Valves gone at 3700 miles?
Posted November 27, 2009 - 03:23 PM
My question is why did this happen. I know most folks are getting two or three times this mileage without valve issues. I run a twin air filter, normally use PJ1 or Bel Ray spray filter oil. I clean the filter every couple of rides. Air box always looks clean. In the area I live (alabama) almost all the gas has ethanol, so that is what usually goes in the tank (93 octane).
Mods to the bike are chopped up air box, JD Jetting (summer - 45 PJ/162 MJ; winter - 48 PJ, 168 MJ), FMF 4.1, Rekluse clutch. Bike doesn't pop on decel, so I don't think I am running lean.
Also looking for recommendations on a shop to rebuild the head and hone the cylinder.
Posted November 28, 2009 - 08:34 AM
As for a shop, ask around to see who does the head work for the local dealers, or try Engine Dynamics, or Millennium Technologies
Posted November 28, 2009 - 06:14 PM
Posted December 01, 2009 - 02:56 PM
Have you been on the rev limiter a lot?
I beat the piss out of my 450's and got > 15,000 miles out of a set of valves. Somethings up to cause a a failure this early. My guess air filter or lean jetting but I think it would have to be very lean and by your numbers that doesn't look likely. Are you getting the bike real hot or boiling over regularly by chance?
Posted December 01, 2009 - 05:12 PM