What compression on 2 stroke 3hp?

[willk]

So, I took her to Sea today. Not too far, just a 1/4 tank at WOT to see how she fared. She fared well. Turned out the trim pin was stuck, so I had to be content with fully in but hey! To those who say the shear pin is trigger happy - I say I hit a line doing a full 4mph and she shrugged it off - maybe I have a drill bit shaft in there

Max recorded was 7 mph at what I can only describe as planing - only in slo-mo

[willk]

Initial thoughts: I've not previously used an engine like this - except when I hadda hop into a stray SIB that blew onto a beach one day - but hey, that's a different story! It's a Tohatsu like the 9.8 and there the similarity ends...

Good points

• It weighs 13kg - so a one finger lift
• Integral tank - no tank or hose or primer to stow on the RIB or clutter the SIB
• It has Neutral and Forward
• Flip to Reverse creates a whole new Thing for me to Explore

Not so Good Points

• Kinda flimsy. I know it's sound, but it feels flimsy.
• No Reverse gear - but I don't think that will be an issue once I get the head around it. In some ways, reverse on a SIB is like an ashtray on a motorbike. Maybe it's a Good Point!
• Integral Tank - looking kinda low after a few minutes feckin' about at WOT and scaring swimming dogs
• No throttle control on the tiller.
• No shallow water setting - I think?
• Flimsy tiller doesn't fit my tiller extension. Mods to follow.

My overall impression is that the 3.5hp is exactly what I need for my future adventures - but it's an egg-whisk. The 9.8hp is a "real" engine - writ small. Anyway - the 3.5hp is going to do what I need on the SIB - my adventure SIBing days may be over - the big decision awaits. Thing is, I always wanted to take her up the Foyle from Moville to Strabane - and I need the 9.8hp for that

[willk]

Originally Posted by C-NUMB

I had the same issue, the prop sheerpins went without hitting anything. The original ones, slightly brass like colors did not last. Then got another type, looks like SS, then the problem went a way. But still good to have spare ones onboard.

While servicing the engine I pulled off the prop to check the pin. It was the silvery variety and bent. There was a fair bit of gouging caused to the plastic slot in the prop and this made the prop difficult to remove. I've built up the slot with plastic metal and replaced the pin - I'll likely buy a new prop at this point but I wonder what the story with the bent shear pin is? Not much point fitting a shear pin that won't shear - may as well use Mollers' drill bit!

[willk]

Originally Posted by willk

The 9.8hp is a "real" engine - writ small. Anyway - the 3.5hp is going to do what I need on the SIB - my adventure SIBing days may be over - the big decision awaits.

9.8 owners will be interested to know that I put her on DoneDeal. My phone rang ten minutes later and she sold next day for the asking price less a Luck's Penny. I wasn't too greedy on the price which will have helped and she's gone to a nice new home on a freshwater loch.

[uncle al]

wilk someone has to ask, what is a lucks penny?

[jambo]

You give the buyer some money for luck. An old Celtic custom👍


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[uncle al]

Thanks jambo I have never heard that one before.I hope you are all well

[jambo]

Originally Posted by uncle al

Thanks jambo I have never heard that one before.I hope you are all well

Yes Al all fine as I hope you are?
Cheers
B


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