Question about 2005 Cpi Supermoto 50

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Bike has no power after replacing cdi/spark plug/voltage regulator and spark plug coil

Bke would not go past 20 mph at full throttle and have lost power to all my lights except cluster.

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  • 8 Answers

Check the magnetos, assuming the mofrl has them.

Posted on Nov 23, 2013

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My Jonway YY50QT-6 49cc scooter voltage regulator burned up. I changed it but cant get any fire to the plug. I also changed the coil and cdi box but still dont get any spark the plug. Need help badly!


Good chance it has blown the cdi fuse ,alot of Chinese bikes have a separate fuse for the cdi unit,if it's ok I would say the generator is fried if you have had a burned out regulator.so check it for scorched wires.

Apr 15, 2015 | Jonway Motorcycles

1 Answer

1981 Suzuki gn400 no spark


I know it sounds silly, but have you checked your earth or ground wiring. If not earthed this type of problem can occur. Did the bike run before you replaced your coil etc? You could have a crook CDI
are you using multi meter mate for correct voltage readings?

Feb 09, 2014 | Suzuki Motorcycles

1 Answer

I do not have any spark at my spark plugs this after I replaced my voltage regulator


check ht cap ..check ht lead, check condition of cut out switch, check power coming from coils, check power coming from cdi unit,

Feb 16, 2013 | 1983 BMW R 100 RT

1 Answer

Took my bike out, WR450f 07 model, got to the shop and had something to eat, came out and bike wouldn't go, headlight globe was blown, actually smashed, was no spark so replaced spark plug and checked...


My thoughts...Light globes are made to withstand voltages of less than 16 volts. So if you are finding your headlight globe burnt out, it's because the system voltage has exceeded this. Have your voltage regulator replaced which will remedy the problem. Over voltage will have an effect on other electronic components such as the CDI unit and wreck your battery too.

Apr 07, 2010 | Yamaha WR 450 F Motorcycles

2 Answers

Kawasaki kx80 has no spark


hi mate replace wires/cables and put another spark plug in it could be spark plug fouling and try the cdi in another kx80 also replace hd lead from coil to sparky

May 19, 2009 | kawasaki Full Suspension Mountain Bike Men

2 Answers

Bike wont fire. has no spark


Sounds like you have all the right new parts. I would double check the wiring. Sounds like that is where the problem is at unless the new coil is bad.

May 10, 2009 | Pit SSR 110CC Pro Beginner Bike

2 Answers

No spark


Hi and welcome to FixYa,

To my understanding, the problem is 'no spark' yet the engine cranks. Generally, to consider are:
  • pulser coil (least likely);
  • ignition coil (likely);
  • interlocks (likely);
  • CDI (most likely).

Offhand, the CDI would be the main suspect. Since the CDI is sealed, it is not possible to do component level checks. The only way to check if the CDI is good is to check the external connections; if they are good and yet no spark, then the CDI is bad.

How to check the above:
  • to check the pulser coil, measure the low voltage coming from it using an analog/needle type AC voltmeter. While cranking, it should show a flickering low voltage;
  • to check the ignition coil, use a continuity tester. Primary should measure 3 ~ 5 ohms while primary to the high voltage end would measure 15 ~ 18 kilo ohms;
  • the ignition coil has 1 terminal connected to the IGN +12 while the other terminal is connected to the CDI. This should have a pulsating voltage when cranking.
  • all the interlocks could be checked with a continuity tester. Please note that most interlocks has a diode connected in series with their wires.
The interlocks include:
  • clutch switch;
  • side stand switch;
  • neutral light switch.

Good luck and thank you for using FixYa.

Apr 21, 2009 | 1997 kawasaki ZX-6R Ninja

1 Answer

No spark


There are a # of things that can take your spark out, first I would see if you have power to your ignition coil (100V+). If none there you need to isolate your ignition switch (unplug it or take it out of the equation) and jump your starter solenoid manually or try pushstarting the bike. If still nothing check for voltage going into your CDI box, if none check for voltage out of your stator (over 100V) and your trigger or pulse coil (over 3V). If you find voltage at the stator and not the trigger replace the trigger and vice versa. If there is voltage for both replace CDI box (but be cautious to verify good ground for CDI box and ignition coil). If you find voltage out of your CDI box (over 100V) replace your ignition coil. Good luck!

Apr 11, 2009 | 1992 Suzuki GSX-R 600

3 Answers

Ktm 450sxf 07 wont start


The decompression valve has come apart in the engine. Tear it down!

Mar 29, 2009 | 2008 KTM 450 SX-F

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