A A A
Avatar

Please consider registering
Guest

Search

— Forum Scope —






— Match —





— Forum Options —





Minimum search word length is 3 characters - maximum search word length is 84 characters

Register Lost password?
sp_Feed sp_PrintTopic sp_TopicIcon
D1 rear wheel sprocket
Avatar
Munchkin
Bedford
Top Gear User
Club Member
Forum Posts: 2224
Member Since:
July 19, 2012
sp_UserOfflineSmall Offline
1
August 20, 2012 - 2:23 pm
sp_Permalink sp_Print

ok mines knackered where would I get a replacement needed as soon as possible.1957 D1 Bantam.

 

It says in manual its advisable to re new the final  drive sprocket too, so any help would be good. 

 

Need to locate both parts, oh & would I have to renew the chain as well.

 

smile

1951 D1 Bantam. 

2017 CMX 500

 

Avatar
Anderzander
Lancashire
Top Gear User
Site Member
Forum Posts: 3208
Member Since:
October 29, 2011
sp_UserOfflineSmall Offline
2
August 20, 2012 - 3:13 pm
sp_Permalink sp_Print

This is where you'll come unstuck I think..... Or it's time to grasp the bull by the horns?

The rear sprocket is usually riveted to the hub and would need drilling out to mount a replacement. If you are changing one sprocket it makes sense to do all of them.

Avatar
Munchkin
Bedford
Top Gear User
Club Member
Forum Posts: 2224
Member Since:
July 19, 2012
sp_UserOfflineSmall Offline
3
August 20, 2012 - 3:23 pm
sp_Permalink sp_Print

The manual I have states that the sprocket is  held on by 8 bolts and is easily replaceable, anyone know how many teeth are on the front sprocket, and  the length of chain I need for the drive & chain.  If its riveted not looked yet how would I get it sorted.

1951 D1 Bantam. 

2017 CMX 500

 

Avatar
Anderzander
Lancashire
Top Gear User
Site Member
Forum Posts: 3208
Member Since:
October 29, 2011
sp_UserOfflineSmall Offline
4
August 20, 2012 - 3:44 pm
sp_Permalink sp_Print

Just checked your pictures here: ** Please log in to view **

Yours are riveted, so as above they will need drilling out. Pop the wheel out on a bench and centre punch the heads before drilling out.

Avatar
Munchkin
Bedford
Top Gear User
Club Member
Forum Posts: 2224
Member Since:
July 19, 2012
sp_UserOfflineSmall Offline
5
August 20, 2012 - 3:50 pm
sp_Permalink sp_Print

Oh wow cant-look

 

Is there anyone who can do this,not sure if im up to messing around with wheels.  

1951 D1 Bantam. 

2017 CMX 500

 

Avatar
David Dale
Top Gear User
Read Only Access
Forum Posts: 2485
Member Since:
September 30, 2011
sp_UserOfflineSmall Offline
6
August 20, 2012 - 6:38 pm
sp_Permalink sp_Print

http://i770.photobucket.com/albums/xx346/daviddale/20120320_01.jpg

 

http://i770.photobucket.com/albums/xx346/daviddale/20120320_02.jpg

 

Could be one of these, have you counted the teeth on it yet? I have a few new drive sprockets too, but not sure which one?dd.

Avatar
Munchkin
Bedford
Top Gear User
Club Member
Forum Posts: 2224
Member Since:
July 19, 2012
sp_UserOfflineSmall Offline
7
August 20, 2012 - 7:03 pm
sp_Permalink sp_Print

It has 9 rivets on it, the teeth look the same as the bottom pic on the left, if I have to count teeth I will have to check tomos as ive left the bike with someone who is going to do the work.  I will get back to you as soon as poss DD, if you have any for sale as for the inner sprocket wont know till opens up the casing,  what sort of chain do I need as  im going the whole hog not going to do bodge job, not worth it, if a job is to be done then do it properly :D

1951 D1 Bantam. 

2017 CMX 500

 

Avatar
David Dale
Top Gear User
Read Only Access
Forum Posts: 2485
Member Since:
September 30, 2011
sp_UserOfflineSmall Offline
8
August 20, 2012 - 7:46 pm
sp_Permalink sp_Print

Just had a better look at the mist green one with 9 holes, I think it's worn out nearly! I will check out my others and see if I have another, I'm nor sure that I didn't read a posting on forum before the one before this one that you possibly could bolt them on, but only if you got the right size and threaded and headed ones? Anyone else? dd.

