The last Triumph 650 single carb was built in 1983 and was a TR65 Thunderbird. This was a 650 version of the TR7R (shorter stroke). I do not think it was offered in the US. It is very nice bike to ride and it almost vibration free. Only some 400 were built 82/83 in total.
The last of the 650 single carb for the US market was the 1973 TR6RV although how many actually went to the US in 73 I am not sure.
Whilst the last unit 650 engine was the TR65 Thunderbird, the last 650 model was the TR65T Tiger Trail produced late 1981 until deleted with it's 750 sister TR7T at the end of 1982.
Although thought to be the better engine for the trail, it was priced -strangely- the same as the 750 TR7T Tiger Trail as - well, people wanted more cubes for their money....so, only six- count 'em- were made ! Two went to Muryama Motors of Japan and the rest within the UK.
There's a genuine TR65T on display at the London Motorcycle Museum where , as some may know, there's a celebration of the Thunderbird model on 4th July this year
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