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1968 T100S #539480
04/23/14 7:24 am
04/23/14 7:24 am
Joined: Dec 2013
Posts: 3
england
S
stavely Offline OP
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stavely  Offline OP
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england
Hi guys,
I'm looking to buy a Daytona.I know what a T100R is and a T100T, i know what a SS is but what is a T100S? I'm not familiar with the S specification.
Should it be twin or single carb, should it have the better crank end bearing with blister on the timing case?
was it sold in UK or is it a USA model?
cheers everyone

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Re: 1968 T100S [Re: stavely] #539544
04/23/14 1:54 pm
04/23/14 1:54 pm
Joined: Jun 2002
Posts: 9,972
Scotland
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Stuart Offline
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Stuart  Offline
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Hi,

Originally Posted By: stavely
what is a T100S?
Should it be twin or single carb,

Hopefully you'll know that the T100R and T100T are both twin-carb., the 'R' being US spec. and the 'T' being UK & General Export spec., but only 'til the end of the '70 season?

As Nick says, 'S' is single carb., but again, ostensibly UK&GE spec. - if you look at http://www.bigdcycle.com/books.html and then the first few pages of the '67, '68 and '69 books, you'll see the styling differences between a UK&GE 'S' and a US-market 'C'.

Originally Posted By: stavely
should it have the better crank end bearing with blister

The "blister" for the timing-side ball main bearing appears only on '69-on timing-side crankcases; prior to that, there is a (different) ball main bearing on the drive side with a bush on the timing side.

An 'S' got whatever was specified when it was built; i.e. a '67 or '68 'S' will have drive-side ball and timing-side bush, a '69 or '70 'S' will have drive-side roller and timing-side ball.

Originally Posted By: stavely
was it sold in UK or is it a USA model?

As I say, "ostensibly" the 'S' was a UK&GE model; however:-

a. Canada was supplied direct from Meriden with UK&GE models; they certainly gravitated second-hand over the border into the US;

b. over the years, I've read several posts about buying allegedly-UK&GE-spec. bikes new in the US, and a long way from the Canada/US border ...

Finally, when looking at '68 and '69 'C'-range (unit 350 and 500), bear in mind that the first '69-season bikes were 2200-odd stamped with the 'H'-and-five-figure engine and and frame number (H65573 and above) used in previous seasons. Nevertheless, these bikes all have the '69-on main bearings, oil pressure switch (originally taper-thread), left-hand UNF thread tacho. gearbox mounting, etc. ... but the primary, timing and gearbox covers are still mounted with (1/4") BSF screws ... whistle

Hth.

Regards,

Re: 1968 T100S [Re: stavely] #539801
04/25/14 5:08 am
04/25/14 5:08 am
Joined: Dec 2013
Posts: 3
england
S
stavely Offline OP
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stavely  Offline OP
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england
OK thanks guys that's cleared it up. This bike is stamped T100S and has an engine number starting ED.
So its not an original Daytona but a 500 with a twin carb conversion. I love this site you folk are a font of accurate information. thanks again.

Last edited by stavely; 04/25/14 5:17 am.
Re: 1968 T100S [Re: stavely] #539807
04/25/14 7:55 am
04/25/14 7:55 am
Joined: Jun 2002
Posts: 9,972
Scotland
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Stuart Offline
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Stuart  Offline
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Hi,

Originally Posted By: stavely
bike is stamped T100S and has an engine number starting ED.
So its not an original Daytona but a 500 with a twin carb conversion.

At May 1970, that'd be one of the last S's built; even if it was built precisely according to the parts book, there were still very few differences between any of the single- and twin-carb. variants. Forty-four years and an unknown number of owners/rebuilds later, sorting the d.p.o. cock-ups is going to make more difference to it as a usable 21st century bike than any notional specification differences when it was new.

Fwiw, my T100R has a single-carb. manifold.

Hth.

Regards,

Re: 1968 T100S [Re: stavely] #539901
04/26/14 1:08 am
04/26/14 1:08 am
Joined: Jul 2011
Posts: 131
TN/VA/FL USA
F
fried okra Offline
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fried okra  Offline
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TN/VA/FL USA
Stuart, you are running a 26mm AMAL Concentric single carb on your T100R or??

thanks,
fried okra

Re: 1968 T100S [Re: fried okra] #539902
04/26/14 1:57 am
04/26/14 1:57 am
Joined: Jun 2002
Posts: 9,972
Scotland
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Stuart Offline
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Stuart  Offline
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Scotland
Hi,

Originally Posted By: fried okra
you are running a 26mm Amal Concentric single carb on your T100R

At the moment. On the to-do list is "try a 28mm", set up like a TR5T.

Hth.

