Lean Symptoms 

The engine of Lean symptoms include: 

1.Bogging or gagging when opening the throttle quickly. 

2.Unstable idle or idle often hangs.

3.Having a very harsh transition from a weak mid range to strong top end.

4.The engine will reach a higher temperature in a short time.

5.Bike feels flat, down on power, or excessively "pingy" when the throttle is opened more than 3/4. (Power jet lean)

6.The spark plug is lighter in color.

GEN3 adjustment method:

First, Adjust the fuel assist circuit screw counterclockwise.  If you are still unable to get stable idle or can't change throttle response or can't change the lean state of the throttle opening at 1/2. Then you need to adjust the metering rod. Please use our approved metering rod adjustment tool for you to adjust, Rotate the metering rod clockwise in 1/4 turn each time, Note that 1/4 turn is an adjustment unit (.006” per ¼ turn), The "sweet spot" is usually between two quarter turns.  We never recommend that users go more than a half turn in each adjustment. Note that the four-stroke version usually does not require adjustment of the metering rod, only the fuel assist circuit screw and idle screw. Remember that the flat side of the metering rod must always be facing the motor after each adjustment.

GEN3-pro adjustment method:

First, Adjust the fuel assist circuit screw counterclockwise. If you are still unable to get stable idle or can't change throttle response or can't change the lean state of the throttle opening at 1/2.  Then you need to adjust the metering rod. Turn off the engine and fully open the throttle.  At the same time press the "clicker" to rotate clockwise (.00197” per “click”), The "sweet spot" is usually between 2-3 “clicks”.  We never recommend that users go more than 3 “clicks” in each adjustment. Note that the four-stroke version usually does not require adjustment of the metering rod, only the fuel assist circuit screw and idle screw. Remember that the metering rod tool is not used for adjustment of the GEN3-pro unless you need to remove the metering rod or replace it with another type of metering rod.  

Power Jet Adjustment Method:

Power Jet only works when the throttle is opened more than 1/2, It is never used to adjust at idle or throttle opening less than 1/2, The Power Jet works like a faucet. Turn clockwise to reduce fuel until fully closed. Conversely, turning counterclockwise increases fuel.  Bike feels flat, down on power, or excessively "pingy" when the throttle is opened more than 3/4.You need to turn the Power Jet counter-clockwise, no more than 1/8 of a turn per adjustment. A standard dirt bike should not need a power jet that is open more than 1 1/4 turns. If you are riding a snow bike or dunes where you are wide open for extended periods of time with excessive load, you may need to go to 1 3/4 turn open, but not more than 2. Dirt bikes running gasoline will never need a larger power jet. 

*Please note that never turn off the Power Jet of GEN3 completely.

*The Power Jet of GEN3-pro is usually turned off, and the user can open it or adjust it according to the rider's need.  Its role is mainly for engine cooling.

Rich Symptoms 

The engine of rich symptoms include: 

1.Stutter or feel blubbery before taking off. 

2.Smoke billows with "pipe/silencer bang".

3.The power output of the engine is very weak.

4.Idle rpm recovery very slowly or becomes wavy when closing the throttle quickly.

5.Bike feels flat, down on power, or dull sound when the throttle is opened more than 3/4,and lots of spooge on the muffler outlet (Power jet rich).

6.The spark plug is wet and the color is black or brown-black.

GEN3 adjustment method:

First, Adjust the fuel assist circuit screw clockwise. If you are still unable to get stable idle or can't change throttle response or can't change the rich state of the throttle opening at 1/2, then you need to adjust the metering rod. Please only use our approved metering rod adjustment tool. Rotate the metering rod counterclockwise in 1/4 turn each time.  Note that 1/4 turn is an adjustment unit (.006” per ¼ turn). The "sweet spot" is usually between two quarter turns.  We never recommend that users go more than a half turn in each adjustment. Note that the four-stroke version usually does not require adjustment of the metering rod, only the fuel assist circuit screw and idle screw. Remember that the flat side of the metering rod must always be facing the motor after each adjustment.  

