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CV4 2.0 Bar Radiator Cap
CV4 2.0 Bar Radiator Cap

$26.99 - $29.99

Description See Also: 17 Reviews 18 Questions

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17 Reviews
4.7 out of 5 stars
5 Star   14 4 Star   1 3 Star   2 2 Star   0 1 Star   0
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All Reviews
Verified Purchaser
Hallsville, TX.
Looks good. Works great.

Purchased as an upgrade for our engine. Cap is on an aftermarket radiator for our Outlaw Kart. It fits perfect and sofar is keeping temps down a out 12 degrees. We have only tested during engine brake in on the stand.

Verified Purchaser
North Carolina
Good stuff

Kx250f. Was boiling over on tight trails . Cap mixed with engine ice and problem solved

Verified Purchaser Top 500 Contributor

Verified Purchaser Top 250
Littleton, NH 03561, USA
CV4 2.0 Cap

Fit and finish is awesome and works great. I use non glycol coolant racing supermoto and this helps raise the boiling point.

Verified Purchaser
So far so good

No boil overs on last ride

Verified Purchaser Top 50
Radiator cap

This cap holds a lot more pressure then a stock and is a good replacement for stock.

Verified Purchaser Top 1000 Contributor
Montana Mountian Rider
2008 WR 450

Factory cap created boil overs. Put this on all gone

Verified Purchaser
Cap Bent

It worked fine for the first day, much better than the stock cap for enduro, but the next day it didn't stand the pressure and got bent. It started loosing coolant through the cap. Then I straightened it and is working ok again. Hope it doesn't happen again. The bike is a 2015 YZ450F

Verified Purchaser
Tuscaloosa, AL, USA
2009 kx450f

This cap is amazing compared to the stock one. the stock one i had a real problem riding in the woods through handle bar trails bc it would boil over 2 to 3 times in a 32 mile period. with the 2.0 i can lug around let the bike idle forever and it will not boil over for the price i will buy to put on every four stroke i get from here on out.

Verified Purchaser

Worked great fit perfectly on my 05 ktm 450 sx and fixed my problem of coolant boiling over

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18 Questions
Answered:   15
Not Yet:   3
Q: What is the dimension on these CV4 caps?
Over 10 months ago
I'm trying to fit the 2.0Bar cap to my MV F3 radiator. It measures approximately 45mm in diameter of the radiator neck flange. Will this work?
Top 10 Contributor
Over 10 months ago
A: Yes the European version will work. I would suggest sticking with OEM MV parts as they tend to run better and happier(MV F4R owner as well)
Q: Will this cap fit my 1985 KX125 ok and work fine?
1 year 6 months ago
Q: What bar is the correct one to get for a 2006 trx450ER quad?
1 year 8 months ago
Q: Is 2.0 bar too high of a pressure for an 02 CRF450?
1 year 10 months ago
I've read at most 1.4 should Ben used but I see quite a few different opinions on the subject. Thanks!
Q: I have a 2001 Husky CR 250. What Cap would I need to run a little higher pressure?
2 years 4 months ago
Expert MotoSport Staff
2 years 4 months ago
A: For your 2001 Husqvarn CR250 you would need the European model cap.
Q: I was thinking about running the 2.0 bar cap on my stock 2008 yfz450. But I was wondering if running a higher psi rating would cause a hose to bust
2 years 9 months ago
Stock 2008 Yfz 450 atv
Expert MotoSport Staff
2 years 9 months ago
A: No you should not have any issues running the CV4 2.0 Bar Radiator Cap on your 2008 Yamaha YFZ450.
Q: I have a 2002 ktm 400 exc, would this cap fit?
2 years 11 months ago
Expert MotoSport Staff
2 years 11 months ago
A: Yes the CV4 2.0 Bar European Radiator Cap fits most KTM and European models.
Q: Which size for a Husaber fe 390?
Over 3 years ago
Expert MotoSport Staff
Over 3 years ago
A: For your 2011 Husaberg FE 390 you would need the European model CV4 2.0 Bar Radiator Cap (CV715-31MK).
Q: Ok so I have a 2008 rmz450 and I'm having a problem with losing coolant coming out of the overflow tube. Will this cap prevent that?
Over 3 years ago
MotoSport Staff Expert
Over 3 years ago
A: Yes this High pressure radiator cap Allows running a higher water system pressure and higher boiling point coolant. I also recomend running Engine Ice Coolant.
Q: I have a yamaha yfz 450r 2011model quad, shall I select European or Japanese radiator cap?
Over 3 years ago
Expert MotoSport Staff
Over 3 years ago
A: You would want the Japanese radiator cap for your Yamaha YFZ450R.
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