75 Mark III refurb/mod project

grandpaul · Jan 18, 2010

Never mind.

Life is too short for this nonsense.

Back to work!

Jeandr · Jan 18, 2010

The lifeline of a board or blog or TV, radio, media of any kind, is contens and build threads do provide that and just as muting a commercial on TV, if build threads pose a problem, just don't read them.

Jean

Keith1069 · Jan 19, 2010

I've said my peace and exposed the general shoddiness of this member, to my satisfaction as well as those members that have been kind enough to PM me in support of this.

Get a life SNS and off your high horse. Notice you don't give much away in your profile!!

grandpaul · Jan 20, 2010

Got the head back from the machinist today; no good reason why they took as long as they did, but they have been swamped with high-paying oilfield work lately.

As the client desires a more "patina'ed" finish, no bead blasting on the cast parts, and no polishing of the engine covers on this build; just a good, thorough hot soak/wash.

The Kibblewhite racing springs & valves are quite nice-

Nortasaki · Jan 20, 2010

grandpaul said:
Never mind.

Life is too short for this nonsense.

Back to work!

Thumbs up to you GP, I'll be in your nieghborhood 4-12 thru 4-19 visiting my step daughter and son in-law perhaps I can pay you a visit. Keep up the great work and post often, I for one learn a great deal from you. :wink:

grandpaul · Jan 21, 2010

JE Pistons and "gapless" rings installed-

Radiused tappets to mate with the Megacycle cam-

I still remember the first top end job I ever did on a Norton. Ever forget to lockwire the cam followers in place before you lower the jugs onto the block? It's a nightmare to wire them in place with the pistons at the top of thier stroke and the cylinders blocked up with custom-fit 1x4 to leave room to safety wire!

Anyway, I learned my lesson way back then...

Just need to wash off all the fasteners and nip it all up-

grandpaul · Feb 3, 2010

Just an update on this project, as it would appear that it's been "waiting" for a while:

1. Wheels should arrive today

2. Revised design of swingarm to allow full clearance for rear disc brake caliper mount to adjust all the way forward is in-work. Final design will be built next week.

3. Engine is complete and ready for installation in the frame, as soon as the swingarm is mounted.

4. Rebuilt forks will be on the bike next week.

So, starting next week, there should be steady activity right up to completion. Target date to deliver the bike to the West coast is late April, so there's plenty of time go step-by-step

grandpaul · Feb 3, 2010

Wheels just in from Buchanan's (no, it's not a copy of the photo from the '74, they are identical)

grandpaul · Feb 4, 2010

Cleaned up the rear hub components and re-packed the bearings & speedo drive-

Installed rear hub & brake disc, mock-up shot just for grins-

rond944 · Feb 4, 2010

Paul , are those the 10.5 to one JE's from Kenny ? If so please let us know how they work . I think I've got Leo talked into milling the domes down on mine a bit . I'll feel more comfortable if we hold it down to 10 to one .

Ron

grandpaul · Feb 4, 2010

Yep, those are the 880s.

grandpaul · Feb 18, 2010

Frame mods are done; they do not affect a return to original configuration nor do they disturb any standard parts fitting. Just two simple tabs welded up against the webbing, with holes for the monoshock's top mount bolt-

grandpaul · Feb 18, 2010

Swingarm is also done, this is the "Plan B" model, my second iteration. This time I boxed out the front section and eliminated the left side upper leg so I can retain the stock chain guard. As it is, it's still over-designed for the base mounted rising rate linkage that forms the bottom monoshock mount-

grandpaul · Feb 18, 2010

One more shot of the swingarm-

Sanded and touch-up painted the frame, stripped and painted the swingarm-

This day has been a long time coming!

grandpaul · Feb 22, 2010

I've had to go to an alternate design in the rising-rate linkage in order for it to co-exist with the box-section front assemblage on the new swingarm. On my previous design using tubular uprights on each side, there was a space in the center where the bottom hinge point of the linkage and tail end of the rotating cradle connection could "slot" into; now, that's gone.

No big deal, it's all worked out. Just going to take an extra day to fabricate the new link plates, test fit them, then paint and install.

grandpaul · Mar 3, 2010

Well, it took more than an extra day to get it done, but here's the new setup. Just waiting on the forks to get back from overhaul to set up the rolling chassis and verify range of motion before pulling it back apart for final spacer & hardware fitment.

Coco · Mar 3, 2010

Cool.

swooshdave · Mar 3, 2010

Maybe I can't keep them straight but what's the difference between the two monoshock projects you have going on?

grandpaul · Mar 3, 2010

This one is a Mark III which has a square section main web front section. From there, I've built up the box vertically, and attached only the front and right leg of the second swingarm instead of using the left leg and chopping into it to clear the chain. This allows me to retain the OEM chain guard. Other than that, they are essentially the same with a bit different geometry on the rising rate linkage..

grandpaul · Mar 4, 2010

I still need to pull the rear end loose and replace all the temporary hardware with the grade 8 stuff, paint all the rising rate linkage bits & spacers, install the
swingarm spindle set pins, and the isolastic rubber booties, but I just had to assemble the rolling chassis temporarily after getting the forks back from overhaul.

Rear wheel first-

Front forks, after cleaning up and re-painting the lower sections-

Then the front wheel-

Note: the photo with both wheels shows the bike lift still had the wheel off the ground, that's the reason for the "headed downhill" appearance;
the static suspension settings will see the bike level & true once everything is nipped up right & proper.