a few other minor adjustments to do on the water hopefully off we go
ile report back on return
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