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changing main cases #131721
12/30/07 1:45 am
12/30/07 1:45 am
Joined: Nov 2007
Posts: 24
Knoxville,Tennessee
Tri-Hook Offline OP
BritBike Forum
Tri-Hook  Offline OP
BritBike Forum

Joined: Nov 2007
Posts: 24
Knoxville,Tennessee
I have a 1966 motor that has a broken case, the normal place above the countershaft sprocket.
I would like to pull everything out of those cases and put into a set of 1970 cases.
My question: does anyone know of any problems I might run into doing ?
I would like to change everything , bearings ,ect.
Any thoughts would be appreciated.


Ronnie
Mostly Triumphs
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Re: changing main cases #131722
12/30/07 1:51 pm
12/30/07 1:51 pm
Joined: Jan 2005
Posts: 1,667
East Bethany New York
Dick Harris Offline
BritBike Forum member
Dick Harris  Offline
BritBike Forum member

Joined: Jan 2005
Posts: 1,667
East Bethany New York
Morn'n Tri-hook, no it won't work as the '66 engine has the bushing on the timing side and the '70 has a ball bearing in that position. Why not do it the easy way and get a good welder to replace the piece above the countershaft sprocket? Dick

Re: changing main cases #131723
12/30/07 8:43 pm
12/30/07 8:43 pm
Joined: Oct 2003
Posts: 3,725
Emsworth, sunny south of Engla...
D
dave jones Offline
BritBike Forum member
dave jones  Offline
BritBike Forum member
D

Joined: Oct 2003
Posts: 3,725
Emsworth, sunny south of Engla...
We are talking unit 650 engines, are we not? The bearings are identical but the engine breathing is different. A 1970 breathes into the chaincase via the roller bearing (no oil seal) plus there is an oil level hole on the 1970 (?) as there is no separate oil supply for the primary chain. The inlet camshaft is different on a 1970 (solid) but I don't think this would make any difference if you leave off the '66 breather assembly from your 66 camshaft. The exhaust tappet oil feed is different but if you put all the 66 bits in this doesn't make any difference.

I would double check this stuff before proceeding.

If I were you, and just like Dick suggests, I would have the 66 case repaired and this is exactly what I did on my 67. SRM did it and it really was a good job for not much money.
Dave

Re: changing main cases #131724
12/30/07 8:56 pm
12/30/07 8:56 pm
Joined: Jun 2007
Posts: 6,396
Maui Hawaii
HawaiianTiger Offline
BritBike Forum member
HawaiianTiger  Offline
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Joined: Jun 2007
Posts: 6,396
Maui Hawaii
Keep as much of the '70 motor as possible. There are light years worth of improvements between '66 and '70 that make the '70 worth while keeping, not the least of which is the gearbox which is tons better than the '66.


Bikes
1974 Commando
1985 Honda Nighthawk 650
1957 Thunderbird/T110 "Flying Tiger"
Antique Fans: Loads of Emersons (Two six wingers) plus gyros and orbiters.
Re: changing main cases #131725
12/31/07 2:35 pm
12/31/07 2:35 pm
Joined: Jan 2005
Posts: 1,667
East Bethany New York
Dick Harris Offline
BritBike Forum member
Dick Harris  Offline
BritBike Forum member

Joined: Jan 2005
Posts: 1,667
East Bethany New York
Dah, what made me think we were talking 500's? Guess I didn't put mind in proper gear. eek Dick


Moderated by  John Healy 

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