vespasian
High Number
greater manchester
Posts: 235
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Post by vespasian on Jul 3, 2012 21:14:54 GMT
hi ,forum newbie,names daz :...........have a problem,wondered if anyone could help,ive just stripped down the engine on my px,and rebuilt it,, problem is,that when in get into 3rd or 4th gear,the engine just dies after about 10 minutes of running,,as if its run out of petrol,its not seizing,because the back wheel doesnt jam,in fact,as soon as i get it back into to neutral,its starts again straight away,ive blown out the jets,and cleaned out the carb, cleaned the cap hole,,any one got any suggestions?? oh,put a new px 150 top end on [indian] jets 102 main,,45/140 slow running,,be5 mixer Read more: vespa.proboards.com/index.cgi?board=introduce&action=display&thread=2903#ixzz1zb28CQlO |
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Post by pxguru on Jul 4, 2012 9:43:58 GMT
Sounds like maybe there is a Ray Davies in the fuel pipe?  Check your pipe it isn't too long.... |
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vespasian
High Number
greater manchester
Posts: 235
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Post by vespasian on Jul 4, 2012 13:25:17 GMT
not the exhaust mate,has suio plus on
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vespasian
High Number
greater manchester
Posts: 235
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Post by vespasian on Jul 4, 2012 13:30:55 GMT
wondering if its a gear shaft problem,as when i was rebuiling it,i turned the engine on one side,where the hub side of the gear output shaft is located,and it came out of the new hub bearing,,possibly with the weight of the engine?had to re knock it in,,if the shaft wasnt tight enough in the bearing,could that cause the problemas im having? just been out on it again,and noticed when it starts to slow down,before dieing in 4th,if i put my clutch in it keeps the engine from stalling,,one last thing is that its seems to be using a lot of fuel also
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Post by sbwnik on Jul 4, 2012 21:33:44 GMT
Rear brakes binding?
Stick it in neutral, lie it down and spin the rear wheel. It should move freely with a slight rubbing noise.
If you don't fancy lying her down, disconnect the rear brake cable and run it up and down the road, but I hasten to point out that 1) this is not a particularly clever idea, and 2) I am not condoning this idea as it is illegal....
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Post by kru251 on Jul 4, 2012 23:12:05 GMT
I use one of these. Got mine from eBay but not too difficult to fabricate. Makes checking brake drag etc a doddle. |
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vespasian
High Number
greater manchester
Posts: 235
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Post by vespasian on Jul 5, 2012 9:41:20 GMT
thanks for the input guys.i did notice binding back brake soon after rebuild,,so loosened it off ,[maybe not quite enough]i will try it with back brake detached, [just up the street and back]as have a good front disc brake,will get back with the results
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vespasian
High Number
greater manchester
Posts: 235
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Post by vespasian on Jul 5, 2012 10:52:28 GMT
not the brakes  coulld the main jet size be too big i wonder  it has a lml standard 150 top end,,main jet 102? |
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vespasian
High Number
greater manchester
Posts: 235
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Post by vespasian on Jul 5, 2012 16:40:37 GMT
not the jet,,will try the fuel line tomorrow,starting with the tank,
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Post by sbwnik on Jul 5, 2012 22:58:06 GMT
I'd guess next at something electrical struggling under load. Plug, CDI or pick up
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vespasian
High Number
greater manchester
Posts: 235
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Post by vespasian on Jul 6, 2012 8:47:51 GMT
ive changed the plug,ht coil ,cap,and cdi unit mate,no change,will also check the stator coils,if it ever stops raining  something i thought of was that,with it being a new lml top end,maybe its overheating,in regards to the piston,not quite a seizure,but a expansion that is causing a bog down in 4th? |
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bsr65
High Number
Posts: 114
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Post by bsr65 on Jul 6, 2012 9:59:26 GMT
I think indian (lml) 150 top end's have head gaskets, does yours have one fitted? what colour is your plug as it could be an air leak, Id also try your px125 main jet set up as it also sounds like your getting to much fuel through. process of elimination, the jet's/ top end/ or exhaust.
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Post by kru251 on Jul 6, 2012 12:58:56 GMT
Is this still the "happenining-after-ten-minutes-of-running" problem or now straight from the get-go? When it does this 'problem' does a shift to third mean you can get it to stay up on the revs or does it drop off here too? Reason for asking is that if the engine revs out OK in first, second and third but slows in fourth then revs fine when changed down to third it isn't carb/fuel etc. Could be a lack of compression which revs can mask but once under load allows the engine to bog down. Alternatively, if it's been got at before it could be a fourth gear issue as in overgeared perhaps?
Mate has a std PX 125 that is poor in fourth up any slope at all (so I've got him to bang it down to third to maintain revs and hence speed) but fine when on straight or downhill!!!! Keep us all informed eh? Good Luck.
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Post by sbwnik on Jul 6, 2012 17:23:09 GMT
Our lady and mistress knows someone like that....
Lucia, next time you see Cloud 9 Sue, ask her about the hill coming out of Rhyl on the A55, and why I nearly dropped my scooter laughing.
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Post by kru251 on Jul 6, 2012 20:12:52 GMT
Oh you can't leave us all out on limb with that one mate. Do tell....................................................... ;D
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Post by sbwnik on Jul 6, 2012 22:17:06 GMT
Oh, go on then....
