For Kel: B Grades bucket build

**Grumph** · 6th January 2012, 19:48

Originally Posted by jasonu

As the Aprilia sprocket is dished and therefore offset I would cut down the original then remove the center from (say) a 50t so when placed on top of the Aprilia center they overlap. Then work out how much more offset you need, make the appropriate spacers then drill and bolt them together. That way you could do the same with other sized rears and use the same Aprilia center part as the mount.

Personally, I'd just make up a sprocket carrier to attatch where the original sprocket does, and which is drilled to accept a flat readily available sprocket. Preferably a cheap, readily available sprocket...Get the thicknesses right and the offset is correct.

this is similar to working with the original Dymags...they came with machined large holes in the hubs and a ring of tapped holes on each side. You had to make up bearing and sprocket carriers to suit. Non machinists need not puchase.

**cotswold** · 10th January 2012, 13:51

Just had a 420 front sprocket arrive in the mail, it fits the spline and is the same pitch as the Aprilia rear, just need to get it skimmed to 5mm and I will have drive.
Need to find one with 11 teeth now and I'll be happy.

**F5 Dave** · 10th January 2012, 14:11

just make sure you give the chap a section of 415 chain to match it to. Pretty sure it is less than 5mm for clearance. Also will need a bevel like std, flat edge will cause issues & derailment.

**cotswold** · 11th January 2012, 02:05

Originally Posted by F5 Dave

just make sure you give the chap a section of 415 chain to match it to. Pretty sure it is less than 5mm for clearance. Also will need a bevel like std, flat edge will cause issues & derailment.

Thanks for that.

**cotswold** · 13th January 2012, 11:04

Originally Posted by F5 Dave

Queer wheel sizes mean slicks are a squeeze. on the rear & no go on the 16" front.

I just plonked a 17" RS honda wheel in the standard forks and it all but fits, need to either skim a smidgen off the top of the disc or slot the brake caliper a tiny wee bit. will need to find bearings to suit or knock up a spindle. Photo to follow.

**F5 Dave** · 13th January 2012, 11:19

Hmm, sounds like it would be best to send me the RS wheel & in return I'll tell you the best modification. Then you just need to find another wheel & you're away. Send me a spare rear as well please.

**cotswold** · 13th January 2012, 13:45

Originally Posted by F5 Dave

Hmm, sounds like it would be best to send me the RS wheel & in return I'll tell you the best modification. Then you just need to find another wheel & you're away. Send me a spare rear as well please.

Very tempting offer but I think I'll struggle through.
Toooo slow on the rear Rick has his name on that one

**F5 Dave** · 13th January 2012, 13:47

ok how about this one? I have a straight Honda disc that is RS pattern & offset & about 10-20mm smaller dia. Swap you for the RS one? If the RS one is straight.

**Buckets4Me** · 13th January 2012, 18:04

Originally Posted by cotswold

Very tempting offer but I think I'll struggle through.
Toooo slow on the rear Rick has his name on that one

I may have a disk that fits for you will just have to go and check it
can drop it off saturday or sunday if you want to try it

**husaberg** · 22nd January 2012, 18:17

OK the worlds Biggest sprocket catalog

It is great because it gives the spline measurements.
As well as the bolt hole dimensions

http://www.jtsprockets.com/catalogue/

To slim done a Steel sprocket heat to cherry red alloy to cool down slowly
then attack with the lathe while its in its soft annealed state.

Reheat to cherry red and then plunge into the dirtiest carbon incrusted oil you have the blacker the better. If you were a belts and braces type, an engineer will tell you to reheat to 200-300 degrees or so for a period of time like a couple of hours then cool slowly to re-temper. But as is it will be bucket ready.

RMX 50 looks the same, other than offset.
There are plenty with .5 mm narower splines ie 20 16 3.5mm that could work with a few stokes of the file and are more common styles carried by suppliers.

Dave you could just do an adapter plate for a RGV250 or similar Disk if you want a flatter offset front disk.
They are here or you could make your own. M5C

http://home.exetel.com.au/bkm/cast-w...ther-bikes.htm

**cotswold** · 15th February 2012, 20:28

[QUOTE=husaberg;1130240506]OK the worlds Biggest sprocket catalog

It is great because it gives the spline measurements.
As well as the bolt hole dimensions

http://www.jtsprockets.com/catalogue/

RMX 50 looks the same, other than offset.
There are plenty with .5 mm narower splines ie 20 16 3.5mm that could work with a few stokes of the file and are more common styles carried by suppliers.

Thanks for that, I have had one turned down and it looks ok but not sure it was re-hardened.
The engine is in the frame good and tight so on to the wheel fitment.

**Rick 52** · 15th February 2012, 21:09

That's looks great ! Keep up the good work ..so will you take up Johns offer for Te Puke?

**Henk** · 15th February 2012, 21:13

Tim is too soft to race at Te Puke, so he is going to come down bike less and wave flags as an excuse to get horribly drunk and sand bag the hop scotch contest on Saturday night.

**cotswold** · 16th February 2012, 04:18

Originally Posted by Rick 52

That's looks great ! Keep up the good work ..so will you take up Johns offer for Te Puke?

Don't think so, trying to save my money so I get mine finished, spending too much for her indoors liking at the moment.

**cotswold** · 16th February 2012, 04:24

Originally Posted by Henk

Tim is too soft to race at Te Puke, so he is going to come down bike less and wave flags as an excuse to get horribly drunk and sand bag the hop scotch contest on Saturday night.

Mmm hop scotch sounds harmless, I'll leave the plaster-cast kit at home