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  1. S

    XS400 Seca, running very slow and poor throttle response

    Yeah, it definitely feels like one cylinder dropping out! I think I'll do another carb deep clean and see what happens.
  2. S

    XS400 Seca, running very slow and poor throttle response

    Keep in mind guys, this issue pops up suddenly after the bike warms up. It clicks in like a switch. Doesn't just slowly show up, it hits like a hammer
  3. S

    XS400 Seca, running very slow and poor throttle response

    Alright. My mechanic said the valves are to factory spec, but I can't say he's been especially trustworthy up to this point.
  4. S

    XS400 Seca, running very slow and poor throttle response

    While that may be true, bikes don't also lose 75% of their power and backfire into the intake rampantly when they get hot. At least, they're not supposed to lol.
  5. S

    XS400 Seca, running very slow and poor throttle response

    Sounds like it, but the problem disappears when I let the bike cool down. Issue persists as soon as it warms up again. Didn't know that about the plugs though, thanks!
  6. S

    XS400 Seca, running very slow and poor throttle response

    First pic is left side, second pic is right side. As I said, these plugs were brand spanking new, they only have one ride on them before I pulled them to take these pictures. They are gapped correctly from the factory at about .028
  7. S

    XS400 Seca, running very slow and poor throttle response

    Another update. Swapped exhaust for another factory exhaust (don't ask why I have two). Revs much nicer now. Unfortunately, the issue came back. Here's my best explanation: 1. Runs mostly fine when cold/for around 10min of riding 2. Slight hesitation at low rpm's though 3. Moment of bliss...
  8. S

    XS400 Seca, running very slow and poor throttle response

    Yessir, that I did. Lots of compressed air and lots of carb cleaner, directly into the passages. I definitely need to fix the tank though, but I think I'll sell it before it gets to that.
  9. S

    XS400 Seca, running very slow and poor throttle response

    Ah, thanks. I did install the filter at least, necessary considering my rusted out tank
  10. S

    XS400 Seca, running very slow and poor throttle response

    Thanks Ranger. Unfortunately, the issue is back, and in full force. Amongst other problems, I'm just going to see if you guys can help me identify this one issue. Right side is definitely the culprit. Feeling the exhaust while it's idling, the right side is weaker and popping lightly every...
  11. S

    XS400 Seca, running very slow and poor throttle response

    Wow, you guys were right! I deep cleaned the carbs, and it fixed the issue. One of the cylinders that slide in the middle of the carbs (don't know what they're called) was locked up, and the fuel inlet thingies (with the mesh filter and loose jet, right above the floats) were pretty dirty. I...
  12. S

    XS400 Seca, running very slow and poor throttle response

    My bike has been plagued with issues for the longest time. Just got the most recent issue fixed by my mechanic, and now these issues present themselves. In short, my bike feels like it's missing about half of its horsepower. Giving it throttle from idle, the throttle bogs for a good second...
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