sr4 outboard change

adrian c · 02 March 2010, 18:51

Hi all

We are in the process of changing engines on my son’s sr4 and would appreciate some advice on fitting, it still has the original four seat back to back layout which is ok for the moment .We are fitting a mercury 35 hp with power trim / tilt and as the footprint of the mounting bracket is larger we will need to replace the ply board on the transom, so is it best to fit the engine central or do we have to offset it and if so by how much ?

Thanks

chewy · 02 March 2010, 19:00

Where was the original mounted? I know on the SR5.4's they offset the engines.

Both engines I've had have been mounted in the centre on ym SR4.

Downhilldai · 02 March 2010, 19:26

What motor's on there now?

chewy · 02 March 2010, 19:28

You need at least a 50hp on an SR4.

Downhilldai · 02 March 2010, 19:30

Quote:

Originally Posted by chewy

You need at least a 50hp on an SR4.

50hp, being the max rating for an SR4.

chewy · 02 March 2010, 19:41

Quote:

Originally Posted by Downhilldai

50hp, being the max rating for an SR4.

I'm working my way down to that, started with a 60hp and now down to 55hp!

adrian c · 02 March 2010, 20:36

The old engine was a Yamaha 50 (white band on cowling) which does seem to have been fitted off centre to the right. The main reason for changing is the 50 is too heavy for my son (13) to lift, the trim/tilt on the mercury will allow him to be far more adventuress with beaching etc. Iam sure the 35 will have enough power as I want him to have fun without going to mad and with the 50 anything over ¾ throttle made the boat chine hop

Downhilldai · 02 March 2010, 20:45

Do you need to re-drill the transom for the mounting bolts for the Merc 35? If not, then I'd be inclined to use the same holes.

What age is the Merc?

Nos4r2 · 02 March 2010, 20:53

Where did you find a 35hp mercury with PTT? I didn't know they even made one.

adrian c · 02 March 2010, 20:56

new holes will have to be drilled as bracket is larger due to the trim /tilt motors and it is an 87 model but in very good condition

Downhilldai · 02 March 2010, 21:01

Quote:

Originally Posted by Nos4r2

Where did you find a 35hp mercury with PTT? I didn't know they even made one.

PTT was optional on the 2-cylinder '89 & '90 models, according to the old brochures in my 'library'

Downhilldai · 02 March 2010, 21:02

Quote:

Originally Posted by adrian c

it is an 87 model but in very good condition

Brown Band?

Mollers · 02 March 2010, 21:22

Quote:

Originally Posted by Downhilldai

Brown Band?

In the under crackers owing to severe chine walking?

Downhilldai · 02 March 2010, 21:29

Quote:

Originally Posted by Mollers

In the under crackers owing to severe chine walking?

Hope you're not letting a bit of a wobble put you off joining 'the club'?

Nos4r2 · 02 March 2010, 21:31

Quote:

Originally Posted by Downhilldai

Hope you're not letting a bit of a wobble put you off joining 'the club'?

I'm being quiet on this thread as anything I say about SR4s is likely to be incompatible with a parent's view on what a 13yr old should be doing...

Mollers · 02 March 2010, 21:38

Quote:

Originally Posted by Downhilldai

Hope you're not letting a bit of a wobble put you off joining 'the club'?

I get it, a belly is required by SR owners to aid stability. That explains why Gibbo's SR was leaping about all over the place off of the IOW. Get some weight on you son!

I've just lost 10lbs, best get that back.

adrian c · 02 March 2010, 21:39

i may be wrong on the year i was told 87 and it has a red band if that helps will post pics tomorrow

adrian c · 02 March 2010, 21:48

Originally Posted by Nos4r2
Where did you find a 35hp mercury with PTT? I didn't know they even made one.

wightbay iow, can anyone tell me which workshop manual covers this engine please

Downhilldai · 02 March 2010, 21:54

Quote:

Originally Posted by Mollers

I get it, a belly is required by SR owners to aid stability. That explains why Gibbo's SR was leaping about all over the place off of the IOW. Get some weight on you son!

I've just lost 10lbs, best get that back.

And some, you skinny git!

Quote:

Originally Posted by adrian c

i may be wrong on the year i was told 87 and it has a red band if that helps will post pics tomorrow

Merc changed from brown band to a red & silver band around '87. It sounds like one of the early versions of this colour scheme.

chewy · 02 March 2010, 21:54

Quote:

Originally Posted by Mollers

I get it, a belly is required by SR owners to aid stability. That explains why Gibbo's SR was leaping about all over the place off of the IOW. Get some weight on you son!

I've just lost 10lbs, best get that back.

Nope, with 16 stone of prime Yorkshire beef and a knackered 2 stroke clamshell hanging off the back mine went vertical, granted the engine promptly died but for 5 seconds all you could see was sky!