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Old 15 July 2014, 02:47   #21
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I would not cut it down, it will murder it's resale value, just sell it and get an Aerotec or other SIB that will not have these issues.

The Honwave transom is plywood like all SIB's, with a sheathing of plastic or similar.
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Old 15 July 2014, 02:59   #22
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Originally Posted by beerbelly View Post
the honwave transom is fibreglass not plywood not sure if cutting it is a sensible option.i think this is a designe flaw in the 3.8 drop down to a 3.2 they apparently don't suffer this problem
They do im afraid, not as much as the 3.8, but there is still a pronounced hump in the floor with max engine and heavily loaded.
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Old 15 July 2014, 04:44   #23
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I had this problem with my 3.8 too. Parsun 9.8 4 stroke short shaft, cavitation when coming onto the plane. Now sorted having remembered to change trim setting to 2nd hole from 3rd!! (My 14' portabote needed this setting) and topping up deck pressure after sitting in water for 10 min or so. she now gets on the plane quickly with +/- 300kg (2 + fuel + gear) and balanced out. could not believe how quick she was with the Parsun either, I was thinking of getting a heavier 15 next year but will now stick with this as it's quick enough and very economical/reliable. Plus I have a Smartwave XL 490 centre console on order for longer trips out and fun with more on board.
Here is my rig in the water at Ferryden Montrose waiting on my mate with the last of the gear.
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Old 15 July 2014, 07:26   #24
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Originally Posted by warder54 View Post
I had this problem with my 3.8 too. Parsun 9.8 4 stroke short shaft, cavitation when coming onto the plane. Now sorted having remembered to change trim setting to 2nd hole from 3rd!! (My 14' portabote needed this setting) and topping up deck pressure after sitting in water for 10 min or so. she now gets on the plane quickly with +/- 300kg (2 + fuel + gear) and balanced out. could not believe how quick she was with the Parsun either, I was thinking of getting a heavier 15 next year but will now stick with this as it's quick enough and very economical/reliable. Plus I have a Smartwave XL 490 centre console on order for longer trips out and fun with more on board.
Here is my rig in the water at Ferryden Montrose waiting on my mate with the last of the gear.
That's *remarkable* performance from a heavy low powered engine on a very heavily loaded large SIB. Would have thought if you add a console and even *more* load you'll be like a slug in treacle.

Does not seem representative of most of us on here......

In comparison my airfloor Zodiac (30kg boat) with a 9.8 Tohatsu (26 kg engine) was fine with me + child and light load (total load about 125kg) but add wife and other child (so total about 200kg) and major weight shift was needed to get on the plane.

My Bombard with Mariner 15 (lightest 2 stroke 15 available) pops up very quickly on the plane with the 125 kg load, not tried it with more weight yet.

Just amazed at what is reported on here from some SIB owners.
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Old 15 July 2014, 08:45   #25
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A bit of thread drift.

Just been for a look round the Parsun website, given the above performance I was thinking of ordering a 9.8 so my son can mono ski off the Futura

Anyway, came across this via Bill Higham, looks familiar doesnt it?

Buy Parsun parsun 9.8hp 2 stroke short shaft 9.8HP Outboard at Bill Higham Marine
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Old 15 July 2014, 09:55   #26
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Clarification

Ok, just had a recalc on weight, my guestimate of 300kg was way over the top! probably nearer 210kg. as for speed - not measured but much quicker than I was expecting from this set up but fast enough for my needs. Certainly skimmed over the surface nicely and sounded like it was near max revs at WOT (never managed this on the Portabote)
Had my mate near back to start then shift forward as we moved away - worked well.
Hope that is clearer for all.
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Old 15 July 2014, 09:57   #27
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Originally Posted by warder54 View Post
I had this problem with my 3.8 too. Parsun 9.8 4 stroke short shaft, cavitation when coming onto the plane. Now sorted having remembered to change trim setting to 2nd hole from 3rd!! (My 14' portabote needed this setting) and topping up deck pressure after sitting in water for 10 min or so. she now gets on the plane quickly with +/- 300kg (2 + fuel + gear) and balanced out. could not believe how quick she was with the Parsun either, I was thinking of getting a heavier 15 next year but will now stick with this as it's quick enough and very economical/reliable. Plus I have a Smartwave XL 490 centre console on order for longer trips out and fun with more on board.
Here is my rig in the water at Ferryden Montrose waiting on my mate with the last of the gear.
Thank, good to know its not just me. I've been running it on the second hole as that's where it seemed to be most vertical when level. maybe its more about the inflation but it definitely feels like the prop should be deeper as Locozodiac mentioned. Nice looking rig btw!
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Old 15 July 2014, 10:03   #28
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Cheers Sailpower, got her new in March as a 60th birthday treat to myself. Paid 1011 including delivery. Sold the Portabote (I loved it - wife hated it -"not getting me in an origami boat!")
Kept the Parsun from that set up and I'm now happy with the current combo. May however think about a 15 next year - never totally satisfied!!!
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Old 15 July 2014, 10:36   #29
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Just looking at the weights of these Parsun engines (don't know how they compare to other modern motors) but they seem nice and light - the 4 stroke 9.8 is around the same as the old Johnson 9.9/15 2 stroke that I'm using - the 2 stroke Parsun even lighter.

The old Johnson suits my level of mechanical understanding of 2 strokes - no ignition timing to fuss with or valves/belt drives but the 4 strokes are undeniably cleaner and qieter.
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Old 15 July 2014, 12:15   #30
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I have the same problem with cavitation / ventilation on a sunsport 3.2m sib and 9.8 tohatsu 2st , I have cut 30mm out of the transom it helped when I am fishing on my own it runs like a dream but as soon as I add another person It starts to cavitate, I have tried shimming the outboard back up but with no luck, I was chatting to a guy fishing of llandullas last week and he recons I need an ali / wood floor and my problems will be solved, I am looking out for one and will report back with the results
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