| Problem | Solution |
| Overflow of Fuel | see solution |
| Shortage of Fuel flow | see solution |
| Poor idling or stalling | see solution |
| Poor running at low speed (under 1/4 throttle opening) | see solution |
| Poor running at intermediate speed (just above 1/4 throttle opening); hesitation | see solution |
| Poor running at medium speed (1/4-3/4 throttle opening) | see solution |
| Poor running at high speed (1/2 throttle opening) | see solution |
| Hesitation; runs worse when warm | see solution |
| Fuel consumption | see solution |
| Operation of throttle and cable are stiff | see solution |
| Operation of enrichener | see solution |
| Hard starting (cold engine) | see solution |
| Hard starting (warm engine) | see solution |
| Overflow of Fuel top | ||
|
Clogged Needle Valve |
---------- |
Disassemble and Clean |
|
Clogged Air Vent |
---------- |
Clean Air Vent Passage |
|
Abrasion of Needle |
---------- |
Replace |
|
Excessive Raised Fuel Level |
---------- |
Replace Valve Seat With Smaller Inlet Diameter |
|
Pressurized Fuel Tank |
---------- |
Check Vent System on Tank |
| Shortage of Fuel Flow top | ||
| Check Gasoline Supply |
---------- |
Refuel |
| Closed Fuel Valve |
---------- |
Turn Valve On |
| Fuel Inlet is not Hooked up Correctly |
---------- |
Check Fuel Inlet |
| Needle Valve Clip is not Assembled |
---------- |
Correctly Assemble |
| Shortage of Fuel Inlet |
---------- |
Replace Fuel Fitting |
| Poor Idling of Stalling top | ||
| Incorrect Adjustment of Pilot Screw |
---------- |
Adjust |
| Idle Speed Adjusted Too Low |
---------- |
Raise Idle Speed |
| Incorrect Adjustment of Air Screw |
---------- |
Adjust |
| Air Leakage From Starter Plunger |
---------- |
Adjust Starter Level and Plunger Movement |
| Air Leakage From Adapter |
---------- |
Tighten Mount Adapter |
| Clogged Slow Jet |
---------- |
Disassemble and Clean |
| Incorrect Slow System Calibration |
---------- |
Select Slow Jet and Slow Air |
|
---------- |
Adjust Air Screw | |
| Throttle Shaft and Linkage Sticking |
---------- |
Clean and Inspect; Lubricate |
| Incorrect Synchronized Throttle Valves |
---------- |
Synchronize Throttle Valves |
| Poor Running at Low Speed (Under 1/4 Throttle Opening) top | ||
| Poor |
---------- |
Select Correct Jet |
| Too Lean; No Power |
---------- |
Larger Size Slow Jet |
|
---------- |
Use Richer Jet Needle (Larger Straight Diameter) | |
| Too Rich |
---------- |
Use Smaller Jet Size |
| Runs Better Without Air Cleaner |
---------- |
Use Leaner Jet Size |
|
---------- |
Throttle Valve With A Larger Cutaway | |
| Poor Running at Intermediate Speed (Just Above 1/4 Throttle Opening); Hesitation top | ||
| Clogged Main Jet |
---------- |
Disassemble and Clean |
| Calibration Too Lean |
---------- |
Raise Jet Needle By Lowering Clip |
|
---------- |
Use Needle Jet With Higher Protrusion | |
|
---------- |
Use Needle Jet With Larger Recess Diameter | |
| Too Lean |
---------- |
Lower Jet Needle By Raising Clip |
|
---------- |
Use Needle Jet With Lower Protrusion | |
|
---------- |
Use Needle Jet With Smaller Recess Diameter | |
| Poor Running at Medium Speed (1/4-3/4 Throttle Opening) top | ||
| Too Lean |
---------- |
Use Richer Jet Needle |
|
---------- |
Replace Air Funnel For A Longer One | |
| Clogged Air Vent |
---------- |
Cleaning Required |
| Poor Running at High Speed (1/2 Throttle Opening) top | ||
| Too Lean |
---------- |
Use Larger Main Jet |
|
---------- |
Use Richer Jet Needle | |
|
---------- |
Replace Air Funnel For A Longer One | |
| Clogged Air Vent |
---------- |
Cleaning Required |
| Hesitation, Runs Worse When Warm top | ||
|
Too Rich |
---------- |
Use Smaller Main Jet |
| Fuel Consumption top | ||
| Carb Bore Too Large |
---------- |
Replace With Smaller Bore |
| Starter Plunger Seal |
---------- |
Replace Seal |
| Calibration |
---------- |
Use Screen Type Needle Jet |
|
---------- |
Lower Jet Needle By Raising Clip | |
|
---------- |
Use Smaller Tapered Jet Needle | |
| Operation of Throttle and Cable are Stiff top | ||
| (Maul Tech can cut your spring on any stiff Carburetor to your liking) | ||
| Wire Cable Twisted or Pinched |
---------- |
Eliminate Problem |
| Tensioned Inner Wire of Cable |
---------- |
Adjust Proper Play of Inner Wire |
| Damaged Bearing |
---------- |
Replace |
| Dusty Bearing, Dusty Throttle Valve |
---------- |
Disassemble and Clean or Replace and Lubricate |
| Dusty Throttle Valve |
---------- |
Disassemble and Clean or Replace |
| Rubber Seal of Throttle Shaft |
---------- |
Replace |
| Return Spring Force Too Strong |
---------- |
Use Softer Spring |
|
---------- |
Shift Position of Spring (CR's Only) | |
| Damaged Floating Valve |
---------- |
Replace |
| Stiff Only at Wide Open Throttle |
---------- |
Adjust Clearance Between Body and Linkarm |
| Operation of Enrichener top | ||
| Warped Starter Level |
---------- |
Replace |
| Clogged |
---------- |
Disassemble and Clean |
| Hard Starting (Cold Engine) top | ||
| Clogged Pilot Jet | ---------- | Clean Pilot Jet |
| Lean Starter System |
---------- |
Replace Starter Jet With Larger Size |
| Worn out Intake Valves |
---------- |
Replace with new valves |
| Incorrect Valve Lash |
---------- |
Adjust Valves to Specifications |
| Lean Mixture Due to Open Throttle Valve |
---------- |
Adjust Throttle Opening or Idle Screw |
| Hard Starting (Warm Engine) top | ||
| Over Use of Throttle While Engine is Warm |
---------- |
Stop Pumping the Throttle When Starting |
| Over Rich Starter System |
---------- |
Replace the Starter Jet With Smaller One |
| Shortage of Air Intake |
---------- |
Adjust Throttle Valve Opening or Idle Screw |
| Valves are too loose |
---------- |
Adjust Valves to specifications |
| Flooded Engine |
---------- |
Hold Throttle Wide Open and Kick Engine Over 10 Times |
