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Post by repherence2 on Nov 9, 2018 21:26:35 GMT -5
I have always ran a the oil injector pump for all of my minarelli engines (70cc and 90cc) for the ease and simplicity of it.
What comes with the territory of injection pump is the James Bond Smokescreen when you fire up the bike after it sat for along time. Upon removal of my 90cc bore, iI found about 1 tablespoon of oil in the crankcase. The engine sat for several months. Now I fully understand how the James Bond Smokescreen originates.
The blessing in disguise is the fact the internals of the crankcase was cherry, pristine, no corrosion at all, even though it sat for half a year.
...but in the end, I think I will crossover to premix.
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Post by ryan_ott on Nov 9, 2018 22:43:30 GMT -5
Even when you premix upon disassembly I’ve always had some oil in the bottom of the cases. With premix you don’t have as much of a smoke screen at startup.
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Post by repherence2 on Nov 10, 2018 11:54:31 GMT -5
Even when you premix upon disassembly I’ve always had some oil in the bottom of the cases. With premix you don’t have as much of a smoke screen at startup. That's good to know. I just felt that the amount of oil I seen in my crankcase was excessive. I never realized how much oil drains into the engine even when the engine hasn't run for several months. It probably would have taken 10 minutes in front of the house to clear it out all the James Bond action smoke. Ryanott, I assume premix doesn't have much smoke screen effect on startup after sitting for a while? |
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Post by jackrides on Nov 10, 2018 12:09:02 GMT -5
A decent oil injection setup should have a spring loaded check valve between the pump and injection point(s). That way it only flows under pressure. It would sometimes be in the fitting from the line to the injector. If your scoot has one, it is not closing completely.
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Post by ryan_ott on Nov 10, 2018 19:12:36 GMT -5
This engine has been open for a month or more. Still plenty of oil residue. If no oil then you may be mixing too lean. When premixing there is still more smoke at startup then running. Once it’s up to temperature the smoke is minimal. But it no where near a stocker with a leaky injection pump.  |
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Post by SMALL CC TEK on Nov 10, 2018 19:39:48 GMT -5
Remember it's twostroke inefficient fuel drinking high revving and powerful. Once you warm your motor up depending on your oil choice and ratio, you should see very little if any smoke with today's world of oils !Your pipe gets coated with oil inside it takes a minute for it to burn off and stop emitting smoke . And if you had a carb that injected oil from a small brass check valve on the side of it , they go bad and are not good at keeping close after a long run the siphon effect is strong even after the motor is off .. Check the Vent on your oil cap or enlarge it .
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Post by repherence2 on Nov 11, 2018 13:02:55 GMT -5
A decent oil injection setup should have a spring loaded check valve between the pump and injection point(s). That way it only flows under pressure. It would sometimes be in the fitting from the line to the injector. If your scoot has one, it is not closing completely. Im pretty sure the used chinarelli scoot didn't have an oil line check valve. I've done so many smoke screen start ups throughout the years. |
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