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Discussion Starter #1 (Edited)
The problem of my RC51 is as below:
1, when we repair and text it in my house, the exhaust has no problem.
2, when I test it running in the street, the problem would appear:
a, the exhaust pipe would have blasting sound(the right pipe)
b, when I turn over the button on the left side above the gear box , the RPM would raise up without flame out. What is more, I think this button just like the air throttle for motor bike which without electric injection, but usually, electric injection model do not has the air throttle. So what is it?
c, in the street, neutral shift. Turn the handle throttle to accelerate and make the RPM to 6K r/min and then stop accelerate, both pipes would flaming eruption.

As I know, for b, if the button is really the air throttle, when I turn it over, the RPM raise up without flame out, it means the the oil quantity is less than requirement.

For c, because both pipes have flaming eruption, so it means that the oil quantity is more than requirement.

So what is wrong?

Do you have any maintain user manual for SP2?
 

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If you are having a "Flaming eruption", it is the fuel pressure regulator, or the curry you are eating:)
 
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