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Old 12-26-2011
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Johnson 4hp question

Hi all, does anyone on here know if the Johnson 4hp twin from 1981 has an external fuel tank hookup? or just an internal?

And also how do you sailors think it would perfrom on a 8' Phil Bolger designed dinghy... I dont expect warp speed

Thank you, and Merry Christmas/happy new year to all

Adam
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Old 12-26-2011
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4hp will haul the mail on an 8 footer. I modified an internal tank motor to use an external tank. Works fine.
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Old 12-27-2011
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Quote:
Originally Posted by AdamHowie View Post
Hi all, does anyone on here know if the Johnson 4hp twin from 1981 has an external fuel tank hookup? or just an internal?

And also how do you sailors think it would perfrom on a 8' Phil Bolger designed dinghy... I dont expect warp speed

Thank you, and Merry Christmas/happy new year to all

Adam
I have a Johnson and an Evinrude 4 Twin. Both are the same - different skin!

There should be a point at the front of the motor to take an external fuel tank. I run ours' on the external tank, and keep the internal as a reserve.

This drawing shows the arrangement

We have a 2.60mtr Lodestar inflatable, that with one onboard, will get up on the plane with the 4hp Twin.

Wishing you all to have a prosperous and Happy New Year.
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Old 12-27-2011
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Quote:
Originally Posted by PhilipStevens View Post
There should be a point at the front of the motor to take an external fuel tank. I run ours' on the external tank, and keep the internal as a reserve.
Thank you for the reply, Is there a switch that changes it to run off the external to internal tank and vice versa?

Oh and one other thing, does yours have neutral or is it a direct drive?

Adam
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Old 12-27-2011
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Quote:
Originally Posted by AdamHowie View Post
Thank you for the reply, Is there a switch that changes it to run off the external to internal tank and vice versa?

Oh and one other thing, does yours have neutral or is it a direct drive?

Adam
Gears are neutral and forward via the side gear lever on both engines - the older Johnson is in better condition than the 2year younger Evinrude.

The fuel on/off valve/switch, is also the "choke" when pulled out, and is set to "off" to use fuel from the external fuel tank, and to "on" to use its built-in tank.

I think the Johnson/Evinrude 4Twin is/was one of the best little 2stroke engines made, with maybe the Yamaha Malta 3hp - that I traded-in for one of the 4Twin's.


For info, another good outboard website - http://www.marineengine.com/manuals/johnson/

I'm in the UK, and the two best reference websites are in the USA!!
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Philip.

Last edited by PhilipStevens; 12-27-2011 at 11:35 AM. Reason: url added
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