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HP Carb Install

Go-Ped® HP Carb Installation Instructions

What tools you will need:

Phillips screwdriver

10mm wrench

Dykes or side cutters

Step 1: Empty all gas from fuel tank and pump primer bulb on stock carb to purge fuel from carb.

Step 2: Remove these stock items: fan cover, engine shroud, air filter, carburetor, and intake manifold. Disconnect throttle cable from stock carb

and unhook fuel lines. Wipe cylinder surface clean.

Step 3: Install HP intake manifold and new gasket. Make sure to line up the small hole in the bottom of the gasket with the small hole in the

cylinder. The manifold must also line up with the hole. Most manifolds have a hold on top and bottom, so there is no difference in they way it is

mounted. It is recommended to use Lock-tite on the screws that hold the manifold on.

Step 4: Remove the throttle cable bracket from the HP carb. Install the throttle cable into the bracket and secure it using the supplied 6mm nut.

Slide the spring over the end of the throttle cable, it should set against the 6mm nut. Pull the spring back and hook the end of the cable into the

swivel on the HP carb. Now re-install the bracket onto the HP carb.

Step 5: At this point it is best to make sure that the throttle operates smoothly and completely. Be sure that the carb is closing all of the way

when the throttle is released and that it also fully opens. There is an idle adjustment screw that stops the carb from closing all of the way. It is best

to back this screw out when testing the opening and closing of the throttle. The idle screw is the larger of the 3 adjustment screws on the carb, the

end of it is tapered and the throttle shaft pulley rests against it to set the idle. You may also need to bend the throttle cable bracket to obtain proper

operation. It is also best to spray WD-40 or some other type of lubricant on the throttle linkage at the carb. This will cure most sticky throttles.

You should always keep the throttle linkage lubricated in the future.

Step 6: Install the HP carb using the stock bolts and either a velocity stack or the stock air box bottom. The fuel circulation bulb on the carb

should face up. The side on the carb that is rounded where it goes into the throat of the carb should face the air filter. When installed the adjustment

screws should be on the pull start side of the Go-Ped®. Make sure that the mounting screws do not go all the way through the intake manifold

and make contact with the cylinder. This will cause the Go-Ped® to not start. This has the same affect as pressing and holding the kill switch. If

the bolts are too long, you will need to add washers onto the bolt before installing them thru the velocity stack and carb.

Step 7: Install the fuel lines with the blue line on the fitting on the bottom of the carb and the yellow line on the fitting on the top of the carb.

Install the remainder of the air filter system.

Step 8: You will now need to trim the engine shroud so it does not interfere with the operation of the throttle. You will need to try p utting the

shroud on to see where it interferes with the linkage. You can then carefully trim it a little at a time, while trying to fit it on. Also, make sure to

check for interference at all throttle positions. Install the shroud when it is sufficiently trimmed.

Step 9: You can now re-install the fan cover and pour gas into the fuel tank. Pump the fuel circulation bulb on the top of the carb until you see fuel

in the bulb and fuel going back to the gas tank thru the yellow fuel line. Double check the operation of your throttle again.

Step 10: Set the adjustment screws as follows: High speed 1 turn out, low speed 1-1/2 turn out, idle screw all the way in. To set the high and low

speed, turn them all the way in just until they stop, then back them out the suggested amount. The high speed is the one with the ‘T’ and the low

speed requires a regular screw driver. The high speed needs to be adjusted for peak speed/rpm while riding, then turn it out 1/16 of a turn. Never

adjust the high speed by free revving with the back wheel off of the ground and holding the throttle wide open while adjusting the screw. Flywheels

can explode with excessive rpm from free revving! The low speed should be adjusted for good throttle response when initially accelerating.

If the engine does idle and it is set too high, turn the idle screw out to set. Generally though, if you want your Go-Ped® to idle, you will have to

leave the idle screw turned in all of the way and then turn the low speed screw in until the desired idle speed is attained. But, when the HP carb is

adjusted to idle, the low speed adjustment may be lean causing hesitating when accelerating. When tuned for best performance, the engine might

Go-Ped® HP Carb Installation Instructions

Contents:

What tools you will need:

Step 1: Empty all gas from fuel tank and pump primer bulb on stock carb to purge fuel from carb.

