Question about Road Motorcycles
Hi, Frank the following applies to carbureted also fuel injected models and the usual suspects are:
1. Severely discharged or damaged battery, 9 volts or lower.
2. Failed alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Failed main circuit breaker or ignition switch, check for loose connections and continuity.
5. Failed system and or ignition relay, check for continuity.
6. Failed ignition coil, ignition/electronic module.
7. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.
9. Air/fuel mixture screw improperly adjusted.
10. Water or dirt in the fuel system, carburetor or filter.
11. Restricted, blocked or kinked fuel line.
12. Fuel tank empty.
13. Gas cap is not venting properly or fuel tank venting system blocked.
14. A failed fuel pump, pressure regulator and or fuel injectors.
15. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
16. Needle and seat stuck closed in the float bowl.
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Posted on Feb 12, 2016
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Posted on Jan 02, 2017
Check for a steady supply of fuel to the carb. Could be a blocked or pinched fuel line. Very possible that the float needle and seat are worn, causing the valve to remain closed or partially closed. When this happens the fuel bowl runs out of fuel causing the engine to die. Then fuel trickles back in while sitting and slowly fills the bowl again, allowing the engine to restart. Also be sure that the float level is set properly and that the float pivots freely. Most small engine carb floats are set to shut off the fuel when the float rises in the bowl to where the flat surface on the float is parallel to the bowl mounting surface. If the float is set close to this, don't try to adjust it. If your float needle has viton (rubber like) tip, be sure that it is not deformed. Never press on the needle because it will deform the tip, causing the valve to stick open or closed. Many times you can buy just the float needle and seat either OEM or aftermarket.
Posted on Feb 03, 2010
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