Prime the engine until fuel reach the carb.

Install the glow plug starter and start the engine.

Once the engine is started make sure that it is running on the rich side. Let the engine idle for few seconds, if the engine seems to die, give a little blip on the throttle.

Run your vehicle at low speed, don't exceed 1/4 throttle. Go straight and do wide turns. Don't try to break speed record.

Frequently verify the engine temp.

After 2-3 minutes, engine temperature should be between 195F and 205F. If the temp is below, turn clockwise the high speed needle 1/16 turn. If the temp is above, turn counter clockwise the high speed needle 1/16 turn.

Run your vehicle until the fuel tank is almost empty. Stop the engine before the fuel tank is empty to prevent your engine from running lean.

Be sure the piston is at BDC (Bottom Dead Center). This means that the piston is at the bottom of the cylinder.

Let your engine cool for 10-15 minutes.

Install the glow plug starter and start the engine.

Once the engine is started, let the engine idle for few seconds, if the engine seems to die, give a little blip on the throttle.

Run your vehicle at low speed, don't exceed 1/2 throttle. Go straight and do wide turns. Don't try to break speed record.

Frequently verify the engine temp.

After 2-3 minutes, engine temperature should be between 195F and 205F. If the temp is below, turn clockwise the high speed needle 1/16 turn. If the temp is above, turn counter clockwise the high speed needle 1/16 turn.

Run your vehicle until the fuel tank is almost empty. Stop the engine before the fuel tank is empty to prevent your engine from running lean.

Be sure the piston is at BDC (Bottom Dead Center). This means that the piston is at the bottom of the cylinder.

Let your engine cool for 10-15 minutes.

Turn the high speed needle 1/16 turn clockwise to lean the engine.

Install the glow plug starter and start the engine.

Once the engine is started, let the engine idle for few seconds, if the engine seems to die, give a little blip on the throttle.

Run your vehicle but don't exceed 3/4 throttle. Go straight and do wide turns. Don't try to break speed record.

Frequently verify the engine temp.

After 2-3 minutes, engine temperature should be between 205F and 220F. If the temp is below, turn clockwise the high speed needle 1/16 turn. If the temp is above, turn counter clockwise the high speed needle 1/16 turn.

Run your vehicle until the fuel tank is almost empty. Stop the engine before the fuel tank is empty to prevent your engine from running lean.

Be sure the piston is at BDC (Bottom Dead Center). This means that the piston is at the bottom of the cylinder.

Let your engine cool for 10-15 minutes.

Turn the high speed needle 1/8 turn clockwise to lean the engine.

Install the glow plug starter and start the engine.

Once the engine is started, let the engine idle for few seconds, if the engine seems to die, give a little blip on the throttle.

Run your vehicle, don't exceed 3/4 throttle. Go straight and do wide turns. Don't try to break speed record.

Frequently verify the engine temp.

After 2-3 minutes, engine temperature should be between 205F and 220F. If the temp is below, turn clockwise the high speed needle 1/16 turn. If the temp is above, turn counter clockwise the high speed needle 1/16 turn.

Run your vehicle until the fuel tank is almost empty. Stop the engine before the fuel tank is empty to prevent your engine from running lean.

Be sure the piston is at BDC (Bottom Dead Center). This means that the piston is at the bottom of the cylinder.

Let your engine cool for 10-15 minutes.

Turn the high speed needle 1/8 turn clockwise to lean the engine.

Install the glow plug starter and start the engine.

Once the engine is started, let the engine idle for few seconds, if the engine seems to die, give a little blip on the throttle.

Run your vehicle, you can go full throttle for very short time, only few seconds (2-3). Go straight and do wide turns. Don't try to break speed record.

Frequently verify the engine temp.

After 2-3 minutes, engine temperature should be between 210F and 225F. If the temp is below, turn clockwise the high speed needle 1/16 turn. If the temp is above, turn counter clockwise the high speed needle 1/16 turn.

Run your vehicle until the fuel tank is almost empty. Stop the engine before the fuel tank is empty to prevent your engine from running lean.

Be sure the piston is at BDC (Bottom Dead Center). This means that the piston is at the bottom of the cylinder.

Let your engine cool for 10-15 minutes.

Turn the high speed needle 1/8 turn clockwise to lean the engine.

Install the glow plug starter and start the engine.

Once the engine is started, let the engine idle for few seconds, if the engine seems to die, give a little blip on the throttle.

Run your vehicle, you can go full throttle for very short time, only few seconds (2-3). Go straight and do wide turns. Don't try to break speed record.

Frequently verify the engine temp.

After 2-3 minutes, engine temperature should be between 210F and 225F. If the temp is below, turn clockwise the high speed needle 1/16 turn. If the temp is above, turn counter clockwise the high speed needle 1/16 turn.

Run your vehicle until the fuel tank is almost empty. Stop the engine before the fuel tank is empty to prevent your engine from running lean.

Be sure the piston is at BDC (Bottom Dead Center). This means that the piston is at the bottom of the cylinder.

Let your engine cool for 10-15 minutes.

With six tanks burnt, your engine is almost broken-in. Now follow the next steps to complete and set your engine for optimal performance.

It's now time to set the high speed needle.

Install the glow plug starter and start the engine.

Once the engine is started, let the engine idle for few seconds, if the engine seems to die, give a little blip on the throttle.

Run at mid speed to let the engine warm up. The temp should be between 210F and 230F.

Frequently verify the engine temp.

Do some high speed passes. A light blue smoke should come out the tuned pipe while full throttle. If there is no smoke, richen the high speed needle. If the engine can't rev high enough and there is a lot of smoke coming out of the tuned pipe, lean the high speed needle. Always check the engine temp after high speed passes. If the engine is too hot, richen the high speed needle. If the engine is too cold, lean the high speed needle. Optimal temperature vary depending of your engine brand. Normally, optimal operating temperature should be between 230F and 250F. I never exceed 250F. Keep in mind that depending of the outside temperature and atmospheric pressure, your engine's temp and performance will vary.

Install the glow plug starter and start the engine.

Once the engine is started, let the engine idle for few seconds, if the engine seems to die, give a little blip on the throttle.

Run at mid speed to let the engine warm up. Always tune an engine when hot.

Frequently verify the engine temp.

Let your engine idles for 30 seconds and then peg the throttle. If your engine hesitates to rev up, lean the low speed needle. If your engine quickly accelerates with no smoke coming out of the tuned pipe, richen the low speed needle. Always richen or lean the low speed needle 1/16 turn at the time.

A good trick to adjust the low speed needle is to let the engine warm and pinch the fuel line at 1 inch from the carb. The engine should lightly rev up for 3-4 seconds and then die.