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In my humble opinion those splines are still in very good shape. There are no shiny wear marks anywhere and the tooth profile on the splines is like new. As a test, fit the connecting sleeve back over them and feel for play by wiggling it back and forth. I'm confident that there will be virtually no play. You can then perform the same test on the gearbox output splines and I don't think you'll see much wear there either. If there is any wear it is likely to be on the connecting sleeve. I think you should just replace the big main oil seal and keep on using the final drive without stripping it further. Don't mess with something that isn't broken. Many Tonti-framed Guzzis have done a lot more mileage than yours without the need to replace the final drive pinion shaft.RegardsThomas
In my humble opinion those splines are still in very good shape.
Check the threads in the part which the crown wheel bolts to because when the threads were partially stripped in the hole where the bolt had come out of (the one which rattled around and tried to get out, leaving a patina of marks very similar to those in your photo). Not only that, a couple of others which were merely loose also had weak threads which could not take the torque of re tightening. I eventually had the whole lot helicoiled. The high tensile bolts are expensive and I don't want you to damage them by trying to tighten them into damaged threads and then have to go and buy a load more as I did.You said that some of the bolts were only hand tight? Check those ones particularly, run a cheap bolt into it and see if it comes back out in perfect condition before you try one of the expensive ones.
I just want to warn you about buying a new drive from Stein Dinse in Germany.They are not original Guzzi drives
Here's what happens inside.....fun and games...and far, far away from good...Screws that hold the crownwheel were completely free, I unscrew them with my hand..one has broken sometime, but not while I am the owner, so the case hase some damage.Remains of the bolt head...And, I must say...that didn't happend to me, because if did, surely would have heard that...so, this is inside for 7 years now....and 100.000 km...I think I'm a lucky guy...
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