Avatar
Munchkin
Bedford
Top Gear User
Club Member
Forum Posts: 2224
Member Since:
July 19, 2012
sp_UserOfflineSmall Offline
9
August 20, 2012 - 7:48 pm
sp_Permalink sp_Print

david dale said
that you possibly could bolt them on, but only if you got the right size and threaded and headed ones? Anyone else? dd.

Not sure I understand this... any help is great wink

1951 D1 Bantam. 

2017 CMX 500

 

Avatar
Paul Davies
'Darkest' North London
Top Gear User
Site Member
Forum Posts: 277
Member Since:
September 28, 2011
sp_UserOfflineSmall Offline
10
August 20, 2012 - 8:01 pm
sp_Permalink sp_Print

I see no reason why you shouldn't bolt one on. The holes as they stand (in the sprocket) are a about 5mm in diameter, so should take an M6 tap OK. Then 9 x M6 bolts (with a dab of threadlock) and a nut & washer on the other side to be extra sure.

'55 D1 Custom (Note: my Avatar is a QR Code which links to my D1's Flickr photo set.)

Avatar
Munchkin
Bedford
Top Gear User
Club Member
Forum Posts: 2224
Member Since:
July 19, 2012
sp_UserOfflineSmall Offline
11
August 20, 2012 - 8:08 pm
sp_Permalink sp_Print

Paul Davies said
I see no reason why you shouldn't bolt one on. The holes as they stand (in the sprocket) are a about 5mm in diameter, so should take an M6 tap OK. Then 9 x M6 bolts (with a dab of threadlock) and a nut & washer on the other side to be extra sure.

Thank you I shall use that suggestion :)

 

So what  kind of chain do I require to replace, length wise & not too expensive but not cheap either

1951 D1 Bantam. 

2017 CMX 500

 

Avatar
Anderzander
Lancashire
Top Gear User
Site Member
Forum Posts: 3208
Member Since:
October 29, 2011
sp_UserOfflineSmall Offline
12
August 20, 2012 - 8:09 pm
sp_Permalink sp_Print

Try the search - there have been a few discussions on chains I think - also all the on-line sellers will list them I expect. 

Avatar
Munchkin
Bedford
Top Gear User
Club Member
Forum Posts: 2224
Member Since:
July 19, 2012
sp_UserOfflineSmall Offline
13
August 20, 2012 - 8:43 pm
sp_Permalink sp_Print

Anderzander said
Try the search - there have been a few discussions on chains I think - also all the on-line sellers will list them I expect. 

Had a look at one thread & completely over my head.Something about a trials & all these numbers dunno

1951 D1 Bantam. 

2017 CMX 500

 

Avatar
baker man
Guest
Guests
14
August 20, 2012 - 9:15 pm
sp_Permalink sp_Print

Hi you need to drop the chain and count how many teeth the rear wheel sprocket has....47 is normal... there are some 9 hole sprockets on e bay at the moment...the rivets holding the old one on will have to be drilled out..but i see no reason why the new one could not be bolted on useing nuts & bolts..useing spring washers & nylock nuts.... if your bike has the 47 teeth sprocket then all you do is count the links in your chain to find the correct lengh...obtainable from any bantam spares supplier!....thumbs-up

Avatar
Munchkin
Bedford
Top Gear User
Club Member
Forum Posts: 2224
Member Since:
July 19, 2012
sp_UserOfflineSmall Offline
15
August 20, 2012 - 9:22 pm
sp_Permalink sp_Print

baker man said
Hi you need to drop the chain and count how many teeth the rear wheel sprocket has....47 is normal... there are some 9 hole sprockets on e bay at the moment...the rivets holding the old one on will have to be drilled out..but i see no reason why the new one could not be bolted on useing nuts & bolts..useing spring washers & nylock nuts.... if your bike has the 47 teeth sprocket then all you do is count the links in your chain to find the correct lengh...obtainable from any bantam spares supplier!....thumbs-up

Thank you, yes ones on ebay are more expensive than the ones ive found online.  I shall pop over tomorrow & count the rivets & links better get my marigolds out lol

1951 D1 Bantam. 

2017 CMX 500

 

Avatar
Bournemouth Bantams
Guest
Guests
16
August 20, 2012 - 11:41 pm
sp_Permalink sp_Print

47 tooth rear is normal, 13,14,15,16 tooth front sprocket are available, chain length will depend upon number of teeth on front sprocket.

