Here are graphics taken from the Caponord parts manual with hotspots added so you can see part numbers, prices and availability or alternatives for O-Rings used on the Capo as of May 2020. Each graphic is in alphabetical order. Where alternatives are listed I give the size and availability from a UK stockist. Bear in mind that many stockists (such as this one) either don’t sell them singly or charge a premium for buying small numbers. I appreciate that buying large numbers of something you only want one or two of is wasteful and expensive, however some O-Rings are well worth having several on the shelf – fuel connectors and oil filter housings come to mind.
| Air Box I | Air Box II | Crankcases II | Fuel Pump I | Fuel Pump II | Fuel Tank | Oil Cooler | Oil Tank | Rear Master Cylinder | Swingarm | Throttle Body |
Air Box I
Airbox IInformation Hover over any O-Ring for basic info and click for more detailed info or alternative if they exist 
AP8144063 O-Ring (£1.48 - Fowlers UK)Alternative part: Viton O-Ring 49.2 ID / 3.53 Section (BS830) |
Air Box II
Air Box IIInformation Hover over any O-Ring for basic info and click for more detailed info or alternative if they exist 
AP8220095 O-Ring (£0.71 - Fowlers UK)Still available (May 2020) Alternative part: Viton O-Ring 18.77 ID / 1.78 Section (BS018) AP8220095 O-Ring (£0.71 - Fowlers UK)Still available (May 2020) Alternative part: Viton O-Ring 18.77 ID / 1.78 Section (BS018) |
Crankcases II
Crankcases IIInformation Hover over any O-Ring for basic info and click for more detailed info or alternative if they exist 
AP0650500 O-Ring (£8.33 - Fowlers UK)Alternative part: Viton O-Ring 58.42 ID / 2.62 Section (BS141) available from simplybearings.co.uk - £11.16 for a pack of 10 = £1.11 each or Alternative part: Viton O-Ring 60.00 ID / 2.62 Section (BS142) available from simplybearings.co.uk - £5.16 for a pack of 10 = £0.56 each |
Fuel Pump I
Fuel Pump IInformation Hover over any O-Ring for basic info and click for more detailed info or alternative if they exist 
AP8144478 - O-Ring (£31.42) Becoming hard to find (May 2020) Alternative part: Viton O-Ring 142.88 ID / 5.33 Section (BS868) available from simplybearings.co.uk in multiples of two or more. Price for two - £16.69 inc. VAT AP8144475 O-Ring (£1.48 - Fowlers UK) Still Available (May 2020) Alternative part: Viton O-Ring 17.86 ID / 2.61 Section (BS617) available from simplybearings.co.uk available in multiples of two or more. Price for Five - £6.07 inc. VAT (£1.21 each) or for Ten - £7.66 inc. VAT (77p each) |
Fuel Pump II
Fuel Pump IIInformation Hover over any O-Ring for basic info and click for more detailed info or alternative if they exist 
Click for detailsNo Aprilia part number for this O-Ring Alternative part: Viton O-Ring 7.65 ID / 1.78 Section (BS011) from simplybearings.co.uk Click for detailsNot listed by Aprilia, however it is the same O-Ring as AP8144483 (£1.27 - Fowlers UK). This has been verified! Alternative part: Viton O-Ring 7.52 ID / 3.53 Section Click for detailsNo Aprilia part number for this O-Ring Alternative part: Viton O-Ring 7.65 ID / 1.78 Section (BS011) from simplybearings.co.uk |
Fuel Tank
Fuel TankInformation Hover over any O-Ring for basic info and click for more detailed info or alternative if they exist 
AP8120965 - O-Ring (£0.60 each - Fowlers UK)Still available (May 2020) This part is also used on the Throttle Body Alternative part: Viton O-Ring 4.48 ID / 1.78 Section (BS008) |
Oil Cooler
Oil coolerInformation Hover over any O-Ring for basic info and click for more detailed info or alternative if they exist 
AP8144008 O-Ring (£1.48 - Fowlers UK) |
Oil Tank
Oil TankInformation Hover over any O-Ring for basic info and click for more detailed info or alternative if they exist 
AP8120196 - Superseded - click for detailsSuperseded by AP9150469 (£3.97 - Fowlers UK) Alternative part: Viton O-Ring 13.95 ID / 2.62 Section (BS113) from simplybearings.co.uk AP8120190 O-Ring (£2.36 - Fowlers UK)Same part number as Item 20 Alternative part: Viton O-Ring 18.72 ID / 2.62 Section (BS116) available from simplybearings.co.uk AP8120190 O-Ring (£2.36 - Fowlers UK)Same part number as item 3 Alternative part: Viton O-Ring 18.72 ID / 2.62 Section (BS116) available from simplybearings.co.uk |
Rear Master cylinder
Rear Master CylinderInformation Hover over any O-Ring for basic info and click for more detailed info or alternative if they exist 
AP8144007 O-ring (£0.77 - Fowlers UK)Alternative part: Viton O-Ring 11.11 ID / 1.78 Section (BS806) from simplybearings.co.uk AP8144007 O-ring (£0.77 - Fowlers UK)Alternative part: Viton O-Ring 11.11 ID / 1.78 Section (BS806) from simplybearings.co.uk |
Swingarm
SwingarmInformation Hover over any O-Ring for basic info and click for more detailed info or alternative if they exist 
AP8144048 O-Ring (£0.71 - Fowlers UK)Alternative part: Viton O-Ring 25.8 ID / 3.53 Section (BS618) AP8144048 O-Ring (£0.71 - Fowlers UK)Alternative part: Viton O-Ring 25.8 ID / 3.53 Section (BS618) |
Throttle Body
Throttle BodyInformation Hover over any O-Ring for basic info and click for more detailed info or alternative if they exist 
AP8144485 - Lower O-Ring (£5.24 each)Mostly out of stock now. Alternative is: Viton O-Ring 9.3 ID - 2.4 Section available from simplybearings.co.uk AP8144483 - Upper O-Ring (£1.27 each - Fowlers UK)Still available (May 2020) Alternative is: Viton O-Ring 7.52 ID / 3.53 Section (BS203) available from simplybearings.co.uk AP8144483 - Upper O-Ring (£1.27 each - Fowlers UK)Still available (May 2020) Alternative is: Viton O-Ring 7.52 ID / 3.53 Section (BS203) available from simplybearings.co.uk AP8144485 - Lower O-Ring (£5.24 each)Mostly out of stock now. Alternative is: Viton O-Ring 9.3 ID - 2.4 Section available from simplybearings.co.uk AP8120965 - O-Ring (£0.60 each - Fowlers UK)Still available (May 2020) This part is also used on the Fuel Tank drains Alternative part: Viton O-Ring 4.48 ID / 1.78 Section (BS008) |