Remove the float chamber from the carburetor, using a Phillips-head screwdriver.Remove the main jet, located at the end of the center tower on the bottom of the carburetor, using a 90-degree angled flat-head screwdriver. Stop the engine upon completion of the test ride and let it cool for 10 minutes.Unscrew the throttle valve cylinder cap from the top of the carburetor by hand.
The main jet is too small, creating a lean air-fuel mixture, if the engine speed increases with the choke closed. Honda CT90 A - TRAIL 90 CARBURETOR Diagram. $18.53 $18.09 Add . BikeBandit.com offers thousands of 1973 Honda Trail Sport 90 ST90 CARBURETOR OEM parts to repair or restore your 1973 Honda Trail Sport 90 ST90 CARBURETOR to original factory condition. Both motorcycle styles used a simple carburetor to provide a combustible mixture of air and fuel to the engine.
75 for a CT90 model, main jet into the center tower.

Please read and agree to the privacy policy Push the jet needle out of the throttle valve. Loosen the float chamber drain screw on the bottom of the carburetor, using a flat-head screwdriver. The tachometer should indicate an idle speed of 1,300 to 1,500 rpm. Open the throttle completely and close the choke. Stop, then turn the air screw clockwise one-eighth of a turn.Check the engine idle speed again, using the inductive tachometer. Select your address # Description Price Qty; 1: GASKET SET 16010-096-305 . The carburetor … Pull the spring out of the throttle valve, then pry out the jet needle retaining clip from the inside of the valve, using a flat-head screwdriver. Reinstall the float onto the carburetor and turn the fuel valve on.Restart the engine and let it warm. The motorcycle should accelerate smoothly and without hesitation. Navigate your 1973 Honda Trail Sport 90 ST90 CARBURETOR schematics below to shop OEM parts by detailed schematic diagrams offered for every assembly on your machine. OEM is an acronym for original equipment manufacturer, which means that the 1973 Honda Trail Sport 90 ST90 CARBURETOR OEM parts offered at BikeBandit.com are genuine Honda parts. Honda's 1970 CT-series, consisting of the Trail 70 and 90, were small single-cylinder motorcycles that were intended to be used both on and off of paved roads.

Listen to the engine for an increase in rpm. Alternatively, listen to the engine to roughly estimate the idle rpm. We're here to help you keep your Honda CT-90 or CT-110 in shape and in motion.We provide technical information, links to lots of resources that will help you find parts, service or advice, and if we don't know the answer to your CT90-related question, someone on our large mailing list probably does!

Honda's 1970 CT-series, consisting of the Trail 70 and 90, were small single-cylinder motorcycles that were intended to be used both on and off of paved roads. Skip this step if the motorcycle did not hesitate during acceleration or did not emit black smoke.Pull the E-shaped clip out of the grooves at the top of the jet needle, using needle-nose pliers. Release the throttle immediately and open the choke.Stop the engine and let it cool for 10 minutes if the engine speed increased with the choke closed.Turn the fuel valve under the right side of the gas tank to the "Off" position. Ideally, the screw should take one and three-quarters turn before seating for a CT 70 carburetor, or one and three-eighths of a turn for a CT 90 carburetor. 1: GASKET SET 16010-096-721 . BULK HOSE, FUEL (3.5X3000) (95001-3500(95001-35001-60M) 58 main jet, while a CT90 will have a No. Readjust the idle speed as needed to return the idle speed to between 1,300 and 1,500 rpm. Replace the main jet with another jet one step larger than the No. The carburetor allowed for the adjustment of low speed operation through an air screw along the side of the carburetor, as well as an adjustable needle in the throttle valve to accommodate changes at intermediate speeds. Reinstall the jet needle, retaining clip and spring into the throttle valve, then reinstall the throttle valve and cap onto the carburetor.Take the motorcycle for another test ride. Push the clip into a grove one step closer to the top of the jet needle to reduce smoking, or one step closer to the bottom of the needle to enrich the mixture and reduce hesitation. Turn the screw clockwise to increase the idle speed, or counterclockwise to decrease the idle speed, until the engine is idling between 1,300 and 1,500 rpm.Turn the air screw, located below the throttle stop screw, clockwise until it is lightly seated, using a flat-head screwdriver. Pull the throttle valve and spring out from the throttle valve.

In Stock. $18.53 $18.09 Add .

The engine should be idling consistently without hesitation or racing.Turn the throttle stop screw, located on the right side of the carburetor's throttle valve cylinder, to adjust the idle speed, as needed to adjust the engine idle speed. Accelerate from a standstill to one-eighth throttle, then accelerate to half throttle. The motorcycle should accelerate smoothly from a complete standstill and return to an idle speed between 1,300 and 1,500 rpm when stopped.Start the engine and let it idle in place for five minutes until warm.Twist the throttle grip open to between one-eighth to half throttle.

Any hesitation is an indication of a lean air-to-fuel mixture, meaning that there is more are than fuel. In Stock.

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