CV4 High Pressure Radiator Cap

i ride a 2011 200 xcw in the mountains and this cap keeps it from blowing antifreeze out.

-m-2011 KTM 200 XC-W--

Definitely solved my cooling issues on my 450 with this cap engine ice and a new water pump

I haven't really tested this cap out on a hard ride yet but it seems to keep coolant from coming out of the overflow tube when the bike get hot.

-m-2017 HONDA CRF450R--

This is the fastest and least expensive way to improve your cooling system effectiveness.
I’m looking forward for the summer time to be able to judge even better the improved capabilities .
0.4bar extra is 25% more pressure in the system compared to the standard one.

-m-2008 KTM 300 XC-W (E-Start)--

Great product!! Fits good. Never had a issue with it. Have about 60 hours on it. Looking for a good cap look no further than this!

I've owned several of the CV4 high pressure caps in the past and they have all worked great. If you're cooling system is on the edge of boiling and steaming in tight technical spots this cap will usually take care of the problem by raising the system pressure.

-m-2018 KTM 300 XC-W (E-Start)--

I ride in high temps through rock gardens and occasionally slog through deep sand and silt and these caps are mandatory. They can get you home without boil overs and runs dry even without radiator fans and coolant catch cans in the worst high heat conditions. The very best thing you can do right up front to heat proof your bike.

-m-2018 HUSQVARNA TX 300--

I was having some overheating issues with my 12 350. The fix was as simple as installing. If your overheating, try this first!

I noticed my cooling fan coming on frequently with the stock radiator cap. After I swapped out the stock cap with the CV4 Radiator Cap, I noticed the fan does not come on unless it's really hot (+90 Degrees), I'm climbing, and moving slowly. No boiling over, and coolant level stays full. This is a must to keep your machine running cool. Heat kills your power and wears on the moving parts.

I tried this on my 2007 sx-f 250 hoping it would help with overheating problems. So far it seems to have fixed it..... I like to ride a lot of single track, and blaze new trail wherever I can. Now I don't have to keep shutting my bike off to cool it down....

-m-2007 KTM 250 SX-F--

Seems to work just fine I haven't over heated the KLR and have not lost a drop of coolant in 1,800 miles even in a 2 hour traffic jam stop and go.

-m-2017 KAWASAKI KLR650--

Works great and install is easy and it's a good upgrade to your ATV or UTV I have one on my RZR and I also have one on my 700 raptor

-m-2013 POLARIS RANGER 900 XP--

Fit perfectly, did the job i was happy with the outcome. My bike overheated because i didnt have one.

It's 100% doing what it is supposed to do. That means 100% satisfaction.

When ever any of my customers have over heating issues I always recommend this cap and have great success. I am reviewing this product for high altitude riding and very technical riding.

Works well. Easy to install. Does what it's supposed to do. A little expensive for what it is.

Does what its suppose to. Even looks good. Bought it because stock one would open too early. , originally thought i was overheating the bike.

-m-2008 YAMAHA YZ450F--

Replaced the stock 1.8 bar with the CV4 2.0 to top boiling over on tight trails. Works great and the radiator cap fit my KTM perfectly, great product.

-m-KTM--

Boiled over in the woods and trail blazing thru tall grass. I changed to ice anti-freeze which helped, but this new cap made a big difference. My bike is known to run hot, but problem solved !!

-m-2003 YAMAHA YZ450F--

It's hard to tell how effective this part is because I also upgraded the water pump impeller and I did this early on to avoid boil overs. I'm guessing that the combination of both parts helped, as well as the samco T-stat bypass hoses.
Now and then on hard hill climbs where I'm struggling the bike will steam but I've never had to add more than what would amount to a mouthful of water to it.
I do not have a fan on my bike and would like to avoid that.

-m-2014 KTM 300 XC-W (E-Start)--

Put this on a the same time I installed the Thermobob kit. I installed this cap to help the performance of the kit at higher altitudes and it does wok wonders.

-m-2010 KAWASAKI KLR650--

Great product. Helps prevent coolant loss and raises the boiling point of the coolant.

Between this and Engine Ice my boil over issue was fixed.

Big improvement over the stock radiator cap. Before i had multiple boil overs, now there's one less thing i need to worry about on the track and trails.

Machine this part was bought for: 2006 KTM 250 SX-

I had a problem with my bike boiling over in the summer months at the track. I would lose 1/4 of the coolant minimum during my moto.. The CV4 cap fit just like stock and resolved the problem. No more coolant loss! Well worth the money.

Machine this part was bought for: 2014 SUZUKI RMZ450

I installed the high pressure cap, and have never had an issue with overflow since !

