|On most nitro vehicles, you have to reset the gear mesh whenever you reinstall the engine. If you thoroughly clean your vehicle after every day of running, you’ll have to set the gear mesh quite often. If you know your gear mesh is perfect, before you remove your engine, scratch lines on the bottom of the chassis plate to show exactly where the engine-mount screw heads are. Next, fill these scratch marks with a bright paint, and wipe off the excess. Now, you’ll be able to quickly reinstall your engine with confidence, knowing that your gear mesh will be perfect.