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D1 Drive Chains and Sprockets
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SuperSun64
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July 31, 2020 - 1:11 pm
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Hello all,

I have read as many posts on the forum as possible and am nearing a decission. 

I need to change front and rear sprockets and the chain.

Firstly as I don't have a puller I decided to try and remove the front cog with the engine on the bench but in one piece. I had read a post that suggested that tab washer could be manipulated in this position however mine had been used more than once and wouldnt budge. So I hate to say it however I took a hacksaw to the tab and off it came. With a bit of manipulation the nut moved and now the 15 tooth cog is on the bench. 

So to replacement sprockets and chains. 

Am I correct that the 90-6090A sprocket will take a 420 chain with the 90-6090 taking a 415 chain. I apologise for this question as there have been so many discussions about this subject previously on the forum. 

My thinking is that I get a 14 tooth front, 47 tooth rear both able to take a 420 chain. Any sourcing recommendations. Rex Caunt has been mentioned in previous posts however he doesnt seem to have rear sprockets and chains at the mo. 

Also I see so many price variations in sprockets. Realising that you get what you pay for are the cheaper versions any good?

Kindest regards

Andrew

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cocorico
Central France
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July 31, 2020 - 6:34 pm
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Look in FAQs! The chain / sprocket / what fits and doesn't has been discussed many times before. If you use 'standard'chain, use 'standard sprockets, 415 with 415 and 420 with 420. Don't mix them!

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Number6
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July 31, 2020 - 7:39 pm
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http://livinginthepast-audioweb.co.uk/imagex/misc/whathesaid.gif

 

Have a look at this:

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Ninth row down, click column 1/2" x 3/16", first number in list is '415'

 

You can get all parts from Bournemouth Bantams, if he's got them in. The issue is that the chain's rollers' diameter should correctly fit the scallops in the sprockets (which they do, I've checked and measured). laugh

Just IMO as regards sprockets ratio, do not mess about with the standard ratio, keep the front as 15T & the rear as 47T, guess how I know; I tried a 16T g/box sprocket on my D3, produced a massive huge step between 2nd & 3rd gears and it didn't want to pull top in a strong headwind. Might do 55 on the flat tho. Conversely, going smaller (14T) means running out of gear shifts early and it won't make the same top speed as standard.

Mike H --

Murphy's 4th law of motion states that any small object that is accidentally dropped will immediately hide itself under a larger object.

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SuperSun64
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August 1, 2020 - 6:59 am
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Thanks both for the advice. I’ll have a look at FAQs and stick to what’s on there already in terms of teeth.

Kindest regards

Andrew

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stubaker58
Sunny Felixstowe
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August 2, 2020 - 10:28 am
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I’ve always had good service from “The Chain Man”, you’ll find him on the web. I’ve had chains and links from him to original spec but I’ve not had sprockets.  No doubt he can advise though.

Regards.

D7/14 hybrid (4 speed with D7 crank etc.) on the road, D10 Bushman awaiting rebuilding.

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rhi010
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August 16, 2020 - 9:31 pm
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I've had my chain from the chain man, no problem, if you have a plunger you should have a 1/2 link (std sprockets) and these are getting difficult to obtain. 

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Ringting
Newport Pagnell
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August 16, 2020 - 9:58 pm
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Hi, beware the 3/16" 415 chain! Have a look here.

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Hope that works. I know it's a different model but the chain spec is the same ans there's other applicable info.

Alan.

D1, D14/4, Guzzi LeMans, Triumph Trident 900, Maserati 160 t4. Mk1 Mini Traveller, Berkeley T60.

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SuperSun64
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August 25, 2020 - 4:13 pm
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Thanks everyone. So it looks like a 420 chain with 420 sprockets is the way forward. 

I'll have at the sources in the thread attached. 

Mild steel rivets from Amazon I think. Use my dads old rivet snaps to get 'em in place.

Kindest regards

Andrew

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mike p5xbx
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August 25, 2020 - 5:11 pm
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if you are really going to the trouble to fit 420 sprockets be careful not to buy any described as 420H (heavy duty) chain
its to wide and it will catch on the final drive oil seal holder bracket

D? - D10- D14 Bantams 350 AJS -500 Triumph http://bsanotru.....lfire.com/

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SuperSun64
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August 26, 2020 - 2:38 pm
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Thanks. Thinking of getting the whole lot from Feked. I'll go for 420 front (15 tooth as thats whats fitted) and rear sprocket (47T) and a 420 chain (116 links with a split link) as described on their site.  Any thoughts ?

Kindest regards

Andrew

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