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Will a 750 5speed engine fit a 72 frame? #126427
10/16/07 7:44 pm
10/16/07 7:44 pm
Joined: Jul 2007
Posts: 45
Oklahoma City OK
Jake Hartley Offline OP
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Jake Hartley  Offline OP
BritBike Forum member
Joined: Jul 2007
Posts: 45
Oklahoma City OK
Was offered a good deal on a good engine. I need to know if the 73 5 speed engine will fit into my early 72 frame without much drama.

Sorry if this is a goofy question, but my last Brit bikes were Nortons......


"He who makes a beast of himself gets rid of the pain of being a man"
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Re: Will a 750 5speed engine fit a 72 frame? #126428
10/16/07 8:17 pm
10/16/07 8:17 pm
Joined: Aug 2007
Posts: 34
UK
Norman Rowbottom Offline
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Norman Rowbottom  Offline
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Joined: Aug 2007
Posts: 34
UK
Hi Jake, ( have 1971 T120 OIF with a 1976 T140v motor, has you can see from the pic it looks more like a 1979 T140D special but it is not of course, so I don't think you should have any problems with your setup.
I presume your frame is an oil in the frame type.





No doubt the more knowledgeable will correct me if I am wrong.

Good luck norman.


IfYaWannaBeAWinnaYaGottaeatYaDinnaMamSaid
Re: Will a 750 5speed engine fit a 72 frame? #126429
10/16/07 8:38 pm
10/16/07 8:38 pm
Joined: Mar 2006
Posts: 3,692
gastonia nc
R
raf940 Offline
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raf940  Offline
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R
Joined: Mar 2006
Posts: 3,692
gastonia nc
this is kind of bassackwards but my bike is a 73 T140 frame and 72 T120 engine so i dont see why not


1972 Triumph T120
1968 BSA A65
1968 MGB Roadster
1979 Chevrolet Camaro Berlinetta
1969 Honda Mini Trail
1939 farmall f30 tractor
2004 Honda Shadow Aero
1972 BSA Thunderbolt
1975 yamaha xs650b
1972 Norton commando project
Re: Will a 750 5speed engine fit a 72 frame? #126430
10/17/07 3:15 am
10/17/07 3:15 am
Joined: Aug 2001
Posts: 6,891
Vermont
Jon W. Whitley Online content

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Jon W. Whitley  Online Content

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Joined: Aug 2001
Posts: 6,891
Vermont
Jake,

The 1973 engine will fit into the 1972 frame......as if it was made to do so. The dimensions are the same. You may have to use spacers for your top end motormount ( to bring the bracket up to a level height )...but that's about it.

beerchug


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project

Re: Will a 750 5speed engine fit a 72 frame? #126431
10/17/07 4:30 am
10/17/07 4:30 am
Joined: Jul 2007
Posts: 45
Oklahoma City OK
Jake Hartley Offline OP
BritBike Forum member
Jake Hartley  Offline OP
BritBike Forum member
Joined: Jul 2007
Posts: 45
Oklahoma City OK
Thanks all!


"He who makes a beast of himself gets rid of the pain of being a man"
Re: Will a 750 5speed engine fit a 72 frame? #126432
10/17/07 4:35 am
10/17/07 4:35 am
Joined: Oct 2007
Posts: 93
uniontown, pa, usa
Buster Conrod Offline
BritBike Forum
Buster Conrod  Offline
BritBike Forum
Joined: Oct 2007
Posts: 93
uniontown, pa, usa
Hmmmmm....could there be an issue of the shifter and brake being on the same side? When did they change.


1970 TR6R Dry Frame Silver and Blue, Prettiest bike ever....
Re: Will a 750 5speed engine fit a 72 frame? #126433
10/17/07 7:46 am
10/17/07 7:46 am
Joined: Aug 2001
Posts: 151
Canby, Oregon
B
Bret Edwards Offline
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Bret Edwards  Offline
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B
Joined: Aug 2001
Posts: 151
Canby, Oregon
Buster,
'73 still had the shifter on the right and brake on the left. This makes the '73 T140 motor kind of neat since you can even drop it straight into a 1964-'70 pre-OIF chassis. '74 models got the shifter on the left.

