Do XJ11 & XJ 750 partd interchange?

[garyb]

I've been doing forum searches most of the afternoon trying to figure out if the 1982 XJ1100 is the same bike as the '82 XJ750. Do the chassis components, tanks, seats etc. interchange? I'm trying to figure out a better looking seat for my XJ11. THANKS! Garyb

[Jerry]

Garyb:

The 1100 and 750 XJs are considerably different motorcycles. I have not heard of any major parts (tanks, seats) being interchangeable. However, there is a where used database at http://www.benefiscal.co.uk/index.php that might be of help.

[garyb]

Do XJ11 & XJ750 parts interchange

Hi Jerry, Thanks for the reply and directing me to a great website. I will be using it in the future for sure! The only XJ bike they list is the 1100 so I was not able to get the information I need. The untrained eye (mine) says the two bikes look the same. Maybe I'll just go back to plan A & try to find a XJ11 seat base to build a custom seat from. Any ideas? Garyb

[DGXSER]

You could try going to the microfiche at www.cmsnl.com

perhaps looking up the part numbers iwll give you some guidance.

[Jerry]

Garyb: Its the small things that don't immediatly catch your eye that make the difference. For example, the XJ 1100 seat is held in place by 2 "fingers" that hook it to the frame plus a 'toung" that slips under the fuel tank. The XJ 750 seat uses the same 2 fingers in the rear, but uses 2 brackets at the front of the seat to hold it in place. Thus, the 2 seats are not interchangeable, at least not without some modification.

Yamaha has parts fiche and diagrams on line; go to:
http://www.yamaha-motor.com/sport/parts/home.aspx
Pick the appropriate model from the drop down lists, go to the items you want to comare, and print out the diagrams for both bikes. Not always foolproof, but you can get a pretty good idea if the parts are the same or spot how they are different.

Keep in mind that Yamaha starts part numbers in 2 ways: If the number starts with a series of numbers, the part is generic hardware that may fit many yamaha models. On the other hand, model-specific items start with a number-letter combo. The XJ 1100 series starts with 10M, which means the part was first used on the XJ. Other parts, like gaskets, tranny parts, and other itmes may start with 2H7, which comes from the first '78 XS11 and was carried forward into other models. By this I can see that the XJ 750 used the same 'fingers' as the XJ seat, but the seat itself carries a different part number and mounts at the front differently, so I can be pretty safe when I say they won't directly swap.

This is not always foolproof either; the front brake rotors on all the XS - XJ 1100s are interchangeable even though the part numbers differ. Early rotors were solid and could be used left or right side, the slotted rotors from '81 on are side specific and carry different part numbers. However, if you use them on the correct side there is no reason why you can't use the slotted rotors on the earlier 1100s.

Your best bet, if you have a question after comparing the diagrams and parts list, is to ask here. Ultimately you may just have to try the parts in question, but the odds are good that most of the parts will not interchange, particularly if they begin with the number-letter combo that matches the first 3 letters/numbers of your frame or engine serial number. However, they may fit with some modification; it is up to you if you want to go down that road.