Oil Dispenser Inside Happy Time Tank?

Discussion in '2-Stroke Engines' started by 5-7HEAVEN, Jun 2, 2011.

Tags: Add Tags
  1. 5-7HEAVEN

    5-7HEAVEN Guest

    I've been filling my four-liter Happy Time fuel tank at the gas station. Pour two quarts fuel in, pour oil, then fill up with gas. Sometimes, I need three hands to do this, and always worry about spilling oil or overfilling.

    I'm thinking of devising a measured container below the neck of the fuel tank. That way, I can just pour the oil into the tank without pre-measuring. Then the gas pouring into that measured oil container will ensure a very good oil/fuel mix. I always worry about a poor mix. On my first attempt to fill my tank. I forgot to shut the petcock and poured the oil in first. The oil flowed directly into the large FRAM automobile-type fuel filter. When I started the engine, it fouled and died within seconds. To resolve the issue, I had to plug the gas cap and turn the bike upside-down. This allowed the oil to flow back into the petcock and tank. After closing the valve, I flipped the bike over and stirred the fuel mixture with a pair of chopsticks. Minutes later, the bike's engine cleared up and I rode home. Since the oil/fuel mix was probably way off, I drained the gas and mixed another tankful.

    So, to keep this from happening again, I'd like to have a 1.875 ounce cup below the tank's neck. I've noticed that it's too messy to fill four quarts into the fuel tank, so I'll pump in three quarts instead. That 1.875 ounce receptacle is perfect for 50:1 oil/fuel mix. When running an engine using a 25:1 mixture, I simply fill the oil cup twice. If situated directly under the gas cap, oil/fuel mix will be excellent. Besides, the cup will also keep gas from sloshing out the gas cap's vent(I've also been having slosh problems).:detective:

    Anyone ever thought of installing a measured oil cap in their fuel tank?


  2. 5-7HEAVEN

    5-7HEAVEN Guest

    Two reasons why I want an oil dispenser in the tank:

    First, I need three hands and a leg to brace my bike, pump the nozzle and pour the oil intermittently into the tank.

    Second, syringes are messy, especially after use. I reuse the 2.56 oz. oil container, but I need to dig it outa my backpack. I always worry about spilling/overflowing gas and tipping the bike over, while monitoring the gas pump and small HT tank. I also worry about the plastic oil container breaking inside the backpack, contaminating everything.

    What I envision is a small built-in container, or one mounted externally with a screw-on cap and a petcock. It could be filled a few days before. When fillup time arrives, simply lift gas cap, insert pump nozzle, turn on petcock. When finished, shut petcock, replace cap. Refill oil dispenser anytime before the next fillup.

  3. wildemere

    wildemere Member

    Get a side stand?

    I find its a big drama trying to do the oil mixing at the station.

    Unless you are on a long road trip when there is no other option.

    I use a rear rack and a 5 gallon container to bring the fuel home so I can mix the oil properly.

    Premix should be well shaken or stirred.

    Pouring the fuel and oil together without shaking or stirring will result in a poor mix.
  4. 5-7HEAVEN

    5-7HEAVEN Guest

    Yes, I hear you about the bad premix. Shaken well or stirred makes good mixture.

    A small cup placed inside a funnel might work well enough to mix.

    A small container placed inside the fuel tank might also work well enough to mix too.
  5. Al.Fisherman

    Al.Fisherman Active Member

    I take a medicine bottle, with a screw on lid. I mark the bottle in 2oz increments and carry it with me as needed. If I had to use two hands then I'd open the bottle and sit it on the pump. Fill the tank while pouring the needed amount of oil.
  6. 5-7HEAVEN

    5-7HEAVEN Guest

    Yes, I do that at the pump too.
    I'm trying to get away from handling the oil in one hand and the nozzle in the other. What I'm envisioning is a small metal vial riveted onto the top of the HT tank. This vial has a petcock and holds up to 3 oz. While filling gas, the valve is opened and drips oil into the gas as it's pumped into the tank.

