great, more info! nope, no clutch mods were done. i bought it from a guy in ok (1400ft), and took it to colorado (my house is 5400ft). I ride from about 7,000ft to about 12,500ft. are the 10RH weights for high altitude? any experience with aaen? looks like they have a lot of parts.

mike

 

Mike, have you made any of the suggested mods to your quad? If so what kind of performance changes did you notice?

 

Sorry, have not done much. I was looking for someone to say "i did this and it worked well" but not many seem to play with the 500 EFI's. I did install the high altitude weights last weekend, and will try them out this weekend (was riding at 10,500 - 11,5000 over the 4th). Did the 3 headlight mod, and installed the switch and bulbs for the work lights too. Measured the inlet size of the intake for the air box and it was about 1 cubic inch smaller than the throttle body. Didnt want to cut it back to where it was larger and reduce the water depth that I could go through. Havent come up with a fix for that yet. Maybe fix that and to a uni filter or something at the same time. Let me know if you try anything.

Mike

 

So how did the high altitude weights work out?

I talked to Rick Ritter and he said that was the most important thing to do. How big a deal was it changing out the weights yourself?

I did the 3 headlight mod also, but it doesn't work consistently (might be because of the HID conversions) even after soldering all connections in place.

Someone recommended a power commander, but I can't find a model for the 500EFI. For more power might be best to get an 800 or the new 2010 850 XP Touring. If I get this issue resolved I'll be happy with the balance.

 

I had the weights changed to the high altitude a couple of weeks ago, and after a few days in the mountains, they made a huge difference for the better.