2 replies to this topic
  • 116CJ

Posted June 05, 2006 - 04:40 AM


Thinking about picking up a yz450 and switching to a 4 stroke finaly. i have probly 25 gallons of vp red left, is this bad to run in the engine or do i need to use it all up before i go out and get a 4 stroke?

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

Posted June 05, 2006 - 07:23 AM


Use it up, sell it, or burn it in your car. VP Red is listed as an all purpose fuel, but the vaporization rate is formulated for a carbureted V-8. As such, it vaporizes too slowly for optimum performance in a 4-stroke motorcycle engine with an extremely short intake tract. You would end up having to richen the jetting well beyond the level required for pump gas, or even U4, in order to compensate.

Besides, the octane is far higher than needed. A YZ450 needs no more than 91 (by the (R+M)/2 method), and good pump premium is at least that. If you want to use a race gas, get one like U4 (92 motor octane) that's blended for the purpose.

  • 116CJ

Posted June 05, 2006 - 07:45 AM


cool thanks

Related Content


Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies

Yamaha YZ450F 2017 by Chris.GVS

Yamaha YZ450F 2017
  • - - - - -
  • 0 reviews

First Hare scramble tips by dhend8

Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  33 replies
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 replies

Megabomb Fitment by 288yz450

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

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.