Rear Sprocket Lightening

[dapper]

Anyone had a go at this? Difficult to do? Is the whole sprocket hardened? Is it worth it and does it really have any benefits?

[drunkmunkey6969]

8th picture down, at bottom of page: http://scooterotica.org/forum/viewtopic ... 0&start=50

[dapper]

Providing one is careful and makes accurate measurements, can it be done just with a pedestal drill, or does it have to be done in a machine shop? And what was the weight comparison pre and post drilling?

[oldbiker]

how much weight are you going to save? Just don`t have any mars bars for breakfast

If you do want to do the drilling business it can be done on a pedestal drill provided you mount the sprocket in a deviding head.

Or can markout and drill acurately.

Use a slow drilling speed and plenty of drilling preasure with a coolent (gear steel can be like stainless and harden once it is over heated)

other options are a vertical milling machine with a deviding head or a cnc/nc vertical milling machine.

personaly I would skip the mars bars

[drunkmunkey6969]

how much weight are you going to save? Just don`t have any mars bars for breakfast

Its not about gross weight, its about rotating mass....you dont lighten a flywheel by 500g for no reason.

[chris2470]

Has anybody tried one of these:
http://scootrs.com/moreinfo.cfm?Product_ID=6
They are only £16.00 form UK stock and also hardened so you can run some bearings in it. At this price they seem almost too good to be true so has anybody tried one?

[DMC]

does any one in the uk supply these as well?

[YAMLAM]

just got one of each,only fitted them wednesday and havent finished building the rest yet.will let you know,hopefully finish sat/sunday.