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Scooters - 50cc => zx50 => Topic started by: danovr on November 13, 2013, 10:13:43 AM

Title: ZX50 Super Fever won't start. (Solved)
Post by: danovr on November 13, 2013, 10:13:43 AM

 ;DHello
I have just bought  a second hand super fever unseen. The lady who sold it said it worked ok, but stalled after a while. I thought this would be a piece of cake. However, now the scooter won't start at all. The spark is good, but it will not fire. I've tried with start gas, petrol down the spark plug hole, cleaned the carb and changed the battery. Still not even a single cough neither with kick or starter. I think the compression is ok for a 50 cc. I also have downloaded the workshop manual, but I'm running out of ideas. Does the CDI influate the ignition timing?

Any tips will be greatly appreciated, thanx.
Daniel

Title: Re: ZX50 Super Fever won't start. Please help me!
Post by: danovr on November 13, 2013, 03:46:05 PM

I tested the compression now, and it was 120 psi. Shouldn't this be sufficient to start?

I hope someone in here can give me an idea of what to do next.

Title: Re: ZX50 Super Fever won't start. Please help me!
Post by: LoveMyKymco on November 14, 2013, 12:17:36 AM

Hi Dan, 120 is great compression. CDI definitely is for spark. You are sure you have spark?

Title: Re: ZX50 Super Fever won't start. Please help me!
Post by: danovr on November 14, 2013, 08:29:57 AM

Thanx for the reply LoveMyKymco.
Yes I have spark, but is it possible that it can come at the wrong time?
Is it possible to measure the compression below the piston?

Title: Re: ZX50 Super Fever won't start. Please help me!
Post by: naughty lee on November 14, 2013, 01:09:48 PM

Double check your plug, remove supressor cap and refit. Gap plug to 0.9mm. Also check fuel feed pipe for kinks/nips and blocked inline filter.

Title: Re: ZX50 Super Fever won't start. Please help me!
Post by: danovr on November 22, 2013, 12:00:11 PM

Fitted a new spark plug today (br8hsa). and during the first attemt to start there was a couple of coughs. but never started  >:(

Title: Re: ZX50 Super Fever won't start. Please help me!
Post by: nomadrac on November 23, 2013, 04:56:01 PM

If you don't have a service manual, Google for it and go thru the troubleshooting in Ch. 15 for your electrical system. check resistance values against service manual specs. maybe you have a week spark, or bad CDI,  the CDI is powered by AC voltage, check generator too

Title: Re: ZX50 Super Fever won't start. Please help me!
Post by: naughty lee on November 25, 2013, 01:21:34 PM

Try just using the kickstart WITHOUT any throttle, if it won't go after a couple of dozen kicks, it's possible that the last owner might have dicked about with the carb settings.
Where are you?

Title: Re: ZX50 Super Fever won't start. Please help me!
Post by: danovr on December 01, 2013, 05:01:37 PM

Finally got it going now :D
Thanks for all your help.
It was actuallu the reed valve that didn't close properly.

Title: Re: ZX50 Super Fever won't start. (Solved)
Post by: LoveMyKymco on December 02, 2013, 05:36:23 PM

Nice and cheap fix. Congrats and enjoy the scoot!

Title: Re: ZX50 Super Fever won't start. Please help me!
Post by: nomadrac on December 05, 2013, 02:44:14 AM

Quote from: danovr on December 01, 2013, 05:01:37 PM

Finally got it going now :D
Thanks for all your help.
It was actuallu the reed valve that didn't close properly.

. How did you figure the reed valve wasn't functioning correctly?

Title: Re: ZX50 Super Fever won't start. Please help me!
Post by: danovr on March 08, 2014, 11:34:35 PM

Quote from: nomadrac on December 05, 2013, 02:44:14 AM

. How did you figure the reed valve wasn't functioning correctly?

I had it out, and could blow through it both ways. Dismanteled and cleaned it, and it worked.