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T20 Cub questions #337345
10/09/10 3:58 pm
10/09/10 3:58 pm
Joined: Sep 2007
Posts: 202
Tampa, FL
T
trumpettwin Offline OP
BritBike Forum member
trumpettwin  Offline OP
BritBike Forum member
T
Joined: Sep 2007
Posts: 202
Tampa, FL
I bought a 65 Mountain Cub on eBay. The PO said that the engine had been rebuilt. eek It runs good with no smoke or blowby. I got two new tires and a box load of parts to go with it.



tired The clutch wouldn’t release which I traced to an unwound spring in the clutch. My wife fell in love with it so we did the 4 hour cleanup and a box of SOS pads later, here is what we found.




beerchug
There is a spot of light rust pitting on the rear rim about the size of a dime and one on the front rim about half that size. So now I have a Cub resto project that has vaulted to the top of my resto list. I’ve done many a motorcycle in my time but never a Cub.
The questions:
1. It is titled as a 1965 but the VIN says: T20SM692 That suggests that Cubbie is a 1966 (so do the frame and engine). I understand that the Cubs changed significantly from 65 to 66 and I want to buy the right parts.
2. The rear fender is not alloy but the tank and fender paint matches perfect and both are shiny and unmarred originals. The front fender is alloy and nearly perfect. Isn’t the Mountain Cub supposed to have an alloy rear fender?
3. I need a good seat, if anyone has an extra to sell.
4. Is there anything special I should I know before I begin?

Thanks for your help.
Randy


65 T20 Mountain Cub
69 TR6R (with 73 TR7R engine)
73 TR5T
77 T140V
79 ES Street Tracker (in the planning stage)
Enough parts to build a couple more. smile
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Re: T20 Cub questions [Re: trumpettwin] #337351
10/09/10 4:32 pm
10/09/10 4:32 pm
Joined: Sep 2001
Posts: 2,796
Comox BC Canada
G
Gordo in Comox Offline
BritBike Forum member
Gordo in Comox  Offline
BritBike Forum member
G
Joined: Sep 2001
Posts: 2,796
Comox BC Canada
Nice snag! That is a sweet little machine.

Gordo


Without frequent roadside repairs there is no fun in riding!
Re: T20 Cub questions [Re: trumpettwin] #337354
10/09/10 5:06 pm
10/09/10 5:06 pm
Joined: Aug 2001
Posts: 1,880
The Northwoods... Michigan
Steve Erickson Offline
BritBike Forum member
Steve Erickson  Offline
BritBike Forum member
Joined: Aug 2001
Posts: 1,880
The Northwoods... Michigan
I don't have the numbers readily available, but SM would indicate 64/65, in 66/67 the ID changed to T20M. And, your taillight is a one year only for 65.

I think the fenders were alloy for 64/65, and stock color tank for 65 would have been Hunter Yellow (64 blue and silver, 66 "orange" and white), so I question the tank and fender being unmarred originals. Your colors are stock Cub colors, but not Mountain Cub.

If you are going for correct, I'm pretty sure the aircleaner is wrong... in 66 it was a Volkes D-shaped can, I think earlier was a set-up unique to the Cub... but they may have had the Volkes in 65?

Also, it would have come stock with ET ignition. Though yours would be considered an improvement by most folks.

The under tank reflectors wouldn't have come on it.

But a neat little bike, should be a pretty simple restoration. Have fun!

Re: T20 Cub questions [Re: Steve Erickson] #337357
10/09/10 5:23 pm
10/09/10 5:23 pm
Joined: Sep 2007
Posts: 202
Tampa, FL
T
trumpettwin Offline OP
BritBike Forum member
trumpettwin  Offline OP
BritBike Forum member
T
Joined: Sep 2007
Posts: 202
Tampa, FL
Thanks. The numbers I have say that 65 was T20XX 97XXX on and the 66 are t20XX 101 on. So the 692 would indicate 66 unless they ran out of numbers late 65 and started over then. The 66 parts book calls out a T20SM (wish I had a 65). The bike is so original in that the little parts are all there, correct nuts and bolts etc. I'm sure the tank and fender is a matched set but I don't think they came with this bike but they are too good to change.


65 T20 Mountain Cub
69 TR6R (with 73 TR7R engine)
73 TR5T
77 T140V
79 ES Street Tracker (in the planning stage)
Enough parts to build a couple more. smile
Re: T20 Cub questions [Re: trumpettwin] #337384
10/09/10 9:36 pm
10/09/10 9:36 pm
Joined: Aug 2001
Posts: 1,880
The Northwoods... Michigan
Steve Erickson Offline
BritBike Forum member
Steve Erickson  Offline
BritBike Forum member
Joined: Aug 2001
Posts: 1,880
The Northwoods... Michigan
Look at the date stamp on the Monobloc... if it is original, it will have been made probably about a month before the bike's production.

Your bike is a round barrel... square barrel started in 66. However, I don't know if the square barrel, and the T20M designation started at the beginning of the model year, there possibly was a run of SM/round barrel models early in the 66 model year?

BTW, I checked my parts book, your aircleaner is correct for a SM.

There was never a parts book made for the 66/67 T20M Mountain Cubs , don't know why... the last parts book calls out T20SM beginning with 101, and doesn't show the T20M parts. Even shows the round barrel.

Re: T20 Cub questions [Re: trumpettwin] #338513
10/16/10 3:35 pm
10/16/10 3:35 pm
Joined: Mar 2007
Posts: 215
Southern California
Geoff Patrick Offline
Life member
Geoff Patrick  Offline
Life member
Joined: Mar 2007
Posts: 215
Southern California
I have a 64 Mountain Cub and it my be the funnest and definitely the youngest among my Triumphs to ride! It's no surprise that your wife fell in love with it, chicks REALLY dig the Cub...it's a "chick magnet"! No doubt one other reason it's my fave to ride!

gp


Watch "American Triumph" at www.americantriumph.tv
Re: T20 Cub questions [Re: trumpettwin] #338517
10/16/10 3:48 pm
10/16/10 3:48 pm
Joined: Sep 2007
Posts: 202
Tampa, FL
T
trumpettwin Offline OP
BritBike Forum member
trumpettwin  Offline OP
BritBike Forum member
T
Joined: Sep 2007
Posts: 202
Tampa, FL
Thanks guys! I'm waiting on the clutch parts so I can take it around the block and figure out what needs to be done. Then it comes apart. The resto will be more like a disassemble, clean/paint and reassemble.


65 T20 Mountain Cub
69 TR6R (with 73 TR7R engine)
73 TR5T
77 T140V
79 ES Street Tracker (in the planning stage)
Enough parts to build a couple more. smile

Moderated by  John Healy 


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