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Hooked
2020 primavera 150
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Posts: 423 Location: Lorton virginia |
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2014 lx does anyone know what the difference between .06 mm and .07 mm how it would effect the engine running? Thanks
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OP
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Hooked
2020 primavera 150
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The only reason I asked about this is because the Vespa dealer in Annapolis Md told me that they have seen quit a few lx that would not run right if set at 0.06mm .they set all of theirs at 0.07. Has anybody run into this?
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Veni, Vidi, Posti
MP3 500, GTS 250 (both 2008 MY), 2013 Piaggio BV 350, 2014 Can Am Spyder RT
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Veni, Vidi, Posti
MP3 500, GTS 250 (both 2008 MY), 2013 Piaggio BV 350, 2014 Can Am Spyder RT
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Posts: 7631 Location: Madison, Wisconsin |
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The difference is 0.004".
Perhaps the LX has a weak coil or something along those lines. In my experience changing spark plugs, it is pretty common to have more than 0.004" of wear that effectively widens the gap over spec. I don't recall having significant running issues prior to changing plugs, either. Things get smoother, sure, but it's not like I noticed it before changing plug(s). |
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
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It'll make eff-all difference if the electrical system is working as it should. You can probably go up to 2mm before any change is noticed. You don't want the gap to be too small though!
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OP
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2020 primavera 150
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Thanks for your information .I think that I will pull the plug out and set at .o028 ( 0.07) mm to see if this makes a difference as I have already replaced the coil
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OP
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Hooked
2020 primavera 150
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Posts: 423 Location: Lorton virginia |
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OP
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Well I pulled the plug and re gapped it at 0.07( originally at 0.06 ) and the difference is no hesitation. You probably know where this is going.check the plug and gap first After replacing first plug , coil , cdi. Carb , fuel tap and hoses ,replacing air filter adj valves this is running like new. I hope you get some help out of this and do not make the mistake I have made. Check plug and gap at first. thanks for all your imput
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Generally
Generally the need for a wider gaps comes from incomplete fuel-air mixing. The spark needs to occur in a region where the mixture is easily combusted. I suppose it is possible for an electronic ignition system to be touchy about it as well, if the voltage rise isn't super-fast.
I am surprised that little difference changed the engine behavior. But then, there's always something new. |
OP
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2020 primavera 150
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Posts: 423 Location: Lorton virginia |
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OP
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Thanks for the imput This was the second new carb from Scooters West. I went out again today and no hesitation.It sure is running 100 percent better ( keeping fingers crossed) I will keep you informed .the second carb I had to wait for it as I had them change something in it as I thought it was a carb problem they suggested doing ?? I don't know they even took the first one back to see if they could tell if it was a problem
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Ossessionato
2016 Vespa GTS300ie abs/asr/ess Settantesimo '70'
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Ossessionato
2016 Vespa GTS300ie abs/asr/ess Settantesimo '70'
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Posts: 3766 Location: East Anglia, UK |
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Wider or conversly a closer spark plug gap affects the ignition timing slightly making it, in effect, either advance or retard. The effect can be enough to affect the running of the motor by a little or a lot depending on what motor it is, as can be seen by the OP experience. Wider means it takes longer for the spark to build and jump while a shorter gap means the opposite. Longer gap gives weaker spark, short gap hotter more radiant spark. but even that can be variable and be opposite on some systems depending upon the ignition system type. So, all of this is dependant on what sort of ignition system is being used and even what sort of motor, it's compression etc as spark resistance increases with compression. Therefore some higher compression motors such as our scooters can be affected more by incorrect spark plug gap. Some engines are super critical on this, some don't notice it much at all. It's critical on some race engines and can mean the difference between damage to the motor or not.
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OP
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2020 primavera 150
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Posts: 423 Location: Lorton virginia |
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