Thanks mr. Benimur, one thing, I already pre mix the 2t & the gasoline, what I observe is that in the event that the engine is already cooled down overnight, it is very hard to restart the engine...i already cleaned the carburator very well, but still same problem everyday... and I can't low down the rpm idle of the engine...
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Re: *** follow up problem
Hard starting could be caused by:
vacuum leak (specially since you can not adjust idle lower). Was the original 2T oil injector to the carb plugged?
2T oil pooling at the bottom/bowl of the carb (specially since you are using pre-mix);
the sparkplugs fouls fast/easily. You can try changing the plugs in the morning before you start.
Imagine the scenario of the original arrangement of the carb & 2T oil (not pre-mix); on initial start/early morning, gasoline would be drawn in first without much 2T. This ensures that the engine fires. When it is already running, that would be the only time the oil pump will work and therefore inject the 2T to the carb to mix with the fuel drawn inside the combustion chamber. With pre-mix, the first gasoline used (inside the carb's bowl) has already oil mixed.
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it means 25 parts of gasoline to 1 part of two-stroke oil (the gasoline is always being the higher number).
to 1 litre (1000 mililiters) it means adding 0,04 litres (40 mililiters of oil).
easiest ways to do it:
- get a 40 mililiter plastic shotglass (they are about 10 dollars/7 pounds for one hundred on amazon) and always fill full litres, then add one shot of oil for every litre filled;
- get a five-litre jerrycan and pre-mix five litres of gasoline with two decilitres (200 mils) of oil.
Are you sure this is a DT 125 as with this particular bike it is self mixing there should be a separate tank by the handle bars just under the front plastics opposite the water tank this is where you fill it with oil then just put gas in the gas tank and it will mix it self you do not have to do anything else do not put oil in the gas tank with the gas mixing would usally be dirt bikes or really old bikes only
If you don't put pre-mixed fuel in your tank then the tank in the back is probably a fuel mix oil tank. You'd use an injector oil to fill that so it has something to mix into your fuel. Engine crankcase oil is a different thickness and wouldn't work for that application.
It depends if you still have a pre mix tank already fitted. Mine came with the pre mix tank taken off. It is a white coloured container in a fairly flat shape on the 98 model which should be underneath the seat when you lift it. Not sure about newer models. It should have 2 stroke oil in (quite often pink). If not I have been advised to mix the 2 stroke with the petrol at about 50:1 ratio, however I would check with your local motorcycle shop or Aprilia dealer. Alternatively get a workshop manual for the correct year of bike and it will give you all the information you need in there. Also if the tank runs to empty it has to be bled otherwise if air is in the pre mix tank it can cause damage to the engine.
is this a 2 stroke scooter? if it is, try to premix your gasoline. and try to test it. if it works, then your autolube has a problem. if it is a 4 stroke. try to check your coil. and try borrowing another coil and test it.
Offhand, the only factor to be checked that could foul a sparkplug for your bike would be the 2T oil injector/pump. There is too much 2T oil going to the combustion chamber. Either the injector would require restricting or for some reason, there is also 2T oil in the fuel tank (pre-mix).
Good luck and Thank you for using FixYa. Happy Holidays.
On most vehicles, a red warning light indicates need for immediate attention. One area that this light would indicate would be oil level and/or oil pressure. On most bikes, the red light would show when IGN is first switched on telling the rider that the oil is not pumping. Once the engine has started this should go out indicating that the oil is circulating. In other bikes, the red indicator could represent the level of a 2T oil. In such instances, if it comes on with just switching on the IGN, then this indicates that there is little or no 2T oil in the reservoir. So this would be really be dependent on the make & model, whether a 4 stroke or a 2 stroke. Note: running a 2 stroke engine with little or no 2T oil in the fuel mix would result to burned pistons, rings and an overheated engine.
Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.
Am glad that your bike runs now albeit the 7K flatspot. I have to agree that if you have a pre-mix in the tank and the 2T oil pump is already working, the fuel mixture tends to be harder to burn and would produce a smoky exhaust. Even having said this, I beg to disagree that this would be the cause of the hesitation/flatspot on about 7K RPM. I suspect that you have an air leak somewhere, most probably before the carbs. This would be the airbox assembly, the collar/mating/coupling to the entrance of the carb or even the air filter itself (or more so in the absence of an air filter). You may want to check that no air can enter the carbs other than those that passes through the filter.
On a side note, this would be the third post that you have made on the same bike and I have answered them resulting in what is now a rideable bike. Perhaps unknown to you and due to my current standing at the site, even a "Helpful" rating would be detrimental and would be bringing my stats down. Normally, this should discourage any further attempt to provide assistance, however, as earlier premised, "perhaps unknown to you"...