1972 450 engine questions

mark your spokes with a texta, photograph extensively then disassemble. should be able to piece the puzzle back together.

The thrust washer is needed to keep the clutch hub from spinning directly on the brass bushing.

The 72 450 came with the gray forks. These black forks are off of the next generation Huskys. They're magnesium (super light) with about an inch more travel. Excellent upgrade.

Thanks Crash, I do have the washer under the clutch hub, the washer I missed was inside between the main shaft and the clutch bushing. In the video you can se the lateral play in the shaft. The book shows one there for the 6 speed trans. I disassembled and installed one there. Is that correct or should there be play in that shaft?
So those lowers are from a later year? What year do you think? I guess I should measure them for new seals, these are leaking.

Can anyone tell me what this collar is for? I didn't see it in the parts list. It seems to fit ok and looks like it just supports the shaft in the clutch case.

I also polished up the speedo bracket, came out better than I expected.

I also cleaned the backing plate and coils, I put new connectors on the wires and will connect them behind the plate. Check out those crimps, Thank You Vintage Connections!

Yes there is suppose to be a washer between the case bearing and the gear. I watched your YouTube of the lateral play in the primary shaft and it is excessive. The ledge at the bottom of the spline that accepts the clutch hub should be at the same height as the brass bushing, + or - 1mm, when the cases are screwed together tight.

While assembling the primary shaft did you check and double check the thrust washer placement between the gears? Did the ring-clip get installed? Are your new bearings the correct width?

My understanding is that the black forks initially appeared on the 74 MK frame bikes. I wouldn't be surprised if they showed up on some late 73 models. The next era bike I spoke of was the 1975 ML frame bikes with the mag engine, cantilevered frame and lay down shocks.

Vintage Connections is where I buy my electrical stuff as well. That crimping tool and connections they sell are the best!

While assembling the primary shaft did you check and double check the thrust washer placement between the gears?
Yes all there.
Did the ring-clip get installed?
Yes.
Are your new bearings the correct width?
I hope so , I bought them from John Lefeve. But did not measure them against the old one. My bad.
Those forks look pretty good except the leaking seals, I'll measure them today.
I liked that Vintage Connections gives you some practice parts, and the covers are sweet. they also have the sheathing!

If the bearings are from LeFevre then I'd say they're okay. You could shim up the opposite end of the shaft. I've done it with a 5 spd trans when lateral play got sloppy. Once shimmed up make sure the dogs on each gear engage and disengage properly. I used McMaster Carr shims 1/2 x 3/4 x .025.

Curious, how is the lateral play in the counter shaft?

Crash , that's what I did. I added a 1mm shim the declutch shaft side bearing end of the main shaft. Everything shifted fine and the whole trans rotated as it should. There is no play in the counter shaft which leads me to think either the main shaft is worn or the clutch bushing is, and if the bushing is , it is probably on the main shaft side. But I did not see any wear on that side, the four slots? look normal. All of the gears looked in good condition. But if it shifts like it's supposed to I'll take it. Any info on the shift shaft with the collar?

If this thread is any indication, it'll be 50 pages long by the time this bike is never heard from again!!

Four slots in the bushing is normal. Total length of each of the three bushing I have is approx. 33.5mm. The flanged end averages about 2.5mm thick on the 3 I have.

Thinking about it, as the clutch hub is tightened up it will pull shaft towards the base of the hub until the hub washer seats against the ledge at the base of the shaft splines. That will keep the shaft from walking in and out. Still strange to me that theres so much lateral play. In all the 5 spds I've had apart I've seen only about half the amount of play your YouTube vid showed.

I must have missed one of your previous posts because I don't understand your question.

It's a GREAT Monday.
View: https://youtu.be/F0Ec_y6lsYw
Thanks for ALL the help. I may have been able to do it alone but I'm glad I didn't have too. Like everyone else I won't look at the receipts. And I still need to finish the rest. God Help Me!! Thanks Again to All. Chris ps... I hope when I kick the bucket my wife doesn't sell it for what I told her I paid for It!!

Congrats! Always great to start a bike for the first time

Finally ordered the levers and cables for Matt@SpeedandSport. Got it set up and road it for the first time on Saturday. Pretty awesome. Float was too high and bled all over the motor. All that's left is to get the tank back from powder and to make a frame for the tool bag. Also a cable for the speedo. The bike looks very nice, even with the dirty wheels. Ah, the Mighty Led Zepplin!! and my scooter AREAR!

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bikes looking really good, better than robert plants suzuki..altho he has a front brake!

you just know bonham talked these two into going riding..

I was wondering what Johns bike was? Did they have a fat cat back then? Or is that a tri zinger? Looks like Jimmy's wearing vintage adidas. Pretty cool pic.

im going with ts 400 act trike and ts 250...

So It's been a while since I've posted on this thread. Lots of other projects. I took the 450 upstate and rode it, and had no fourth gear-1st,2nd,3rd,no fourth,5th,6th. All other gears worked perfect and no amount of jerking it around would get fourth to engage. I took it apart today and found the following