de restricitng a 4 stroke mariner

stairliftoheaven

Petty Officer 2nd Class
Joined
Jun 8, 2004
Messages
113
good evening (its evening in london)<br /><br />I bought a 11' inflatable with a 13.5hp 4stroke mariner in spain a couple of years ago. The dealer told me that it was really a restricted 17hp but spanish law allows a maximum of 13.5hp due to local licencing laws. Now, i was reading the owners manual and it seems there are 3 models all different HPs but all have the same bore and stroke. When I serviced the engine the following season, I removed restrictor which sits between the carb and manifold; a 1/4" plate with a half moon shape in line with the venturi. The took it out on the water and the boat now jumps onto plane in a fraction of a second. The point of all this is that it now seems to be overrevving although I don't have a rev counter. After reading this gr8 forum, I reckon I need to find a higher pitched prop to keep the WOT revs down. Not sure about this though, any comments?? Also after removing the restrictor, do I need to change the jets in the carb as it may be runnign lea :confused: Any ideas on the subject much appreciated<br />thanks <br />chris
 

stairliftoheaven

Petty Officer 2nd Class
Joined
Jun 8, 2004
Messages
113
Re: de restricitng a 4 stroke mariner

oh yeah forgot to mention, have experienced what i think is prop ventilation as well since de restricting....
 

JB

Honorary Moderator Emeritus
Joined
Mar 25, 2001
Messages
45,907
Re: de restricitng a 4 stroke mariner

Moving to Mariner Troubles.
 

BillP

Captain
Joined
Aug 10, 2002
Messages
3,290
Re: de restricitng a 4 stroke mariner

That's great info but you may need to richen the mixture now to prevent lean running. Compare jet sizes with the larger version.
 
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