    Or maybe a small funnel with a vial or pocket filled with oil. At the pump, the funnel is placed in the tank. The incoming gas mixes with the oil in the funnel and flows down into the tank. The funnel gets placed onto the bike's rear rack on the day the MB gets filled with gas.
  7. my method is i carry a plastic drink bottle with me that i have marked "fuel line" and "oil line" which i have messured and marked very accurately. i fill it with gas to the fuel line, and then oil to the oil line. i shake it up good and then dump it in.... (i buy the small bottles of oil. i think they are something like 2-3 oz) so all you have to have is a little bottle of oil, and an empty pre marked clear plactic bottle... seems to work ok for me.
  8. you have a good idea. but to me it just seems more work than is needed. and it seems it would be hard to get an accurate mix. how would you messure the ammount of oil you were mixing in?
  9. 5-7HEAVEN

    5-7HEAVEN Guest

    The oil dispenser would be filled by a syringe measured to mix with quarts. Three syringes full is enough for three quarts and no overspill.

    Seems like a lot of work to devise such a dispenser. It's mostly internet research. There is more than likely such a container being used for another purpose. All I have to do is find it.

    A small hole will be made atop the tank. The dispenser is controlled by a petcock, which regulates the oil dripping into the fuel gushing into the tank. :idea:

    Hey, my bike's working like a charm. I'm simply personalizing it and making it easier for me to operate.:devilish:
  10. 5-7HEAVEN

    5-7HEAVEN Guest

  11. rustycase

    rustycase New Member

    57, u know well as I do that pre-mix must be made up before pouring into the tank.
  12. 5-7HEAVEN

    5-7HEAVEN Guest

    rc, yes I know that premix is the most effective way of having the best mixture.

    I realize that my method is not as effective. However, as mentioned before, a large Japanese scooter manufacturer supplied a small cup under the gas cap. This was for the rider to mix the oil/fuel at fillup time. Granted, this was back in the 60's, and I'm sure that same manufacturer now has a better way of mixing the o/f.

    It might sound dumb, but I'm willing to take a chance with the questionable way of mixing gas. I live in an apartment walkup. Mixing and keeping gas at home is very messy. Wife doesn't want gas kept around the house.
  13. 5-7HEAVEN

    5-7HEAVEN Active Member

    Well, for the past six and a half months, I've been carrying 2oz oil in my 18oz aluminum fuel bottle in the bike's cage. Now that I switched to Opti-2 oil, I only carry 1oz oil. It's worked VERY well for me. Instead of the three-handed juggling act at the gas pump, I add oil into the tank at home or on the road. THENNN, I pedal the bike to the gas station and fill 3 quarts of gas. While pedalling, the fuel/oil mix changes to about 8:1 ratio, then 100:1 when 3 quarts are pumped in.

    Sparkplug color is chocolate-brown, and the engine is not protesting in any way.

    It's rainy, windy and I feel weak from yesterday's donation @ the blood bank. With too much time on my hands, I'm back to thinking about a passive way to add oil into my gas tank.

    This might be my oil dispenser:


    #1169K15 has 1/4" NPT, holds 1.375 oz oil, 1.75" diameter and stands 2.9375" tall. It costs $18.28 plus shipping.

    I'm cheap, so I'll use this for my prototype:


    I should have one laying around somewhere. With the filter removed, this filter MIGHT hold an ounce of oil.

    Several drawbacks arise from mounting something atop the fuel tank. Unless it's the size of a matchbox, anything mounted on top looks like a huge wart on someone's nose. Add the brass fitting and a petcock, and the contraption looks absolutely ridiculous!


    Gravity is my friend, and I only need it for a few seconds. All the time after that, and everything sticks up like a skyscraper/building. What I need is a simple pivoting arm.....

    like they use on reading lamps!!!

    The lamp base gets mounted on either side and slightly below or under the HT fuel tank.

    The 1 oz oil and receptacle is lighter than a light bulb, socket and lampshade. Attach the oiler to a length of hose. The hose extends thru a hole in the top of the tank. When the lampshade arm is extended upward so that the oiler is above the tank, 1 oz of Opti-2 flows in.

    I don't even need a control valve or petcock. Gravity is my friend. There is no siphon action to contaminate the Opti-2, as long as the hose does not extend below the tank's fuel level. Even if fuel siphoned into the oiler, it really wouldn't matter at all.

    There's a vast amount of lampshade choices on the market. I MIGHT have a spare one laying around.

    Man, this is gonna be CHEAP! Spare fuel filter and brass fittings, spare lampshade, spare fuel line laying around.....

    I'll need a tiny funnel to fill 1oz oil into the filter.

    The best part is that I get to SEE the exact amount of oil and watch it flow into the tank!

