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Post by alanc on Jun 7, 2015 13:38:05 GMT
new stator fitted we have sparks and it fired up
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Post by henri on Jun 7, 2015 14:56:37 GMT
good news , bet ya did the "its alive" dance ,or is that just me who does that , H
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Post by alanc on Jun 7, 2015 16:12:56 GMT
up and running again new piston rings fitted compression seems better, have now discovered a new problem engine is 3 port barrel is 2 port
no dancing just yet
Alan
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Post by alanc on Jun 11, 2015 11:24:16 GMT
new 3 port barrel and piston fitted all seems fine not been out for a run yet will have to wait till the weekend for that. will let you know how it goes
alan
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Post by alanc on Jun 13, 2015 19:12:13 GMT
ok all new parts fitted scoots running if i keep tweeking the throttle she keeps running but if i let go, ticks over for about 20 seconds and cuts out, I've got the idle screw all the way in but she still cuts out idle jet is a 140/45 as far as i can see not easy to read.
any thoughts H
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Post by vespasco on Jun 13, 2015 20:27:27 GMT
You need to have the idle mix screw at the back of the carb open a little for fuel to reach the cylinder. If its a modern ish carb with fine thread on the mix screw, it needs to be unscrewed 2 1/2 turns out (anti clockwise). If its an older carb with coarser threaded idle screw try 1 1/2 turns out. If you not sure which you have try 2 turns out, i should be ok to get it running but may need a fine tweak to get the tickover relatively smooth
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Post by alanc on Jun 14, 2015 9:17:15 GMT
sorry H I think i confused you there. the mix screw is set at 2 turns out. it's the idle screw on top of the carb that's all the way in it should be reving it's nuts off but instead it cuts out, i'm thinking it needs a bigger idle jet?? as far as i can see from the interweb px 150 runs a 160/55 idle/slow running jet should i give that a go??
Alan
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Post by henri on Jun 14, 2015 10:22:33 GMT
i'm always confused ,its a way of life for me, so no harm done , if you open throttle part way will tickover screw go in a bit more ,sometimes they come up against the slide an dont raise it ,just feel tight. not sure where youve got 160/45 from , my px150 lumps running a 40/160 , started on a 45/160 but it was gutless below 1/4 throttle . but the way piaggio numbers pilot jets always confuses me ,see above comment, so maybe i'm not the best person to ask, on the lml owners club forum theres a beginers guide to scoot mechanics with a jetting/pilot jet guide ,http://lmlocgb.co.uk/phpBB3/viewtopic.php?f=5&t=1707 . this page ok , H
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Post by alanc on Jun 14, 2015 10:32:12 GMT
ok just found an old style 42 idle jet without the air breather hole on top in my old 20/15 carb gave that a go and it's ticking over like a trooper.... happy days suns coming out so should get her out for test drive later
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Post by henri on Jun 14, 2015 10:36:11 GMT
yippee , am doing the "its alive" dance for ya as i type , damm hard to reach keyboard as ya moonwalk by the way, H
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Post by alanc on Jun 14, 2015 10:48:37 GMT
cheer Henri am dancing too lets hope the test drive goes to plan now
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Post by alanc on Jun 14, 2015 14:32:46 GMT
hi henri had scoot out for a run not good couldn't get her over 55kph timing is 20btdc, main jet 160/be3/100 idle jet 42
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Post by henri on Jun 14, 2015 16:27:35 GMT
55 klicks ,sorry my brain only works in old money , bout 30mph , is it "bogging " ,as in just not accelerating to the throttle , an where in throttle position will it run too , i'd of thought a 100 or maybe a 102 main should be right ,but maybe a 96-98 is more right, an a be5 atomiser ,if memorys workin a sprint with later 3 port barrels timed to 22 btdc , with modern fuel i usually retard 2 degrees ,but if you had no sign of pinking maybe try advancing to 22 deg's ,an then try a be5 an do some plug chops ,at 30mph dont think your onto the main jet unless in 2nd so am reckoning its the atomiser needs fettling, H
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Post by alanc on Jun 14, 2015 17:35:08 GMT
yeah bout 30 mph mate, it just feels gutless through all the gears, will try be5 atomiser and playing with the timing, funny thing is it seems to run better at 32btdc??? more tinkering required me thinks
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Post by vespasco on Jun 14, 2015 22:23:13 GMT
First check if your idle jet needs an air corrector in the idle or is the air supply controlld by the carb? Theyll be a hole next to the idle jet. If its a new carb it would likely need an idle jet with the air corrector hole in it.
