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Motorized Bicycle Trouble Shooting Use this area to post problems that may arise, if you could use some help in figuring out what is wrong with your engine and what needs to be done to achieve top performance.

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Old 11-08-2016, 09:34 PM
68thumper68 68thumper68 is offline
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Question 80cc motor is back firing , jerking and dying.

these engine has been running fine for a week now. And today it lost power, started back firing, spitting, and died on me. Any ideas on the course of action I should take?
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Old 11-08-2016, 09:42 PM
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Agreen Agreen is offline
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Default Re: 80cc motor is back firing , jerking and dying.

Likely to be the ignition system. See if you're getting spark. If not, use a multimeter to check the resistance of the magneto. Check the condition of the spark plug, and also look for burning between the spark plug and wire. It's most likely the cdi, but at least test the other components before replacing any parts. You want to be sure.
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Old 11-09-2016, 12:00 PM
crassius crassius is offline
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Default Re: 80cc motor is back firing , jerking and dying.

I'd first check head gasket & motor mounts.
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Old 11-09-2016, 02:08 PM
Slogger Slogger is offline
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Default Re: 80cc motor is back firing , jerking and dying.

Backfiring might indicate a timing problem, I would check the magnet's woodruff key, too.
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Old 11-24-2016, 12:09 PM
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Default Re: 80cc motor is back firing , jerking and dying.

How about a slack chain ??
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Old 12-06-2016, 06:06 PM
netsharpshooter netsharpshooter is offline
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Default Re: 80cc motor is back firing , jerking and dying.

Hey, I build the Rocket Racing CDIs, I will sell you one today or tomorrow for $40 shipped. Just message me.

There is a chance your oil mix is spitting on your air filter and fouling it up. you can try removing the air filter for a bit to see if you get the juice back.
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