Coming back from Rhyl in about 2003 or so, you come up a large hill on the way back to Burkined (as the locals say it). I'm on my P2, Sue's on her P125, and I think we've another 200 or T5 with us too.
We get half way up the hill and I see Sue quickly pull into a layby. I pull up behind her as she kills her engine.
"what's up?"
"It's losing power coming up the hill"
"what gear were you in?"
"Top"
"................. erm, there aren't many hills in Birkenhead, are there?"
That's all.
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Post by kru251 on Jul 6, 2012 22:20:47 GMT
Born and raised on scooter riding in Holland perhaps ha ha  |
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vespasian
High Number
greater manchester
Posts: 235
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Post by vespasian on Jul 7, 2012 21:54:06 GMT
[kru 251] its ok in all gears for the fist ten minutes or so,then i select 4th,and after a minute or so of riding,it starts to lose power,and comes to a slow stop,if i rev it,[while in gear] there is no response whatsoever to the power loss,no pick up,nothing,however if i pull in the clutch,,i get full revs again,,also,it will tick over all day in neutral,and never miss a beat,,the gearing is also correct mate,same gears from when i bought the bike new,standard 20 tooth clutch cog also,intresting story about your mate,power loss does seem to happen more on a slight hill,than on the flat with me too
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Post by sbwnik on Jul 7, 2012 22:02:50 GMT
What are your rings like? Does it fire up first or second kick?
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vespasian
High Number
greater manchester
Posts: 235
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Post by vespasian on Jul 7, 2012 22:07:49 GMT
new rings,new top end mate,not done 10 miles yet,kicks over first,and sometimes second kick
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vespasian
High Number
greater manchester
Posts: 235
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Post by vespasian on Jul 7, 2012 22:12:52 GMT
another thing,it does seem a bit on the smoky side,[blue] and at first was spitting out a bit of gearbox oil out of the cover breather,however i changed all the seals,so cant see it being clutch seal,has stopped now,and is as dry as a bone,,i didnt overfill it either,only to the threads |
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vespasian
High Number
greater manchester
Posts: 235
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Post by vespasian on Jul 7, 2012 22:37:04 GMT
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Post by sbwnik on Jul 8, 2012 8:57:34 GMT
Do you ever get that feeling that there is something at the back of your mind going "I KNOW THE ANSWER TO THIS, YOU'VE SEEN IT BEFORE"?
I'm there at the moment... It's sounds so familiar, but I can't place it.
If I was anywhere near organised then I'd start bookmarking threads so I could refer back to them. But I'm not, I just have to go by the bit of knowledge I have, the experience I've gained, and the guesses that I camoflage by sounding like I know what I'm talking about...
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Post by kru251 on Jul 8, 2012 9:46:56 GMT
Dying scooter. Vespacian. The engine may tickove all day as it's only running on its primary (idle) jet at that point. Open the throttle up and the main jet takes over and the idle jet is redundant then. Done a plug chop? This desribes it as good as I could (actually better) so try it. Might show up you have a fueling issue perhaps? www.mopedarmy.com/wiki/Plug_chop |
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vespasian
High Number
greater manchester
Posts: 235
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Post by vespasian on Jul 8, 2012 11:13:38 GMT
cheers for the input guys,appreciated kru will check out the plug in a couple of days,after i have swapped my tanks over ,as i have two pxs,so makes sense to eliminate this as a possibility first,,see you have jimmys bike in your profile:-) phil has signed quite a lot of stuff for me over the years   |
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Post by kru251 on Jul 8, 2012 16:30:58 GMT
cheers for the input guys,appreciated kru will check out the plug in a couple of days,after i have swapped my tanks over ,as i have two pxs,so makes sense to eliminate this as a possibility first,,see you have jimmys bike in your profile:-) phil has signed quite a lot of stuff for me over the years 
I have this signed copy of the full, original Quadrophenia script as well:- Dave, Spider (and me)! |
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Post by sbwnik on Jul 8, 2012 18:42:24 GMT
I've just realised I discussed your bike recently (I think...).
Is the actual reg number different to the one displayed on the front? If so, according to a traffic plod mate at any rate, you could theoretically end up in court for displaying false plates. He reckons that even though there is no legal requirement for them to be shown, if they are fitted then they should match the rear.
Just thought I'd pass that on.
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vespasian
High Number
greater manchester
Posts: 235
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Post by vespasian on Jul 8, 2012 19:24:15 GMT
awesome bike kru,a dream bike,very nice autographs too ,deffo genuine,ive collected autographs for near on 20 years |
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vespasian
High Number
greater manchester
Posts: 235
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Post by vespasian on Jul 8, 2012 19:30:42 GMT
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vespasian
High Number
greater manchester
Posts: 235
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Post by vespasian on Jul 8, 2012 19:35:41 GMT
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Check your pipe it isn't too long....
coulld the main jet size be too big i wonder 
it has a lml standard 150 top end,,main jet 102?
something i thought of was that,with it being a new lml top end,maybe its overheating,in regards to the piston,not quite a seizure,but a expansion that is causing a bog down in 4th?
