A thread about threads...

HughN · 21 April 2014, 20:14

I'm re-assembling a 1990 Yamaha-made, Mariner-badged 30 HP 2 stroke. The current job is putting the intake back on...

The manual says there are seven bolts of one size and two of another; the ones that came out were about three different sizes. Is there any way I can find out what length / spec these should have been?

(FWIW they're 33 and 35 below)
Cheers
Hugh

Nos4r2 · 21 April 2014, 20:18

Yes, PM me your email addy-I think I have the parts list for that motor.

whisper · 21 April 2014, 20:20

Or look your outboard up on Boats.net - New and Used Boats for Sale, Outboard Boat Motors, and Discount Outboard Boat Parts they will be something like M8 x 30

Nos4r2 · 21 April 2014, 20:28

I'm looking at a parts diagramme of what I think is your motor now and it shows 3 different bolt sizes. Is yours the clone of the C30 Yamaha?

I'm showing part numbers

97095-06025-00 (your #33)

97013-06035-00 (your #35)

and another size for the next one anticlockwise from your #35 which is part # 97313-06050-00

HughN · 21 April 2014, 20:36

Quote:

Originally Posted by Nos4r2

I'm looking at a parts diagramme of what I think is your motor now and it shows 3 different bolt sizes. Is yours the clone of the C30 Yamaha?

I'm showing part numbers

97095-06025-00 (your #33)

97013-06035-00 (your #35)

and another size for the next one anticlockwise from your #35 which is part # 97313-06050-00

Thanks Nos4r2, with a bit of Googling that should get me what I need.

Not sure about the C30 though - they both are model '689'.

Cheers
Hugh

Nos4r2 · 21 April 2014, 20:44

Unfortunately the PDF is slightly too big to post here-drop me an email addy and I'll send you it. It certainly looks like the same intake in the pictures.

I think the C30 is the dark grey 'Origin' Yamaha version of your motor.

HughN · 22 April 2014, 10:28

The other odd thing is the heads being different. Some of them have the original paint on them, others don't.

I think things have become a bit of a jumble / jigsaw puzzle!

RIB-Teccie · 22 April 2014, 12:46

My guess is the bolt stamped 8 is original, the lighter weight bolt stamped 9 is newer. The numbers are a reference to the torque setting you will find in the manual.

HughN · 28 April 2014, 15:11

Well, I cleaned it out with a plug tap and the screw tightened up to the recommended torque settings. Hylomar blue substituted for the gaskets (which are no longer available) and it now starts on the first turn of the key - without any puffs of fuel/air being blown out the sides as before.

Thanks for your help.

Daibheid · 30 April 2014, 16:00

Next time you take something like this apart it might be worth sketching the hole pattern on a bit of cardboard and sticking the bolts in the cardboard diagram as they come out. It saves a lot of grief especially if you're reassembling something months later. Another option is lay them out in their relative positions and photograph them with for example your cameraphone.