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Old 18 March 2015, 16:25   #11
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Ok, be interesting to see how it goes with the new prop. 180 is a bit steep! I reckon just try it as it is, it should go pretty well
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Old 18 March 2015, 18:14   #12
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Ok, be interesting to see how it goes with the new prop. 180 is a bit steep! I reckon just try it as it is, it should go pretty well
Thanks for your advice.
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Old 18 March 2015, 20:08   #13
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I will reopen the thread after some tests and post my results for anyone interested.
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Old 19 March 2015, 12:19   #14
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I'm interested to see how it goes now!
is 20hp the most you can stick on the back? Is the 2cyl 20hp the same block as the 25/30 or is it the 15/20 block?
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Old 19 March 2015, 17:08   #15
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Hi Roflhat

Yeh it's the base model for the 30hp I'm not sure if it will go to that with just a carb,may be a exhaust would need changing to.I have been pondering on the ideal for a while.,Will it go to a 30hp what do think needs to be changed for the 30hp tune up.If peek revs are stated at 5,500 and the 25hp revs to 6,000 does that mean the 30hp revs 6,500 or is that where the exhaust comes in, Unsure!
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Old 20 March 2015, 01:50   #16
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I asked about this prop not so long ago with no real advice from this fourm. Thanx guys" Any way I ended up getting a Solas saturn and picked up a heap of pop out of the hole and gained 6kph up top....massive results for a lil 25hp motor. Good luck with the ballistic I kinda wish I had leaned that way but I'm happy as with me results for now
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Old 20 March 2015, 05:29   #17
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Hi Roflhat

Yeh it's the base model for the 30hp I'm not sure if it will go to that with just a carb,may be a exhaust would need changing to.I have been pondering on the ideal for a while.,Will it go to a 30hp what do think needs to be changed for the 30hp tune up.If peek revs are stated at 5,500 and the 25hp revs to 6,000 does that mean the 30hp revs 6,500 or is that where the exhaust comes in, Unsure!
Might be worth your while tuning it up, if it's only a couple quid. What year motor is it?
I'm not sure exactly what the differences are, you can check fairly easily with a parts manual, have a look at the timing settings of each engine as well, that usually changes as the power increases. You could check the part no. of the exhausts of the 20/30 to see if they're the same. The carbs might be the same as well, maybe different jets? I'm sure theres guys on here who know more about these motors, they're fairly common
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Old 20 March 2015, 06:42   #18
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I asked about this prop not so long ago with no real advice from this fourm. Thanx guys" Any way I ended up getting a Solas saturn and picked up a heap of pop out of the hole and gained 6kph up top....massive results for a lil 25hp motor. Good luck with the ballistic I kinda wish I had leaned that way but I'm happy as with me results for now
Hi Rusty

If you don't mind me asking what's your top speed now.
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Old 20 March 2015, 06:58   #19
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Might be worth your while tuning it up, if it's only a couple quid. What year motor is it?
I'm not sure exactly what the differences are, you can check fairly easily with a parts manual, have a look at the timing settings of each engine as well, that usually changes as the power increases. You could check the part no. of the exhausts of the 20/30 to see if they're the same. The carbs might be the same as well, maybe different jets? I'm sure theres guys on here who know more about these motors, they're fairly common
Hi Roflhat

The serial number is 953 which I believe to be 1988 its cc is 423, this is where it becomes a bit of a grey area as not sure when the hp ratings changed from power head to being taken from the prop.

Do you happen to know the site for checking in a parts manual.Also it's a merc mariner Belgium made.Would that be under the merc parts or mariner.
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Old 20 March 2015, 08:27   #20
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I'm really not too sure. I have some experience with those engines but we had 3 of them and just mixed and matched parts. Some parts lists here - 1988 Mariner Outboard Parts

Not sure if it's jetting, a restrictor plate or a different carb altogether. This guy reckons just get the carb off a 25hp - Mercury 20 hp conversion to 25 hp Can it be done
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