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Wondering if anyone has used or is using a high pressure radiator cap. If so, did it help with boil-over? Did it cause any problems ( seals, hoses, etc.)
I'm considering trying one due to my 220 boiling over at the most inconvenient times..

We haven't put one on the KDX yet, but we did put a 1.6 on our KX103 stroker, and it did stop the coolant loss.

No ill effects were ever noticed in two years.

I've had a 1.6 on my 220 for 3 years. No problems. Stopped boil over and coolant loss. The 1.6 cap came from a KX 500.

Thank you for the responses. I ordered a 1.6 cap. I will post the results.

The original cap will get weak over time. This has solved lots of overheating problems.

I went with a 16lb cap on mine. If I lug it hard enough it will still boil over but not nearly as bad

Part number?

Slick_Nick wrote:Part number?

I'm sure YOU can find one at the junkyard or the dump

Mr. Wibbens wrote:

Slick_Nick wrote:Part number?

I'm sure YOU can find one at the junkyard or the dump

Ok, be nice to the kid. I used a 1.6 cap from a KX 250 for a few years without any problems. I then switched back to stocker. What I found is that my original OEM was just worn out.

I have also tried a lot of different coolants. Engine ice works pretty good. Despite all of my efforts, I still had occassional overheating. Then I realized that some of my fins on radiator were bent pretty good so you might want to check that.

I think the ultimate coolant is Zip Ty - Evans Cooolant NPG R. Get it directly from Evans because its cheaper. Its a waterless coolant. I have used all summer without loosing a drop. The only concern is the added heat to your engine. Most water based coolants boil around 212 -220 degrees. Evans pukes around 350 degrees. I am a little concerned what the added heat might be doing to the engine so it will be interesting to see what the top end looks like this winter. I a really paranoid about the extra heat - using temperature stickers for what they are worth . . Even on a bad day of slow muddy hill climbs, my temps got no higher than 235 -240 degrees. So its controversial but I wanted you to be aware of other options.

Fact is... you should not be having an overheating problem that requires that high dollar coolant. I will not buy it period. I use Peak 50/50 and don't overheat at all.... If your system is right.... you shouldn't overheat except in rare occasions where you are really working the bike in a very nasty climate.

Indawoods wrote:Fact is... you should not be having an overheating problem that requires that high dollar coolant. .

Easy to say when you live on a pancake

Same results in the mountains of West Virginia.... no difference and I was flogging it pretty good....