Factory mod 800 nonves questions?

[farmervanny]

I have an iqr with a factory non ves 800 in it. It has not been ported, but is a factory mod motor from polaris, or so I was told. It has Decker twins on it, with an stinger id of right around 29 or 30 mm. I am in the process of setting the sled on a 146 track/skid combo.

My main question is what you think the ideal rpm would be... I have looked at various dyno charts, but obviously non are availiable for the decker pipes.

Anyone happen to have a good base set up for clutching at 10,000 plus feet? Right now with the short track it only pulls about 7600, but I haven't gotten into the clutches to check out whats there.

 

[rdr99]

With twins on, probably 7900-8100 rpm.

 

[bowman racing 45]

I am currently running a 800 ves SLP motor in my IQR with a 159 track and it runs the most hp at 8200 rpms and i am running 62 gram polaris weights with a 52-46 helix and a red black spring