Just Purchased XS1100

[Napahkiin]

Hey everyone! I just purchased a 1980 XS1100 Midnight Special and had a few questions to get my build started. First off I wanted to get the model figured out, I'm assuming it's an XS100LG from the research I've done so far.

As far as buying things for the bike, what would be some good websites to get parts? I need to do fluids on it so an oil filter and some new fuel filters would be nice. Some of the hoses are a little old and need replacing. Expecually the manifold tubes coming out of the carbs they are hard as a rock and starting to crack.

I would like to replace the exhaust, it's got an aftermarket on there right now but it's blown out on the muffler and is pretty banged up underneath. It's a 4-1 right now but I would love to go back to the original where it's two 2-1 on each side I just don't know where I would even be able to find headers for it.

Sorry for the long post, this bike needs work and I have no idea where to start looking for things. I've never owned something this age, my other motorcycle is a 2020 model so finding parts for that is easy 😂. I love the bike and I know I'm not going to be able to restore it back to it's original glory but I still want it to be nice again. Please let me know.

[cajun31]

To verify the model, which I too suspect is an LG because of the straight spokes on the wheels, find the vin number on the neck of the frame as well as stamped on the engine. If the engine has ever been swapped you will know from the vin number. If the vin's match then you have the original engine. I would think you will find the vin starts with 4H3 and if it does then yes you have an LG. As for buying parts I use Partzilla, Partzilla: OEM Motorcycle Parts, ATV Parts, Marine Parts, Mikes XS Yamaha XS650 Parts & Vintage Yamaha Parts - MikesXS.com, Yambits Yambits : Yambits - Yamaha Parts (if you order from them make sure you get everything you need in one order because of the shipping costs), and of course for hard to find things I shop Ebay.
I have been using Super Tech 20w50 from Walmart for a while now. The manual calls for 20W40 and Yamaha used to supply it but quit several years ago so most use non synthetic regular conventional oil and the Super Tech is cheap and readily available. There have been several discussions about the use of synthetic in these bike and that it makes the clutch slip, however there are several members that say they use it with no problems. The reason I don't even try it is because the manual states that you should change the oil a lot more frequently then the mileage synthetics are rated for and the loose tolerances on these old bikes tends to contaminate the oil much more quickly then the more modern machines of today. Bottom line is make sure whatever oil you choose is rated for wet clutch use. The middle and final drives have hypoid oil in them and synthetic is fine for use in those.. I use Super Tech 75W 140 from Walmart. Cheapest around. Word of caution... don't drain the oil from the middle and final drives until you verify that you can get the fill plug out first. Depending on when they were last removed they can sometimes be hard to remove. You will be able to find the petcock internal fuel filters on Partzilla as well as on Ebay and other sources. I get my fuel hose from and local vintage motorcycle shop. I just bring a sample of what I have and we match it up for size and diameter. I think you are talking about the intake rubber manifolds bolted to the engine that are cracking. They generally do not crack all the way through and are still working fine as long as you don't have any leaks. If you want to replace them ... be careful of the ones on Ebay and offered by other vendors. Most are made cheaply and the brass vacuum tubes will pull right out of them. I use them but you will find that problem with most of them. I just pull the tubes out and use some good epoxy cement to glue them back in place. You will see the difference in price from genuine manifolds to the chinese knockoffs. Price is about a quarter of the price as the good ones. The cheap ones also don't have the reinforcement found in originals around the base. You need to make sure they are good because as you tune the bike you will be pulling plugs and hoses off of those brass ports over and over. I use Fram CH6002 oil filters. Only because I scored a large batch of them several years ago. You can find them or their equivalent online. Ebay sells some too but I find they are overpriced. Keep a constant search on Ebay for exhaust pipes. They occasionally show up. Best be for Oem is to grab what you can find and have them sandblasted and recoated.

[cajun31]

By the way spend some time going through the maintenance section of this site. Many how to's and sources for parts etc. Some defunct by many still active. Hopefully others will chime in on parts sources.

[Bax]

Adding a few suppliers to Cajun31 suggested list:
For used parts PM member Andreas Weiss.
Member Geezer makes updated voltage regs and has other electrical parts. http://www.oregonmotorcycleparts.com
Replacement rubber items can be found at Sumo Rubber in the UK. https://sumorubber.com/xs1100
NOS parts try Speed and Sport as well. https://speedandsportinc.com
I've purchased a few hard to find new items from Cruzin Image in Japan. https://www.cruzinimage.net/?s=XS1100
Len at XJ forever has a catalog of parts with listings for the XS. http://xj4ever.com/catalog/a-catalog-index.html
Sudco catalog. https://www.sudco.com

For the carb internal jets and needles use genuine Mikuni parts which you can get from Yamaha dealers.

Good Luck

---Bax

[Radioguylogs]

Most of my regular sources have already been mentioned except:

https://www.partsnmore.com/parts/yam...100lg/?filters[fitting]=custom
https://www.jetsrus.com/index.html

Someone ought to collect all these links and place them in a sticky note for easy reference.

[Napahkiin]

Most of my regular sources have already been mentioned except:

https://www.partsnmore.com/parts/yam...100lg/?filters[fitting]=custom
https://www.jetsrus.com/index.html

Someone ought to collect all these links and place them in a sticky note for easy reference.

Yeah Ive already made a bookmark file with all of these websites on my phone and computer 😂 thank you so much.