Step 2: Remove these stock items: fan cover, engine shroud, air filter, carburetor, and intake manifold. Disconnect throttle cable from stock carb

and unhook fuel lines. Wipe cylinder surface clean.

Step 3: Install HP intake manifold and new gasket. Make sure to line up the small hole in the bottom of the gasket with the small hole in the

cylinder. The manifold must also line up with the hole. Most manifolds have a hold on top and bottom, so there is no difference in they way it is

mounted. It is recommended to use Lock-tite on the screws that hold the manifold on.

Step 4: Remove the throttle cable bracket from the HP carb. Install the throttle cable into the bracket and secure it using the supplied 6mm nut.

Slide the spring over the end of the throttle cable, it should set against the 6mm nut. Pull the spring back and hook the end of the cable into the

swivel on the HP carb. Now re-install the bracket onto the HP carb.

Step 5: At this point it is best to make sure that the throttle operates smoothly and completely. Be sure that the carb is closing all of the way

when the throttle is released and that it also fully opens. There is an idle adjustment screw that stops the carb from closing all of the way. It is best

to back this screw out when testing the opening and closing of the throttle. The idle screw is the larger of the 3 adjustment screws on the carb, the

end of it is tapered and the throttle shaft pulley rests against it to set the idle. You may also need to bend the throttle cable bracket to obtain proper

operation. It is also best to spray WD-40 or some other type of lubricant on the throttle linkage at the carb. This will cure most sticky throttles.

You should always keep the throttle linkage lubricated in the future.

Step 6: Install the HP carb using the stock bolts and either a velocity stack or the stock air box bottom. The fuel circulation bulb on the carb

should face up. The side on the carb that is rounded where it goes into the throat of the carb should face the air filter. When installed the adjustment

screws should be on the pull start side of the Go-Ped®. Make sure that the mounting screws do not go all the way through the intake manifold

and make contact with the cylinder. This will cause the Go-Ped® to not start. This has the same affect as pressing and holding the kill switch. If

the bolts are too long, you will need to add washers onto the bolt before installing them thru the velocity stack and carb.

Step 7: Install the fuel lines with the blue line on the fitting on the bottom of the carb and the yellow line on the fitting on the top of the carb.

Install the remainder of the air filter system.

Step 8: You will now need to trim the engine shroud so it does not interfere with the operation of the throttle. You will need to try p utting the

shroud on to see where it interferes with the linkage. You can then carefully trim it a little at a time, while trying to fit it on. Also, make sure to

check for interference at all throttle positions. Install the shroud when it is sufficiently trimmed.

Step 9: You can now re-install the fan cover and pour gas into the fuel tank. Pump the fuel circulation bulb on the top of the carb until you see fuel

in the bulb and fuel going back to the gas tank thru the yellow fuel line. Double check the operation of your throttle again.

Step 10: Set the adjustment screws as follows: High speed 1 turn out, low speed 1-1/2 turn out, idle screw all the way in. To set the high and low

speed, turn them all the way in just until they stop, then back them out the suggested amount. The high speed is the one with the ‘T’ and the low

speed requires a regular screw driver. The high speed needs to be adjusted for peak speed/rpm while riding, then turn it out 1/16 of a turn. Never

adjust the high speed by free revving with the back wheel off of the ground and holding the throttle wide open while adjusting the screw. Flywheels

can explode with excessive rpm from free revving! The low speed should be adjusted for good throttle response when initially accelerating.

If the engine does idle and it is set too high, turn the idle screw out to set. Generally though, if you want your Go-Ped® to idle, you will have to

leave the idle screw turned in all of the way and then turn the low speed screw in until the desired idle speed is attained. But, when the HP carb is

adjusted to idle, the low speed adjustment may be lean causing hesitating when accelerating. When tuned for best performance, the engine might

not idle.

Basics:

High speed (’T’) setting 1 turn open from all the way in

Low speed (slotted) setting 1-1/2 turns open from all the way in

Turning the high or low speed in is leaner, which gives the engine less

fuel. Too lean on the high speed can result in a piston seizure at high

rpm. Too lean on the low speed will result in hesitation during acceleration.

Too rich (screw out to far) will result in gurgling and/or a

fouled spark plug.