Yamaha 60CE overheating

[emmerson2]

I'm running a Yamaha 60ce on a 16' glass boat. it has a 11"1/8 x 13G prop. I have lifted the engine and to get max revs out of it but have found it over heats. I have dropped the engine down by 1.8cm.This has cured the over heating but I can only get 3000RPMs. If I put a finer prop on the engine will this bring the revs up? and what prop pitch should I be looking at?<br />When the engine was high it would rev to 5000 rpm.<br /><br />It cruised at 50km/h at 4000 Rpm.<br /><br />The boat is an old shape that starts with a decent "V" and then flatterns out at the stern. Very stable at anchor.<br /><br />

 

[Forktail]

Re: Yamaha 60CE overheating

Sounds like you're underpowered. I'm guessing that 16' glass boat is heavy and deep-V. What HP is the boat rated for? Are you able to trim the motor up while running?<br /><br />The overheating looks like it was caused by mounting the outboard too high and not getting enough water pressure to the intake.<br /><br />I think the smallest prop you can get for the C60 is going to be an 11 pitch. And since this outboard should be running at 4500 rpm minimum, I don't think you'll get there with the 11. Even with a serious cupped and raked, small diameter 4-blade, you're going to be way off.<br /><br />Can you get up on step? How fast does the boat go at the 3000 rpm?

 

[Solittle]

Re: Yamaha 60CE overheating

My gut tells me that you may have other problems. Seems to me that a 60 should be plenty for a 16' and I would think you should get a lot more than 3K out of the prop. I'm not comfortable in suggesting what to do next other than checking spark, fuel (including carbs.) & compression.

 

[ob]

Re: Yamaha 60CE overheating

10-4,60 ponies driving a 11 1/8 X 13 on a 16 ft glass boat should rap higher than 3000 if all is well.