Front Sprocket details

Maestro, SEI-V
davel182
Posts: 111
Joined: 18 Feb 2016 12:01
Location: Wolverhampton
Location: Wolverhampton

Front Sprocket details

Post by davel182 »

Is anyone able to confirm (or refute) that part number 19.01.39 is the 520 version of the standard 19.01.31 front sprocket (14t) and, if so, does it have 12 splines approximately 20mm o.d. / 18mm i.d., and does it use the stop ring (22.01.54)? I don't have a 500 but the 250 single and since I cannot find a front sprocket to fit (428), I am hoping the splines might be the same on the 500, and convert to 520. I did email Richard at Mdina but, as sometimes happens with enquiries, no response. If it doesn't have the stop ring, what stops it going on too far and out of alignment?

Thanks for any help.

Dave
mbmm350s
Posts: 666
Joined: 22 Jun 2018 10:18
Location: Reading UK
Location: Berkshire UK

Re: Front Sprocket details

Post by mbmm350s »

Hi Dave

19.01.39 is the 501 camel sprocket.

I cannot see the stop ring part you refer to in the Camel parts book,
hopefully a Camel owner will be able to help.

The camel 501 owners book says transmission is 14/46

Sorry I cant help more.

Mark
davel182
Posts: 111
Joined: 18 Feb 2016 12:01
Location: Wolverhampton
Location: Wolverhampton

Re: Front Sprocket details

Post by davel182 »

Thanks Mark

Mdina actually have a picture of 19.01.39 so I can see there are 14 teeth and 12 splines and the description includes 520; with them having 47 units, I just assumed it might be the 520 version of the 'normal' 500. But it might still be OK if the splines are the right size (for me). For the 250 I would (probably) use a 44t rear.
mbmm350s
Posts: 666
Joined: 22 Jun 2018 10:18
Location: Reading UK
Location: Berkshire UK

Re: Front Sprocket details

Post by mbmm350s »

HI Dave
I would order it anyway I am sure you will be able to workout how to get the offset correct even if you need to modify the sprocket.
Mark
'It must be a .....'
Posts: 365
Joined: 12 Sep 2010 12:25

Re: Front Sprocket details

Post by 'It must be a .....' »

Hi Dave, the 501 (520) and 500 (530) sprocket splines/size are all the same; 12 splines with the diameters just below the 20mm and 18mm (I measured the shaft).
They all use the same spring/stop ring 22-01-54 as the 250 single which uses a 19-01-29 sprocket.
Trust this helps, Ian
PS As Mark says the 501 sprocket is 19-01-39
davel182
Posts: 111
Joined: 18 Feb 2016 12:01
Location: Wolverhampton
Location: Wolverhampton

Re: Front Sprocket details

Post by davel182 »

Thanks Ian (and Mark). Just what I needed to know. 530 would be OTT for the 250 but I think 520 might do the job. I'll order one.
norbert
Posts: 750
Joined: 15 May 2007 15:15
Location: Lübeck/Germany

Re: Front Sprocket details

Post by norbert »

520 is ok for all our bikes.
The last 3 sprockets I bought for the 500/501/250T all came without the stop ring. You can mount them without that ring, never had problems because of that. The only thing is to get the sprocket off when wasted, is that your need an extractor (three arms). To be able to use the extractor the chain must be off, because ther is only little space. So better use a chain with a lock you can open, otherwise with an endless chain you have to cut the chain.
I was not able to find the stop-ring/spring anywhere. At my last sprocketchange I destroyed the old one to get that ring off and put it on the new one (because I had an endless chain in stock). But as I said, during years I used the sprockets without that ring witout problems for the chain alignment.

norbert
davel182
Posts: 111
Joined: 18 Feb 2016 12:01
Location: Wolverhampton
Location: Wolverhampton

Re: Front Sprocket details

Post by davel182 »

Thanks Norbert. That is good to know. The batch of 250T sprockets that NLM had made (with boss welded to sprocket) are very poor (in my opinion) and just go on to the shaft too far when you tighten the nut.
'It must be a .....'
Posts: 365
Joined: 12 Sep 2010 12:25

Re: Front Sprocket details

Post by 'It must be a .....' »

Hi, as I have a 500 engine apart, I looked at the fitting of the sprocket (tried 2) with and without the spring/stop ring fitted.
Without the ring the sprockets went on the shaft a further 0.5 mm, (push fit only as I didn't fit and tighten the nut).
norbert
Posts: 750
Joined: 15 May 2007 15:15
Location: Lübeck/Germany

Re: Front Sprocket details

Post by norbert »

That´s interesting, I never realy controled that. I think with 0,5 mm we can live, don´t we?
davel182
Posts: 111
Joined: 18 Feb 2016 12:01
Location: Wolverhampton
Location: Wolverhampton

Re: Front Sprocket details

Post by davel182 »

Just so I'm clear, do the new 501 sprockets (19.01.39) have a groove for the ring or not? I have the ring from the original sprocket so I could fit that if they have. Thanks for all the input. Dave.
'It must be a .....'
Posts: 365
Joined: 12 Sep 2010 12:25

Re: Front Sprocket details

Post by 'It must be a .....' »

Yes the e 501 sprocket has a groove and you can reuse the spring/stop ring, but they can be very difficult to remove and really go flying so be careful.
davel182
Posts: 111
Joined: 18 Feb 2016 12:01
Location: Wolverhampton
Location: Wolverhampton

Re: Front Sprocket details

Post by davel182 »

Thanks for the warning but I already found that out! Luckily I managed to find it. Actually Mdina have the part listed (20 units) so I may order one with the spocket. Thanks again for all the information.
davel182
Posts: 111
Joined: 18 Feb 2016 12:01
Location: Wolverhampton
Location: Wolverhampton

Re: Front Sprocket details

Post by davel182 »

Just a word of warning. I did indeed order a stop ring along with the sprocket but the new ring is bigger and does not fit in the groove (I did cut a bit off but it still got damaged during fitting) so better to be careful with the old one.
mikebn
Posts: 48
Joined: 18 Mar 2007 10:04
Location: southend essex

Re: Front Sprocket details

Post by mikebn »

hello i have splined front sprockets 520 and 530 12 splines for 20mm shafet all new
Hi i own a 1976 morini 3 1/2 sport wire wheels disc brake front,
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