GEN3-pro adjustment method:

First, Adjust the fuel assist circuit screw clockwise. If you are still unable to get stable idle or can't change throttle response or can't change the rich state of the throttle opening at 1/2. Then you need to adjust the metering rod. Turn off the engine and fully open the throttle.  At the same time press the "clicker" to rotate counterclockwise (.00197” per “click”).  The "sweet spot" is usually between 2-3 “clicks”.  We never recommend that users go more than 3 “clicks” in each adjustment. Note that the four-stroke version usually does not require adjustment of the metering rod, only the fuel assist circuit screw and idle screw. Remember that the metering rod tool is not used for adjustment of the GEN3-pro unless you need to remove the metering rod or replace it with another type of metering rod.  

Power Jet Adjustment Method:

Power Jet only works when the throttle is opened more than 1/2.  It is never used to adjust at idle or throttle opening less than 1/2. The Power Jet works like a faucet. Turn clockwise to reduce fuel until fully closed. Conversely, turning counterclockwise increases fuel.  Bike feels flat, down on power, or dull sound when the throttle is opened more than 3/4,and lots of spooge on the muffler outlet.  You need to turn the Power Jet clockwise, no more than 1/8 of a turn per adjustment.  A standard dirt bike should not need a power jet that is open more than 1 1/4 turns. If you are riding a snow bike or dunes where you are wide open for extended periods of time with excessive load, you may need to go to 1 3/4 turn open, but not more than 2. Dirt bikes running gasoline will never need a larger power jet. 

*Please note that never to turn off the Power Jet of GEN3 completely.

*The Power Jet of GEN3-pro is usually turned off, and the user can open it or adjust it according to the environment, Its role is mainly for engine cooling.

"Sweet Spot" Status:

1. Crisp and quick throttle response.

2. Not a lot of smoke and strong low-rpm torque and strong mid-range and top-end power.

3. Almost no spooge.

4. Better fuel economy than stock carb.

5. The color of the spark plug is brown or dark brown.

How to switch between Single-circuit/Multi-circuits?

All GEN3/GEN3-pro are factory set to Multi-circuits mode: fuel assist circuit on and air assist circuit off. Due to the differences of each engine and the limitations of a Single-circuit, we usually recommend users to use a Multi-circuits mode. The Multi-circuits mode has better engine compatibility.  Users can easily get stable idle state and strong bottom-end torque and Unmatched Throttle Response. Of course, if your engine is healthy enough, You can also get the same performance with Single-circuit mode.Note that the GNE3/GEN3-pro four-stroke version must be a Multi-circuits operating mode.

Single-circuit:  (2T only)

1.Turn off the fuel assist circuit, Turn the fuel assist screw clockwise to the end (Do not use tools, only fingers are allowed).

2.Turn off the air assist circuit, Replace the long screw on the right side of the carburetor (Factory installed with long screw).

3.Turn off the Power Jet, Turn the Power Jet screw clockwise to the end (We never recommend turning off the Power Jet completely if it is GEN3 version).

Multi-circuits: (2T and 4T)

Mode 1: Turn On the air assist circuit. Insert short screw on right side of the carb Then the fuel assist circuit adjusted to between 2-4 turns.  This allows for maximum low end performance.4t and 2t (Do not use tools, only fingers are allowed).

Mode 2:Turn Off  the air assist circuit.  Insert the long screw into the right side of the carb.  Then  the fuel assist circuit adjusted to between 0.5-1.5 turns. This allows for smooth idle and low end transition.

Mode 3: Turn on the Power Jet, Turn the Power Jet screw counterclockwise.  In combination with any of the above modes to maximize top end (1/2 or greater throttle) performance (Usually the Power Jet of GEN3-pro is turned off).

1:How do I adjust the metering rod?

GEN3:Turn clockwise to get richer (shorter). Turn counterclockwise to get leaner (longer., Each adjustment is a quarter turn. The metering rod will become longer or shorter as it turns (.006” per ¼ turn), Until strong low-rpm torque and strong mid-range power. The "sweet spot" is usually between two quarter turns.  We never recommend that users go more than a half turn in each adjustment. Remember that the flat side of the metering rod must always be facing the motor after each adjustment.

