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Author Topic: What's up with this  (Read 249 times)

Offline Xs7501978

  • Posts: 21
What's up with this
« on: Jul 21, 2017, 13:26:57 »
So I was wondering why my bike shoots out white exhaust sometimes...
Here's a video if anyone wants to see.

Offline datadavid

  • Posts: 1064
Re: What's up with this
« Reply #1 on: Jul 21, 2017, 13:32:30 »
Thats leaking intake valve guides. If it shoots plumes of smoke on deceleration/engine brake its piston rings. You need new seals. Has it been standing a long time?

Offline Xs7501978

  • Posts: 21
Re: What's up with this
« Reply #2 on: Jul 21, 2017, 13:40:11 »
Well the guy before me bought it after it had sat for years... But he "rebuilt" it over the winter and then it sat maybe 1 month while I worked on it this summer. Are seals a cheap buy and easy fix or will this be a big project?
Also is it okay to drive it with this leak?
« Last Edit: Jul 21, 2017, 13:52:42 by Xs7501978 »

Offline firebane

  • Posts: 417
  • braaaaaaaaaaap
Re: What's up with this
« Reply #3 on: Jul 21, 2017, 14:18:40 »
Could be condensation as well... Ride it like you stole it for a bit and see if it persists.

Offline datadavid

  • Posts: 1064
Re: What's up with this
« Reply #4 on: Jul 21, 2017, 14:23:39 »
Yea you can drive it no problem, until the plugs foul or the oil mix gets so bad it wont fire. I bought a  77 xs750 that smoked, not as bad as this though, but a few thousand kms ad a few oil changes later and it was completely cured with great compression. Is this first time your starting it after you got it, or have you been running it a few miles? Just to rule out condensation or oil sitting in the barrels.

Offline datadavid

  • Posts: 1064
Re: What's up with this
« Reply #5 on: Jul 21, 2017, 14:25:35 »
Seals are cheap but head has to come off, unless you can lock the valves with compressed air, then you can switch them without disturbing the head gasket. Which would be preferrable.. 😃

Offline Xs7501978

  • Posts: 21
Re: What's up with this
« Reply #6 on: Jul 21, 2017, 21:43:29 »
No I've been driving it. It rarely smokes and normally just for a second or 2, like at a stoplight. The video was the worst it smoked and I restarted it and it was not smoking. I've been riding it like I stole it and it runs fine.

Offline datadavid

  • Posts: 1064
Re: What's up with this
« Reply #7 on: Jul 22, 2017, 01:49:38 »
Do a few oil changes then, see if it goes away.