p lax
I still need to post more on here!!!
Registered: 07-2008
Location: selsey costa del sussex
Posts: 197
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Re: Mechanical help thread!
you find nearly all scooters,not just lammies suffer from this type of thing,i have to re fix most of the wiring in the headset about once a year,bad road surfaces down here play havoc with an old scoot,glad to be some help
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8/Sep/09, 7:01 pm
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nevergrowold
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Registered: 02-2009
Posts: 25
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Re: Mechanical help thread!
hi there can anyone please help me ..i have a vespa px125..the problem is when i take her out on a longish trip after about 20 miles or so she justs cuts out for no apparent reason i then start her up again and away she goes ...i did about 60 miles this sunday and she cut out 4 times as anybody got any ideas what the problem could be would be greatful for any help
cheers scott
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if you ever had a clue
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26/Oct/09, 9:01 am
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p lax
I still need to post more on here!!!
Registered: 07-2008
Location: selsey costa del sussex
Posts: 197
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Re: Mechanical help thread!
this could possibly be one of maybe 4 things,luckily all easily fixed.
no1,is petrol getting to the carb in sufficient quantity? i.e.is the petrol flowing,take off the petrol pipe,hold over a container and open the fuel tap,no smoking!,if this is ok go to no2.
is the fuel filter bloccked? this is located where fuel pipe connects to carburator,remove filter, clean and reinstate,no3,is the air filter blocked or dirty? dont bother cleaning it replace,but first you could try running for a few miles without filter to see if this is infact the problem,no4 and posssibly the most serious,is enough 2 stroke being mixed with the petrol?if not you could be suffering minor heat seizures,dont ignore,best method is to put approx 3-4% of two stroke oil(best quality you can afford)directly into fuel tank when you fill up,dont trust any autolube system,you could even go upto a 5%mix without damaging scoot,buy a little jug available at any good scooter shop.try allstyles.
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27/Oct/09, 5:55 pm
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nevergrowold
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Registered: 02-2009
Posts: 25
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Re: Mechanical help thread!
cheers p lax mate i will have a look at all that see how i get on thanks again for your help much appreciated cheers scott
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29/Oct/09, 8:53 am
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Guy160
I still need to post more on here!!!
Registered: 04-2008
Posts: 103
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Re: Mechanical help thread!
quote:
p lax wrote:
this could possibly be one of maybe 4 things,luckily all easily fixed.
no1,is petrol getting to the carb in sufficient quantity? i.e.is the petrol flowing,take off the petrol pipe,hold over a container and open the fuel tap,no smoking!,if this is ok go to no2.
is the fuel filter bloccked? this is located where fuel pipe connects to carburator,remove filter, clean and reinstate,no3,is the air filter blocked or dirty? dont bother cleaning it replace,but first you could try running for a few miles without filter to see if this is infact the problem,no4 and posssibly the most serious,is enough 2 stroke being mixed with the petrol?if not you could be suffering minor heat seizures,dont ignore,best method is to put approx 3-4% of two stroke oil(best quality you can afford)directly into fuel tank when you fill up,dont trust any autolube system,you could even go upto a 5%mix without damaging scoot,buy a little jug available at any good scooter shop.try allstyles.
I know this is months old..but adding comments because its a sticky and people may still use this thread for reference.
Some of the advice contained in this post, while doubtless well meant, is really not very good at all.
Its a PX. It needs 2%. No More! Running 4-5% oil in a PX motor will acheive 2 things...ludicrous unecessary expense is the first, the other will be weakening the fuel-air ratio slightly,and increasing carbon deposits. Don't do it.
Also...the very best 2 stroke for a P range really is overkill, its not necessary and is a big waste of cash. A Decent 100% synthetic is the very most you need, but it'll run fine on even basic mineral oil...thats what it was designed to use!
As for 'don't trust any autolube systems'...this is just plain silly. In almost 28 years of scootering,and countless hundreds 0f bikes worked on, both my own and professionally, I have only seen 3 failures of the PX autolube system EVER...and one of those was on a 2nd hand motor of indeterminate age,bought for pennies out of a scrap scoot,so ignoring that one, 2 failures on decent newish well maintained scoots. 1 T5 and 1 P2, both still under warranty.
Buy a new air filter if dirty? No.Clean it. As recommended by Piaggio.
Test to see if the filter's blocked by running without it? NO! Without the filter the engine will be running weak, and will soon damage the piston unless upjetted to suit.
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23/Feb/10, 7:31 pm
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nevergrowold
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Registered: 02-2009
Posts: 25
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Re: Mechanical help thread!
hi its me again..... this time i have a lambretta Gp150 with imola 186 kit fitted... was riding home this afternoon just done about 30 mile when something went pop engine died when tried to kick her off no compression any ideas
cheers
scott
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if you ever had a clue
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10/Apr/11, 6:41 pm
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mickee
I can't possibly have a job, as I'm always on here!!
Registered: 12-2003
Location: Carshalton Surrey
Posts: 7402
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Re: Mechanical help thread!
quote:
nevergrowold wrote:
hi its me again..... this time i have a lambretta Gp150 with imola 186 kit fitted... was riding home this afternoon just done about 30 mile when something went pop engine died when tried to kick her off no compression any ideas
cheers
scott
I would say at a guess you've blown a hole in the top of the piston mate....usually caused by caning it when it's not jetted properly or you haven't got a fast flow fuel tap/pump fitted or there's a fuel blockage of some sort.If not that then you've broken a piston ring ..all guess work of course,just take the cylinder head off and have a look. 
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10/Apr/11, 8:08 pm
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nevergrowold
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Registered: 02-2009
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Re: Mechanical help thread!
cheers mate your dead right holed the piston ;-(
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11/Apr/11, 8:16 pm
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mickee
I can't possibly have a job, as I'm always on here!!
Registered: 12-2003
Location: Carshalton Surrey
Posts: 7402
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Re: Mechanical help thread!
quote:
nevergrowold wrote:
cheers mate your dead right holed the piston ;-(
You're not the first,it's quite a common thing with tuned motors and keen riders! ..If it's not too bad you may be able to repair the piston rather than replacing it,depends how much a new one costs really? A friend of mine holed a pist when he was half to one of the West country rallies...he dug around in his tool box and found a little screw that filled the hole and srewed in tightly.He said he made it there and back ok so just left it in there! 
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12/Apr/11, 6:40 pm
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nevergrowold
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Registered: 02-2009
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Re: Mechanical help thread!
dam expensive pistons for it i have been told i am runiing weak so need to set carb up dont know where to start 
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14/Apr/11, 7:57 pm
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