My thundercat

[jeffstevens763@g]

That looks a mean boat mate love the ranger too

[Roflhat]

Got out for a blast last night, weather was really nice, not warm though!
Engine is up at 70mm and revving a bit higher but roughly the same speed, 57.5 knots with myself and my girlfriend in it.
Went into a cave with it -


At the beach


hopefully a video attached from Sunday as well

[fel2]

Black is killer

[fel2]

[attach]

Can't wait to try mine !!

[fel2]

Do your think your boat is more stable with the bigger engine on the back ? At what point it does make a difference ?

[jwalker]

Bloody 'ell...well done! I hope you never get too much air under it!!

[jwalker]

Oh aye, where about is that pontoon, Valtos Uig I guess but where abouts and is there public access? Ta.

[Roflhat]

Originally Posted by fel2

Can't wait to try mine !!

Do your think your boat is more stable with the bigger engine on the back ? At what point it does make a difference ?

Love the red, looks really cool!
The boat feels more stable with the 70hp, maybe because I don't have to run as much trim to get the speed from it. Feels like I could cruise all day at 50 knots, whereas 50 knots with the tohatsu felt like you were driving on the limit

Originally Posted by jwalker

Bloody 'ell...well done! I hope you never get too much air under it!!

Thanks, so do I! so far so good but I'm still taking it easy while I get more used to the setup.

Originally Posted by jwalker

Oh aye, where about is that pontoon, Valtos Uig I guess but where abouts and is there public access? Ta.

It's in Miavaig, Uig. Just before Valtos:


There's a slipway you can use just across the bay to launch, and tying up at the pontoon is no problem.

[jwalker]

Ok, thanks. Is there drinking water available about there and is it in order to stay a night against the pontoon?

[Roflhat]

There's power outlets and fresh water hoses on the pontoon, staying overnight shouldn't be a problem, you may have to tie alongside another boat

[jwalker]

Okidokey, thanks for that Seumas.

[fel2]

Yamaha 70hp 1987
Need 1 piston/ring

600$.

Beside the middle casing and the lower unit is there something else needed to make it shortshaft ?

[fel2]

http://hpbc.ca/viewtopic.php?f=19&t=3575&start=0

Here good info on the swap !!!!

[fel2]

I did find a 70HP with 1 blown piston. Other are 120 lbs.

600$

[fel2]

70CES stands for Competition Electric Short....There is another model called 60C which the C stands for Commercial ...then there are the Enduro models which are a little different again.
I have not found any yamaha short shaft model 30 to 70 hp where the short shaft is an exact 15 inch like the Mercury or OMC. Some like the 30 yamaha are well over 16 inch. The 70CES is a little longer as well. A long shaft 70 hp yamaha with the big foot is approximately 20.5 to 21 inch. By switching to the smaller 55 hp foot the length is a little over 19 inch.
The confusing part is all the models of the same horsepower. Different part numbers for what could or could not be the same parts. The last 2 digits for parts such as mid or gear case is the colour of the paint,

[Roflhat]

I've spoken to Hounddog before, he has a wealth of knowledge on these engines!

I think the parts you need to put together a short shaft 70 (non CES) are:
50hp transom bracket (or 55/60 short)
cut and welded 70hp mid section (or 55/60 short mid)
60d or 70ces gearbox (if you want the 1.71 ratio, for 1.84 there are more options)
a good powerhead

then the 60hp enduro and pull start if you want that, if not standard 70hp cowl will fit

If you do build one, it's just as easy to put a 90hp powerhead on the 60hp mid as it is to put a 70hp

So basically if you're putting one together from scratch it's definitely best to start with one of the old 55/60 2 cyl short shafts, that will give you most of the bits you need bar the powerhead. Although if you do find a 55/60 short then it would make a good motor as is for a surfcat

[fel2]

If part was avaible more easily around me
I think it would be doable.

[fel2]

[Roflhat]

I like that a lot! looks even better than I expected, the red is excellent

[Roflhat]

Was down at Easdale over the weekend at the Rib Rendezvous, had a really great time. Had an issue with the pull start before the event started, managed to get it fixed just in time on Saturday morning and caught up with the rest of the RIBs, over 30 the first day!
Covered over 90 nautical miles on the first day, plenty of chop so gave the boat a good run. Also some nice calm sections to go flat out, used around 80 lt of fuel - thirsty!






The thundercat was a very wet ride but a lot of fun!