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Adjusting chain tension? Single sided swing arm (AF1 125)

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AzzA1990
Nova Slayer



Joined: 28 Apr 2014
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PostPosted: 16:14 - 10 Oct 2014    Post subject: Adjusting chain tension? Single sided swing arm (AF1 125) Reply with quote
I have just received a new chain and sprocket kit for my aprilia AF1 125 which was listed as exactly the right one for my bike however the chain seems to be roughly 3 links to short and i have no idea on how to move the rear wheel to the point of where the chain would be at it's slackest? the bike has a single sided swing arm

When i got the bike i brought it as a project, it came with no chain so i don't no weather i have just been sent the wrong length chain or weather the wheel needs adjusting

Thanks in advance! Smile
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arry
Super Spammer



Joined: 03 Jan 2009
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PostPosted: 16:17 - 10 Oct 2014    Post subject: Reply with quote
Here seems to explain it:
https://www.apriliaforum.com/forums/showthread.php?234009-Chain-slack-adjustment

https://www.motorcyclespecs.co.za/model/aprilia/aprilia_af1_125_sports_pro%2092.htm

Quote:
The neat chain adjuster is a doddle: undo two pinch bolts, insert a locking tool through the wheel hub and spindle carrier, then turn the wheel to get the right tension. (The dealer who stung a local learner £15 for five minutes' work needs a good smack.)
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AzzA1990
Nova Slayer



Joined: 28 Apr 2014
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PostPosted: 16:39 - 10 Oct 2014    Post subject: Reply with quote
arry wrote:
Here seems to explain it:
https://www.apriliaforum.com/forums/showthread.php?234009-Chain-slack-adjustment

https://www.motorcyclespecs.co.za/model/aprilia/aprilia_af1_125_sports_pro%2092.htm

Quote:
The neat chain adjuster is a doddle: undo two pinch bolts, insert a locking tool through the wheel hub and spindle carrier, then turn the wheel to get the right tension. (The dealer who stung a local learner £15 for five minutes' work needs a good smack.)


I have just tried this and it's obviously the correct way of doing it how ever my wheel did not want to move at all when i tried doing it, maybe something is seized Confused
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arry
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Joined: 03 Jan 2009
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PostPosted: 16:45 - 10 Oct 2014    Post subject: Reply with quote
Keith explains it a little better

Kickstart wrote:
One thing you will need to know is how to adjust the chain. On the swinging arm you will find 2 bolts at the back between the sprocket and disk. Slacken these off a couple of turns. On the wheel you will find a small (~5mm) hole in one of the large holes (think it is vertically below the centre of the wheel in the pic above). Roll the bike forward until that hole lines up with another hole in the eccentric mount in the swinging arm. You then lock the wheel to the eccentric with a long pin (there would have been one in the tool kit originally, almost certainly long gone) ; if desperate use a hefty cross head screw driver. Then you roll the bike forward a few inches. This way the wheel turns, rotating the eccentric in the swinging arm and moving the wheel back a touch. Once correct remove the pin and tighten up the 2 pinch bolts. Then check the chain adjustment is correct the whole way round.
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AzzA1990
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Joined: 28 Apr 2014
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PostPosted: 09:55 - 11 Oct 2014    Post subject: Reply with quote
I have just noticed that M&P have sent me a 38 tooth rear sprocket when it was meant to be a 37 tooth according to there description

Would this mean i would have to get a longer chain ?
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 11:13 - 11 Oct 2014    Post subject: Reply with quote
Hi

Depends on the AF1

Original AF1 (1987 model) used 16:36 gearing.

'88 model AF1 Sintesi used 16:37 gearing.

'89 model AF1 Sintesi used 16:37 gearing.

'90 AF1 Sport used 16:37 gearing

AF1 Futura used 16:38 gearing.

AF1 Europa used 16:38 gearing.

Not 100% sure on chain length (108 links rings a bell for the original AF1, and the AutoData book lists 106 links for the Futura and Europa), but chains always come in lengths that are multiples of 2.

All the best

Keith
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Old Thread Alert!

The last post was made 11 years, 123 days ago. Instead of replying here, would creating a new thread be more useful?
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