Racing fuel bad for carb?

3 replies to this topic
  • yz400fl1

Posted December 07, 2004 - 08:39 AM


I was just cruisin' TT and read the the resent post yz400 hp, and read the review of the 98' 400f http://www.motorcycl...yam/yz400f.html. I found one part that said that racing fuels hurt the carb. I have a 99' 400f and have been running VP 110 leaded for the last year. The bike runs better than new. And I asked the dealer they said they didn't know except that the leaded is good for the top end. Anyone have opinions on this?

  • yz400fl1

Posted December 08, 2004 - 06:46 AM


Nobody knows?

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  • 642MX

Posted December 08, 2004 - 05:05 PM


All I know is I've run Citgo 110 leaded for a long time with no problems. I heard lead cushions the valve against the seat, I don't know if this is true or not. As far as carb problems go, I've never had any troubles, never even had the carb off my bike or changed any jets.

  • Silver Surfer

Posted December 09, 2004 - 04:31 PM


the original purpose of leaded fuels, before they came up with hardened valve seats, was to create a better seal around the valves and the seat. with better metals, and tougher emissions laws, we now have unleaded gasoline.

i don't think your carb will be affected...but this thread has some GREAT info...

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