Restoration of 1958 Triumph 5TA with very limited resources,
mufflers, tank badges, ignition switch, horn and dipper switch and few extra are mission and i m trying to acquire to finish the job.

Engine has been fully restored, new crank shafts, piston and rings and new bushes. Gear box been repaired also.

Appreciate comments, positive or negative.

That top main frame tube definitely looks to have been bent and straightened, better keep the bike under 150KPH!!

hee hee

Looks like a good work in progress, I want to see photos of the finished bike. how is the paint on the fuel tank?

__________________
GrandPaulZ
Author of "Old Bikes"
Born Again Bikes
My Photos

That appears to be unit construction??? What are the engine and frame numbers? Please post more photos’s of the front and back end. Looks good so far, and need to see the finished product. That also appears to be a later frame???
BB

dear fellows,

yes, this is an unit construction, engine and frame has matching number i.e. 12055. tomorrow is Sunday and i will take more picture.

Muffler and exhaust bend will be ready by Tuesday, after that i will add more picture. I still searching for switch, ampermeter and horn dipper switch.

Jan

Are there any letters in front of the numbers? Question: Were the any unite constructions in 1958?
BB

5TA is written before the engine number.

"Triumph re-entered the 350cc class in 1957 with the introduction of the Twenty One, the first of a new range of unit-construction twins."

http://www.motorbase.com/auctionlot/by-id/1214499944

Seems unit construction starts from 1957, one more thing to tell that when i open the clutch cove, i see 59 written in a round circle, does it mean its a 1959 production or what.

My papers says 1958 but since there were no computerized motor registration department back in those days and everything written by hand, possibilities are on higher side for a written mistake.

Something is not making sense to me? What is the cc's?

Triumph - Twins 1950 - 69 Year Engine No. Unit 350 & 500cc Engine No. Pre-Unit 500 & 650cc
Engine & frame numbers on these models were all the same & were preceded by the model code. The N suffix was used in 1950 & NA for 1951/2. 350/500 twins all used an H prefix. The 650 models with the duplex frame used a D prefix & unit 650 duplex used a DU prefix. Additional suffixes were used to designate model type or condition eg. TT (model type), C (high compression) or P (police). Some of these only appeared in certain markets.
1950 From 100N
1951 101NA - 15808NA
1952 15809NA - 25000NA, then 25000 - 32302
1953 32303 - 44134
1954 44135 - 56699
1955 56700 - 70929
1956 70930 - 82799, then 0100 - 0944
1957 H101 - H760 0945 - 011115
1958 H761 - H5484 011116 - 020075
1959 H5485 - H11511 020076 - 029363
1960 H11512 - H18611 029364 - 030424, then D101 - D7726
1961 H18612 - H25251 D7727 - D15788
1962 H25252 - H29732 D15789 on
Engine No. Unit 650cc
1963 H29733 - H32464 DU101 - DU5824
1964 H32465 - H35986 DU5825 - DU13374
1965 H35987 - H40527 DU13375 - DU24874
1966 H40528 - H49832 DU24875 - DU44393
1967 H49833 - H57082 DU44394 - DU66245
1968 H57083 - H65572 DU66246 - DU85903
1969 H65573 - H67331 DU85904 - DU90282



Triumph Twins, Triples & Singles - 1969-1983 Letter Month Model Year
During 1969 a new number system was introduced which used a two-letter prefix indicating month & year, followed by the model type & the serial number. The first letter is the month, the second the year. This system used the Triumph model year not calendar year, which ran from August of the previous year to July of the current year. From July 1980 a third letter A was added to allow the system to keep going. Many model types included a V which designates a 5 speed gearbox.



For example: T140V HK12345 - is a 5 speed T140 model built in July of model year 1974/75.

Also; T140E NDA12345 - Is a T140E model built in October of model year 1982.

A January Aug 1978 - July 1979
B February Aug 1979 - July 1980
C March Aug 1968 - July 1969
D April Aug 1969 - July 1970
E May Aug 1970 - July 1971
G June Aug 1971 - July 1972
H July Aug 1972 - July 1973
J August Aug 1973 - July 1974
K September Aug 1974 - July 1975
N October Aug 1975 - July 1976
P November Aug 1976 - July 1977
X December Aug 1977 - July 1978
KDA 1981 models Sept 1980 - Apr 1981
EDA 1982 models May 1981 - Jan 1982
BEA 1983 models Feb 1982 - Jan 1983
T140V AEA34393 - Last model Jan 21st, 1983



Harris Twins - 1985-1988 Year Engine & Frame Number
The easiest of the lot. The numbers were used for both Bonneville & Tiger models irrelevant of model type. 1985 FN000002 - FN000191
1986 GN000192 - GN000788
1987 HN000789 - HN001176
1988 JN001177 - JN001258

Dear Bushybester,

I was confused also when i read your post but got satisfied with the following link, see attached picture also. according to list it is 1957 production.

http://members.aol.com/tiocbima/serial_numbers.htm

please help me if i am wrong.

Jan

Bushy,

Jan's got nothing to worry about. Most of think of preunits being the norm until 1963 when the 650's went over to unit construction. What is less commonly know is that they borrowed this technology from the smaller bikes so a unit constriction engine on this bike is completely correct.

Good work Jan. I can't wait to see the finished project.