moyo64
1st Class Ticket
Posts: 70
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Post by moyo64 on Jun 25, 2012 20:33:31 GMT
Hi All
Me again,
Vespa px125 1978
my kickstart has slipped and is a lot lower then it should be.
im getting ready to split the crankcase and have ordered a new pinion and spring.and also new gaskets.
Is there anything else i should order or be aware of before i start.
i dont want the scoot of the road for to long !
Thanks
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Post by kru251 on Jun 25, 2012 21:44:26 GMT
Firstly, where's the plug showing as good? Resting on the block when the engine is kicked over? Well that's no sure bet that it works under compression IN the block. But let's say that that plug is fine. If there's good compression then it's got to be a lack of fuel. I'd be starting there (no pun intended). Sure the misfire wasn't just a lack of fuel due to filter/silt build-up in the carb jets in the first place starving the engine of fuel.? A lot of very tiny rust particles can form and get sucked through in 34 years!!!!
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Post by sbwnik on Jun 25, 2012 22:25:49 GMT
Check the wiring is in correctly, you can get a good spark with the white not in correctly or broken.
Put the original CDI back on, see what happens. Just because something is new, it doesn't automatically follow it works properly. Especially with scooter components.
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moyo64
1st Class Ticket
Posts: 70
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Post by moyo64 on Jun 26, 2012 6:23:05 GMT
Thanks for your replys,
I have checked the compression with a tester and that is fine,
I will strip the carb down and give it a good clean.
And also put the old cdi back on,
i will keep you updated
thanks once again.
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bsr65
High Number
Posts: 114
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Post by bsr65 on Jun 26, 2012 9:18:30 GMT
the early px 125 s had points, might be worth checking the gap and contacts for wear/ dirt.
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Post by sbwnik on Jun 26, 2012 17:50:54 GMT
If it's got a CDI then it's an electronic ignition model. Points models have HT coils.
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moyo64
1st Class Ticket
Posts: 70
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Post by moyo64 on Jun 26, 2012 20:13:14 GMT
ive put the old cdi back on and still got a spark,re-checked all the wiring,still got a good spark,cleaned the jets,the fuel is getting to the plug as it has fuel on it and smells of fuel.
Im losing the will to live lol
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Post by sbwnik on Jun 26, 2012 20:20:10 GMT
Stupid question:
You did change the plug didn't you?
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moyo64
1st Class Ticket
Posts: 70
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Post by moyo64 on Jun 26, 2012 20:30:28 GMT
Yep,brad new plug !
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moyo64
1st Class Ticket
Posts: 70
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Post by moyo64 on Jun 27, 2012 18:20:54 GMT
After doing some research is it possible that the timing could be out ?
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Post by sbwnik on Jun 27, 2012 18:28:55 GMT
Not if it was running before...
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moyo64
1st Class Ticket
Posts: 70
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Post by moyo64 on Jun 27, 2012 20:11:43 GMT
ok thanks for that,back to the drawing board then ?
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Post by sbwnik on Jun 27, 2012 21:16:43 GMT
What state are the piston rings in? Measure the gap, see what that says.
Failing that, try a different stator.
Without seeing it, it's hard to diagnose.
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moyo64
1st Class Ticket
Posts: 70
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Post by moyo64 on Jun 28, 2012 6:17:27 GMT
Thanks for your help,the piston rings are all brand new been replaced approx a month ago.
I will br removing the flywheel tonight to see if that sheds any light
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Post by sbwnik on Jun 28, 2012 9:35:35 GMT
Change the lead and plug cap first, should have mentioned that earlier.
One other thing.. Disconnect the green wire that runs up the chassis from the cdi (not hte one from the stator) See if it will fire up like that.
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moyo64
1st Class Ticket
Posts: 70
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Post by moyo64 on Jun 30, 2012 14:55:38 GMT
Hi All
Problem fixed, it was a broken woodruff key on the shaft,which knocked all the timing out.
Thanks for all your advice.
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Post by sbwnik on Jul 2, 2012 18:26:46 GMT
Doh! Don't believe we all missed that one....
Tighten it up properly!
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moyo64
1st Class Ticket
Posts: 70
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Post by moyo64 on Jul 3, 2012 20:47:46 GMT
All tight lol.
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Post by kru251 on Jul 4, 2012 23:14:19 GMT
It's what torque wrenches were made for!!!
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