doo 800 twins at elevation

[trevor_zr600]

well guys im goin to revelstoke in march but i have a set of the doo twins on my rev 800 with some other minor work done to the engine im wondering what can i doo to run them at 6500-8000 feet for a week or do i go with a stock single pipe. someone help me please because no one on dootalk wants to help me out.

 

[Tdubbs]

I've been struggling with that same question with a buddies summit all winter..We've got it pretty close now...200/380 primary spring, doo purple secondary...goodwin aluminum pins with about 7 grams on clicker 3 to start adjust from there to pull 8600 RPM, and a 47/44 helix...have fun..

 

[SnowSnob]

Go with the single. Not many have had much luck with twins on the HO at elevation which includes me. You can get Crank Shops to run with the right port timing but the race doo pipes I've heard just don't work up high.