VP Fuels U4.2 and MRX01 Opinions

I am still searching for opinions on U4.2 and MRX01 fuels, as I need to order one of these days since they stopped making U2. Any and all fuel specific insight is appreciated.

Thanks!

Any leads on old stock U2 in the md/va/pa/wv is appreciated too!

big fan of vp street blaze 100 unleaded ....dont like the crap u4 leaves in my carb

what are you wanting to use it in?

neither has enough octane for a modded 2 stroke.

I dont know of any u2 around, but i know of about 25gal. of u4 right up the road from me. If you are interested let me know. They are taking offers on it:thumbsup:

what are you wanting to use it in?

neither has enough octane for a modded 2 stroke.

We spoke before, but still looking for more reviews. Anyway, MRX01 with 98 octane, and U4.2 with 102 gets me to where I need to be. Both fuels, with the nod to mrx01 for being dead on, meet my requirements for a modded yz250. No sure why you think neither is high enough... please explain.

Again, any input/opinion on either fuel.

Thanks!

I dont know of any u2 around, but i know of about 25gal. of u4 right up the road from me. If you are interested let me know. They are taking offers on it:thumbsup:

Thanks for the info. I am really after u2, and if no more can be found, I will go with mrx01 or 4.2. According to vp's specs, u4 is too low of octane for my needs, and is different than 4.2- if I recall correctly, u4 is in the low 90s for octane, and I need 98-100 for my application.

Thanks!

Why not consider VP C-12, tried and tested, One of the best and consistant fuels VP has ever made.

I used that in the past, and really liked it! The reason I do not use it now is b/c I want to continue to run oxygenated fuels...

That U2 is potent stuff. When I used that I would have to drive with the windows down in my van. The fumes came out of my sealed gas can unlike anything I ever experienced with C12.

I used that in the past, and really liked it! The reason I do not use it now is b/c I want to continue to run oxygenated fuels...

I use the U4.2 and it is a lot easier to deal with then the U4. It requires little or no jetting but where I buy it here in Washington I pay about $85.00 for a 5 gallon can. We run it 50/50 with premium pump gas on a stock YZ250F mainly for the oxygen. It runs really good on this mix. I would think that the 102 octane rating of the U4.2 would be just fine for a moded bike. Just my input. :busted:

Yeah, next you won't be able to buy a 2stroke in Cali..:busted:

Oh Eddie, say its not so....

Although my 06 CRF450R is stock, my sons 07 KX85 is not. However I haven't done much to engine but milled the .020" and cleaned up the ports.

So what can I use that both can run on a 50/50 blend?

I had been using VP's C12 w/Chevron 91 pump gas.

There is a bazillion fuel makers out there.

Sonoco

VP

Torco

Trick

Rocket

ERC

F & L

Cam2

Kemco Red X

Klotz

ELF

Cool Skunk

And a cool octane calculator for mixing to a desired octane

i'm running whatever sunoco has at 50/50 for my trials bike. there race gas (not always easy to find) is 110 and 112 depending on the stuff you get.

Any other 4.2 or mrx01 opinions?

From the VP website. maybe you already knew this or maybe you didn't?

I hope it helps.

-----------------------------------------------------------------------------

MRX01

Recommended for 2- and 4-stroke applications. Delivers up to 6% more power than pump gas and any basic nonoxygenated racing fuel. Excellent for high compression road race applications. Can be mixed with MR9 to raise octane level for specific applications. Clean burning — leaves intake and exhaust valves virtually free of deposits for maximum airflow and performance from start to finish. AMA legal except Supercross and Outdoor Nationals.

* Color: Pink

* Oxygenated: Yes

* Motor Octane 98

* Specific Gravity: .717 at 60° F

-----------------------------------------------------------------------------

U4.2TM

The latest generation of our U4 based fuels, this fuel is a direct pour-in replacement for pump gas, with little to no jetting changes required - +2 main jets and +2 pilot jets at the most. Makes power equivalent to U4 with no sticky residue and a less pungent odor. Designed for stock and modified 2-stroke and 4-stroke applications. U4.2 passes AMA amateur fuel rules and is perfect for club level racing, CCS, WERA and AFM. U4.2 makes up to 6% more power than pump gas.

* Color: Blue

* Oxygenated: Yes

* Motor Octane 102

* Specific Gravity: .784 at 60° F

Thanks for the info! I found a few pails of u2 north of me, and just picked up another 30 from Lees Performance in Newport News. Thanks for the leads on the fuel- looks like I am stocked for a bit!!!

