TRIUMPH SERVICE MANUAL DOWNLOAD APPLICATION: Bonneville 790cc 2001 2002 2003 2004 2005 2006, Bonneville 865cc 2007, T100 790cc 2002 2003 2004, T100 865cc 2005 2006 2007, America 790cc 2002 2003 2004 2005 2006, America 865cc 2007, Speedmaster 790cc 2003 - 2004, Speedmaster 865cc 2005 2006 2007, Thuruxton 865cc 2004 2005 2006 2007 & Scrambler 865cc 2006 - 2007.


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DOWNLOAD 2001-2007 TRIUMPH SERVICE MANUAL

2001-2007  Triumph Bonneville Bonneville T100 America Speedmaster Thruxton Scrambler


CARBURETOR 4.5
GENERAL
See Figure 4-2. The carburetor is a constant-velocity, gravityfed
type with a float-operated inlet valve, a variable venturi, a
throttle stop screw (for idle speed adjustment) and a fuel
enrichment system (for starting).
Idle and transfer ports provide a balanced fuel mixture during
the transition period from stop to mid-range. A vacuum piston
controls venturi opening.
The carburetor is specifically designed to control exhaust
emissions. All jets are fixed. The idle mixture has been preset
at the factory. The idle mixture screw is recessed in the
carburetor casting. The opening is sealed with a plug
because it is intended that the idle mixture be non-adjustable.
NOTE
Adjusting mixture setting by procedures other than specified
in this section may be in violation of local regulations.
This system partially compensates for changes in the mixture
that are normally caused by changes in altitude. Because
atmospheric pressures drop as altitude increases, the pressure
difference in the upper and lower chambers is reduced;
this results in less fuel being delivered to the engine, thereby
maintaining the correct air/fuel ratio for better engine performance
and reduced exhaust emissions.
The carburetor is equipped with an accelerator pump. The
accelerator pump system uses sudden throttle openings
(rapid accelerations) to quickly inject raw fuel into the carburetor
venturi; this provides extra fuel for smooth acceleration.
ADJUSTMENT
Float Level
1. See Figure 4-3. Place carburetor on a flat, clean surface
on engine manifold side. This is the “base.” Tilt carburetor
counterclockwise 15 to 20 degrees from base until float
comes to rest.
NOTE
If carburetor is tilted less than 15 degrees or more than 20
degrees, your measurements will be inaccurate.
2. Use a vernier or dial caliper depth gauge to measure
from the carburetor flange face to the perimeter of the
float. Be careful not to push on float while measuring.
The measurement must be 0.413-0.453 in.
(10.49-11.51 mm). If measurement is not within given
dimension, remove float and carefully bend tab in order
to reposition float at proper level.
3. Install float, and recheck setting.
4. Install float bowl. Install carburetor as described in
INSTALLATION later in this section.
Check for Remedy
Restricted fuel tank vent system. Correct restricted hose. Replace vapor valve.
Loose float bowl screws. Tighten screws.
Damaged float bowl O-ring. Replace O-ring.
Damaged or leaking float assembly. Replace float assembly.
Particle contamination in fuel inlet fitting cavity. Clean and clear cavity and fuel supply tract.
Worn or dirty inlet valve or seat. Clean or replace valve and clean seat.
Improper fuel level in float bowl. Adjust float tab for correct fuel level.
Table 4-5. Poor Idling
Check for Remedy
Idle speed improperly adjusted. Adjust operating idle speed.
Inlet system air leak (faster idling). Correct as required.
Loose low speed jet. Tighten jet.
Contaminated or plugged low speed system. Clean contaminants and clear passages.
Enrichener valve not seated or leaking. Adjust, clean or replace.
Leaking accelerator pump. Repair.
Table 4-6. Poor Fuel Economy
Check for Remedy
Excessive use of enrichener system. Limit system use.
Enrichener valve not seated or leaking. Adjust, clean or replace.
Dirty air cleaner element. Clean or replace as required.
Restricted fuel tank vent system. Correct restricted hose. Replace vapor valve.
High speed riding style. Modify riding habits.
Idle speed improperly adjusted. Adjust operating idle speed.
Loose jets. Tighten jets.

