Benelli ZAFFERAN 250, Service Manual

Page: 160 / 187

160
17.2.3.6 Cleaning
Remove the cover at the bottom of the throttle valve and clean the body with carburetor cleaner (3M
product suggested). Spray cleaner on the inner wall of the throttle valve and remove dust and
carbon deposit lightly with a brush. Do not block the bypass with impurities.
Note:
Do not block the bypass with impurities.
If idle screws are removed and cleaned, assemble idle screws in following order:

Install o-ring 1 on the idle bypass screw

Install spring, washer, o-ring 2 on the idle bypass screw

Install the above idle bypass screw on the throttle valve
After the idle screw is cleaned and assembled, use the diagnosis tool and adjust the idle speed.
Note:
Note: a new o-ring shall be used every time of installation.
17.2.3.7 Installation of the Throttle Valve
Install the throttle valve in reverse order and pay attention to the following:

Adjust the throttle cable.

Ensure all removed components are installed in place.

Re-install all necessary parts.
17.2.3.8 Precautions

Do not spray any cleaner into the TPS throttle position sensor.

Use the throttle cable to open the throttle valve block.

Do not insert any tool or stick into the throttle valve hole to keep the valve block open. It
causes deformation of the valve block and damage to the inner wall of the throttle valve.

Remove carbon deposits around the valve block to maintain air flow required by idle speed
setting.

Do not adjust the position of idle screws.

Replace o-rings once disassembled.
17.2.3.9 Instructions
Instructions on the throttle valve assembly
Instruction Cause
DO: be careful when the throttle
valve connector is used.
Avoid damage to the connector.
DO: avoid any liquid pollution to the throttle
valve.
Ensure normal work.
DO: take and install only one piece of throttle
valve from the component tray.
Possible damage to components.
DO: use a label to describe any problem
related to any fallen, damaged or
unqualified throttle valve (within warranty
range).
Accurately analyze causes as soon
as possible.
DO: remove and discard protective cap Protect the system from pollution and
keep it working normally.