:thinking:

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now

  • Similar Content

    • By doniton2
      anybody running the gut buster 24 this weekend? It looks to be a good ol mud race.  http://www.thegutbuster24.com
    • By Bryan Bosch

      Rockstar Energy Husqvarna Factory Racing Star battles Through All-New Format Hell’s Gate to Finish Second
      February 11, 2018 – (Motor Sports Newswire) – Rockstar Energy Husqvarna Factory Racing’s Graham Jarvis has earned a strong second place at the 2018 Hell’s Gate extreme enduro. With an all-new format for this year, concluding in a 20-minute sprint race, the event posed a fresh challenge for the five-time winner.
      For the first time ever, the event kicked off with a Prologue race on the Friday night. Designed to set the starting order for Saturday’s race, the Prologue was an endurocross style event held close to the hosting Il Ciocco Hotel. Although it provided a great spectacle for the fans, the race results were eventually scrapped due to issues with the course.
      Saturday’s heat race went well for Jarvis. An expert at managing his pace, the Brit did exactly what he had to do over the five-laps, finishing fourth aboard his Husqvarna FE 250 in the cold conditions of the Tuscan hills. The position gave him a good start for the night race, which saw riders set off at 3.30pm for a tough three-hour multi-lap event.
      At the conclusion of the night race, the top-10 riders were given a 15-minute break before contesting the new 20-minute endurocross in the arena area of the venue. In freezing conditions, the riders fought bar-to-bar in front of the record-crowd of spectators to decide the overall winner. With the final results calculated on the sum of the previous legs, Jarvis was announced as runner-up, just a few minutes behind eventual winner Mario Roman.
      Graham Jarvis: “I really enjoyed the racing today, I always do here at Hell’s Gate. It’s been a tough couple of days and I’m still getting used to riding the 4-stroke, but the bike has been absolutely faultless over the entire weekend. It has been pretty close between the top-four all day and it’s all come down to the final 20-minute race off. It would have been nice to take my sixth win at the event, but I’m happy with second.”
      Results – Hells Gate 2018
      1. Mario Roman (Sherco) 3:06:03
      2. Graham Jarvis (Husqvarna) 3:08:57
      3. Travis Teasdale (Beta) 3:12:45
      4. Diego Nicoletti (Husqvarna) 3:32:14
      5. Sonny Goggia (KTM) 3:39:26
      6. Michele Bosi (Beta) 3:46:15
       
      Husqvarna Motorcycles North America, Inc.
      Husqvarna has continued to expand its professional race team to compete in AMA Supercross, AMA Pro Motocross, AMA National Enduro, GNCC, AMA EnduroCross, and AMA National Hare & Hound championships. Husqvarna team riders are competing aboard Husqvarna FC 450, FC 350, FC 250, FE 350, TC 250 and TE 300 models.
      Rockstar Energy Drink
      Rockstar Energy Drink is designed for those who lead active lifestyles – from Athletes to Rockstars. Available in over 20 flavors at convenience and grocery outlets in over 30 countries, Rockstar supports the Rockstar lifestyle across the globe through Action Sports, Motor Sports, and Live Music. For more information visit: www.RockstarEnergy.com
      Source: Husqvarna Motorcycles GmbH

    • By deanmellor
      My top end went on m 98 cr 125, the needle bearing clip came out and broke apart and shrapnel got everywhere and blew it up. I cleaned out the top end and washed out the crank with the bike upside down. the bike starts up great and seems to run fine but im getting a weird di-di-di-di-di-di-di noise coming from the motor. i tried adjust the power valve and tightening everything but the noise is still there. Here is a link to a video where you can hear the sound. It gets louder as rpm's get higher and at really low rpm barely idling it goes away. I am pretty new to bikes and 2 strokes so any help would be appreciated.
      https://youtu.be/msfU8WCXg8E
    • By RidingWithStyle
      In need of Cycra Handguards (probends) for my bike. Need 1 1/8 clamp size for renthal twinwalls. Message me if you have any for sale at a good price! 
    • By Baja Designs
      Hello CRF450R Owners,
      Bailey here with Baja Designs.  We recognize ThumperTalk as one of the go-to sources for information on the CRF450R and we receive emails daily regarding the best inexpensive light setup or purchasing the B1K setup ran by Ox Motorsports.  We would like this thread to be a General Discussion area for members and guests to discuss Dual Sport Kits (DSK), Lights, and Lighting Acessories based upon stock and modified charging systems.  Please Post up if you have any questions or comments CRF450R related! 
      www.bajadesigns.com