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Old 09 October 2014, 04:19   #21
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Originally Posted by Landlockedpirate View Post
Nope, Mariner 15 and 20 are different blocks and engines. The 15hp is common with the 9.9 andthe 20 is common with the 25 and at some ages the 30hp.
Hi all

I did have a 15c mariner which could have been converted to an 18hp possibly a 20hp but not 100%.Worth checking with a Mariner mechanic,this was a carb change.
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Old 09 October 2014, 04:37   #22
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Country: UK - England
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[QUOTE=MrHeadsocket;649588]Ok guys, cheers for all the replies! I will walk away from this one, and cancel it through eBay... I currently have a Mariner 15HP that needs a rebuild and I will most likely get it rebuilt, but if I got it completely rebuilt with 20HP parts (including carbs etc) will this uprate the engine to 20HP and will this cause any damage?[/QUOTE

Hi all


I did have a yam mariner which was a 15c, when I took it for a service and asked could it be uprated I was told it would be possible to gain a bit more hp by changing the carb.These engines were a favourite for Junior racing ,didnt ask exactly what hp would be gained but you can get some mariner 18hp worth checking with your engineer see what can be changed if anything.
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