4 replies to this topic
  • deerman2701

Posted June 01, 2011 - 08:23 AM


So my yz426f runs super hot out the pipe and head when i run the bike with the choke off, but if i run it around with choke on the bike runs cooler...

so should i up the main jet? i already upped the pilot.

the main in it right now is a 162s? i have no idea what the s is or if thats a big jet for that bike i just got it...

it has hotcams and a pipe on it. i live in pittsburgh so i live at like 1000 elevation.

  • grayracer513

Posted June 01, 2011 - 09:23 AM



Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • deerman2701

Posted June 01, 2011 - 11:43 AM


i see that i have the stock jet in my main then... 162s great. prolly burning my valves...

i see people going either to 165-170 what should i go with the 170 first?

  • grayracer513

Posted June 01, 2011 - 12:17 PM



  • deerman2701

Posted June 03, 2011 - 11:04 AM


wow i noticed people running stock pilots or a 45... the bike has a 48 pilot in it now

should i go down to a 45? and up to a 168?

Related Content


BIGBORE FOR YZ450F 2006? by Taattie94

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

Megabomb Fitment by 288yz450

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

Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 replies

Should I buy this bike? help....... by Numsa Hul

Dirt Bike   General Dirt Bike Forums   What bike should I buy?
  • * * * * *
  • 10 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.