Tuesday, 22 October 2013

Parsun on my Gen IV.

Last weekend I went out again for a run with the 10' Gen IV Porta-Bote and the Parsun 5.8hp 2 stroke.

Again I was impressed with the difference the 5.8 hp made over the 4 hp mariner.
However I am beginning to see a new issue.
I believe it is to do with cavitation and next weekend I hope to do some more tests to see if I can overcome the problem.

The best performance I was able to obtain was by having the outboard set in the 4th hole on the motor.
When I tried it in the third hole, my bote didn't seem to go as well.
I still think it's an issue with the flexing transom on my Porta Bote.

What is happening is every now and then, the motor would rev high and the bote would slow down.
I believe that this is due to the propeller hitting an air pocket cause by cavitation when travelling against  a strong current..
Once the bote slowed, it would grab water and push me forward again.
Next weekend, I want to try different settings to see if I can overcome the problem.
I'll keep you posted.

Has anyone else experience this phenomenon with their boat?

I'd like to add that the issues I am facing is not the fault of the Parsun outboard but rather the flexibility of the Portabote.

I am very impressed with my Parsun Outboard.

I'd love to hear of your experiences


  1. I also had a cavitation problem with my 12 footer with 5.8 Parsun. Make sure the centre strut on the rear seat is in place and centred, if it's not it will cavitate like crazy, I also made a cavitation plate out of some sheet stainless and that cured the problem completely.

  2. P.S. My name is Ian and I'm a technological incompetent. This was the only way I could figure out to post this.