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Engine wont start

My beta 50rev won't start with the exhaust on. If I remove the exhaust the bike start fine and I put the exhaust on with engine running it runs without any problems but when it's left over night I have to remove the exhaust again to start it

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  • Beta Master
  • 43,868 Answers

Hi, Antony and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Discharged battery, check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
8. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
9. Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
10. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2 and/or BAS).
11. Security alarm needs a reset.
For more information about your issue, please visit the websites below. Good luck and have a nice day.
50CC Scooter Wont start
Startup Troubleshooting Starting Your Scooter 1 7
Fix Chinese 49cc Scooter that won start
http://www.lewisportusa.com/manuals.htm
http://www.betamotor.com/en/support/manuals

Posted on Dec 14, 2015

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Posted on Jan 02, 2017

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DickCanFixIt
  • 948 Answers

SOURCE: engine misfire and cutting out when running at normal engine temp

Make sure your fuel tank vent is not plugged. To see if this is the problem, the next time the bike starts acting up, stop and open the fuel tank. If you hear a whoosh of air being sucked in you know your vent is plugged.

The C8HA is still available, it is NGK stock number 2168.
Good luck.

Posted on Feb 20, 2009

Triplefuel
  • 4 Answers

SOURCE: engine management light

Engine management light was on permernantly after replacing battery, took advice and let bike idle until thermo fan started, turned bike off and let thermo fan stop, restarted bike and engine management light went off. this proceedure resets engine management system. GREAT ADVICE thanks.

Posted on May 03, 2009

  • 130 Answers

SOURCE: Bike wont Start.

You can accidentally UNPLUG the tip sensor if you remove/jar the front fairing. Verify that it is plugged in. If you uninstalled the tip sensor, make sure it is installed in the correct position. Here's the service manual next steps after that check: First thing the SM states when you turn the key and get no fuel pump "noise" is to inspect the fuel pump by measuring the voltage between the terminals. If there is battery voltage, check the main fuse (20A), sub fuse (10A), engine stop switch, fuel cutoff relay (relay box under left middle cowl), engine stop relay, bank angle sensor, and finally, ECM.

Posted on May 06, 2009

herbmeister
  • 7 Answers

SOURCE: Engine cutting out when open throttle. YAMAHA NEOS 50cc MOPED

i had a simuler problem with my honda cr 250 moto-x bike it would start fine and you could keep it ticking over with the throttle(i have deliberatly unscrewed the tickover in case i come off,it will cut out) when i got on it,it would go for about 400-500 metres then splutter and die and not start again for around 5 mins. i immediatly knew it was a fueling problem. so after stripping the carb and giving it a good clean out i was baffled when i got back on and it still done the same. i then dismantled the fuel tap cleaned it all out and put it back together and tested it,it was very very slow so i unsrewed my fuel cap a little and was greated with the familur gush it should deliver. problem solved! the vent in my fuel cap had crystalised up,so the fuel was coming out but the air was not getting in,causing a vacuum and slowing down the flow and basically emptying the carb quicker than it can fill back up!!! clean your carb,fuel tap and any vents in your cap or tank. if this does not work then your bike must be over fueling or low on compression.

Posted on Sep 18, 2009

wd4ity
  • 4565 Answers

SOURCE: High Idle On Start-up.

Most fuel injected motorcycles do start up in a "fast idle" mode. Although I don't know much about fuel injection on Harleys (H-D will not tell you much about it unles you are one of their technicians), I don't think the system is equipped with an engine temp sensor. Since the crank case sensor get it's pulses from pockets cut into the outer edge of the left side flywheel half, the sensor will have oil on it.

Posted on Sep 24, 2009

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