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Post by markbsac on Feb 21, 2013 8:31:30 GMT
going along doing a steady 60-65 on a long straight road the scoot just cut out and stopped ...coasted onto the side of the road and she started up again first time.she runs sweet as a nut ticks over perfect so im a bit stumped !!
any ideas
thanks in advance
mark
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Post by pxguru on Feb 21, 2013 9:02:59 GMT
Sounds unusual but it happens to us all  Did it feel like you just switched the key off? If it is this kind of cut out, the first thing is new spark plug regardless of anything else and second strechy CDI wires from the stator..... |
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Post by markbsac on Feb 21, 2013 9:10:08 GMT
yes just like i had turned the ignition off...im going down the garage in a mo...i thought about the dci myself..will look at the plug first see what it tells me...thanks for your help
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Post by markbsac on Feb 21, 2013 9:52:06 GMT
plug is brown, electrode ect all looks in good order....but an old plug so changed it anyway...gonna go for a blast now
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Post by kru251 on Feb 21, 2013 16:15:02 GMT
Only takes a tiny piece of carbon to bridge a spark plug gap..........then go again. Yes, new plug is always a good bet!!!!
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Post by markbsac on Feb 21, 2013 17:48:20 GMT
the whole of the plug is very brown and quite rough on the electrode...im gonna buy a cdi unit for what they cost i may as well also change the HT lead all in the coming weeks
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Post by Robjack on Feb 21, 2013 18:25:47 GMT
Exact same thing happened to me about 5 years ago. I kept the clutch engaged to try to kick it back into life as it coasted to a stop, but no joy. It restarted after half a dozen kicks and has run perfectly ever since. It felt like fuel starvation to me, and I assumed there was a blockage somewhere that just cleared itself.
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Post by kru251 on Feb 21, 2013 21:43:19 GMT
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Post by Robjack on Feb 21, 2013 21:55:45 GMT
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Post by kru251 on Feb 22, 2013 22:56:36 GMT
I remember being with an (ex) mate who liked Guinness so all us mates did the rounds one Christmas eve. He ended up drinking 11 pints of that stuff, genuinely. He was in a dreadful way. Later that week we all met up and he said he didn't really come round 'till boxing day. I'd believe that too having seen the state of him in the early hours of Christmas Day. Ex mate? Yeah well he got his revenge by sleeping with my partner, but she was as much to blame too ha ha  |
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Post by markbsac on Mar 1, 2013 16:31:43 GMT
ok guys just wanted to share this with you..guy that ported my px and sorted my holed piston ect ect...said drill a hole larger in your petrol cap...and take some foam out from under your seat to create a larger airflow..done this...scoot not cut out since :-)
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Post by sbwnik on Mar 1, 2013 20:38:10 GMT
I've no idea how often I've had this, and I've never found out what's caused it. Here's my usual list of suspects, but I've never proved which (I suspect it's varied as it's happened at one time or another on most scooters I've owned)
Whisker across the plug.
Bit of muck going through the carb.
CDI on it's way out
HT lead damaged
Plug cap bounce
Stretched/broken wire to CDI
And it's probably still something else!
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Post by kru251 on Mar 1, 2013 22:03:44 GMT
ok guys just wanted to share this with you..guy that ported my px and sorted my holed piston ect ect...said drill a hole larger in your petrol cap...and take some foam out from under your seat to create a larger airflow..done this...scoot not cut out since :-) You should NEVER do two modifications at the same time as you don't know which cured the issue now. I'd go with the tank vent via the cap then, but if the foam needed removing then Piaggio would have done it before! They can't though help a blocked fuel cap air vent in the design office!!!! |
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Post by markbsac on Mar 1, 2013 23:48:10 GMT
good point so i may buy a new fuel cap and replace the foam ;D
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Post by sbwnik on Mar 2, 2013 1:13:58 GMT
Trimming the seat foam shouldn't make any difference. The volume from carb mouth out to the hole at the front of the seat is a fixed volume that is greater than the intake to the carb. This supplies a constant flow, easily made up by drawing from the surrounding area.
