Jump to content
Sign in to follow this  

2-stroke premix advice(Premium from pump or 110 octane RG?)

Recommended Posts

Okay so i finally finished rebuilding my 2000 CR 125, ive been told by some other riders to run 100 or 110 octane race gas, so i went out and bought some 110, cost me $60 for 5 GALLONS :confused: so now im trying to figure out whats the lowest octane you can run in a two stroke? i believe the highest you can get at the pump is 92 octane but im clueless if that will work? Since i just rebuilt my whole engine i really do not want to mess it up. Much education needed here!

Thanks.:thumbsup:

Share this post


Link to post
Share on other sites

i run 93 octane from pump and it works fine...if you have the money to buy race fuel go with that

Share this post


Link to post
Share on other sites

YIKES....110 is expensive in California !!....I run a mixture...2 gallons of 93 octane...currently $4.51/gallon...and 3 gallons of 110...$6.56/gallon...works grea in my YZ 250....plenty of octane and cheeper than straight 110...

Share this post


Link to post
Share on other sites

god damn you guys have pea soup out there!!! can you not get 94 at chevron?

iv ra 89 in my cr250 and it didnt ping. 92 should be plenty. race gas is really not needed...the lead in it is nice. but, the price...err, not so much.

Share this post


Link to post
Share on other sites

Both of my good riding buddies and I now have to run 50/50 93octane 110 octane mix in our bikes. Just in the past year the local gas all makes our bikes ping, never did before. VP 110 is 7.99 and 93 is about 4.25. So works out to a little over $6 a gallon. You can get away with 93 pump gas if you dont beat on the bike real hard and just trail ride, but at race pace we needed to use something better.

Edit: bikes are my 03 YZ250, an 06 YZ250, 09 KTM200, and my GasGas EC300.

Share this post


Link to post
Share on other sites

Like most have already pointed out, mix 93/with whatever race fuel you'll buy. I go 50/50 and the bike doesn't 'ping' anymore.

Share this post


Link to post
Share on other sites

You probably don't even need 50/50. 3-1 or 2-1 pump-race should be fine.

Share this post


Link to post
Share on other sites

Don't know for sure about what gas you have out there. Here in TX our premium pump fuel is 92 octane, with a sticker saying that it may contain up to 10% ethanol. If you are jetted right (VERY IMPORTANT!!!) that is fine. On 2 smokes the only reason to run race gas is if you have done piston and head work to up the compression.

I have run pump gas mixed at 32:1 in everything from KTM 50's up to my CR250 and never had a problem. And we ride in 100+ degree temps at times. As long as you are at stock compression, if you are pinging, go up a jet size. Also make sure that bent radiator fins are not letting your bike get too hot.

At stock compression, these bikes are designed to run on pump gas.

Share this post


Link to post
Share on other sites
god damn you guys have pea soup out there!!! can you not get 94 at chevron?

iv ra 89 in my cr250 and it didnt ping. 92 should be plenty. race gas is really not needed...the lead in it is nice. but, the price...err, not so much.

Different regions have different octane levels. Premium gas is Premium gas.

Share this post


Link to post
Share on other sites

Most bikes are fine with pump gas unless you have worked the head to bump compression. I would try high test pump gas 1st and listen for pinging when under a load. Sunoco sells 94

My YZ250 smoker I have to run the 3 gal Race and 2 gal high test pump gas......my 450 is fine with just pump gas.

Share this post


Link to post
Share on other sites

All this input helps alot thanks, but yeah out here in CA Sunco 110 is going for 60(tax included) for 5 gallons. so im really trying to cut the costs.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

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

Reply with:

Sign in to follow this  

  • Similar Content

    • By fudgypup
      Garrett Poucher and Skyler Howes of Garrett Offroad Racing are headed to Dakar!  These US privateers are headed there for their first times but Skyler is fresh off a victory at last week's Baja Rally, won the Sonora Rally in March and this team placed third in the Baja 1000.

      They have a fundraising link set up and could use your help.
      I raced with Garrett at Baja Rally last year and then both of them at Sonora and was honored to pit with them as well.  They're both super guys and work their assess off.  I think they both have good chances of not only finishing the 11 days of Dakar but placing well.
      They're doing some rally training events this Sat, Oct 20 in Santa Clarita, CA and then another Oct 28th in St. George Utah so if you've ever considered learning rally raid navigation, this is your chance!  It's a lot of fun too.  More info on that at the link.
    • By Big64N
      Good condition with a long list of high end upgrade parts.
      Rekluse EXP 3.0 with cover and slave
      EVO- Ellensburg suspension tuning for 6' 200# expert rider
      Fork bleeders
      Trail-tech map switch
      Moose 1-1/8 flex bar
      CYCRA probend bar guards
      SXS skid plate with linkage plate
      Clutch and water pump guards
      Frame guards
      Fastway Evolution III pegs
      SRT Pro Armor radiator and rear rotor guards
      Acerbic Front rotor guard
      TM designs chain guides
      DID race chain
      Renthal sprockets
      Gripper seat
      FMF F-bomb header
      Dirt Tricks timing chain tensioner
      Pro Wheel, wheels
      Tubliss front and rear
      New top end and valve adjustment 60 hours old
      Many more aftermarket parts as well as spare parts and service manuals included in the sale.  Willing to include 4 sets of tires with 80% tread left for full price.
      Great bike with plenty of life left and set up for anything from single track woods to wide open dessert.
      Can hang with any of the 450's but is much easier to handle in the tight woods.
      Priced to sell at $6000.00 
      Willing to consider reasonable offers but no trades or carry.
    • By filterx
      34 Days and what ever in Beautiful Chile
      http://www.fim-isde.com/home/
    • By Project57
      So if I can’t buy a used bike from out state looking for anyone that has or knows of a low mileage California 2017 / 2018 Beta 500 RRS?
      Thanks in advance!
    • By Project57
      Looking to buy a used Beta 2017 500 RRS from outside California.  Can I plate (Register with CA DMV) the bike in CA?  If so what is the best way?  Don't have the money to put down for a new bike from a Dealer in CA.  Any help or sugguestions would be appreciated.  Thanks in advance.
×