One thing that struck me is that the cam chain tensioner is on upside down. I guess it would work that way, but I'd want to verify that the motor turns freely and has compression and that the tensioner is installed correctly before subjecting it to starting.
I rode a 450L once; not fast and not far. The bars are just weird, but that's an easy fix. And if you decide it's not working out, you could probably part it out and make money. Which is my answer to your question 'Is this bike a classic or antique'. I see them as organ donors. But if you're short, they're maybe a wonderful thing. Could be love….
The cam chain tensioner is correct for the period. Later models (85-on) used a different design.
I'm 6'4" 245ish, but it's about perfect for my wife, who is a scooter rider, and/or my daughter.
The bike has sat for a couple of years, but the tank did not look bad nor did it stink.
You know that smell - the smell of "maybe I better think about this" - it was not there, the tank was topped off with fresh alcohol free premium.
The battery wiring was a little wonky, but it appears acceptable for testing.
Yesterday I bought the wrong battery (YTX9-BS) for the application, but it was in stock and I knew it could work.
(I paid $20.00 more at a local shop that I could of bought it for because the owner is a good guy and they treat me like a human.)
Proper battery prep is critical to long life and something most ignore. Simple, I added the acid and let it sit for an hour. Then I connected it to my "smart" low amp charger and left it overnight. It will last.
Connected the positive cables to the battery, routed them through the other side and connected them.
Slide the battery all the way in, used some zip strips to hold it in place.
Connect the negative side - no sparks, nothing scary.
Turned the fuel to prime - and hit the start button.
Nothing happened.
For a moment, a flashing moment, I felt a little bit of a feeling I've not enjoyed, ever. But it was brief, and I quickly started at the top of the troubleshooting list:
Check kill switch
That was it, hit the starter button, cranked over fine.
It took a little time for the fuel to work its way into the carbs, but once I put the choke in the correct position, it fired right up.
Let it idle a bit, checked it over, had to take it for a ride, had too.
I understand that is a mistake, a flaw in judgement, but that is who I am.
No front brake, those were inoperative, the rear worked, whatever.
Took off and the bike performed well through the gears, no worries.
The bike starts to develop a wobble at speed, and I remember that I did not check the flat looking now nearly totally flat coming off the bead tires.
Rode very slow back to the sellers house.
The owner found his air pump, they inflated fine, whew.
What about that front brake -
Opened up the master cylinder cover and there was fluid - checked the bleeder on the caliper, some came out -
Bled the fitting at the master to the upper line and a big pocket of air came right out and the brakes felt great.
Next test ride was longer, for the money, it's a great bike.
The handlebars are bent, easily replaced. And the forks tweaked a little to the left, not enough to worry me, enough that I believe I can take out when I check the steering head bearings.
It's coming home shortly and my wife can start cleaning it up.
I'm still taken back at how well it ran, and for what it is, how fun it was to ride!