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Pinging.....

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2006 650, DJ kit, 150 main, 3 1/2 clip position, air box mod, ground header weld, stock exhaust.

So i live at 5300ft ASL, but this weekend went on a ride that dropped me down to about 3000ft ASL with an air temp of 105f+. 5th gear open the throttle and put the motor under load and i can hear the valves ping (pre-ignition):busted:

Any ideas?:thumbsup:

I'm thinking with the hot air temps and lower elevation i was running lean, because when i climbed back up and things cooled i could not duplicate it...:thumbsup:

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Definately the altitude change will do that,just like my bike will load up if I go to a much higher altitude. 2000' isn't a huge change but enough to make a difference for sure. I'd go with 93 octane if you're planning the trip again sometime to see if that's enough to stop the pinging.

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Yeah, i always run 91 (super) anyway, but i'm thinking about going to a 155 main or just raising the needle form 3 1/2 to 4th grove....

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I was running that setup but needle 4th from top and my stock pipe is more restrictive.

Sounds too lean, I would either try different fuel an lower elevations or drop in the DJ155 main if you're spending any time down there.

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If it's only temporarily, you could blank off the airbox mod a bit wth some duct tape. Say 50% of the hole.

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Yeah, i switched fuel twice and had the same event...northern AZ has a lot of elevation changes and my ridding takes me from 3-7000 all the time, guess that's that part of where i ride...

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Gotta agree with Max. Two minutes and a swatch of duct tape cure.

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