What parts will fit

[Bibelot]

Just spent the last six hours chain-watching the stuff over at pornmoviessite.com and holy shit my balls are on empty. They've got one section that's nothing but thick milfs getting bent over kitchen counters by dudes half their age - every clip lands straight in the "mom wants hard cock" zone. One milf in pearls and stockings keeps looping in my head; she screams so loud the neighbors probably think someone's getting murdered. I jerked off three times to her getting that creamy pussy stuffed and I'm already aching for round four. Bookmarked the deepthroat and creampie tags because new uploads pop up every 30 goddamn minutes and the front page already teases tomorrow's batch of big tit step-moms.
https://pornmoviessite.com/video/stepmom-anal-strapon-prostate-massage-her-stallion-sperm/
https://pornolla.com/video/beautiful-female-teacher-x-students-penis-2/
https://pornvideosfans.com/video/a-...-up-in-the-shower-and-then-fucks-her-husband/
Another hour burned on pornolla.com and the selection of amateur couples is straight fire. No fake moans, just real moms filming themselves while the kids nap, husbands slamming their dripping pussy raw and spraying cum on those wedding rings. Some chick called hersel "suburban_slut_mom" invites her gym trainer over while hubby films - she rides his thick meat reverse cowgirl, those mature hips grinding like it's payday. Whoever thought real married moms could fuck with that much hunger needs a medal. Every visit I scroll until my wrist's sore, then reload because there's always a new homemade sex tape posted minutes ago and the comments are brutal in the best way.

 

[avemachina]

Hey there, welcome!

If you've got a 1978 year model, you likely have an E or 2E submodel. You can check on the right side of the engine, you should see "2L0" for the E or "2G5" near where the oil fill hole is. Based on what the Haynes manual says, the E has cast wheels/brakes, 2E has spoked wheels/drum brakes.

There's lots of cross-compatibility between years (I have an '81 Special II, 4R5, and a bunch of parts I've replaced are for '78-'79)--the hard cutoff I'd say is 1982. That's when they revamped the model with a new engine (DOHC), new airbox design, new body shapes, etc. 1981 is the year they did a "facelift" with a new gas tank shape and different handlebars (needs longer cables!), so watch out for that.

Take a look at the manual:

https://www.xs400.com/threads/re-run-free-full-yamaha-service-manual.14495/post-151524

First, identify your model code (page 129 has the codes for different years, as well as a summary of changes for each year). They also list the changes made year-to-year which should help identifying which parts can fit. And if you need to confirm the specs, those start on page 120.

 

[tstidham]

I have an example. My 78 head was cracked and I bought an 81 sohc head to replace. The end of the camshaft is different between a points ignition model and a tci electronic ignition, so I reused my original camshaft.