garryb
2nd Class Ticket
Posts: 25 
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Post by garryb on Jan 6, 2017 11:07:32 GMT
I bought a Vespa px125 1986 around 6 weeks ago - I've not really had a chance to take it a good wee run till last week - was out for just over an hour when it just bogged out on me , wouldn't start again - plenty fuel in tank - to cut long story short the scooter runs 20 20 carb with the jets - main jet 105 - mixer be4 - air 140 / spark plug BPR 7ES - when I took plug out that day it was black oily - I put a new plug in and started no probs - ran about for half an hour and it started coughing and spluttering - I've now put the plug BR7HS in it - took it a wee spin last night just round block couple times, I cut engine off checked plug and it's still black but more like black suit than black oily - WHAT DOES ANYONE ADVISE I DO OR TRY NOW ? I can't tell if it's tuned or not - I'm new to vespa's and I have no history with it at all ! 👎
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Post by bignico2411 on Jan 6, 2017 14:29:12 GMT
Garry, I'm sure I read somewhere that a malfunctioning choke can make a plug sooty. Might be worth checking that it opens/closes properly
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Post by phattanglo on Jan 6, 2017 19:04:05 GMT
A 105 mj seems a little big if its a std 125.
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Post by bignico2411 on Jan 6, 2017 20:06:23 GMT
A 105 mj seems a little big if its a std 125. His air filter is drilled out, so mightn't be too big, maybe one size. |
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garryb
2nd Class Ticket
Posts: 25
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Post by garryb on Jan 6, 2017 22:00:34 GMT
A 105 mj seems a little big if its a std 125. His air filter is drilled out, so mightn't be too big, maybe one size. air filter has one hole drilled out in the heart shape - am I better going bk to standard jet settings and getting a new standard air filter ? |
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Post by pxguru on Jan 7, 2017 5:59:40 GMT
Surprised no body mentioned that your spark plug BPR7ES is totally wrong (thread length, heat rating and resistor) for a 1986 PX125. Should be a B6HS.
If it is totally standard the 105 main jet is too big and that is your problem. If it were tuned or had a 180 kit on it then the 105 would not run black and oily. So if it is tuned it is nothing so much to get excited about but this is always the best place to start with an unknown scooter.
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Post by bignico2411 on Jan 7, 2017 10:27:56 GMT
Surprised no body mentioned that your spark plug BPR7ES is totally wrong (thread length, heat rating and resistor) for a 1986 PX125. Should be a B6HS. If it is totally standard the 105 main jet is too big and that is your problem. If it were tuned or had a 180 kit on it then the 105 would not run black and oily. So if it is tuned it is nothing so much to get excited about but this is always the best place to start with an unknown scooter. Henri put him right on plug on a previous thread, guru, though he recommended a 7HS rather than a 6. Lad has no history with the scoot, so doesn't know if it's been tuned or not. I agree that a smaller mj should be his next step, I think it was you advised me adjust/change one thing at a time! |
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garryb
2nd Class Ticket
Posts: 25
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Post by garryb on Jan 7, 2017 11:17:36 GMT
Surprised no body mentioned that your spark plug BPR7ES is totally wrong (thread length, heat rating and resistor) for a 1986 PX125. Should be a B6HS. If it is totally standard the 105 main jet is too big and that is your problem. If it were tuned or had a 180 kit on it then the 105 would not run black and oily. So if it is tuned it is nothing so much to get excited about but this is always the best place to start with an unknown scooter. Henri put him right on plug on a previous thread, guru, though he recommended a 7HS rather than a 6. Lad has no history with the scoot, so doesn't know if it's been tuned or not. I agree that a smaller mj should be his next step, I think it was you advised me adjust/change one thing at a time! thanks guys really appreciate this - so should I now get B6 plug ? I got the one Henri advised the other day - I've ordered new jets pick them up beginning of week hopefully - will I just change the main jet to start with ? Or will I change the whole lot and pilot aswell ? Sorry guys am pretty clueless 👎 |
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Post by ironsloth on Jan 7, 2017 12:51:30 GMT
What about uploading a picture of the engine? Unless it's a ported 125, or a 150, someone on here should see straight away whether it's kitted or not. I mean most of us should be able to spot it, for all we know, it could be a Malossi. Just s thought.
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Post by henri on Jan 7, 2017 16:41:58 GMT
he's emailing me some piccys , wont be able to upload them tho as photo(sick)buckets spat the dummy on me . seems you only get so long free before they make it hard to use ,have heard of another hosting site ,image.com, or something like that .but as it took intensive coaching by sime,3 days,an 4 tantrums to get me "bucketing" dont hold ya breaths lads i might be some time.
H
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Post by pxguru on Jan 8, 2017 3:18:51 GMT
They chose the name well when they called it "bucket"  Now you have a B7HS that will be fine. A B6HS is better for a standard 125 scooter though. Many new scooterists think that putting in a higher number plug will make it go faster, in fact the opposite is true. The plug should be the lowest number that doesn't quite overheat and this can be seen from the burn signature on the electrode arm. For a mostly motorway use a higher numbered plug usually works out better. The heat number of the plug only affects the plug itself and won't damage the engine. By affecting the plug I mean it will either foul up with soot and stop running or overheat and crack and stop running. If your scooter runs for 1000's of miles without needing a new plug you are at least in the zone of correct. If your engine is tuned it would not run black and oily on a 105 main jet, so it isn't tuned but the previous owner thought it was. |
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