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Old 07 June 2010, 16:13   #11
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Its a 4.6m Selva.
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Old 07 June 2010, 17:49   #12
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Is it kept in the water?
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Old 08 June 2010, 02:16   #13
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No I have the fun of launching and recovering.......
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Old 08 June 2010, 02:55   #14
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No I have the fun of launching and recovering.......
Ok, so it's not weed buildup.


In which case you need to
1) find the pitch of your original prop.
2) Make sure your engine is running right.
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Old 08 June 2010, 06:56   #15
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Tried an 11 3/4 x 17 pitch prop today, only got 3200 rpm. Will have to keep trying.....
so your original prop could be a 13" then?
in which case you need to be trying an 11" and a 9"
have you done a compression test, stripped and cleaned the carbs, and checked the timing advance at WOT yet?
If not then It might be an idea! and is your tacho correct?
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Old 08 June 2010, 07:12   #16
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so your original prop could be a 13" then?
That's what's confusing me. I thought that too, but the revs are very low for a 13" prop.Makes me think the engine isn't right somehow, or the revcounter is set up wrong.
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in which case you need to be trying an 11" and a 9"
have you done a compression test, stripped and cleaned the carbs, and checked the timing advance at WOT yet?
If not then It might be an idea! and is your tacho correct?

What speed is it doing at WOT with the original prop?
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Old 08 June 2010, 10:37   #17
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Hi,
I have looked at carbs, they seem ok. I will do a compression test when I can borrow the tool.
With the original prop at 4000 rpm the speedo shows about 28 mph, not sure how accurate this is.
As for the tacho I would not have a clue if its set up right.
I have spoken to a local outboard service man, who thinks its probably prop related as being a 2 cylinder engine it wouldn't reach 4000 rpm if there was anything major wrong.
Thanks for all the advice, I will keep trying....
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Old 08 June 2010, 12:59   #18
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I have spoken to a local outboard service man, who thinks its probably prop related as being a 2 cylinder engine it wouldn't reach 4000 rpm if there was anything major wrong.
He's probably right if it's a twin. I had it in my head it was a triple for some reason.
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Old 08 June 2010, 14:43   #19
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I am now trying to find an 11", or 9" prop.
Props for a Johnson should fit.
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