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Scooters - 50cc => zx50 => Topic started by: MarcusB on July 12, 2018, 08:17:26 AM

Title: Will not start
Post by: MarcusB on July 12, 2018, 08:17:26 AM
My ZX Will not start. The sparkplug is moist, and has got spark.

I can only measure halfe the recomennded preassure in cylinder (4kg cm2)

What would be the mest step recomended? Can the reed’s be faulty?
Title: Re: Will not start
Post by: eamartin on July 12, 2018, 11:38:27 AM
When was the last time the machine ran correctly?
Title: Re: Will not start
Post by: MarcusB on July 12, 2018, 05:36:07 PM
I dont know, i got it for free...

Will not start with Ethergas either.

I have followed the service trouble manual, and got stuck on the compression.

How can i test if the spark is good enough?
Title: Re: Will not start
Post by: CROSSBOLT on July 12, 2018, 07:11:27 PM
Comes sion test fails. Now find out why:

2x: rings stuck or broken, cylinder scored, hole in piston, restricted intake, restricted exhaust, reed valves staying open or closed, rotary valve broken or out of time

4x: valves staying open, valves burned, cam not turning, hole in piston, scored cylinder, restricted intake, restricted exhaust, rings stuck or broken
Title: Re: Will not start
Post by: eamartin on July 12, 2018, 10:56:46 PM
My ZX Will not start. The sparkplug is moist, and has got spark.

I can only measure halfe the recomennded preassure in cylinder (4kg cm2)

What would be the mest step recomended? Can the reed’s be faulty?
That's clearly ridiculously low compression.  I'd remove the head and cylinder to have a look at the cylinder, piston and rings.
Title: Re: Will not start
Post by: MarcusB on July 13, 2018, 04:35:49 AM
Thanx, i ordered new gaskets and rings just inncase Will brand it down soon. Will let you know asap
Title: Re: Will not start
Post by: MarcusB on July 23, 2018, 10:24:15 AM
The piston had a little hole, the rings where broken. But the cylinder was ok, so i changed Pistons and rings, and all the gaskets. Started right away.

Thanx!
Title: Re: Will not start
Post by: CROSSBOLT on July 28, 2018, 08:56:54 PM
 ;D