jefftwin
XS650 Member
Will any year of XS 650 engine bolt into any year of chassis? New to this bike and have a chance to purchase a running engine. Thanks for any help.
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engine interchange
- Thread starter jefftwin
- Start date
Not quite 70-71 have a slightly different front engine mount hole location. 70-73 engine mount sets are different than 74 up and need to be matched to the frame year , not the engine year.
so any 72 up engine will bolt into any 72 up frame
use 72-73 engine mounts with those year frames
All 74-84 engines, frames, mounts will directly swap.
so any 72 up engine will bolt into any 72 up frame
use 72-73 engine mounts with those year frames
All 74-84 engines, frames, mounts will directly swap.
Last edited:
My mistake op....
jefftwin
XS650 Member
jefftwin
XS650 Member
Thanks for the response.
That's news to me, Gary! I rode a 79 Special with XS1 cases and 447 crank and top end from 1992 to 1998, had no issues mounting the motor. The 79 front motor mount worked just fine.
Got em, seen the difference Griz, there's a thread with pics in here "somewhere". and a brit that welded, redrilled XS2 mounts to fit the XS1 case. The hole was about 1/2" further back. Maybe you have a bigger crowbar than I do. 
Probably doesn't matter to this poster.
These aren't the best angle but you can see the diff.
This pair wasn't marked for year but it's a better angle
Probably doesn't matter to this poster.These aren't the best angle but you can see the diff.
This pair wasn't marked for year but it's a better angle
Yeah guys, I'm aware of the difference in the cases. I still have the XS1 cases lying under the bench (early 256, had rods with needle bearing wrist pins on the original crank). Had that motor in and out of an F Special frame (severely damaged in 1998 crash and sent to crusher) several times. Used the 1-piece front mount from the F frame. The job never presented a struggle, and I didn't modify motor, motor mount, or frame. You have me scratching my old head bald!
2M I 'm lazy as it is, if I just kinda hint there's an old thread you step right up and provide all the links. You're like a forum based Alexa. 
Interesting stuff. I must have missed this topic when it first came up a few years back, in fact I know I did. I say that because I have an old junk XS1 motor and I used it as a template when building my "flipper" stand. Had I known there might be a mount difference, I would have investigated further. I could have ended up with a stand that would only fit early XS1 motors, lol. But, I lucked out. Seems the case change took place late in the XS1B production run, from engine #22833 on. Luckily my motor is in the 23000 range, whew .....
So Griz, check the number on your XS1 cases and I bet you'll find they're late production XS1B items.
So Griz, check the number on your XS1 cases and I bet you'll find they're late production XS1B items.
Sure, it's obvious that the hole is set back more than on later motors. No, 5twins, the motor number is S650-02323; it's an early XS1, came complete with needle bearing wrist pins. The bike had been chopped by a PO, had a holed piston on the right side, and the needle bearing rods were just waiting to cause trouble. I don't remember modifying mounts to hang that motor; as I recall, it went in fine with the late box type motor mount. But it's been awhile, and memory plays tricks.
Good catch there, 5twins. I've updated that XS1 mount thread, and the engine change chronology section of the early tech bulletins.
http://www.xs650.com/threads/xs1-engine-mounts.47629/
http://www.xs650.com/threads/yamaha-xs1-xs1b-xs2-tx650-tech-bulletins-service-data-brochures.31022/
Took a pic of my later-half XS1B front mount, s/n 024xxx, and it's definitely the shorter nose.
http://www.xs650.com/threads/xs1-engine-mounts.47629/
http://www.xs650.com/threads/yamaha-xs1-xs1b-xs2-tx650-tech-bulletins-service-data-brochures.31022/
Took a pic of my later-half XS1B front mount, s/n 024xxx, and it's definitely the shorter nose.
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