"Test Mule" '74 850 Monoshock build

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I need to cut down the stacks and find or make some manifold adapters. For right now, it will be a "back burner" project.

I saw them at a local bike shop when I stopped in to buy some iner tubes and saw them hanging on the wall; the guy let me take 'em to see if they'll work, if so, we'll make a deal on the brace of four (the other pair will be for sale once I sort them out and prove them). Uh-oh, here we go again...

..eh, it's a "test mule", remember?
 
Very interesting carbs, what are they from? size? what do the flanges look like? Shouldn't be too hard to make a manifold :wink:

Jean
 
I'm not sure what they are from, but I'm guessing it's a litre-bike (for sure it's a UJM). 35mm spigot, the rubber adapter was one of mine from a set of wierd outward-bending adapters, maybe for single carb Triumph to turn it into a 2-carb setup.

...as if we didn't have better things to do...
 
splatt said:
grandpaul said:
and I'm using a "thick" paper base gasket
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Thats cleaver
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Norton eliminated the base gasket for a while on the 750's because they would disintegrate under the movement of the cylinders on the crankcase. This allowed the cylinders to "rock" and resulted in many breaking out the front of the crankcases. I have seen this more on Atlas and early 750 Commandos. The 850 through bolts on the cylinders seemed to eliminate the tendency to move on the cases.

I still do not use a gasket on 750's or 850's, preferring anaerobic sealant here to help "glue" the cylinder and cases. A thick base gasket is probably fine on an 850, but would not use one on a 750.

If you want to lower compression, use a compression plate with sealant on either side. My $0.02.
 
Got the wheel bearings installed, front forks & calipers installed, and loosely assembled the brake rotors (need the proper high-tensile bolts) -
 
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There's TWO of those discs. (yep, 12 pots).

Yeah, it's overdone, but it is what it is, a complete, modern front end.

With AM26 100/90 x 18 front & rear, it should all come together nicely. They'll be here, and on both the 850s, by about mid-week.
 
If ever there was a case for bracing the headstock, that would be it ;)

Very Butch!
 
32mm Amals), and 30mm outlet, perfect match on the head.

Installed the carbs, 3-1/2 slide cutaways, 310 mains, needles all the way down (to start with).

Installed clip-ons, clutch lever, tranny cover, oil tank, kickstarter, throttle, (rear wheel still missing some bits), and tossed on the bodywork -

Clutch is not quite 2-finger pull, but easier than my Blue bike (still need to re-stack that clutch); throttle snaps cleanly, and the engine has TONS of compression!
 
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Got a bunch of little stuff done today and finally made my finish punchlist.

Coil brackets & coils with spark plug wires-

Taylor head steady-

This area is almost done...
 
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Z-plates & exhaust mounting bracket assemblies-

Used a Triumph meter mount & rubber cup, inserted into a rubber bushing in the Suzuki keyhole mounting ring, perfect fit-

Also made a pair of front wheel spacers to get everything aligned and snug. There is no more than 1/8" clearance between the spokes and the calipers!
 
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A bunch more little stuff.

Found a nice 4-pot rear brake caliper (300% more than necessary, I know); just need to weld a tab onto the OEM caliper bracket-

Sparx ignition installed-

Timing cover nipped up-
 
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Tranny cover installed (did that a couple days ago)-

Timig side basically done-

Windy's front steady nice and snug-
 
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A few minutes after dinner, UPS knocked on the door-

Avon Roadrider AM26 100/90x18 (2 for me, 2 for my client's bike)
 
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Just toying with the rear brake idea, it has some sort of modulator mechanism I'm wondering about, appears to have an adjustment of some sort.

The proper choke cable abutments and carb tops are on the shelf, to be installed later.
 
nortonspeed said:
Are you mounting an 180hp R1 engine into this bike :?: Sorry GP, IMHO these huge double discs look slightly overdone :shock: But love the rims :!:
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The "huge" front drum on the Norton, pictured in your avatar is relatively the same size in diameter as GP's disc set. Mind you, GP's discs would probably a lot more grabby than your drum.
 
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