Triumph T140 forks to pre OIF 650 frame

Have a 1968 Triumph 650 frame; and a 1977 Triumph T140 front end for install on it. I converted the steering head bearings to tapered rollers like this:

https://www.lowbrowcustoms.com/brit...MIp_n0zr7V3gIVS_7jBx1L_woJEAQYASABEgILlvD_BwE

And; I added spacers to make the OIF triple tree fit. (bought from Klempf's British parts ... many years ago.) not much bite of the yoke stem nut though. Any one else done this?

I did something similar years ago and got my machinist mate to make me an extended stem nut.
sam

Yes, I installed a 71 front end on a 68 frame using a roller bearing kit...The stem nut threaded on enough not to be a problem...I did this work for a guy and he gave me the parts, I assume it was the usual bearing kit and nothing special? I believe if the nut threads on at least half an inch ,it'll be should be ok....?

I appreciate the responses. There is at least a half an inch of the stem, that I got the threads to bite on to, so should be ok? Years ago I installed a 1971 "conical" front end, to a 1969 Triumph 650 I had. Used the same tapered roller bearings AND spacer kit. However, if memory serve me right; there was a "good three fourths of an inch" that there was threads of the lower yoke stem to "bite" on to. Maybe I'm just getting older and memory fading too though ...

Usual rule is the nut should thread on the depth of the nut..A "regular" nut for that size thread might be 3/4 inch thick?

A bottom yoke and stem top nut from a disc brake Trident would be a better option.

Geoff, after some more research I agree. Didn't know at the time that the T150 yoke was just a bit longer.