Fuel level too high. Adjust float level.
Plugged or restricted bowl vent. Clean and clear passages.
Worn or damaged needle or needle jet. Replace needle or needle jet.
Vacuum piston assembly malfunction. See Vacuum Piston Troubleshooting at end of this table.
Plugged air jets or passages. Clean and clear passages.
Excessive accelerator pump output. Check and clean accelerator pump bypass orifice.
Table 4-7. Poor Acceleration
Check for Remedy
Throttle cables misaligned. Adjust throttle cables.
Inlet system air leak. Correct as required.
Restricted fuel tank vent system. Correct restricted hose. Replace vapor valve.
Restricted fuel supply passages. Correct and clear restriction.
Plugged bowl vent or overflow. Clean and clear passages.
Enrichener valve not seated or leaking. Adjust, clean or replace.
Worn or damaged needle or needle jet. Replace assembly.
Vacuum piston malfunction. See Vacuum Piston Troubleshooting at end of this table.
Plugged jets or passages. Clean and clear as required.
Fuel level (float chamber) too low. Adjust float level.
Accelerator pump leaking or no output. Repair as necessary.

Check for Remedy
Enrichener system plugged, not properly functioning or
improperly operated.
Clean, adjust, or replace; or read Owner's Manual.
Inlet system air leak. Correct as required.
Restricted fuel supply Correct fuel supply or passages.
Fuel overflow. See Overflow Troubleshooting at beginning of this table.
Plugged slow jet or passages. Clean and clear jet or passages.
Table 4-9. Poor Performance on Road
Check for Remedy
Idle speed improperly adjusted. Adjust operating idle speed.
Inlet system air leak Correct as required.
Restricted fuel tank vent system Correct restricted hose. Replace vapor valve.
Dirty or damaged air cleaner element. Clean or replace.
Enrichener valve not seated or leaking. Adjust, clean or replace.
Restricted fuel supply tract. Correct and clear restriction.
Plugged bowl vent or overflow. Clean and clear passages.
Loose or plugged fuel and air jets or passages. Clean, clear and correct as required.
Worn or damaged needle or needle jet. Replace assembly.
Vacuum piston assembly malfunction. See Vacuum Piston Troubleshooting below.
Accelerator pump inoperative. Repair as required.
Table 4-10. Poor High-Speed Performance
Check for Remedy
Inlet system air leak. Clean or replace.
Enrichener valve not seated or leaking. Adjust, clean or replace.
Restricted fuel tank vent system. Correct restricted hose. Replace vapor valve.
Restricted fuel supply tract. Correct and clean restriction.
Dirty or damaged air cleaner element. Clean or replace.
Plugged bowl, vent or overflow. Clean and clear passages.
Worn or damaged needle or needle jet. Replace assembly.
Vacuum piston assembly malfunction. See Vacuum Piston Troubleshooting below.
Loose or plugged main jets or passages. Tighten, clean, clear as required.
Improper fuel level. Adjust float level.
Accelerator pump inoperative. Repair as required.
Table 4-11. Piston Does Not Rise Properly
Check for Remedy
Piston atmosphere vent blocked Clear vent.
Diaphragm cap loose, damaged or leaking. Tighten or replace cap
Spring binding. Correct or replace spring.
Diaphragm pinched at lip groove Reposition diaphragm lip.
Torn diaphragm. Replace piston diaphragm assembly.
Piston binding. Clean piston slides and body or replace piston.
Piston vacuum passage plugged. Clean and clear passage.
Table 4-12. Piston Does Not Close Properly
Check for Remedy
Spring damaged. Replace spring.
Piston binding. Clean piston slides and body or replace piston.
Piston diaphragm ring dirty or damaged. Clean or replace piston.


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