Higher pressure radiator cap

I was thinking of running a slightly higher rated cap to help prevent boil over. Anyone run one on thier bikes? Where did you get it?

I'd like to know also....mostly what do the high pressure caps run? I have a 22-25 lb. cap from my XRR (it fits) and was wondering if that was too high?

i have been using 1.8 bar cap since early 06, its a kx80 cap

So a 1.8 is about 26 lbs. What is stock?

I recently got a CV4 20psi (1.4bar) radiator cap thru my dealer......since getting it I haven't been able to go out and ride, so can't comment on how it works.
CV4 also has a 30psi cap which is equivalent to a 2.0 cap.

Just for info/reference:
1.1 = 16psi (raises boil point to 260F) Stock Husky cap
1.4 = 20psi (raises boil point to 272F) Stock on many KTM's & many 2-strokes
1.8 = 26psi (raises boil point to 290F) Read will be stock on 2010 KTM MX bikes, & saw on new Husaberg FE390
2.0 = 30psi (raises boil point to 302F)
That's just the heat it can get to before she blows, does not mean it makes the bike runs that much hotter all the time, or that it prevents it from boiling over, only that the bike can get 30-40 degrees hotter and go longer in hard/slow technical conditions before it does.

The only possible downside I can see to a higher pressure cap is that weak radiator hoses or gaskets (or the stock Husky crossover hose) might blow sooner.
If you have a bike in good condition, w/good hoses/gaskets, no worries.
oh.....also means that when/if it does blow into catch tank, and that then over-pressurizes and sprays hot coolant out the cap vent on your leg, it will be hotter.
(myself, whether I get hit 260F coolant of 302F, I'm still getting my leg the hell out of the way)

Great info RLW....thanks!

been using Evans non-aqueous coolant for 0 boil over, again like stated above the motor temp is the motor temp, this just keeps the coolant in.
PS good graph explanation of bar (= 1 atmosphere 14.7 psi or @15psi) good one thanks.

Are these caps standard fit? Where do you get them?

The standard part, I always wondered about that. Anyway mine is a Kaw OEM KX80 1.8 bar cap, ordered from my home shop.

Heard more than once, that Kawasaki caps fit, and I know when the one of the guys at my dealer tried a KTM cap he had in stock on a new Husky, it did not (KTM cap used on Beta & Husaberg which they also sell)

What I'm "assuming", is there are European caps and Japanese caps....the Husky's for some reason use the latter.
(at least that is the case on my 2005 & the one I new one it saw tried on)

I use Evan's waterless coolant and a 1.6 bar cap for a 2003 KX500 that I purchaced at the Kawasaki dealer. Solved the boil over problem.