1972 450CR

The parts list started listing bolt sizes in 1973 and the 73 and 74 lists are pretty much the same as the 72. As far as replacement bolts, I've never heard of anyone having luck finding a source for BUFO bolts.

Never thought of looking at the later model parts catalog.

Confirmed my thoughts on the bolt sizes.

Thanks mucho.

Soon I'll button up the cases.
What sealant do you guys use on the engine seals or is the fit right enough to prevent leaks?

one of the guys here put me onto old SAAB and Volvo's and sure enough, they do have Bufo bolts on them, i had no luck finding the sizes i needed on the junkers i managed to track down but hey, they're out there.

Work has buried me but I managed to get the transmission in today. I didn't button up the bottom end because I found the detent springs and the detent sleeves in bad shape. This thing might have been jumping out of gear,the previous owner had stuffed ball bearings in the sleeve to boost the spring pressure. It might have worked but the detent is no longer pointed but well rounded over.

I looked at the few transmissions I have on the shelf and some of the detent springs differed from 10 to 13 coils. I see a ten coil spring in your picture. I'm not sure of the reason behind the different lengths in my stash. One of my trans is out of a 74 250WR and both springs are 10. As for the others, well they're all mixed up so I can't say what springs came out of what. My initial thought was that HVA increased the spring length on the shifting cam in later years to help a slipping out of gear problem but then I don't know for sure seeing my 74 250WR trans had two of the 10 coil.

To me the ball bearing added to your assembly wouldn't add enough excessive stress to wearout the end of the pin. The other consideration is lack of maintenance (i.e. lack of oil changes or poor quality oil). I once found 30w motor oil in a set of Husky front forks I purchased so you never can tell what folks are going to do.

I can't see the tip of your pin in the photo but keep in mind they're pretty round to begin with. How is it compared to the detent pin that goes under the shifting pawl?

Regarding previously jumping out of gear, were the shifting forks the right ones and were they installed correctly? I'm not sure the trans will even work if a couple of them switched places.

This bike was thrashed before I picked it up. I expected to do a lot of work.

John has bored the cylinder for me and milled the head. The head was pretty hammered by a broken ring.

I don't know if it was jumping out of gear or not but looking at the tranny cogs and comparing the detent sleeve of the drum to that of the index I would say there was an issue. The drum sleeve was rounded, no point at all.

Here is a picture of the shift drum detent and of the actuator detent.

It's easy to see that the shift drum detent is well worn.

Wow. I can understand why the trans wasn't staying in gear. I've never seen one worn like that before.

Motormen, Marty, supplied me with two detent sleeves and springs.
I assembled the tranny and followed crashaholic's advise just setting the cases together without the flywheel.
The 450 ran through the gears smoothly.

Now I can install the flywheel and get the cases together.

sumpins bad wrong with that shifter you better try that again

First tire I have spooned on in 35+ years! Still the pain in the ass I remembered.

I found an original Trelleborg in Vancover, I was worried it might be stiff and cracked but it wasn't.

ive always wondered how tires like that are preserved. tired get hard in a few years. kept away from light for sure

that's a lucky find, well done!

Yes, I was very lucky to find that tire and for $100 shipped!

Steve gave me a Trelleborg for the front. Maybe today i can mount that up.

Still have to press the swing arm bushings in and find a set of shocks. I think stock was 12". I would like to find a stock set of Girlings but cost has been the prohibiting factor.

Finally have the tire mounted on the front rim.

Good job! Bike coming along great!

Crap! Another crossroad. I looked at the swing arm today and it just didn't look right. When I pulled the swing arm bolt I had to drive it out. So I thought it might be rusty. Well, it's not.
I took a square to the bushing flanges and the right one is canted about 10 degrees. It's enough to keep the swing arm bolt from lining up and going through without using a hammer.

I figure the previous owner either hammered out or pressed out the bushings without supporting the swing arm. Looking closely I could see a small dimple on the inside of the swing arm just aft of the pivot point that the bushing presses into.