What application crank pulley have you used...

[Guest]

The pulleys are all readily available on line. One of the places is here:
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I got mine at another site, but this one looks like they can cover almost any need.

[admin]

Too bad they don't offer a three groove pulley.

[Guest]

Of course you could try this one.
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My point is that there are tons of places on line where you can find any type pulley you might want.

easy way to find them is just Google "automotive pulleys"

[admin]

It's amazing how difficult it is to find a 3 groove 4" diameter pulley to fit our Wings. They are absolutely scarce. I have spent hours and hours searching and came up empty handed.

[dan filipi]

I've spent many hours myself looking, the combination just isnt out there.

From what I've found, it's the crank bolt diameter that's the problem, the shim forward needed can be done with stock sleeves.
Too bad there isnt enough of a need for the pulley for someone to build them. I have a machinist that made mine but I'd have to order 10 for him to drop the price to $70-$80 each. Pretty hard to sell it for more than that cost.

[admin]

I had one U.S. machinist who was going to machine a 4" 3 groove aluminum pulley, case hardened for $100. I should have taken orders because I have since lost his address and I have been kicking myself ever since.

[TNroadrider]

OK here's a suggestion, print off a copy of my sketch for the 3 groove 4 inch pulley, (I'll draw up a new one for a better post if necessary) take it to a local high school or trade school machine shop teacher, you can usually have the item made for cost of materials and a donation to the class fund. If you supply the material you only make the donation and you get a pulley and the joy of helping local education needs.

The teacher (if he or she is a good one) will keep check on the project to make sure that the part is made correctly so you get a good part and someone gets a chance to make something kinda rare in todays machining methods. They will usually only allow their best students to work on a project of this type.

As for buying one that is a bolt up to our bikes you can pretty much count that out since the mounting shoulder is where the key factor is, as most pulleys don't have this type of shoulder on them.

Just a thought, I've used this method in electronic repair and some shop projects for my factory that were mainly time consuming projects for my guys when I needed them elsewhere on other jobs. If there is enough interest I will redo my sketch into print form for posting so it will be easier to read.

[Guest]

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31/64th and 1/2" almost identical, and close enough, No?

is 1/32nd to much to tolerate?

[TNroadrider]

Jim, the 31/64 is a slip fit for the METRIC bolt which is used to hold the pulley. When I was setting up the pulley for machining I allowed just enough clearance for the bolt. Since the bolt is acting as the 'internal material' which was removed from the pulley so to speak you don't want alot of tolerance but you could possibly get away with drilling to 1/2 inch. Remember unless your using an undersized drill and reaming to fit most drill bits will wobble and that 1/2 inch hole may be alittle oversize.

I used to work in a machine shop on critical fit items guess old habits are hard to break :lol:, I'm sure your pulley drilled out to 1/2 inch would do fine.

[Guest]

I understand.

I was looking at the pullys avalible at the farm supply stores, 1/2" is easy to find, as is 3/8, 5/8 and so on.
Maybe a 3/8 drilled to 31/64th?

Jim

[TNroadrider]

Also consider Jim that those pulleys are for a V belt, the reason I choose the 3 groove Micro serpentine belt was due to its thin small size which allows it to bend around the smaller alternator pulley better and the fact that the 3 groove channels allow for better gripping power so the belt does not need to be as tight as the standard V belt thus exerting less force on the crankshaft bearings.

Hope all this helps in making your decision on your conversion.

[Guest]

Where can I get about 3 of this type belt, The 3 groove?

Jim

[TNroadrider]

These belts are avaiable from CarQuest, Napa and AutoZone. I purchased 2 belts to fit my application, since I am using a 4 inch crank pulley and a 2 1/4 inch alternator pulley I got the Gates K030323 Micro V belt. You can check with your local part store to see the different lengths they have avaiable or can order, if going on a long trip I would put one of whichever type in a saddlebag just in case.

[admin]

Those 3 groove micro V belts are quite durable. I've spun my 1200 up to 8000 RPM on many occasions over the course of 5 years and in that time the alternator belt never needed adjustment or attention and it's still going strong and looks like new. I think a lot of that is due to the fact that the 50 amp alternator is only asked to output 35 amps max so there is only a small load placed on the belt.

[SIR tricky]

After you have finished you conversion and have the pulley's inplace. take a piece of string and wrap around both pulleys mark and measure, that will give you app rox size to start. about 29.5 " was the one I used.... if I remember correctly