I emailed JetsRus and queried the correct jet.
The main jet out of my '77 Carb measures:
Length 8.1mm
Thread Diameter 7.9mm
Unthreaded Diameter 6.9mm
This is quite different to the ones listed.

Here is the Reply I got
"
i dont have a match for that #62 jet is 99114-077-0620, it is not  the 99101-124, the thread dimensions are too far off.  If you have an extra jet I can send it off and see about getting some machined but no guarantees and they wont return the jet to me.

Please reply to this email with all prior emails. It is the only way I can keep up with the situation.
Thank you! Mike"

I was going to send a spare jet but I've just found a #75 on ebay so I've ordered that. It is an option worth thinking about though if anyone needs specific size jets.








Last Edited By: 456eec May 15 14 4:20 PM. Edited 1 times.