I did this same '72 T120 chassis -'73 T140 motor conversion some years ago and, if I remember correctly, there were some alignment or reach issues with the rubber airbox boots not lining up quite right with the carbs on the 750 motor. Something about the '71-'72 high frame model airboxes and the 1/2" shorter 750 motor comes to mind. It still panned out somehow. Just be prepared for some fettling.
Cheers, Bret @ Glass from the Past


Cheers, Bret @ Glass from the Past
Re: Will a 750 5speed engine fit a 72 frame? #126434
10/17/07 12:37 pm
10/17/07 12:37 pm
Joined: Aug 2001
Posts: 6,891
Vermont
Jon W. Whitley Online content

BritBike Forum member
Jon W. Whitley  Online Content

BritBike Forum member
Joined: Aug 2001
Posts: 6,891
Vermont
The later left side shift engine will fit in all 650 and 750 Unit frames from 1963-up.When doing so, you can convert to right hand shift.....a fairly easy-straight forward operation. If wanting to stay with the left side shift, swap the drum brake swingarm for the disc brake swing arm and appropriate parts.This swing arm swap only applies to the 1971 and up OIF frames wink

beerchug


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project

Re: Will a 750 5speed engine fit a 72 frame? #126435
10/17/07 1:05 pm
10/17/07 1:05 pm
Joined: Nov 2005
Posts: 7,330
Back on the mainland!
JubeePrince Offline

Life member
JubeePrince  Offline

Life member
Joined: Nov 2005
Posts: 7,330
Back on the mainland!
Quote:
Originally posted by Bret Edwards:
'74 models got the shifter on the left.
IIRC, the 750 twins went to left-hand shift in the '76 model year.....

And wouldn't the short-rod 750's fit better in the frame than the long-rod 650's??

Cheers,

Steve


'77 T140J
"Vintage Bike". What's in your garage?

"The paying customer is always right."

Fitting round pegs into square holes since 1961...
Re: Will a 750 5speed engine fit a 72 frame? #126436
10/17/07 2:44 pm
10/17/07 2:44 pm
Joined: Aug 2001
Posts: 151
Canby, Oregon
B
Bret Edwards Offline
BritBike Forum member
Bret Edwards  Offline
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B
Joined: Aug 2001
Posts: 151
Canby, Oregon
Actually Jubee,
We both were off the mark a bit. 1975 was the first of the left side shifters. But since not very many 1974 bikes left the factory due to the worker's cooperative blockade, most right side shift T140 motors found will be 1973 models.

Cheers, Bret @ Glass from the Past


Cheers, Bret @ Glass from the Past
Re: Will a 750 5speed engine fit a 72 frame? #126437
10/17/07 3:09 pm
10/17/07 3:09 pm
Joined: Aug 2001
Posts: 151
Canby, Oregon
B
Bret Edwards Offline
BritBike Forum member
Bret Edwards  Offline
BritBike Forum member
B
Joined: Aug 2001
Posts: 151
Canby, Oregon
Quote:
Originally posted by Jon W. Whitley:
The later left side shift engine will fit in all 650 and 750 Unit frames from 1963-up.When doing so, you can convert to right hand shift.....a fairly easy-straight forward operation. If wanting to stay with the left side shift, swap the drum brake swingarm for the disc brake swing arm and appropriate parts.

beerchug
Jon,
Most here know what you meant, but just to clarify for any newbies. The reference to swapping the disc and drum swingarms and brakes is only for the 1971 and up OIF chassis. The OIF disc swingarms will not install into 1963-70 pre-OIF chassis. Anything is possible with enough work, but it's not a 'plug and play'.
Cheers, Bret @ Glass from the Past


Cheers, Bret @ Glass from the Past
Re: Will a 750 5speed engine fit a 72 frame? #126438
10/17/07 4:32 pm
10/17/07 4:32 pm
Joined: Aug 2001
Posts: 6,891
Vermont
Jon W. Whitley Online content

BritBike Forum member
Jon W. Whitley  Online Content

BritBike Forum member
Joined: Aug 2001
Posts: 6,891
Vermont
Thanks Bret,

I have edited my post to include that disclaimer! It didn't even cross my mind to add such a thing,taking for granted that everyone would know I was referring to the OIF frames, but then I pictured a guy trying to fit a later swing-arm onto a 1963-1970 frame, puzzled and cursing the guys giving advice on the board! beerchug


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project


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