Tohatsu 6HP 4 stroke propeller comparison - SailNet Community
 
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post #1 of 9 Old 05-29-2012 Thread Starter
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Tohatsu 6HP 4 stroke propeller comparison

New 6HP 4 stroke Tohatsu outboard at 6,000' elevation nets about 4.8 HP from what I have read. Boat is a 12' long 5' wide Jon boat, kind of shaped like a brick,
total loaded weight of about 700 pounds. Stock prop was 7.8 " diameter
X 8" pitch. To lower trolling speed changed to a 7.9" diameter X 6" pitch which worked well. Top speed with the 8" pitch was 10.1 mph. Top speed with the 6"
pitch was 10.5 mph. Sounded like it was reving a little more with the 6" pitch but did not get into the rev limiter. Although our boat does get up on a plane it appears the 6" pitch does provide more thrust as the top speed increased. If put on a displacement hull it appears the 6" pitch prop would provide more thrust, I think.

Page 50 shows the propeller options:

http://www.tohatsu.com/tech_info/own...03-11059-6.pdf

Paul T
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post #2 of 9 Old 06-03-2012
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Re: Tohatsu 6HP 4 stroke propeller comparison

You need to put in the high altitude jets

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post #3 of 9 Old 06-03-2012 Thread Starter
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Re: Tohatsu 6HP 4 stroke propeller comparison

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You need to put in the high altitude jets
Fairly often we go to a lake that is close to sea level and I have some concerns about it running too lean? It runs perfectly at 6,000 feet with no indication of it stumbling or being too rich. The little bit of gain in top end power isn't worth having to change the jets back and forth. However, that being said if you think it is harmful for it to be a little on the rich side at 6,000 feet I would be interested to know more. Thanks for your input.

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post #4 of 9 Old 06-03-2012
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Re: Tohatsu 6HP 4 stroke propeller comparison

The engine is effectively drowning in fuel at 6000. It will not hurt anything, but the plugs are going to foul out and you have a 10% power loss.

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post #5 of 9 Old 06-04-2012 Thread Starter
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Re: Tohatsu 6HP 4 stroke propeller comparison

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The engine is effectively drowning in fuel at 6000. It will not hurt anything, but the plugs are going to foul out and you have a 10% power loss.
OK, so noted. Typical day for us is 2 to 3 hours of trolling then a flat out 10 to 15 minute run back to the ramp. We have about 6 trips on it so far with no problems. I will check the plug and if it looks like it came out of a 2 stroke I will get the high altitude jets. As long as it is not washing the oil out of the cylinder, it should be OK? It runs perfectly as is. Many thanks for the feedback.

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post #6 of 9 Old 06-04-2012
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Re: Tohatsu 6HP 4 stroke propeller comparison

Not a huge deal at 6K. At 7500 it's an issue that would need to taken care of

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Re: Tohatsu 6HP 4 stroke propeller comparison

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Not a huge deal at 6K. At 7500 it's an issue that would need to taken care of
Lake Tahoe, at about 6,200 feet is the highest we go to, so far, so good but will keep an eye on the plug. Thanks again for your input. Great motor, by the way.

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Re: Tohatsu 6HP 4 stroke propeller comparison

On behalf of the ex-Honda engineer who designed it 14 years ago...Thank you

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post #9 of 9 Old 06-08-2012 Thread Starter
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Re: Tohatsu 6HP 4 stroke propeller comparison

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On behalf of the ex-Honda engineer who designed it 14 years ago...Thank you
I have had Honda cars, motorcycles, snow blowers, generators, and outboard motors for years. In my opinion they are perfect. I was going to buy the Honda 5HP but for the same weight I got the Tohatsu 6HP instead. The Tohatsu works perfectly also.

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