[Napahkiin]

To verify the model, which I too suspect is an LG because of the straight spokes on the wheels, find the vin number on the neck of the frame as well as stamped on the engine. If the engine has ever been swapped you will know from the vin number. If the vin's match then you have the original engine. I would think you will find the vin starts with 4H3 and if it does then yes you have an LG. As for buying parts I use Partzilla, Partzilla: OEM Motorcycle Parts, ATV Parts, Marine Parts, Mikes XS Yamaha XS650 Parts & Vintage Yamaha Parts - MikesXS.com, Yambits Yambits : Yambits - Yamaha Parts (if you order from them make sure you get everything you need in one order because of the shipping costs), and of course for hard to find things I shop Ebay.
I have been using Super Tech 20w50 from Walmart for a while now. The manual calls for 20W40 and Yamaha used to supply it but quit several years ago so most use non synthetic regular conventional oil and the Super Tech is cheap and readily available. There have been several discussions about the use of synthetic in these bike and that it makes the clutch slip, however there are several members that say they use it with no problems. The reason I don't even try it is because the manual states that you should change the oil a lot more frequently then the mileage synthetics are rated for and the loose tolerances on these old bikes tends to contaminate the oil much more quickly then the more modern machines of today. Bottom line is make sure whatever oil you choose is rated for wet clutch use. The middle and final drives have hypoid oil in them and synthetic is fine for use in those.. I use Super Tech 75W 140 from Walmart. Cheapest around. Word of caution... don't drain the oil from the middle and final drives until you verify that you can get the fill plug out first. Depending on when they were last removed they can sometimes be hard to remove. You will be able to find the petcock internal fuel filters on Partzilla as well as on Ebay and other sources. I get my fuel hose from and local vintage motorcycle shop. I just bring a sample of what I have and we match it up for size and diameter. I think you are talking about the intake rubber manifolds bolted to the engine that are cracking. They generally do not crack all the way through and are still working fine as long as you don't have any leaks. If you want to replace them ... be careful of the ones on Ebay and offered by other vendors. Most are made cheaply and the brass vacuum tubes will pull right out of them. I use them but you will find that problem with most of them. I just pull the tubes out and use some good epoxy cement to glue them back in place. You will see the difference in price from genuine manifolds to the chinese knockoffs. Price is about a quarter of the price as the good ones. The cheap ones also don't have the reinforcement found in originals around the base. You need to make sure they are good because as you tune the bike you will be pulling plugs and hoses off of those brass ports over and over. I use Fram CH6002 oil filters. Only because I scored a large batch of them several years ago. You can find them or their equivalent online. Ebay sells some too but I find they are overpriced. Keep a constant search on Ebay for exhaust pipes. They occasionally show up. Best be for Oem is to grab what you can find and have them sandblasted and recoated.

Thank you so much for all of the info, I did check out the maintenance section and there is awesome information on there. I can tell we are gonna be best friends throught this build of mine so I thank you for all of your knowledge.

[Napahkiin]

Adding a few suppliers to Cajun31 suggested list:
For used parts PM member Andreas Weiss.
Member Geezer makes updated voltage regs and has other electrical parts. http://www.oregonmotorcycleparts.com
Replacement rubber items can be found at Sumo Rubber in the UK. https://sumorubber.com/xs1100
NOS parts try Speed and Sport as well. https://speedandsportinc.com
I've purchased a few hard to find new items from Cruzin Image in Japan. https://www.cruzinimage.net/?s=XS1100
Len at XJ forever has a catalog of parts with listings for the XS. http://xj4ever.com/catalog/a-catalog-index.html
Sudco catalog. https://www.sudco.com

For the carb internal jets and needles use genuine Mikuni parts which you can get from Yamaha dealers.

Good Luck

---Bax

Thank you, I don't think the carbs are original but they are mikuni still, is there any way I can tell what model they are?

[Bax]

Napahkiin Carb ID..... It's probably best to just post a few pics of the carbs, someone here will recognize the specifics. Air box side looking down the mouth should get most of it answered. Many of these bikes had a mismatch on the array due to replacement carbs getting swapped in over the years. I think the original LG carbs were BS34iii


---Bax

[Ranger_xs1100]

This thread has some good info and pictures that may help you identify your carbs.
Carb Identifier Guide Take 2 - XS11.com Forums

Also I would like to point out a useful feature found on the parts supplier partzilla.com. They have a “related fitment” section on the individual part number page. Just find the part for your model that you are looking for and then scroll down to the right hand side of the page and you will find a list of other Yamaha models that use that same part. I have found that info to be very helpful when searching for parts from various other sources.

[cajun31]

This thread has some good info and pictures that may help you identify your carbs.
Carb Identifier Guide Take 2 - XS11.com Forums

Also I would like to point out a useful feature found on the parts supplier partzilla.com. They have a “related fitment” section on the individual part number page. Just find the part for your model that you are looking for and then scroll down to the right hand side of the page and you will find a list of other Yamaha models that use that same part. I have found that info to be very helpful when searching for parts from various other sources.

I hope an administrator is paying attention to your post Bob. It seems that link is missing on this site in the maintenance section. The first version of Steve's post is there but this one would be nice to have as well.

[DiverRay]

OK, I think I now have part 2 in the carb section. I only moved the main part, not the comments that came after.