06 yz450f rebuilt top end, won't start!

1 reply to this topic
  • A.Sailer95

Posted December 04, 2015 - 05:13 PM


Hey guys so I just got my top end back together after putting a new head gasket in and I've been kicking it over for the past hour and she won't start. It'll fire every now and then but won't run. I made sure the cams were timed right according to the manual and I took the head in to a machinist that does heads for bikes all the time so he properly seated the valves. Not too sure what to look for now, any suggestions?

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • dougla12

Posted December 04, 2015 - 06:21 PM


I'm no expert but for me I would try some things first. Double, check timing. Check the valve clearances.. Check the spark next.. Check fuel next (kick it while twisting the throttle and check the plug; should be wet from the gas).. Check compression (have the compression tester?)
And wouldn't hurt to take back off the head and double check that the valves have been seated properly .
Did you try push starting?
Again no expert just my 2 cents worth

Related Content


yz400f throttle bog by yz400fmaniac

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • * * * * *
  • Hot  28 replies

2016 YZ450 by CaptainKnobby

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies

Is the 2016 GYTR Yamaha YZ450F too fast? by Fryboy

Dirt Bike   Special Interest Forums   Pro Racing
  • * - - - -
  • Hot  241 replies

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

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

Is it worth it? (Cam and High compression piston) by macgi77

Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies

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.