40 mm belt clutch stack pack???

Have not yet tried to assemble Maney 40mm belt drive so wondering if its extra width allows stacking more plates?

Hi Steve, no the 40mm and 30mm are the same , regarding clutch packing, the drum is the same inside, and outside too, only difference are the belt width , and front pulley .

Ok marinatlas thanks for setting me straight. Hope the fancy thin rim 850 plates are up to the task.

+ 1 as marinatlas, as I have both Maney products in both bikes , 30 mm in the road bike and 40 mm in the race bike , clutch basket are identical,just make sure you have the correct pressure plate, as I discovered in my race bike, it was an older style thicker plate and set the diaphragm slightly convex and allowed for a bit of slippage off the line or at max revs, skimmed the plate to achieve the diaphragm slightly concave. Running bronze plates in both .
Regards Mike

I want to ask another question reference the 40mm belt drive kit. This weekend the Norvil 30mm belt on my '74 Commando failed. This is an 880 motor (no, not Dreer), with mega-cycle cam, flat slide carbs, about 13,600 miles on this 30mm kit. Not a race bike. Upon disassembly I found the teeth on the clutch basket "notched" and slightly rounded.

I'm wondering if I should replace with a 40mm belt. Is there room for the wider (40mm versus 30mm) front pulley in the standard primary case with the alternator? Do I have to use smaller (less thick) spacers on the alternator mounting studs?

Tom Sanders
Winter Springs, FL

I've never been able to fit the stock alternator with the 40 mm wide belt drive kits I've used (Bob Newby and Norman White drives), and I'm pretty sure you can't do it with Steve's drive either. The output shaft just isn't long enough.

Ken

Ken,
Thanks for the rapid reply. I was looking at the front pulley and alternator last night. I couldn't see how another 10mm was going to fit in there. I'll simply have to replace the 30mm parts.

According to Steve, the 40mm belt runs with the stock alternator in an 850 MK3 but not the earlier bikes.

Hungry J0e said:

According to Steve, the 40mm belt runs with the stock alternator in an 850 MK3 but not the earlier bikes.

Click to expand...

Could be. The alternator mount is quite different in the MK3, and it is spaced further out on the longer mainshaft. I've never tried a belt in the MK3 because it has to run in oil (unless you ditch the e-start and sprag clutch), and that didn't seem like such a great idea. MIght be OK with a poly belt, but I never tried that.

Ken

Alls I know is Maney 40 mm belt allows clearance for primary cover to seal with alternator installed on a Combat.

sargehopp said:

I want to ask another question reference the 40mm belt drive kit. This weekend the Norvil 30mm belt on my '74 Commando failed. This is an 880 motor (no, not Dreer), with mega-cycle cam, flat slide carbs, about 13,600 miles on this 30mm kit. Not a race bike. Upon disassembly I found the teeth on the clutch basket "notched" and slightly rounded.

I'm wondering if I should replace with a 40mm belt. Is there room for the wider (40mm versus 30mm) front pulley in the standard primary case with the alternator? Do I have to use smaller (less thick) spacers on the alternator mounting studs?

Tom Sanders
Winter Springs, FL

Click to expand...

Pics Tom, or it didn't happen....
Curious to see.

I found the teeth on the clutch basket "notched" and slightly rounded.

Click to expand...

Hmm, Peel history lesions involved three 30 mm belts, all able to out drag-sprint powerful moderns up to 90 mph Because Moderns Would Wheelie Too Easy and had to back off, so unless your Norton tested-scared your ability not to let Commando run flat out from under you, you ARE NOT over powering any type of 30 mm belt capacity. So let me count the ways you & Peel can ruin belts to put in pipe to smoke.

Peel lost 1st belt in about a season 3000 miles of hunting down any and every hot snot sport rider to find Peels power pecking order >>> which required over 7000 rpm in 1st and 2nd in 10-45 mph marked sections, on easy slow ride back home, belt ending up in & around Alternator, Because the dry sleeve bushes wallowed out to allow clutch wobble that walked belt off tract. Fixed that let down by adding a 3rd sleeve bush all oil grooved to allow Dexon II to get inside during intervals of 4th gear operation. Basket never wobbled again.

Peel 2nd belt only lasted about another 1500 miles BECAUSE I GOT BORED & STUPID and made decorative but functional air vents which allowed some fine road grit in that abraded the belt edges on front pulley plates so began to unravel with long fibers and rubber dust inside **AND** wore off the black anodized layer and began to round the pulley teeth edges with some mild linear notching evidence seem but I found in time to replace belt before failure and caused me to add *filter* material behind air vent. No more belt edge grinding paste evidence.

With upgraded bushes and more sealed primary Peel had no more belt related let downs from walking off track or abrading belt or teeth but d/t the routine frequent mis use of front floating wrist straing sprinting between all my harsh slow downs before blinds - crank nut came off and made series of pencil point holes plus a whole pencil finger tip size hole in belt that also chipped out real notches in alu teeth, lasted fine that way for rest of her hard life both as a sports bike spanker and long distance Heavy Cargo hauler. Doug Townsend in Oregon now has Peel old 30 mm POS drive installed in some other Norton as thot too ugly for Son of Sir Eddie land speed use.

Point being a 40 mm belt would not of prevented any of past Peels let downs so may not yours either but try 40 mm on open vented primary and let us know how long it lasts. Also if installing a bigger engine for its extra power use let us know what gear/rpm the front comes up or your ride reflex before throttle snaps not to be left on tarmac watching bike crash w/o you. Point being I do not hear of anyone else with Peels dangerous power response cautions so doubt any one of us w/o 920cc race use is over powering a 30 mm belt nor even testing to Peel level of life time memories of abuse. Steve Maney told me 40 mm needed for over 80 hp/7200+ racer use for his apparently un-informed sense of belt-teeth size.

Dead and living Norton drag racers told me AMC boxes vomit apart on tract as hp approaches 100 hp clutch drops. Point being - which Peel also tested by loosing teeth off 3rd gear out dragging a 900 Ducati Monster but not over working her holey & notched 30 mm belt priamary. Point being AMC gearbox is rather weaker limit than 30 mm belts so might reconsider your thoughts on what is limiting yours.