Piaggio Zip 70

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DomX2006
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Piaggio Zip 70

Postby DomX2006 » Wed Nov 08, 2006 8:56 pm

I was wondering if someone had ideas on this:

Everytime i go down the road at 60mph for about 4-8mins i start to hear this hissing noise and so i let off the throttle and that seems to stop it but when i put more throttle on it starts at a lower speed say 55mph?, twice when going down this road at this speed it has cut out on me, i dont know whether its overheating or what but it scares the hell out of me going when it craps up with cars flying by lol.

Anyways wondered if it was a common problem with 70's or something,

Id appreciate some advice on this.

Thanks

Dom
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DTO
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Postby DTO » Wed Nov 08, 2006 9:34 pm

your freeflow air filter sucking in air :bang
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Postby DomX2006 » Thu Nov 09, 2006 1:20 pm

erm... i dont think it is becos it only does it when im going fast e.g 55-65 i have a malossi type air filter.
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Postby DomX2006 » Thu Nov 09, 2006 6:02 pm

How do you explain the cutting out then?
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Postby dac69er » Thu Nov 09, 2006 6:54 pm

have you checked your plug? if you are running too lean or rich it can make the bike cut out.

sounds rather like you are running to lean and sucking in too much air if you ask me.
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Postby DomX2006 » Thu Nov 09, 2006 7:05 pm

i checked the plug a couple of weeks ago and it looked fine.

Thanks for your help though

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Postby ds55 » Thu Nov 09, 2006 7:28 pm

Don't hold me to this at all, but might it be overheating? Is liquid cooled or air?
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Postby DTO » Thu Nov 09, 2006 7:32 pm

trouble with freeflow type airfilter is they suck in loads of cold air , the standard filter take's it's air from tube behind panel so should be warm-ish.

you might get carb iceing as im not sure your bike has carb heater ?
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Postby dac69er » Thu Nov 09, 2006 7:34 pm

my air cooled zip is heated via the engine. has a little tube going to it with a rubbery cover to keep the heat in. xcould be carb icing if that bit hast been put back on the scoot when the 70 kit was fitted.
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Postby wobbly-51 » Thu Nov 09, 2006 7:35 pm

dac69er wrote:have you checked your plug? if you are running too lean or rich it can make the bike cut out.

sounds rather like you are running to lean and sucking in too much air if you ask me.


would have to be extremely lean to do this, 2 strokes actaully produce more power if run very slightly leaner than usual, however they do start to burn pretty little holes in the top of the piston(s).

it could be muck in the carb (you are using an open style filter which isn't as effective at keeping crap out of the engine as a stock filter).

could also be heat or cold seizing, if it does this when you first set off its probably due to the bike not being warm before thrashed, if you run flat-out for any length of time the piston will become too hot and expand enough to nip the barrel (heat seize).

Most likely a carburation issue, i would go to stock airbox for the winter (personally i would stick to it all year round in the UK)

overheating is a possibilty, also check for air leaks around the reedblock, makes bikes run very lean.
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DomX2006
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Postby DomX2006 » Thu Nov 09, 2006 7:44 pm

Thanks for all that i will check the plug again just to make sure, going back to the plastic on the cylinder i do have the tube missing that lets the hot air escape it came off sometime last month as it happens so would that tube not being there have a GREAT effect on its possible overheating?

Thanks

Dom
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Postby DomX2006 » Fri Nov 10, 2006 2:43 pm

Ok, ive just realised does that tube from the plastic covering the cylinder give heat to the carb to prevent icing? And also that prevents the engine getting too hot becos the heat goes else where?

Dom
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Postby dac69er » Fri Nov 10, 2006 5:22 pm

it prevents the carb icing up. so you my be having trouble with that.
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Re: Piaggio Zip 70

Postby Grant247 » Tue Aug 11, 2015 2:54 pm

Does any one no what the problem is as my piaggio zip is having the same problem?
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DTO
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Re: Piaggio Zip 70

Postby DTO » Tue Aug 11, 2015 7:35 pm

It would be nice if new members could introduce them self first , there is a thread for this :idea:
Also posted in a dead thread that's over 9 years old :umm:

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