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[QUOTE="Studboy, post: 568648, member: 26867"]
Alright, so here is the scenario.

I just purchased a 2002 YZ250.&nbsp; After playing with the jetting a little bit I REALLY like the way the bike performs now. (MODS: V-Force 2, Doma Pipe&amp;Silencer.)

I am at approx. 4,000 ft and I usually run premium pump but occasionally when I feel like getting serious :) I run some race gas. (I change my jetting of course.)

So my question is:

1.&nbsp; Would I benefit from getting my head modified for pump premium just because of my altitude?&nbsp; And will this kill my overrev?

2. I also have a VHM Head (The one with interchangable domes.) With a dome that specs at:&nbsp; Piston Height 2.80 mm&nbsp; Volume 20.60 cc and Squish 1.50mm.&nbsp;&nbsp; I haven't tried this out yet.&nbsp; I can also get other inserts made up if I want to.

What is this going to do for me? (I assume I'll need to run race gas.)&nbsp; I don't know much about the whole squishband/head thing so any information pertaining would be helpfull!

Thanks a lot!&nbsp;  :worship:
[/QUOTE]

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