1967/1969 Bonnie Rebuild Desert Sled Project - Any Advice

Can you get it positioned into the vice to get some pressure onto the lock nut while turning it. Probably not. Small piece of tube over the stud onto the stator then use a nut to pressure it that way. Again probably not. Double nut the stud and weld the lock nut onto a bar that is then held in the vice. Bugger, nope.
It'll be a cutting job then, drill the lock nut and split it.
You'll probably need a new stud (or all three if the thread failed in the stud, I wouldn't trust any of them) and obviously good quality lock nuts.
I would bin all the shite lock nuts if the thread has gone in that one. 20lbs is the required torque on these, no loctite needed.

 

20 will strip the stud, in my sorry experience. i just tighten em up to firm wrist tight.

if the nut is spinning but wont come off its likely the stud is history

 

As a rule as long as you see the threads poking thru adjusters its ok and make sure you adjust each one so as the plate lifts equally, i just do it by eye but some like there dial gauges lol. Make sure you have set the pushrod adjuster as well with a slack cable and from fully screwed in 1/4 to a 1/2 a turn out

 

ive done it with a dial indicator and its no better than by eye,. dial indicator accuracy is really over kill on this.

i pull in th eclutch lever and tie it there with cord, then lean over the bike seat from the right and rotste the clutch basket with th ekickstart lever.

you can see the wobbling of the raised pressure plate quite clearly doing this, and its easy to get right

 

how did you measure this? im curious

 

no, thats perfect. i use a piece of soda bottle jug as a rough check for clearance, and then if theres a question i use a set of old brass feeler gauges that used to be sold for adjusting electronic ignitions.

the magnetic rotor makes a steel feeler gauge difficult to use, but brass slides in and out with no difficulty.

 

https://www.amazon.com/Stanley-Prot...rds=brass+feeler+gauges&qid=1649368094&sr=8-6

still around

 

Something like the BSA spitfire clamps with a P clip around the frame tube and a nut bolt and spacer would work https://www.baxtercycle.com/product/42-2698/

 

damn

i havent had a motorcycle look that nice since margaret stole the kiddies milk

are ytou planning on changing that pipe length or adding mufflers?

 

I prefer open pipes but have used baffles like this in the past on customers bikes. https://www.classicbritishspares.com/products/emgo-exhaust-pipe-baffles

 

ride it first and see how you like it before changig anything.

it will be quite loud, but depending on where you live that might not be a problem. not an issue for me in rural ohio.

open pipes have a significant effect on your power curve. mufflers of any kind tend to spread the power peak and lower it some, while the sharp cut off of open pipes will give generally you a higher but narrower peak.

you may like what you get just fine. ive run stock open 1-3/8-inch pipes on a T120 and it worked great for what i wanted, but was a bit faster with 17--inch reverse cone open megaphones. right now i run an ancient 2-into1 alphabet header that is slower than both, but works better at lower speeds.

open pipes can sometimes give you an overrich condition around3000 to 4000 rpm because of reversion. megaphones can make that worse. youll notice it when you accellerate slowly and suddenly the motor will start to motorboat and accelerate sluggishly. then when you get past it the mnotor will catch and run clean.

it happens because of reversion from the pipes at cam overlap, when a pressure pulse from the end of the exhaust pipe travels back across the piston and through the open intake valve. it reverses the incoming mixture and pushes it out over the jets through the bellmouth, then sucks it back in again. the result is that the intake charge passes the jets three times and becomes overricjh in that rpm range. its just rpm related. has nothing to do with throttle position.

you can see it happen with the machine on a stand when you blip the throttle. a cloud of mixture will suddenly appear in front of the carburetter, and then it will get sucked in. i have a video of it that ill see if i can find.