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If the model numbers are the same, they will be the same parts built to the same specs. Of course, there are production line variations.
If there are slight variations in the model numbers, they may be the same or they may be slightly different (typically slightly cheaper) to prevent exact comparison to the regular part as Daniel R. Hicks said in a comment. This is because a manufacturer can do a large order for a part specific to OEMs which may be branded some way or slightly cheaper to them or not come with certain accessories or warranties which the manufacturer sources from other manufacturers (which can cut some costs, and possibly increase or decrease quality).
This ability to do bulk purchasing is the primary way that complete bikes are cheaper (they're buying 10s of thousands of cranksets or whatever without retail packaging or manuals or stuff, when you're buying 1 in a nice box with a warranty pamphlet and installation instructions and stuff, along with a markup for the shop). Naturally, its convenient to give the OEM and Retail versions different model numbers to keep things straight (for example, the OEM version's warranty is typically through the complete bike manufacturer, not the part manufacturer and may be shorter than the retail version, and it keeps stock easy to keep track of). This can be substantial - If you walk into Radio Shack for lets say a LM741 op amp, they'll charge you at least $1.50 for one of them (they don't do bulk discounts). My usual retailer for these type of parts, Digi-Key, sells the same part (possibly made by a different manufacturer, but I know to be of essentially same quality) for $0.70 each without the retail packaging (just cardboard boxes filled with foam and the chips in them) if I buy just one at a time, and for $0.28 each if i buy in lots of 1000 or more. Thats around 19% of the price I would have paid at Radio Shack, for a bit different packaging and just getting it in bulk from a wholesaler (certainly, digi-key is marking this up as well. If I were a huge company, I could probably skip them and go straight to Texas Instruments or whatever, and order my 1 million op amps at an even lower rate!). The complete bikes also often ship essentially assembled correctly, so you further save money on the total cost of the bike by not having to pay as much time for a tech at the LBS to do things. This is known as "economies of scale". [To drive the point home: As Kibbee points out in a comment, this is why the "losing money" articles news sites often run on electronics are faulty - the sum of the costs of parts to a consumer whose only buying a few of each part will be higher than the cost of the device, but when you're buying large quantities of each part, the sum of the costs will be significantly less. Those articles do make for great click-bait though!]
To quote Surly on this: "Can I get the same stem/crankarm/saddle/handlebar as the one that came on my Surly complete bike?" "No, we don't offer most of the stock parts that come on our complete bikes. These parts are sourced from the manufacturer directly and aren't usually available for purchase, but in most cases you can get something darn close or even better from your LBS"
(Surly is owned by QBP, so they can source a lot of stuff from QBP at a very good rate, which can bring down costs at little to no quality penalties versus using other manufacturer's parts, and can do custom runs for similar products that would be sourced from QBP without accessories or fan fare)
Remember that a lot of bicycling things on part quality is in people's heads. If I took a Deore derailleur and made it to say it was a Tourney derailleur and people saw it, a lot of people would say it performed inherently worse than one that I hadn't scratched out the decal on. Also, there is variance in manufacturing and riding conditions, so sometimes you get a part which lasts longer than others in the same batch or model or comparable models. It would be near impossible to get a statistically significant sample telling you that aftermarket parts are different than the parts with the exact same model number supplied to bike manufacturers (I highly doubt it exists). Also, when someone pays for something, they often believe it to be better than the "free" thing (there was a Newsweek article about 6 years ago talking about how colleges priced themselves higher so people would believe them to be better). We see this all the time with other products in our lives, such as badge-engineered cars among other things. Finally, remember that a lot of people replace things as they break, when typically the parts aren't running well anyway, lowering the perceived quality versus the replacement, even if they are the same part.
There is a practice, commonly used in the electronics industry, known as "binning", where parts are tested, and higher performing parts are often branded differently than lower performing parts and sold at a higher price (and when there are more higher performing parts than necessary, they are often branded as lower quality parts. Overclockers in PC's, for example, often take make use of this for unlocking cores and extra performance and what not). However, it doesn't really make sense to do a binning for lower quality and higher quality things in the same model number and sell the lower quality ones to bike manufacturers - the parts in a bicycle are simple enough from a machining standpoint typically that they can be made amazingly consistent, so the variations aren't great, and this just adds complexity to the supply line as well as opens up the manufacturer to possible litigation.
If they are different models, then sure there can be differences in quality (you may fit a cheaper part for something not very important or a wear item or something that people aren't used to noticing (as noted in one of the comments) like a cassette or saddle (which is hard to choose due to personal preferences) or pedals (often thrown out for some clipless system on more expensive bikes) when build the complete bike, knowing that this will bring your costs down and the rider is going to replace anyway with something better once it wears out). You can save some money this way (and certainly, this is substantial for bicycles which are cheaper).
In any case, I wouldn't lose any sleep over it and would just ride things until they need replacing. Then just pickup whatever looks good and move on with your life.
Genuine parts are components that are made by the same company that manufactured your motorcycle e.g. Honda genuine spare parts are made by Honda themselves for their vast range of Honda motorbike models. As Honda genuine spare parts are designed and manufactured to Honda’s precise specifications and tolerances, you can be sure they will perform reliably and give long service life.
Genuine parts are specifically designed to fit the model of the bike they are made for, so fitment should never be an issue if you order the correct spare part.
