1980 Yamaha XS400

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XS400 New Member
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yeaaa i told the body shop crew bout da stash now ever grease monkey from buckshot holler phones in between brake jobs to brag about which fresh milf clip they shot rocket to at lunch break. first dude goes: "site got this mom with tits swingin like church bells and she teaches her stepdaughter how balls taste." boss damn near fires his ass for moanin under da hood an breakin lug nuts. but hey free fuck fuel keeps the guys from sniffin degreaser, good hr policy if ya axe me. some skanky latina clip surfaces too where she squirts so hard a mechanic hops the bay yankin pants back on like an ant-gril parade. lunch break afterward smelt like mcdonald frygrease mixed with shame and victory.
https://wickedsick.tv/video/hot-pornstar-jessica-fiorentino-fucks-with-two-gay-men/
https://trueporner.com/video/hottie-pill-whore-sucks-my-tiny-cock/
https://pornfans.org/video/16-yearss-ago-my-asshole-was-broken/
old lenny the corn-guzzlin burp-bag limped in last throwthursday swearin up-a-storm he'd found a corner droppin xxx anime cuties spammed with jizz eruptions. i'm talkin barely legal tentacle parties an slutty robot teens assumin the position louder than lenny's rottin leaf-blower muffler. he narrated every filthy frame like it was the superbowl, shoutin "BOOM-alien tongue in that pink android pussy!" till the bartender threatened to reuse his fat lip as garnish. anyway that just proves the place stocks everything short of your sister's baby shower vid, unless ya dig that-then it's somewhere page fucken 321. only jury left is you grabbin a forty and seein how deep the rabbit hole burrows.
 
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When I bought mine I had 115 and 90. It ran, but not well and pretty loud. Turned out my head was cracked as I could hear and feel air pulsing out around the spark plug, but from deeper in the cooling passage beyond the plug. If I were you though I'd start with adjusting the valves first, maybe they are out of whack. I got a good head with valve cover off ebay, lapped the valves and re-ring and it runs great now.
 
As tstidham said, valve adjustment has to be verified. Be careful because this engine has a 180 degrees crank and it is possible to try to adjust the valves when the engine is not on compression stroke TDC; you should be able to move the rocker up and down with your finger. Also, maybe first, check that you have a good spark at both plugs and make sure that fuel is really reaching them (smell the tip). I hve read some times here that some guys would remove the cap from the spark plug while the engine is turning and key is on START; nevr do that and always make sure that the plug is touching a good ground otherwise you will burn the cpacitor inside the CDI (capacitor discharge ignition). Think of the capacitor as a balloon; if it is not discharged (balloon deflated) before getting another fill, it will burn (balloon blow).
 
"Also, I've read about putting oil or atf into the cylinder and letting it sit for a few hours to improve the compression, has anyone had luck with that on these bikes?"

It can yes. Mix some 2 stroke, a tiny bit of kero and a tablespoon of acetone in about 1/2 cup ATF, and syringe about 1 tablespoon of the mix in. Take the plugs out and kick it over, until you free all the hydrocarbons into the atmosphere. Check the static comp with the device.


"...heard a weird noise from I believe the right cylinder, like a tch, tch, tch sound, possibly air escaping? Now onto my question."

Check valve clearances. Plugs out, socket on the crank, battery earth off, and turn. Check both TDC's (360°) on each cylinder. You should aim for 4-8 thou/inch intake (.11mm-.21mm) and exhaust 8-10 thou/inch (0.21mm - 0.25mm). I go for 8 thou intake 10 thou exhaust.

As for rings and all the rest, do a timing chain while tearing the head off and replacing rings and gaskets.

Also check the torsional play of the crank bearings. These are old bikes, not invincible to the rigours of abuse and neglect. 45 years does no favours to rubber and plastic components, and if any alloy or steel touches moist salty air and storage, oxidation will not be friendly.
 
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