Petrol & oil additives to help performance

Discussion in '4-Stroke Engines' started by mifletz, Nov 24, 2009.

  1. mifletz

    mifletz Member

    Is there any petrol or oil additive that would make any worthwhile difference to the performance of eg a Robin?

    Or are they all a rip?!


    Id've thought that if they work at all, it would be in the performance of a marginal small bicycle engine that the effects would be most noticeable to a rider.
    Last edited: Nov 24, 2009

  2. Mountainman

    Mountainman Active Member

    much written around here regarding these products

    when my robin had a slight miss Sea Foam got it back up smooth

    what was the problem -- I am not sure

    if the THINGS running good you are wasting your money buying those
    and if not they will probably not help anyway

    and with a Robin an octane boost may not be a good THING

  3. You don't need any of them. Use an excellent quality oil, after a short break in period. Change the oil often since there is no oil filter in the system. Octane boosters are a waste of money and may actually hurt performance as high octane fuel atomizes poorly, especially at lower temps. The compression ratio is 8.5 to 1, so 87 octane unleaded fuel is perfect. A few drops of a fuel additive such as seafoam every few tanks full will keep the carb clean, more (per label) if the bike will be stored for a short while. If the bike will be stored for a long period drain the gas tank, run the engine till the carb is dry, change the oil to remove any combustion acids that have accumulated in the oil, and squirt a few drops of oil through the spark plug hole rotating the crank to lightly coat the cylinder and replace the plug to keep moisture out.

    I use Castrol Syntec 10W40 oil and buy my fuel from a busy gas station. Gas stations where the gas sits in the underground tanks for long periods without being refilled absorb water moisture and may become dirty.

    The Robin is a very well built engine and will give you years of good service with proper maintenance. Read and follow the manual and you will be fine.
  4. Mountainman

    Mountainman Active Member

    Or are they all a rip?! (( no )) they do boost octane

    Or are they all a rip?! (( no )) they do boost octane
    that is not what one wants regarding a Robin
    at one time past I was talking with a Robin rep
    mentioned to him that maybe I would move up to a higher octane
    from like 87 to 89
    he asked me why I would want to do that when it will run best with 87 ???

    made me feel pretty silly !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    my Robin THING has been riding fine for a long dong time
  5. Silvaire

    Silvaire Member

    The only fuel addative that I would consider would be something that would keep the fuel from going bad or from damaging carb parts and fuel lines.

    The Walbro WYL carbs that many of these little engines use (and other Walbros, of course) have rubber diapharagms that get brittle and curl from what I think is the alcohol in auto fuel. Perhaps something like Stabil might help?
  6. Helping your engine

    Hello guys, I have ridden a couple of Robins but do not own one. I ride the more powerful Honda GX50HA and the HS 142F 49cc 4-strokes, and Whizzers.

    I have said that in advance so that you-all will know where I come from, now on to real experiences.

    California gas is what I'm dealing with in this post, tho other states may be selling the same garbage. CA gas is no loaded with what some say is a double-shot of ethanol, and a dose of sulfur to raide the burning temp that was lowered by the overdose of alcohol.

    Here are symptoms that I have suffered:

    Gas jelling in the tank

    gas either jelled or a month or two old drying leaving a yellow powder behind

    Carbs coated inside in a nasty yellow color

    my van idling rough

    2 neighbors report the same thing on small-engine cars

    small engines beginning to run rough especially at idle

    small engines that will only run on choke

    finally small engine will not run, starts and dies!

    I short-term fixed my Honda with some carb and fuel-injection cleaner, and did not continue it's use and it starved out again!

    In CA. the "cleaners in a can" will help, probably resolve, and maybe avoid these problems.

    I am happy to have a solution, but hopping mad at the state for forcing the purchase and burning of more chemicals in my engines.

    We truly are being ripped off again, this time in a new way.

  7. Old Bob

    Old Bob Member

    CT has the same emission regs as CA and use the same "gas".
    The only way to survive is to replace rubber parts once a year or as needed.

    The jelling may be a reaction with the "gasoline" additives and the compostion of plastic tanks.Polyethylene tanks seems subsceptible to the geling issue. I haven't seen it gel in a metal tank... yet.
    A pour in urethane liner may thwart the problem.
    Someone would have to test this.