Machine this part was bought for: 2004 KTM 125 S

This cap cured the boil-overs I was having while going slow in tight trails. No issues on the track either.

Machine this part was bought for: 2014 KTM 450 SX-F

Was overheating during extreme conditions during hare scrambles. The little extra pressure provided by cap solved issues.

Machine this part was bought for: 2009 KTM 300 XC-W (E-Start)

had some overheating on some slower paced races because of mud but raising cap pressure seems to have helped ,so far good move no more overheating problems.

Machine this part was bought for: 2014 KAWASAKI KX250

450's tend to run hot, especially on trails. The CV4 cap is cheap protection against a boil over. Highly recommend.

Machine this part was bought for: 2003 HONDA CRF450

You can get the best product at a great price !!!

Part fit and function were just as expected.

Machine this part was bought for: 2007 KTM 525 EXC 4-Stroke

bought the highest pressure cap I could to keep from boiling over. I ride 115 degree summers on tight trails and haven't had an issue since I installed this cap. I know it doesn't lower operating temps at all but at least im not losing coolant making my situation worse.

Machine this part was bought for: 2006 HONDA CRF450R

Works great in conjunction with engine ice or water wetter to keep your bike running cooler

Machine this part was bought for: 2013 KTM 450 SX-F

I had problems with my bike boiling over after long motos but as soon as I put the cv4 cap on, the problem disappeared.

Machine this part was bought for: 2006 KAWASAKI KX250

my bike hasnt leaked coolant since i put this one

Machine this part was bought for: 2014 YAMAHA YZ450F

BUYER TAKE NOTE: make sure you know what the pressure range is for your cooling system. If you raise the pressure too high, you could damage every downstream component (water pump, thermostat, hoses, etc.). The 2014-15 Honda Rancher is rate between 15-20 PSI (1.1 - 1.4 bar). Going any higher is dangerous and could void your warranty if you blow the cooling system due to high pressures. I bought the 1.4 bar CV4 cap because that's still within the pressure range for my ATV (20 PSI). Couple this cap with Engine Ice coolant, and my ATV never goes above 2 bars on the temperature gauge. None of this makes the engine run colder - that's dangerous - but it does enable it to run at the optimal temperature consistently across various types of riding. I ride on trails that don't allow high speeds, so the radiator fan used to come on all the time and the temperature would spike. Now, it runs very efficiently. Well worth the small cost. Make sure you do your research before putting a high pressure cap on your ATV. Higher pressure isn't always better, even if it does prevent "boil over."

Machine this part was bought for: 2014 HONDA Rancher 420 AT 4x4 IRS

This cap keeps the coolant where it belongs - so much so that I removed the overflow bottle from my WR. Even in the heat of summer with some slow-speed trail sections, it doesn't lose any coolant. If you go this route, just be aware that it puts greater pressure on the rest of your cooling system seals and components. No issue for a healthy system.

Machine this part was bought for: 2011 YAMAHA WR450F

It does what it is intended to do. It raises the boiling point of coolant. The only complaint is that it is a real pain to turn to remove. It is on very tight. I usually put on a pair of mechanics gloves to get enough grip to turn the cap.

Machine this part was bought for: 2015 KTM 300 XC

This worked well to slow the puking coolant issues I had. Combined with Engine Ice it worked even better.

Machine this part was bought for: 2013 KTM 450 XC-F

Haven't overheated yet since I put this cap on! CV4 offers a 1.4 and 2.0 bar cap. I went with the 2.0 because I run woods races and that's the last thing I need is to loose coolant. Costed me a top end earlier this year so never again will I run a stock cap...

Very good quality cap, that seems to have helped my gnarly trail riding boil over problem. Thumbs up!

Machine this part was bought for: 2014 KTM 300 XC-W (E-Start)

Hope I don't have to test its full capability

Bought this because bike was running hot. Put on the new cap runs a lot cooler awesome.

Machine this part was bought for: 2009 SUZUKI LT-R 450 QUADRACER

This cap is ideal if you want to increase the pressure of your cooling system to reduce boil-over in hot conditions. Perfect fit and bike never boils over, even in summer while riding tight woods.

Machine this part was bought for: 2013 KAWASAKI KX250F

does what its supposed to do.

Machine this part was bought for: 2009 HONDA CRF250X

Looks like a quality piece and has worked flawlessly.

Fits right and easy to install.

Machine this part was bought for: 2012 YAMAHA YZ450F

This is a must have item for any 4-stroke.

Machine this part was bought for: 2015 KTM 450 SX-F

I haven't lost any coolant since I put this cap on. Raises the temperature before you boil out of the radiators.

Machine this part was bought for: 2011 HONDA CRF450R