yz426f blown head gasket?


5 replies to this topic
  • BenShachter

Posted May 26, 2013 - 02:20 PM

#1

So I finally got my 2000 yz426f up and running. However it appears to be overheating very quickly. Coolant is spewing from the drain line and smoke is steaming out of the lower right side of the motor. The bike runs and rides pretty darn well right now....just the overheating problem. I know these bikes aren't meant to idle for more than a minute or so, but the smoking and spewing of coolant seemed a little much. After talking with a neighbor he suggested that my head gasket is possibly blown. What other signs should I look for as far as the blown gasket, and are there any other diagnoses that you guys can think of?

  • grayracer513

Posted May 26, 2013 - 03:02 PM

#2

Does it overheat while you ride, or just when you let it idle for two minutes?

  • BenShachter

Posted May 26, 2013 - 03:27 PM

#3

You know, I'll have to pay more attention to it tomorrow morning when I have some time. But I'm pretty sure it was just overheating while stationary. While riding it felt pretty darn good! Just freaked me out talking to a neighbor, after he looked at it for a second he thought maybe my head gasket was bad. He has a few KTM's, but I'm not sure the extent of his knowledge.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • grayracer513

Posted May 26, 2013 - 04:32 PM

#4

The bike won't ordinarily idle for more than one minute without venting coolant. See how it works while it's moving.

  • BenShachter

Posted May 27, 2013 - 01:33 PM

#5

Alright, so I took the bike for a more intensive ride this morning and everything seems to be good! No overheating, and overall the bike was running really well. Once or twice though when I would shift into neutral, or pull in the clutch the motor would rev really high? Would that be because of an air leak somewhere? Or another issue?

  • grayracer513

Posted May 27, 2013 - 05:24 PM

#6

Air leak, open hot start plunger, clogged pilot jet, or tight intake valves.





Related Content

Forums
Photo

yz250x vs 450 4t comparisons (preferably desert riding) needed by JakeNorthrupYZ450F


Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 replies
Forums
Photo

Snake pit oct 30th by The Anvil


Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies
Forums
Photo

Megabomb Fitment by 288yz450


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 1 reply
Forums
Photo
Motocross

Thinking about Yamaha 250... by Arctic Pride


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies
Forums
Photo

Michigan Motocross Tires by 288yz450


Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply
 
x

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.