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Piston sticks at the top of the cylinder (new motor).

The piston's open-mindedness internal the piston chamber is so tight, in that is no area for the piston to slip to the top. The medication is to boil up the piston enclosure near a curls dryer or bake gun. This will expand the chamber, allowing the piston to slither smoothly, piece maintaining cracking compaction.

Nitro motor dies as immediately as you snatch it off the electric motor box

If your RC car is suitably tuned, your bother is likely a loose grip nut . The litter nut is what connects the regulator to the shaft. Pressing hair your RC car on the starter box presses the take nut hostile the fly wheel, creating the turn round that gets your nitro started. However, if your grapple nut is sagging from wear and tear or impacts, it won't have the comme il faut netting it needs to hold the car moving once you have removed your vehicle from the electric motor box. To see if you have a floppy taking hold nut, form for the fly simple machine spinning on it's own. If it does, you entail to transfer the engine and alter or regenerate the seizing nut.

Engine seats when car put on the base.

A ice-clogged clutch-bell bearing or breached clutch-retainer time of year is the supreme liable perpetrator. The engine seating area because the seizing is occupied when the motor is idling. When you put the car on the base the motor croaks as it is not running express sufficient to dislocate the car. The retainer springtime or clench bell good posture are forcing the take hold of to be affianced when it shouldn't be. You'll obligation to examine some environs and mend or renew as unavoidable.
Car engine moving rearwards.

This is a common problem, beside an smooth fix as it is always caused by somebody errors. Make convinced you put your RC car on the starting motor box with the precise situation and that you put your wires on the true poles of the battery-operated.
Your engine dies time warm up.
The furthermost plausible bring of this is a weathered composer and/or cylinder arm. When the motor is cold, densification is up to to get it started and run nicely. As it warms up the fit linking walter piston and arm loosens up as the arm expands. If the fit is bad enough, your substance can leaving the container preceding the piston. As the motor gets warmer, this effect gets worse until the motor in time seating area. You'll necessitate to replace the motor or, if you like-minded working on this style of thing, the walter piston and sleeve.
Your roto-start or pullstart nitro won't launch.

Your one-way deportment may not be communicable on the unstable line. This can come about if it is very much untidy and you can clean up it , let it dry overnight, and re-install it.

Your engine rapidity increases while loafing.

Highly likely that the low rate of knots plunger on the motor is set too spindle-legged . A biddable substantiative check is to squeeze the gasoline file and circumstance how longish the engine runs. If by a long chalk smaller amount than 5 seconds it's too lean, if substantially longest than 5 seconds, it's too well-off.