Hot start problems 2003 YZ450F

2 replies to this topic
  • PEDale

Posted September 10, 2007 - 07:51 AM


I ride with a bud with an 03 450F and he has a huge problem with hot starting it. is there an adjsutment on the hot start system that is out maybe?

What is the proper hot start proceedure, do you just pull the hot start leaver and hold it till she fires up or do you pull release then kick?


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

Posted September 10, 2007 - 08:15 AM


The base method is to pull and hold the hot start, leave the throttle completely closed, and kick it. You may find in some conditions where it has been dropped or stalled that the bike may want a very slight bit of throttle opening.

Whatever is done, you simply MUST NOT engage in the old two-stroke habit of cranking the throttle each time you kick, because if that is done, the accelerator pump will run the engine full of fuel and flood it completely.

  • 642MX

Posted September 10, 2007 - 07:47 PM


You may try starting it without the hot start. My 426 hardly ever needs the hot start pulled, but my wifes 250F almost always needs it pulled while starting it. Some bikes need it and others don't like it.

Related Content

WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 replies

YZ450F 03 Sparks driving me crazy by SirAttard

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 5 replies

Thinking about Yamaha 250... by Arctic Pride

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies

First Hare scramble tips by dhend8

Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  33 replies

Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  106 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.