Counting the number of links and then buying a chain of the same length is not always a good idea, if the chain is a cheap one and has stretched links may have been removed to give enough adjustment, also as the sprocket wares it reduces in dia so again links may have been removed, you really need to buy a chain that is slightly over length then you can remove the links to the required length when you fit it.

You also need to remember the nut that holds the front sprocket on is a left hand thread and is held in place with a tab washer, you may be able to reuse it but not always.

In order to remove the front sprocket you will also have to remove the timing side outer casing. To do this you will have to remove the stator plate and flywheel, you will require a flywheel puller to do this. when you remove the timing cam don't loose the small, and I mean small woodruff key.

When you put the new chain together the split link closed end must face the direction of rortation or it is likly to come of as you ride the bike.

"H"

    

Avatar
Munchkin
Bedford
Top Gear User
Club Member
Forum Posts: 2224
Member Since:
July 19, 2012
sp_UserOfflineSmall Offline
17
August 21, 2012 - 7:53 am
sp_Permalink sp_Print

Thank you  Howard, but think I shall leave the small sprocket, looks to be too much work & what with lossing a woodruf key id hate to do that & wouldnt know what it was if it hit me in the face.  Im going to purchase another rear sprocket courtesy of Baker man, & I shall count links on chain is Regina a good make, anyone who has purchased chains before id be greatful for your opinions on how they work out in the end, choice is utmost important as I dont want to knacker the bike before ive ridden it.

 

So far ive had put on new levers & clutch cable, horn bulb, not much I know but hey il be finished by the end of the century thumbs-up

Just checked paint work hmm could do with respray but dont know who to go to.  May give that a miss for a couple of years & just enjoy her when shes fit & raring to go.

1951 D1 Bantam. 

2017 CMX 500

 

Avatar
Bournemouth Bantams
Guest
Guests
18
August 21, 2012 - 6:15 pm
sp_Permalink sp_Print

The problem you will have if you don't change the front sprocket is, if there is a significant amount of ware in the old chain an sprocket the new chain will not line up with the old sprocket, they ware into each other, the front sprocket is the one no one changes, I took one of an engine not so long ago and it had 4 of the 15 teeth missing and a couple of the others were only stumps.

By not changing the front one as well you run the risk of damaging the engine cases if the new chain rides over the old worn sprocket or damaging the new chain as the pitch of the new chain will not match the worn pitch of the old front sprocket.

You may get away with it but is not good practice to not change the whole lot.

Howard 

Avatar
Katj
Guest
Guests
19
August 21, 2012 - 6:43 pm
sp_Permalink sp_Print

Munchkin

Replacing chains and sprockets are general maintenance on a 'Chain Drive' bike...if you plan to do any amount of miles that is...so perhaps it would be a good idea to get the person you are getting to do the work to let you watch how it's done

Just a thought but are there any motorcycle maintenance courses run in your area it might be worth looking into

I know it must be daunting but worth the effort... honest

 

Katj

Avatar
Munchkin
Bedford
Top Gear User
Club Member
Forum Posts: 2224
Member Since:
July 19, 2012
sp_UserOfflineSmall Offline
20
August 21, 2012 - 9:23 pm
sp_Permalink sp_Print

Katj said
Munchkin

 

Just a thought but are there any motorcycle maintenance courses run in your area it might be worth looking into

I know it must be daunting but worth the effort... honest

 

Katj

Great idea but most would be the Jap bikes and not the old ones we're all into.  Im having probs trying to locate right chain lol.  I know everyone has given me the right advice but its all these numbers, like looking at an accounts book and not knowing where puts what cant-look

1951 D1 Bantam. 

2017 CMX 500

 

Forum Timezone: Europe/London

Most Users Ever Online: 223

Currently Online: chickensoup, Stoo63, SpacedMarine, Geoffrey25
23 Guest(s)

Currently Browsing this Page:
1 Guest(s)

Top Posters:

Cornish Rooster: 3314

cocorico: 3272

Anderzander: 3208

bart: 3130

Sprung Chicken: 2653

David Dale: 2485

Mags 1: 2356

Piquet: 2323

Munchkin: 2224

Blue Heeler: 2138

Newest Members:

MarcF_1985

Forum Stats:

Groups: 9

Forums: 47

Topics: 12257

Posts: 105617

 

Member Stats:

Guest Posters: 1135

Members: 2889

Moderators: 1

Admins: 2

Administrators: Bantam-Super, JMD

Moderators: Stoo63