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PostPosted: Wed Jan 10, 2018 6:54 am 
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Hi all, my pcx has developed a fault where it is very difficult to start and when I do get it started it will only run at high revs, if it slows down or idles it will cut out.

I've done a full service, changed the spark plug, oil, belt and rollers and I thought this would solve the problem but it's now got worse and I can't ride it.

Could the problem be the spark plug cap or the ignition coil?


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PostPosted: Wed Jan 10, 2018 8:23 am 
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Maybe bad fuel or dirty fuel injector. Before I'd trouble shoot anything else mechanical, I'd drain the fuel and add fresh with a splash of fuel injector cleaner.

Some people think injectors can't get clogged because they are under pressure from the fuel pump. But what happens is that a thin coat of "varnish" or whatever you want to call it changes the injector's output from a "spray mist" to a "squirt" which isn't as combustable.

http://www.fuelinjectorcleanerhq.com/lu ... treatment/

I don't know that your problem is mechanical or simply fuel or a clogged injector, but this stuff really does work.


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PostPosted: Wed Jan 10, 2018 8:44 am 
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Miles on the engine?
Valves ever checked?
Do you use a Top Tier fuel ? - all of which have cleaners in the blend.
Oil, belt, rollers won't solve hard start issues.
Fish


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PostPosted: Wed Jan 10, 2018 8:57 am 
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Thanks for the reply's chaps I'll get some injector cleaner and give it. Fish - she's done 55000 miles and no the valves have never been checked so if the injection cleaner doesn't do the trick I'll check them next.

Matt.


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PostPosted: Wed Jan 10, 2018 9:03 am 
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First I would check and make sure fuel is fresh (no water). Are you getting any check engine Lights ?? Have you done any work on the engine?Listen for any hissing (vacuum leaks/ line broke).Air filter is not restricted correct ?? Idle is controlled by several sensors but usually the IAC valve is first suspect.Clean and check that its working properly.I think you should hear it activate once key is turned on, but still can be dirty, or not moving..


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PostPosted: Wed Jan 10, 2018 9:35 am 
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I had this problem and it was valve adjustment. It acted the same, very difficult to start and when I did get it to started it will only run at high revs.


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PostPosted: Wed Jan 10, 2018 11:10 am 
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55,000 Miles and no valve adjustment ? .... did you mean 5,500 ?


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PostPosted: Wed Jan 10, 2018 5:12 pm 
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mattpwyman wrote:
Thanks for the reply's chaps I'll get some injector cleaner and give it. Fish - she's done 55000 miles and no the valves have never been checked so if the injection cleaner doesn't do the trick I'll check them next.

Matt.



Erm..Even I would check the valves after 55,000 miles. Has the oil been changed?

Ever?

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PostPosted: Wed Jan 10, 2018 6:09 pm 
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You say it's had a "Full Service". But no valve check or adjustment? That's not a "Full Service".

Since it's either fuel, spark, or air. I'm thinking it's a fuel related problem since it seems to have happened rather abruptly. Either contaminated or starving for it.

Your PCX is indeed in need of a valve check and adjustment if required.

On another note it could be a bad plug. . .cracked porcelain perhaps? But I'm leaning towards fuel issues.

This video is for a lawn mower spark plug but a lot of the same principles apply.

Just my 2 cents. 8)



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PostPosted: Sat Jan 13, 2018 7:33 pm 
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@mattpwyman

Can you make a video? Does the engine runs smooth on slightly higher revs on only on high revs?


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PostPosted: Sat Jan 13, 2018 10:47 pm 
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PCX150Rider wrote:
You say it's had a "Full Service". But no valve check or adjustment? That's not a "Full Service".

Since it's either fuel, spark, or air. I'm thinking it's a fuel related problem since it seems to have happened rather abruptly. Either contaminated or starving for it.

Your PCX is indeed in need of a valve check and adjustment if required.

On another note it could be a bad plug. . .cracked porcelain perhaps? But I'm leaning towards fuel issues.

This video is for a lawn mower spark plug but a lot of the same principles apply.

Just my 2 cents. 8)




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