I did some digging through the old magazines (~2000+)down there. I found a July 1973 Cycle Illustrated that had the TR5T on the front cover and a 8 page article on setting one up for Enduros.
They used: Preston Petty Super Fenders front and back $5.95 + $7.95 Hodaka Mudflaps w/brackets $.96 ea 72 Penton headlight $16 Removed and plugged the tach and the oil pressure sender. Bultaco 250 SD Tailight $4.80 28mm Mikuni $32.00 Removed turn signals etc
And claimed a loss of 32 lbs
But in the seventeen photos, it appears they are using the stock exhaust. Then in the material list it has:
And almost at the end of the article it mentions using the "old style" muffler and exhaust to save weight and reduce damage. They then pointed out that in 400 miles of riding with the stock system they had leaves and other debris catch fire due to the stock pipes twice. Has anyone every see a 1966 500 Jackpine model or it's exhaust system ? or was this something Triumph made special and sent over for the race. Jeff
The standard spec includes a spark arrestor to meet US Forestry regs---but I guess they meant leaves etc being caught up under the low level exhaust system and catching fire there. Otherwise known as the patented Triumph system to make you go like hell so that the velocity puts the fire out!
In answer to your Jackpine question, that is a common moniker for the 66 T100C, so the exhaust referred to would just be the stock siamesed high pipe for that year.
Which doesn't work as stock on the TR5T, due to the close proximity of the downtube to exhaust port. They must have altered it to fit, or just never mounted it (maybe why you didn't see a picture?).
I'm surprised a Michigander isn't familiar with that term for that bike, Bill Baird was probably responsible for it being called as such. Though I don't know if it was ever an "official" designation, probably just a popularized magazine dubbing.
I've been referring to the 66 T100C as a Jackpine since, well, 66.
I grew up riding Poker Runs and Enduros and spent many years riding in the woods up by M 61 in Gladwin. I did not know if it was a official model or if they had put together something special for the race. I did some web searches and it looks like it was a unofficial nick name for the early T100C. Jeff
Continuing the topic drift for one more post, in looking at the 1966 Triumph USA sales brochure, it does refer to the T100C as "the famous Jack Pine" model.
Don't know if that makes it "official" or not, or if it would apply to other years? But it certainly does to the 66.
OK, back to twisty pipes... I have looked at one bike with the 66 exhaust, but the right side was altered to fit, something was changed with spigots, and the engine had to be removed to mount the pipe. Musta really wanted that look...