Jet your 20/20 carb how you had it earlier, when it ticked over and ran fine but try a larger main jet, like a 105, or even larger.
And your timing ... Try @ 21° / 20° Then more advanced your timing the better it will likely feel...but too far and it wil probably start pinking.
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Post by alanc on Jun 15, 2015 8:16:57 GMT
its the old style carb with an air breather hole next to the main jet
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Post by alanc on Jun 15, 2015 20:41:50 GMT
I've read on other posts that I should plug that hole what do you say H
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Post by henri on Jun 16, 2015 7:53:31 GMT
where did you read that , if youve still got the 42 pilot in without air correcter an you block the hole it wont work , but as you had newer jets with correcter holes in that hole is prob why the jetting was out , i think , will have to re-read whole thread as i'm gettin confused on where we are . H
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Post by alanc on Jun 16, 2015 15:49:50 GMT
have checked the plug and it's black as coal so definitely running to rich
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Post by vespasco on Jun 16, 2015 16:33:29 GMT
If you have the hole in carb then the 42 idle should work, maybe even a 45. You can plug then hole with lead shot and then use the idle jet with air corrector built in. This is a piaggio/dellorto upgrade on later carbs. It gives you finer tuning capabilities. To make sure were looking at the same thing....this is where the hole/plugged hole is. Start with setting up the idle. Get it warm and adjust as necessary. Theres a few threads on here that have details on how to set the idle correctly At what throttle range did you cut the ignition when you checked your plug? I read that to start with, it was idling and running ok but not at wot..as it was too lean (maybe even too rich??) Personally id start with stock jetting for your carb. If its a 20/20 then try the jets for early p150 (pre emissions) If it still runs erratically despite your best efforts then id concentrate on the ignition side of things
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Post by alanc on Jun 24, 2015 23:19:25 GMT
hi guys not had much chance to get working on the scoot as life has been getting in the way, however I did get her ticking over with the original idle jet (140/45) but I have to keep the choke on, as soon as i cut the choke the scoot runs for about 30 seconds then cuts out.
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Post by henri on Jun 25, 2015 7:38:55 GMT
runnin to lean ,or blocked pilot jet , scoots runnin on the choke an build up of petrol mix in cases , soon as this goes ,30 seconds ,they die , H
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Post by alanc on Jul 11, 2015 14:25:25 GMT
ok had another wee look at the scoot, it's ticking over and reving sweet with the choke on, when i cut the choke it still ticks over but as soon as i try to give it some throttle it cuts out ? mixture ??
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Post by pompeydave on Jul 13, 2015 0:01:27 GMT
Hi Guys, sorry to but in here, but I've got exactly the same problem on my 2003 PX125 Disc. AOK up until about an indicated 50 mph, then it coughs and splutters and kangaroos down the road until I back off the throttle. It's fine in 1st and 2nd, splutter a bit at high revs in third, and is terrible above 50 in top. I've changed the CDI, HT lead, HT cap and plug, and today changed the LT coil on the stator, all to no avail. I've tried standard jets, uprated flavour jets, but no difference. I'm starting to think this is fuel starvation- Alan, have you looked at the fuel flow from your tank?
