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Bike Builds, Rebuilds And Restorations Only / Re: 1975 850T Survivor Project

« Last post by cmice on December 27, 2025, 06:48:23 PM »

Quote from: Antietam Classic Cycle on December 27, 2025, 06:22:08 PM

The clutch plates appear to be those sold by Barnett and that is their usual failure mode.

Makes sense - I remember when Barnett clutches were the thing to have, sadly. Previous owner said the bike was parked because "the clutch froze up and they couldn't get it to release". The friction surfaces and intermediate plate show no sign of being stuck, but the notches cut into the hub I'm sure gave the discs something to hang-up on...or, once in there, they wouldn't come out. Grooves are probably 0.5-1mm deep in spots.

SD-Tec's ordered.

Any tips for replacing the rocker bushing?

General Discussion / Re: Florida ride

« Last post by davethewelder on December 27, 2025, 06:41:07 PM »

Florida has some nice riding, like East of Tampa, Wachula, Bowling Green, mostly in the country around Orange groves and farms and the Phosphate mines.

Bike Builds, Rebuilds And Restorations Only / Re: 1975 850T Survivor Project

« Last post by Antietam Classic Cycle on December 27, 2025, 06:22:08 PM »

The clutch plates appear to be those sold by Barnett and that is their usual failure mode. The sandwiched construction is part of the issue, but inadequate heat-treating seems to be a problem as well. The only plates I use are the "SD-TEC" bonded and riveted plates with matching deep spline hub.

General Discussion / Re: 750 Ambassador head mystery

« Last post by Antietam Classic Cycle on December 27, 2025, 06:17:05 PM »

Quote from: neetones on December 27, 2025, 04:13:25 PM

I continued taking the head apart and found that the valves are very loose in their guides.

Exhaust is looser than intake but both can be freely wiggled around. Looks like I have bronze guides and the exhaust valve is stainless (non-magnetic).

Having a difficult time finding a machine shop that can K-line them. Any suggestions? The bike doesn't get ridden much so I'm not sure how much I want to shell out, but I'd like it to run properly and reliably.

video of valve play: https://photos.app.goo.gl/jfE961oZUvhaHdoN6

Do you have a micrometer or even a dial caliper to measure the valve stems in the area that slides through the guides? The valves might still be usable, but those guides are knackered. Guides cost $14 ea. and my local machine shop charges $280/pr. to clean and media blast the heads, replace the guides and recut the seats.

General Discussion / Re: New V7 Sport

« Last post by Dr. Enzo Toma on December 27, 2025, 05:44:11 PM »

At the trim level at least, there's the Transcontinental. An incredible machine, but I struggled to get it upright off the side stand on a slope, even after turning the bars, so not something for my garage.

General Discussion / Re: Monday was a Wild Hair Day.....

« Last post by guzzisteve on December 27, 2025, 04:14:38 PM »

That's a nice bike!!

General Discussion / Re: 750 Ambassador head mystery

« Last post by neetones on December 27, 2025, 04:13:25 PM »

I continued taking the head apart and found that the valves are very loose in their guides.

Exhaust is looser than intake but both can be freely wiggled around. Looks like I have bronze guides and the exhaust valve is stainless (non-magnetic).

Having a difficult time finding a machine shop that can K-line them. Any suggestions? The bike doesn't get ridden much so I'm not sure how much I want to shell out, but I'd like it to run properly and reliably.

video of valve play: https://photos.app.goo.gl/jfE961oZUvhaHdoN6