    Being in Sacramento you may have received a batch of winter grade gasoline, when did you notice this?

    (you guys think things are bad now, read up on the Copenhagen Treaty, siging it must be stopped at all costs)
  8. Trouble jelling

    Hi Bob, no it was summer when the YIT hit the fan in my tank. Also, my tank is steel. This carp they pass off as gas, is not as pure as what you get when a dairy cow first stands up in the morning!

    I ran into this in 90 degree plus weather, getting ready for the fall Whiz-In

  9. Nuttsy

    Nuttsy Member

    Hi guys,
    I'm in Florida and have also had problems with the small engines (2 of 3 of my yard machines) starting to only want to run choked or semi-choked. My son also had gelling in his fuel tank when the car sat for a month while he built a new motor for it -- metal tank; garbage fuel.
    I regularly run Marvel Mystery Oil through my vehicles and will probably start on the small engines too. Stabil goes in every can of gas for the yard equipment/bike fuel too.
  10. Stabil and Sea Foam are both additives for gas that keep it good for extended periods of inactivity. I think the formulas are likely similar. Neither will hurt in reasonable amounts and may help.

    So far (fingers crossed) the gas here in Northwest Pennsylvania has been okay. I would avoid 85% ethanol fuel (E-85) like the plauge
    Last edited: Nov 25, 2009
  11. Old Bob

    Old Bob Member

    Interesting, and good info too.
    I suspect I use my fuel at a fast enough rate to not see any problems.

    I'm collecting info on the gel issue, trying to really nail it down, it seems to happen faster in some areas than other and what the fuel is stored in.

    Seen this happen with two stroke premix in plastic cans. Now I'm wondering.
  12. Mountainman

    Mountainman Active Member

    gel issue

    a ride or two back I noticed in my almost empty reserve gas tank
    some funky gel looking stuff on the bottom
    tossed it out on the ground not thinking too much about it

    man did not realize in the old days how good the gas was !!!

  13. ibdennyak

    ibdennyak Guest

    What you meant to say is *you recycled it properly* isn't it????

    Guess I am pretty lucky here...our fuel doesn't do that.......yet. :rolleyes7:
  14. Old Bob

    Old Bob Member

    The alcohol additives are at the heart of the problem, certain brands may be more likely to have this issue also.
    Haven't seen gel in Sunoco fuel.
  15. Mountainman

    Mountainman Active Member

    did the kind of right THING

    did the kind of right THING
    poured it on some weeds
    someone would have had to put weed killer on them
    saved just a little bit of the earth once again
    maybe Al Gore will send me a free foot print decal or someTHING ??

    never know -- he got money for noTHING !!

  16. Xandelee

    Xandelee New Member

    I have seen a video on youtube that tests some of this milagrous boosts, all of then resulted in 0% of performance added, except for one that makes the engine lose 2% of the power :snobby: check youtube
  17. spad4me

    spad4me Member

    About four years ago the wonderful fuel suppliers added so much alcohol to the very expensive gasoline.
    It melted most GM brand in tank fuel pumps . The repairs are about $1500.00 per car. Locally there were so many destroyed fuel pumps, You had to wait for the supply trucks to deliver the pallets of GM fuel pumps.
    The Fuel is delivered from Phoenix through a single pipe line .
    Chevron Or generic like 7 11 gas , Both premium and regular comes from the same pipe. Supposedly the difference is a small amount of special additives that justifies the premium fuel price.
    The winter is when the most alcohol seems to be added to the LOCAL fuel.

    A fuel stabilizer might help. If you get bad fuel or water in your gas.
    Good oil like Royal Purple .
    A clean air filter.
    A new spark plug.
  18. ibdennyak

    ibdennyak Guest

    Yep, just being sarcastic there MM. Before we were enlightened we used drain oil to kill weeds around buildings, and to keep dust down on gravel drives. Almost turned into asphalt. Hmmm, come to think of it, They still build asphalt roads. :confused: Must be a different kind of oil they use. Spill three drops of diesel here they break out an entire spill response kit. Booms and absorbent pads, you name it. The pads are amazing things though. Won't absorb water...just petroleum.
  19. mifletz

    mifletz Member

    Last edited: Dec 3, 2009