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Post by vespasco on Jul 13, 2015 15:22:48 GMT
both sound like a blocked jet to me....so yes it could be fuel startvation.....or at least thats the thing id look at first alanc sounds like the idle jet is blocked!? pompey dave sounds like the main is blocked!?
and you may both benefit from removing the carb and giving it a good clean and blow out
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Post by alanc on Jul 15, 2015 20:33:06 GMT
ok cleaned the idle jet with carb cleaner no difference. still starts and ticks over with the choke on but cuts out almost as soon as i cut the choke, have tried adjusting the mixture 1/4 turn at a time from 3 turns out to all the way in still no difference exact same result, it's like the mixture screw isn't making any difference.
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Post by alanc on Sept 24, 2015 7:44:09 GMT
hi guys not had much time to get at the scoot lately so here's the latest. sprint veloce 150 standard, electronic timing set to 19btdc, carb serviced new gaskets and needle, jets 140/45 idle, 160 be3 102 main, and i've aquired a scorpion power pipe. problem still exists, starts ticks over sounds great while ticking over and reving good, soon as i ride the scoot it's sluggish and wont go above 60kph/35mph, I think it's a jetting / mixture issue any suggestions guys???
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Post by vespasco on Sept 24, 2015 15:37:21 GMT
Now im confused! Earlier you mentioned you have the air corrector hole in the carb. If you still have this you should be using the idle jet without the hole, like the 42
My Haynes manual says for a Sprint, the jetting is: Si20/17D 100 main jet 42 idle E1 atomizer (or try a BE1 if its easier to find) With a 140 air corrector on the main stack.
And a number 0 slide
Ignition at 22° But i guess you know all that already.
With the new pipe you have you'd need to upjet the main a couple of points from whatever ran well with the stock pipe.
If you have the 20/20D: Around 100 main jet (with stock pipe) 48 idle (without hole in top) Or a 48/160 if you have the hole in the carb Slide no.1 BE3 mixer
Personally, id get it set up totally stock, with stock pipe, stock jetting as above.
Then when youre happy it idles and runs ok, change to your new pipe and upjet the main
If it now idles fine, without the chokethen ypu must be close. At idle, when you 'blip' the throttle quickly, the motor should come back down to idle pretty quick, within 2 or 3 seconds. If it hesitates or takes longer to settle down to idle then you need to richen up the idle circuit, either by turning the idle mix screw out 1/2 turn or so, or by using a richer idle jet. (The 2 digit number of the idle jet needs to be larger, eg a 45/160 is richer than a 42/160. The '42' (the answer to everything) does the same as the main jet. The 3 digit number on the idle jet is the air corrector, just the same as the air corrector on the main jet stack. So a 42/160 would be leaner than a 42/140, as it lets more air into mix, making it leaner.
You really should be able to notice the difference between the idle mix screw fully in and 3 turns out. As you wind the mix screw in, the motor will reach a point where it starts to rev faster, because its effectively being starved of fuel.
If there really is no difference to the revs, despite the mix screw being fully in or out then You either have the wrong mix screw in or a way too large idle.....or another problem elsewhere!
Which would lead me to the ignition Maybe its the bajaj stator you are using thats not quite compatiable with the rest of your piaggio motor???
And i still there could be room for improvement with the ignition timing Again, i would start at stock settings, 22° and work my way down if needed.
Remember, when you set the timing with your strobe you need to have the motor revving a little, over 2000rpm, not just ticking over. Otherwise, youll likely be a couple of degrees further retarded, giving you your symptoms!?!?
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Post by alanc on Sept 24, 2015 20:40:36 GMT
cheers ace a lot of usefull info there will have another tinker at the weekend and let you know how things go
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Post by alanc on Dec 6, 2015 16:51:05 GMT
thanks for all the info guys, the latest on the scoot is that I had to give up on the engine and take it out of the scoot inorder to get her painted before winter crept in, she is now painted and rebuilt just waiting on the engine coming back, a friend is splitting it and putting in new crankshaft, bearings, seals etc, so will be like a new engine when i get it back.
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