Or that's the theory...
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Post by markbsac on Mar 2, 2013 13:19:58 GMT
well is it weird that this seems to have at the moment cured the problem ? :-)
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Post by sbwnik on Mar 2, 2013 13:55:12 GMT
Agreed, but as I said 'that's the theory'!
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Post by markbsac on Mar 2, 2013 14:09:58 GMT
not being mechanically minded i still dont get it...lol :-)
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Post by sbwnik on Mar 2, 2013 15:46:24 GMT
The one thing you don't want on an engine is air being forced through it (Let's leave superchargers and turbos out of this, for the sake of it only being a Vespa engine!).
If you start changing the rate at which it goes through, you start running the risk of a lean engine as the fuel can't mix fast enough, and the faster you go, the more air would be forced in. An airbox (which - someone correct me if I'm wrong - is known as a plenum chamber) keeps the air at a constant pressure, meaning the engine draws both fuel and air at a constant rate.
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Post by markbsac on Mar 2, 2013 16:32:03 GMT
lets hope mine will be ok
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Post by sbwnik on Mar 2, 2013 16:46:23 GMT
Are you running the filter on top of the carb? If so, that should help keep the air constant.
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Post by markbsac on Mar 2, 2013 23:16:52 GMT
sbwnik.....honest its a px200 except for a stage 4 tune...bit of porting thats about it..running a simonini...nothing else done to it.
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Post by joey on Mar 3, 2013 10:10:07 GMT
I drill a 5mm hole in the top of fuel cap now as a matter of course, late ones just seem to be quite restrictive.......... as the need for more fuel increases the fuel cap just doesn't seem to allow enough air into the tank which can end up creating a vacuum and restricts fuel flow.
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rob1967
2nd Class Ticket
Why does mine always stop running?
Posts: 34
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Post by rob1967 on Mar 3, 2013 20:54:20 GMT
My dear P200 was brought out of the garage yesterday as the roads were dry and the sun shining. It has been indoors since November but I have been out to start it and run it every couple of weeks so it has not been completely 'idle'. Got on the road and after about a mile it started to cough, splutter, backfire and fart! Stopped and with a bit of revving the engine kept going but didn't want to know when trying to actually ride it!  Ended up walking back with it to the house. Cleaned carb and plug, checked fuel was getting through (it was) but when trying to get it running just got the backfire treatment and a rather nasty puff of smoke! Any clues as I have run out of ideas.  Many thanks Rob |
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Post by sbwnik on Mar 3, 2013 21:57:51 GMT
Woodruff key sheared.
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Post by kru251 on Mar 4, 2013 17:11:06 GMT
Also, the going rate for loss of octane rating on fuel is about 1% per week with modern (cr*p) fuel. More if it's warm.
So having stored it since November.........................!!!
Drain tank and use that for cleaning or whatever or if tank contents is low now add new stuff!!
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rob1967
2nd Class Ticket
Why does mine always stop running?
Posts: 34
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Post by rob1967 on Mar 4, 2013 18:25:36 GMT
I hope it is not a key of any description! I will drain the fuel tonight and see if that helps. I will keep you posted (just in case anyone is hanging on my every word!) Thanks Rob |
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Post by pxguru on Mar 5, 2013 6:24:46 GMT
Rob, Take the flywheel off and have a look at the woodruff key before it gets expensive! |
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Post by super150 on Mar 5, 2013 8:56:13 GMT
Same thing happened to me…kick, kick, fart.… woodruff key..both sides!
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rob1967
2nd Class Ticket
Why does mine always stop running?
Posts: 34
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Post by rob1967 on Mar 5, 2013 21:18:03 GMT
Thanks. Will look at weekend. Life is getting in the way at the moment!
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Did it feel like you just switched the key off?
