1960 BigTwin 40hp project

For pre 1975 outboards and race motors only.

Moderators: Alacrity, Rapier

Post Reply
User avatar
Rapier
Site Admin
Posts: 13892
Joined: Thu Feb 05, 2009 5:16 pm
CMBA Member: 569
Location: West Glos

1960 BigTwin 40hp project

Post by Rapier »

Having had one of these 7 years ago and sold it on, a cheap project came up recently. No spark, plenty of compression and a liklihood of it being a fresh water motor. Washed it off and cleaned it up - the usual ignition bits are needed and is indeed a corrosion free motor - with a crossthreaded plug. Head has come apart with a bit of heat - this model has compression relief valves.

Hope to find the bits to convert it to e-start. Everything else is available off the shelf.
Attachments
P1190348 (Large).JPG
P1190337 (Large).JPG
$_57.JPG
Fasten bra straps and remove dentures...

carl minshall
Posts: 81
Joined: Sun Feb 08, 2009 9:24 pm

Re: 1960 BigTwin 40hp project

Post by carl minshall »

Nice looking motor :thumbsup: , easy project?
Carl

User avatar
Rapier
Site Admin
Posts: 13892
Joined: Thu Feb 05, 2009 5:16 pm
CMBA Member: 569
Location: West Glos

Re: 1960 BigTwin 40hp project

Post by Rapier »

Styling not for everyone, but yes has been trouble free thus far - will be happier once the gearbox is off; I've seen some horrors in there.
Fasten bra straps and remove dentures...

User avatar
Rapier
Site Admin
Posts: 13892
Joined: Thu Feb 05, 2009 5:16 pm
CMBA Member: 569
Location: West Glos

Re: 1960 BigTwin 40hp project

Post by Rapier »

Normal wrestle with the gearbox to get it free.
Attachments
P1190362 (Large).JPG
Fasten bra straps and remove dentures...

User avatar
Rapier
Site Admin
Posts: 13892
Joined: Thu Feb 05, 2009 5:16 pm
CMBA Member: 569
Location: West Glos

Re: 1960 BigTwin 40hp project

Post by Rapier »

Normal for a project...waterpump screws seized and have to be coaxed out, but more often than not will break, even with heat. Gearbox has lost it's oil and emulsified what's left, probably due to a lack of sealing washers on the drain and fill screws on this motor - is not exclusively the cause, as the other seals can fail.
Attachments
P1190364 (Large).JPG
P1190367 (Large).JPG
Fasten bra straps and remove dentures...

User avatar
Rapier
Site Admin
Posts: 13892
Joined: Thu Feb 05, 2009 5:16 pm
CMBA Member: 569
Location: West Glos

Re: 1960 BigTwin 40hp project

Post by Rapier »

Parts on order. This is a copy of the December 1959 Data Bulletin - the 1959 BigTwin was 35hp.
Attachments
1960 40hp BigTwin 1 (Large).jpg
1960 40hp BigTwin 2 (Large).jpg
Fasten bra straps and remove dentures...

Post Reply