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Author Topic: Will not start  (Read 2460 times)

MarcusB

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Will not start
« 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?
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eamartin

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Re: Will not start
« Reply #1 on: July 12, 2018, 11:38:27 AM »
When was the last time the machine ran correctly?
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MarcusB

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Re: Will not start
« Reply #2 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?
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CROSSBOLT

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Re: Will not start
« Reply #3 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
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Karl

Three motorcycles 1960-1977 (restored a 1955 BSA)
Agility 50
Yager 200i
Downtown 300i
Navy tech, Ships Engineer, pilot and aircraft mechanic

eamartin

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Re: Will not start
« Reply #4 on: July 12, 2018, 10:56:46 PM »
Quote from: 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?
That's clearly ridiculously low compression.  I'd remove the head and cylinder to have a look at the cylinder, piston and rings.
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MarcusB

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Re: Will not start
« Reply #5 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
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MarcusB

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Re: Will not start
« Reply #6 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!
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CROSSBOLT

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Re: Will not start
« Reply #7 on: July 28, 2018, 08:56:54 PM »
 ;D
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Karl

Three motorcycles 1960-1977 (restored a 1955 BSA)
Agility 50
Yager 200i
Downtown 300i
Navy tech, Ships Engineer, pilot and aircraft mechanic

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