Chuck

Thanks. I found it apart, unloved, etc. Cheap. (Guzzi content) I'd never seen one before, much less ridden one. I'd heard of their reputation, though, and thought it would be a good bike to leave out by the ocean to rust and corrode instead of the Mighty Scura. I bonded with it chasing Scud up and down Polomar mountain last fall. After a change to Continental Sport Attack 3s this trip out.. youza. It's a much better bike than I am a rider. Just the same, I'd rather have the Monza out in the canyons.. but I'd be back to worrying about rust and corrosion..

I could give you some pix of the last three weeks hooning around in the SoCal mountains on the.. uh.. notScura.. ferinstance: 2017-12-28_03-25-22 by Charles Stottlemyer, on Flickr 2018-01-01_01-05-36 by Charles Stottlemyer, on Flickr

Most excellent..

Absolutely. The spring calculator says the ID will be less than 16mm at 39 degrees rotation.

I assume you've never been over here? It's a BIG place. It is. After doing around 3 trips to the west coast over the years my wife and I had our honeymoon in the states a couple of years ago and travelled from LA to New York and back by plane. Yep just jump on the plane and 4 hours later your on the opposite coast. Then add the airport fiascos at both ends and, oh yeah, the timezone shifts and bugger we've lost 2 full days there and back. Doesnt seem too big until you go from one side to the other. Ciao You must have a faster plane than we take. It's 4 hours from Indiana to LA non stop.

It sure would be fun to have a look at an early preselector and pawl spring.. I didn't realize they never broke.

Just be aware that is very easy to over fill if you drain and measure. It's so tenacious that it all doesn't drain out..

As they say.. "Yer a legend.."

Attaboy, Marty.. Going to tell us what it was?

As I understand it, the stock cam is very similar to the smaller Megacycle cam.

I tested the new design with 10 degrees extra preload, and the hooked end barely on the lever for a quarter million shifts.. At any rate, I'm convinced it won't break in service. My concern was how it would work in a bike. So far, Scud thinks it might be better. Footgoose mentioned a shifting problem with his coil spring mod. Again, so far.. the new spring has been without issue.

That's a really strange one. Even if he did short the positive wire, it should be dead unless the horn relay is stuck or horn button shorted, etc. Marty has beer. He'll get it sorted.

And.. some Caig DeOxit in relay bases, connections, etc.

"The shifting just seems more crisp and neutral is very easy to find." Yay.

You can bleme me for going away from the extension spring. The original idea was to build a "kit" that could be installed by the average home mechanic. That would have included a custom made pedestal, the spring, a drill, tap, counterbore, o ring, a very accurate template to drill the preselector, and hardware to put it all together. By this time, it is getting expensive.. and.. not all home mechanics have a drill press, much less a milling machine which would have been preferable. When it became obvious that the original spring was poorly designed, a proper spring design is the simple and viable IMHO solution. Of course, you can do your own extension spring mod.. Footgoose has done one, and there are pictures of his in this thread.

Nice job on the stand,Marty. HNY to all!

May very well need rollerized.

No need to send me any money, Scud. I was just doing this as a partial payback for all I've learned here. Some of it useful.. :) Actually, its been fun..the sort of thing I used to do back in another lifetime as an engineering modelmaker.

I "liked" the way the preselector worked with the new spring, but didn't want to say anything.

"I didn't miss any shifts... " Alrighty, now..

Docc.. pinch bolts are very lightly loaded.. unless you are one Pete's "shaved apes." To prove it to yourself, put in an axle bolt and just snug up the pinch bolts. Now try to turn the axle bolt.

Great news, Scud! Ilove it when a plan comes together. More field testing needs to be done, but I'm cautiously optimistic, too. Here are the reasons for the design of the new spring. (!) The reason for the breakage on the end. The Guzzi spring radius was stock thickness. Standard minimum bend radius is 1 1/2 times stock thickness. If you scroll back to the picture of the test fixture where I tested the new spring, I shimmed it out so only the end of the hook was on the pawl.. putting more torque on that hook. A more than worst case scenario. I also lengthened the short arm .1" to get it away from the radius where Scud shows the wear. I'm pretty sure that is the reason for the occasional shift lever sticking down on a down shift. (2) Breaking at the coil is a no brainer. Guzzi is driving the spring 39 degrees. The spring calculator says safe travel is 30.48 degrees from memory. The new spring is well within safe travel. You can see the effect of over driving the spring in the picture Scud posted. By this time, there is *no* spring pressure on the upshift, and the eccentric adjustment controls how well it shifts. Off to breakfast. Carry on, Mr. Scudder.

I'd put my wager on Mr. Roper. We have proof positive that they don't know how to design a spring..

That bike was from the Larry Klein (RIP) auction a month or so ago. Somebody's just flipping it to try to make a few bucks for whatever reason..

They are the standard thing for leaking Lycoming and Continental cheesy stamped valve covers. They are just snugged up with a screwdriver, no torque wrench needed or wanted.