GEN3-pro:Turn off the engine and fully open the throttle, At the same time press the "clicker" to rotate (.00197” per “click”). Until strong low-rpm torque and strong mid-range power. The "sweet spot" is usually between 2-3 “clicks”.  We never recommend that users go more than 3 “clicks” in each adjustment. Remember that the metering rod tool is not used for adjustment of the GEN3-pro unless you need to remove the metering rod or replace it with another type of metering rod.

*Note that the four-stroke version usually does not require adjustment of the metering rod, only the fuel assist circuit screw and idle screw.

2:How do I adjust the Power Jet?

Turn clockwise to get leaner. Turn counterclockwise to get richer. Each adjustment is 1/8 turn, Until gets strong top-end power.

3:How do I adjust the fuel assist circuit screw?

Turn clockwise to get leaner. Turn counterclockwise to get richer. At the same time, it needs to cooperate with the adjustment of the idle screw. Idle rpm is 1,500 – 2,200 RPM(2T).  And idle rpm is 2,200 – 2,400 RPM(4T).  Until excellent throttle response.  NOTE: The richer fuel assist circuit provides quick throttle response and strong low-rpm torque.

4: Why is my bike bogging?

If you quickly open the throttle when the engine is idling.  And, the engine stops running, or the motor gags like it wants to die.  Your rod is most likely too lean.  If it gurgles or stutters, it is too rich.

5: Why is my top end flat?

If you are running wide open and your bike feels flat, turn out (richen) your power jet in 1/8th turn increments until it runs how you want it to. If it stutters or gurgles, turn in (lean) your power jet 1/8th turn increments.  If the problem persists, you may need to check the air filter system, too much air filter oil or dust can interfere with the air flow.

6: Why is my bike hard to start?

Normally, this is because the fuel assist circuit screw and idle screw are not adjusted for the best operation. You don’t need to adjust the metering rod. During a cold start, you don’t need to use the choke first. You can try to rotate the fuel assist circuit screw counterclockwise one turn and then start and wait for the engine to get hot.  Then restore the fuel assist circuit screw back.  If the weather is very,very cold, Use the choke.

7: If I see smoke and spooge, Do I need to adjust the metering rod?

No, there are many types of 2T engine oil. These phenomena may have something to do with them, but this is not important. The important thing is that if the engine works well, then ignore it.

8: Should I change my oil mixture?

We recommend you to use fully synthetic 2T engine oil. Mix your oil according to the oil manufacturer’s specs.

9: Why does my bike sound rich, but run great?

In actual riding, sound does not represent performance. What is important is performance, not whether the sound is good or not.

10: Why does my bike run with the choke on, but not with it off?

Your bike is way too lean. This could be caused by an air leak at the carburetor connection. If you have selected multi-circuit mode, it may be caused by a damaged tip of the fuel assist circuit screw.  If the problem persists, you may also need to check the engine's reed valve system and electrical system.

11: I'm going to a high compression head, what do I need to change?

Try riding it with your current settings first. Minor rod tuning may be required based on how aggressive the head is. It may also be necessary to increase the octane rating of the fuel.

12: Why I forgot to turn off the fuel tank switch, my engine is full of fuel?

A fuel filter must be installed between the fuel tank and the carburetor and replaced once a year. Please turn off the fuel tank switch after riding, and during transport. If the fuel fills the entire engine. First turn off the fuel tank switch. Remove the spark plug and press and hold the stop button(This step is very important (otherwise it will cause a fire). Try to use the starter motor or kick to get rid of the fuel in the engine.  Then clean up all the spilled fuel and clean the spark plugs and reinstall the spark plug.  If necessary, clean the Needle Seat Valve of the carburetor.  When re-opening the fuel tank switch, please pay attention to observe the fuel level in the float chamber(BIKE must be upright). The best liquid level position should be in the middle of the "XTNG".  If not, please adjust the float until the best liquid level.

13.How to adjust the level of fuel ?
Image "A":Using tools to adjust the up and down position of this metal sheet can change the fuel level.
Image "B":Correct fuel level.
Image "C":Please DO NOT remove the central screw,Otherwise the slider or the metering rod will be stuck.