Regards,

Re: 1968 T100S [Re: stavely] #539912
04/26/14 3:03 am
04/26/14 3:03 am
Joined: Oct 2007
Posts: 1,311
Nanaimo, B.C. Canada
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Wilfred Online content
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Nanaimo, B.C. Canada
stavely. what Stuart said. There are cycle differences as well. I have a 67 Daytona which is in a 70 T100S cycle. It came with a WM2 18 front rim with the 7 inch TLS brake which works very well. Also, the rear rim is a WM2 18, not a WM3 18 as on the Daytona. I have recently had an 8 inch TLS hub laced into a 18 inch front rim mostly because it looks the part but there is nothing wrong with the 7 inch TLS if that is what you have. As has been often said, the unit T100, whatever the model, is a sweet ride. I have been running mine with a 930 carb which works well although I am going back to a couple of 626 carbs for no particularly good reason except that it is fun to tinker and the 930 has been on it for almost 20 years.......My 68 Daytona which is becoming an ISDT replica came with a 928 on it so Stuart is probably on the right track for his next thing on his to do list. Whatever you have or are contemplating having in a T100 should be good.

Cheers, Wilf


"It's about the ride..."
Re: 1968 T100S [Re: stavely] #539921
04/26/14 4:45 am
04/26/14 4:45 am
Joined: Oct 2013
Posts: 369
Essex England
P
paul67 Offline
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Essex England
the 28mm carb is a good idea i may well try that myself on my 67/8 T100R, i have twin 26mm on at the moment and runs well with them but single carb is easier to tune and as i have high pipes on with large enduro tyres its all ready got the off road look(thats right for me)

Re: 1968 T100S [Re: stavely] #539925
04/26/14 6:18 am
04/26/14 6:18 am
Joined: Aug 2001
Posts: 7,459
scotland
triton thrasher Offline
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scotland
Originally Posted By: paul67
the 28mm carb is a good idea i may well try that myself on my 67/8 T100R, i have twin 26mm on at the moment and runs well with them but single carb is easier to tune


Cheaper to try a single 26mm setup first, using one of your carbs.

Then, if you try a single 28mm in future, you'll have a comparison.


Amateur Loctite enthusiast.
Re: 1968 T100S [Re: Wilfred] #539927
04/26/14 6:40 am
04/26/14 6:40 am
Joined: Jun 2002
Posts: 9,972
Scotland
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Stuart Offline
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Stuart  Offline
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Hi,

Originally Posted By: Wilfred
Also, the rear rim is a WM2 18, not a WM3 18 as on the Daytona.

Mmmm ... what I mean about different specs. grin US-market "R" Daytonas had a WM3 (with a 4.00 tyre) but, certainly according to the parts books, UK&GE "T" Daytonas had the same WM2 rim and 3.50 tyre as the 'S'.

But then, if you take modern advice from the tyre makers, they'd say a 3.50 should've been on a WM3 in the first place and, especially if you're fitting the bike with the modern-equivalent 4.10 or 100/90, it should be on a WM3 (as WM4 won't fit aiui).

Similarly, at the front:-

. '67 and '68 "T's" are shown as having an 18" (WM2) rim;

. '69 parts book is a bit vague, with the model spec. sheet near the front still showing 18" but the corresponding part numbers missing from the "Front Wheel" parts listing;

. '70 "T" is shown as having the the same 19" rim (with the 8" brake) as the "R".

laughing

Hth.

Regards,

Re: 1968 T100S [Re: paul67] #539928
04/26/14 6:56 am
04/26/14 6:56 am
Joined: Jun 2002
Posts: 9,972
Scotland
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Stuart Offline
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Stuart  Offline
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Hi Paul,

Originally Posted By: paul67
the 28mm carb is a good idea i may well try that myself on my 67/8 T100R,

Risking telling you things you know already, there are different single-carb. manifolds:-

. Sometime around '68/beginning of '69, Meriden went from 1/4" (BSF/Cycle) to 5/16" (UNC/UNF) manifold mounting studs into the head, the later studs are also slightly further apart. Afaict, because more twin-carb. 500's were sold after this change, the later single-carb. manifold is now somewhat rare/desirable/expensive. frown

. On the later manifolds, either the carb. inlet hole was badly-made or it was subtly modified between the T100C and TR5T ... because there are different hole diameters. Because my T100 started out assembled from parts, I was pleased to find the manifold hole was big enough for a 28mm carb. without enlargement, but I have seen smaller ones.

Otoh, all the 'earlier' single-carb. manifolds I've seen had an inlet smaller than 28mm.

Hth.

Regards,

Re: 1968 T100S [Re: stavely] #539944
04/26/14 9:47 am
04/26/14 9:47 am
Joined: Dec 2006
Posts: 269
Stamford
paulberry Offline
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Stamford
The later 500 single carb manifolds (70-7578) are available new. I bought one a few years ago when the lug on my original cracked. However the cast/finish on the inside was very poor and as it is very difficult to polish or clean up I ended up buying a good OE one.
Hopefully the quality issue has now been sorted if anybody knows?

Paul

Last edited by paulberry; 04/26/14 9:53 am. Reason: spelling correction

1969 T100S
1955 Tiger Cub
Re: 1968 T100S [Re: stavely] #539961
04/26/14 11:04 am
04/26/14 11:04 am
Joined: Feb 2008
Posts: 4,359
New Jersey USA
Tridentman Online content

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Tridentman  Online Content

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New Jersey USA
Wilf is in Canada so probably has a Canadian bike. And they were not the US model but UK&GE?--this may explain the rear rim size?
HTH


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