Peace of mind: As mentioned above, genuine parts are specifically designed to fit your bike so if you order the correct part, there will be no issue with fitment and compatibility. Who would you trust more? The Honda engineers that designed, created, and exhaustively tested the bikes and its components or the third-party manufacturer that recreates the part?
You can be assured by using Honda genuine parts that your bike’s mechanics will continue to work as reliably as intended, (and ensure the continued reliability of the associated components within the particular area of your motorcycle) and that equipment error will be reduced to other components.
Greater Value in the long term: Non genuine parts are in most cases cheaper, so your up-front costs are lower. However, by choosing to purchase genuine parts you can get more value in the long term as you save yourself money, time, and hassle. Genuine parts are guaranteed to fit your motorcycle meaning there’s no reason to question fitment. Genuine parts are usually superior in quality so perform better in the long run so you get better performance, parts won’t need replacing as often saving additional expenses. You also need to factor in the time and effort to fit these parts that need replacing. If you must do this more often compared to genuine parts, the initial savings you get from cheaper non genuine parts are redundant in the long term.
Warranty Compliance: Using anything but genuine parts while your motorcycle is under warranty will void it. The warranty will include parts so if something goes wrong, you will receive a replacement or repair from the manufacturer. However, if you use non-genuine parts, it will most likely void it. So always use genuine parts to continue to benefit from your warranty on new bikes.
Parts available for longer: Genuine parts are available for longer. Most aftermarket companies stop making parts for old or discontinued motorcycles as the demand decreases. Aftermarket companies do not want to be left with inventory as storage will become an issue and will affect their margins so will discontinue and move onto more profitable segments. Genuine parts also get discontinued however manufacturers like Honda still produce parts for bikes that are over 40 years old such as the Honda cub range.
Greater Parts Availability: In many cases there are parts that are only made by the manufacturer of the bike. Items such as bolts, nuts, screws, and pins are often only available from the manufacturer. For new bikes it can take years or longer for aftermarket options to become available as it will take time for the aftermarket companies to develop parts.
Manufacturer warranty: Depending on the manufacturer of the genuine parts, you will be covered by warranty for a given period for any defects. Honda warranty lasts six months for genuine motorcycle parts in Europe. You may not get any warranty on aftermarket parts as this keeps costs down.
Usually More Expensive Upfront Costs: In most cases, non-genuine parts are cheaper so you save money from the initial upfront costs. However, in the long run these savings usually don’t hold as genuine parts are generally of a higher quality, so bike performance is better compared to using non genuine ones and the parts last longer which means less expenses and no time wasted for replacing.
Not all motorcycle manufacturers create every single component for the bikes they produce. They sometimes commission outside companies to do this for them to their exact requirements. These part companies hired by the original bike manufacturers are known as Original Equipment Manufacturer (OEM). These parts have the same advantages and disadvantages as genuine parts.
OEM part makers that sell parts under their own company name or branding cannot be classified as genuine as they are not sold by the bike manufacturer in their branding and packaging. This is the primary difference between genuine and OEM parts. For example, Honda uses spark plug specialists NGK to produce their spark plugs such as the widely used NGK CR8EH-9 (part no: 98059-58916) spark plug.
Aftermarket motorcycle parts are bike components that are produced by companies other than the original manufacturer of the motorcycle. They are not associated with the motorcycle manufacturer but can legally produce and sell parts for their bikes.
The main advantage of aftermarket parts is that they usually cost less than genuine parts, however this initial cost saving does not usually equate to sustained long term savings as these parts are usually inferior in quality and performance. Many aftermarket brands use lower quality materials compared to genuine parts to lower their price points.
Numerous aftermarket parts are built to fit as many different bikes as possible to increase margins and production efficiencies so fitment can be a concern. Whereas this isn’t an issue for genuine parts or OEM parts.
Aftermarket parts can be more customisable compared to genuine parts, in particular for accessories. There are usually more options with aesthetics such as colours.
Usually, aftermarket companies are behind on supplying aftermarket part options as they will have to wait until they get access to specs or the part so they can try to replicate it. This obviously isn’t an issue for genuine or OEM parts.
Used motorcycle parts are also known as second-hand, recycled, breaker or salvage parts. This classification of parts can be genuine, OEM or aftermarket parts. Used motorbike parts are functional/working parts that have been previously used and are salvaged from motorcycles that are no longer in use. The quality and condition of these parts will vary greatly. Some will be in good condition as used part suppliers or sellers will restore these parts or they will be sold as they were salvaged so conditions of the parts will vary greatly. Pricing for the type of parts depends on many factors such as the condition of the used part and market factors such as supply and demand for the part in question.
The main advantage of used parts over all other types of parts is availability/scarcity of new parts for certain bike models, especially classic/vintage ones. There may not be any available new parts as the bike manufacturers have ceased production of a model and with no aftermarket parts also available, the only option left is used ones.
Another advantage will be better prices if there are genuine, OEM and/or aftermarket versions of the part available. However, this price advantage will be offset when you compare the quality of the used part versus the quality of the new unused genuine part.
In most cases these used parts will never be tested once removed and you will have no idea how well the part was maintained before extraction. This isn’t an issue for genuine new parts, and you can be totally confident that the part is safe and works as it should.
If you have any questions or require any assistance when ordering Genuine Honda motorbike part(s), contact our parts specialists here or through our online chat support.
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