    What fun it is to recycle stuff and make it work on my bike!
    Last edited: Nov 27, 2011
  14. 5-7HEAVEN

    5-7HEAVEN Active Member

    I WAS gonna use the telescopic pole for my inspection magnet. I MIGHT use it for the prototype, then swap to flex tubing if this oil-dispensing project proves to be feasible.

    This 12" length of tubing would work well:


    A 12" length of fuel hose connected to a 90-degree fitting @ the tank might be just the ticket.:idea:
  15. GearNut

    GearNut Active Member

    Use the tubing as the storage container?
    I bet that would work very well indeed.
  16. Barnfresh

    Barnfresh Member

    Good thinking GN keep it simple, use the tubing as the storage container. Something to think about when transferring, storing then mixing 1 ounce of oil is how accurate do you think your final gas/oil ratio is going be? Unless you're rinsing each container with the gas from your fuel tank between each transfer, what percent of your original 1 oz do you figure is left on the walls of your transfer/measuring, funnel and metering containers?
    Last edited: Nov 27, 2011
  17. 5-7HEAVEN

    5-7HEAVEN Active Member

    Funny that you should mention that.:grin5:

    I filled up earlier this week. I ALWAYS look into the empty 18oz reserve bottle and see a bit of oil at the bottom. On Saturday, I had time, so I decided to measure this excess oil. I inverted the bottle above an empty cup, and let it drip out for over an hour. Then I filled a syringe to where it measured 40:1 per quart. When I poured the excess from the reserve bottle, the oil measured 36:1/quart. That's an extra 2.78cc; divided by 3 quarts, that's .926cc less oil for the mix.

    Instead of 100:1 fuel/oil ratio, it's @ 103.34:1. I could leave the 18oz bottle's neck in the tank for an hour. That'd lower the ratio to 100.XXX:1.

    I COULD pump some gas into the reserve bottle, lowering the oil's viscosity and further lower the fuel/oil ratio to 100.00X:1. I could also put a leetle more oil into the container to guarantee 100:1 ratio or less.

    I KNOW I'm not gonna pump gas into the container. I MIGHT leave the container in the upright position for an hour or so. I MIGHT put a little more oil in the mix. ORRRRRR, I might do nothing about it. JMO, a 3% decrease in oil mix is inconsequential.
    Last edited: Nov 28, 2011
  18. 5-7HEAVEN

    5-7HEAVEN Active Member

    EXCELLENT idea! Then all I'd need is a 90-degree fitting and a length of hose w/control valves on both ends. And a tiny funnel.

    So I carefully pour 1 oz of oil into a length of tubing. Then I add a few inches to that length, so the oil level is below the fitting. After shutting both valves, the tubing is either coiled up or laid out along the bike's frame.

    By simple math, I should be able to figure out the volume in any tubing's length and inside diameter. Then I'll know what size hose to use. If the flexible tubing can be fitted with control valves on both ends, I might use that "desklamp shade tubing".

    Update: Okay, 16" of 3/8" ID hose would hold more than 1 oz of oil. With 7/16" ID hose, 12" would be needed. Or 9" of 1/2" hose would hold the oil. That's enough hose to simply tuck under the HT fuel tank.
    Last edited: Nov 28, 2011
  19. 5-7HEAVEN

    5-7HEAVEN Active Member

    Ok, the parts are on the way.

    Simple math says that 1 oz of fluid will fill 4" of a 3/4" hose. The hose used will be clear for visibility. A 1/2" hole will be drilled atop the 4-liter tank and a 90-degree 1/2" fitting installed. 1/2" X 3/4" barb fittings press onto a 6" clear fuel line. A 1/2" brass valve on each end of the hose keeps the oil in the line. A 1/2" allen plug with a tiny hole drilled thru it screws into the end valve. Oil is poured in when the plug is removed and the end valve is opened. Then the end valve is closed and the plug reinstalled. When it's time for the oil in the line to enter the fuel tank, both valves are opened. The 1 oz of oil will quickly flow out of the clear fuel line and into the fuel tank. Oil will transfer within seconds, then both valves will be closed.

    It SHOULD work, as long as both valves are above the 90-degree fitting.
  20. 5-7HEAVEN

    5-7HEAVEN Active Member

    I just got an epiphany!

    The fitting enters the tank towards the its bottom. When both valves are opened, then gas will fill the clear line up to the tank's level (The line is vented by the hole in the top valve's brass plug).

    In other words, this clear fuel line will also be a fuel gauge!:idea:
    Last edited: Nov 30, 2011