Subaru Robin petrol: 95,96 or 98?

Discussion in '4-Stroke Engines' started by mifletz, Sep 6, 2009.

  1. mifletz

    mifletz Member

    What is the correct grade of petrol for the 35cc Subaru Robin: 95, 96 or 98?

    And what is the correct type of gear box oil?

  2. Zev0

    Zev0 Member

    I have over 2000 miles on my R/S and run it on regular grade gas. Oil? I use 10w40 and change the oil every 10 hours of engine run time.
  3. I run regular unleaded gas, as recommended, with no problems. I have used only 10W40 Castrol Syntec since a gentle break in with regular motor oil (5W30).
  4. give me vtec

    give me vtec Active Member

    wow.... you guys get 95 and 98 octane???? that would kick a**. All we get in socal is crappy 91. Not good for high compression engines like those found in imports.
  5. moped-dan

    moped-dan Guest

    I use 87.. this engine kicks butt. For a bike motor I dont think theres any better. They break in pretty quick and once they do they work like a charm.. I took off my muffler today and when idling or letting off throttle it burbbled like a maserati.. it sounded BEAUTIFUL.
  6. Dilly Bar Rob

    Dilly Bar Rob Member

    I lived in europe for a few years and I also noticed that the octane ratings at the pumps were higher then they are here in canada. However this is not because the gasoline is different, here is a quote from good 'ol wikipedia:

    " In most countries, including all of those of Europe, and Australia, the "headline" octane rating shown on the pump is the RON - but in the United States, Canada, and some other countries, the headline number is the average of the RON and the MON, called the Anti-Knock Index (AKI). It may also sometimes be called the Road Octane Number (RdON), Pump Octane Number (PON), or (R+M)/2 "

    If you look at the table HERE you will see that "premium" gasoline in canada/the US labled "around" 93 octane at the pump actually IS 97-98 octane gas (that's what it would be labled as in europe & elswhere).

    I agree with give me vtec regarding imports - locally I can also only get "91 premium", and although my car (92 eagle talon AWD turbo) runs fine with it I do see a small performance increase when I have a chance to fill up with "93 premium" at a out of town gas station that has it. This has to do with with the cars knock sensor - timing will automatically advance as far as it can before knock is heard, the higher the octane the further it will advance.

    To the OP: you should be fine running your engine on "regular" gasoline. You MAY see a little performance increase running a higher grade, then again you may not. "Regular" gas may actually perform better in a small engine as it is easier to ignite. Depends largely on the compression ratio, timing and the load you put on the engine (premium may perform better under high loads). Many honda (and other) cars run high compression (10 to 1) even on "regular" gas, then again as I said cars have knock sensors which will adjust timing automatically. Just give it a shot, won't hurt anything. I tried running "premium" in my HT, made no difference at all, not really a surprise with the low compression ratio (~6 to 1) that these things have.
  7. spad4me

    spad4me Member

    Any thing over 91 is considered racing or aviation fuel and commands a premium price like $10.00 a gallon here.
    How much do you pay for it.

    I down graded a motor so that it can run on 91.
    My happytime runs on any thing
  8. give me vtec

    give me vtec Active Member

    I have a 91 honda crx w/b16a used jdm motor. I used the ecu that came w/ the engine which is tuned to run on 93 jap gas. It ran fine but backfired and popped a little after a hard pull to redline then quick throttle release. I put a couple of gallons of 110 racing fuel from the pump at the track and it made a HUGE difference. The engine was noticably more responsive w/no backfires at all. After I put the new engine in I am going to have it tuned this time.

    Back on topic...
    The eho35 IMO is the best bike motor. 83 octane w/a 30w mineral oil is the best for most conditions. I am running mobil 1 10w-40 in my dads and valvoline 30w in mine... we will see which oil is better in time. Will post results....
  9. HoughMade

    HoughMade Guest

    Call me crazy- I went to the manual.

    All it says is "automotive unleaded gas". Therefore, I would probaly use the cheapest and if it runs fine (and I would be shocked if it didn't), stick with it.

    ...and this brings up up another issue- if people would list their location in their profiles, we could cut through all the froo-frah of people commenting about the octane rating system in the U.S. when, clearly, that is not what we are talking about here.
    Last edited by a moderator: Sep 9, 2009
  10. give me vtec

    give me vtec Active Member

    both very good points...
  11. Happy Valley

    Happy Valley Active Member

    A phone conversation with a Robin Subaru tech support guy a couple of years ago yielded a number of the suggestions to questions I posited. On the octane issue for the EHO35 "regular" was suggested at 87 octane.