vespa px woes

[joeswoonara]

I have a Px that is in danger of going to a watery grave ............it rides great for about 5miles then stops ! If i leave ot a couple of minutes it starts 1st kick then its o.k for another few miles and then stops again .........stator i thought so changed that ......and the c.d.i plug and plug .....the tanks been cleaned .....so now spotless .........carb is ok and jet blown out...........i'm now stumped.......please help save this px from the local cuto

[cit205]

Petrol cap breather blocked or something like waterproofs stashed under seat blocking it or the air intake

Take the cap off and ride down the road ,if the tank's not full ,that will eliminate if it is the cap if you havent got access to a compressor or something to blow it through .

Could still be a faulty LT coil on the stator ,just because it's new doesn't mean it's not faulty, same with CDI, or your switch, try pulling the green wire from the right hand terminal on the CDI to bypass the switch to eliminate that. Obviously you'll have to stall it to turn it off while you do that test.

[joeswoonara]

Thanks for the reply ......no waterproofs in the way,forgot to put pettol cap breather as been drilled out larger will try the green wire tonight ..........the stator was change again for a know working pne off a running scppt and it still stopped

[rapido230]

float needle sticking? or worn? maybe too long a fuel pipe or kinked?

[joeswoonara]

I have swapped carb with like for like with a mates ......still konked out .......fuel hose is the BGM type with internal spring so should'nt kink.............looks like the canal for this baby a

[rapido230]

isnt the bgm hose slightly smaller internal diameter? i could be wrong tho and i'll be corrected on here lol. what about length of pipe ? sometimes if too long it can cause probs. dont throw in canal, throw it my way lol

[LI150]

I cant answer your problem but from what you are describing it sounds like its a problem once your scoot is warmed up. Seeing as it runs ok then when warm problem occurs I would say it is not a fuel prob. Just a thought are you sure its not heat seizing

[cit205]

That's what made me think cdi or LT coil..

Wonder if there's a hairline crack somewhere in the casing where it counts ,that opens up when it gets to temperature, just a thought

[mongoose]

You have changed the plug, but did you change for the same. I would go a couple cooler if you can. See if it runs for longer, to me it sounds like the coil is breaking down. Also when you go out next, drive really conservatively, keep revs low and see if that improves distance, i had a car once which would go all day long unless i went over 55 and the same thing happened, few minutes later it would all start fine. That was the coil but never bothered to change it.

[joeswoonara]

hi lads ....thanks for the replies and i can see what your all saying ,but thats the thing that has got me so baffled ........the c.d.i is a new one so to is the stator plug lead, plug cap and even the carb although not new was taken off a mates running scooter ,all the parts you have mentioned have been changed for new after it started conking out