PAR Head

[Nramaker]

looking for some insight on a PAR head that i acquired last winter. i have a 2013 pro 800 that i want to put it on.

The only numbers on the head are on the top on the dome. ( 36.5)

Has anyone had good luck with them for starters? i ride in higher elevations. Do i need to run a mix of race fuel and premium? programer? any input is much appreciated.

 

[The Bob]

I believe those are 13.6:1 domes. I think if your riding above 8000 ft they are fine with pump gas. I think 37.5cc is 13.1:1 or there abouts.

Very good heads, kicking myself in the *** for selling mine, and the extra domes I had.

 

[Turbotater]

That should be 13.6:1 ratio.
Higher elevations on pump premium no ethanol should be fine.

 

[polaris910]

PAR heads are now MDS Clutching 36.5 is 13:6 7,000ft. and up, check out the website www.mdsclutching.com and click on 800 heads.

 

[Quinlan]

I've had a PAR head on my '11 Assault for a couple years now. I got a good deal on it used. It seems to run a little crisper with it. I am, however, only using the 12.5:1 due to lower elevations I occasionally ride; 91 non-eth only.

 

[damx]

I ran the par. 12.5 head on my 14.(0-4500') With mds weights, was able to run 2.5g more in the bottom hOle and 1g more on the tip then stock. At the same rpm.