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PX125
Aug 17, 2013 12:58:54 GMT
Post by burnleymez on Aug 17, 2013 12:58:54 GMT
having just bought a PX125 (been out of the scene for 10 years) it seems to struggle to get the revs up to move off, when the revs are up its fine,it just seems to lag..it is standard with a simonini pipe. should the carb be upjetted??? any suggestions  |
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PX125
Aug 17, 2013 13:15:45 GMT
Post by fredperrybruce on Aug 17, 2013 13:15:45 GMT
Check your main jet, running with a stock standard exhaust it should be a 96 main.
When I ran my 125 with a simmonni I ran with a 102 main jet no problem.
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PX125
Aug 17, 2013 13:27:08 GMT
Post by burnleymez on Aug 17, 2013 13:27:08 GMT
it is a 96..ill invest in a 102..many thanks
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PX125
Aug 17, 2013 14:38:13 GMT
Post by fredperrybruce on Aug 17, 2013 14:38:13 GMT
If your going to change your jetting which I would strongly advise , maybe try a 100 then work your way up.
If you buy a simonini from ebay they come with a 102, I also ran with a 102 and had no problems. Have a play and good luck
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PX125
Aug 17, 2013 17:29:22 GMT
Post by burnleymez on Aug 17, 2013 17:29:22 GMT
what about the idle jet?? it currently has a 45/140..
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PX125
Aug 17, 2013 17:47:51 GMT
Post by fredperrybruce on Aug 17, 2013 17:47:51 GMT
Leave the idle jet, one thing at a time.
Sort the main jet out and you shouldn't have to touch the idle. Make sure once you've changed main jet you take for a spin and check the spark plug colour.
What does the plug look like now??? I would imagine it looks a little lean (whitish in colour)
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PX125
Aug 18, 2013 5:37:43 GMT
Post by sbwnik on Aug 18, 2013 5:37:43 GMT
It's a Simo. It's going to bog slightly anyway.
But you need to upjet
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PX125
Aug 18, 2013 9:03:59 GMT
Post by burnleymez on Aug 18, 2013 9:03:59 GMT
:-Sbut it struggles to start. you have to get going then keep the throttle wide open until the revs picks up, but still bogs when trying to set off until you get the revs up.
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PX125
Aug 18, 2013 14:02:11 GMT
via mobile
Post by sbwnik on Aug 18, 2013 14:02:11 GMT
Sounds right. It's why everyone - including Scootering - recommend the SIP Road, the power is lower down
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vespasian
High Number
greater manchester
Posts: 235
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PX125
Aug 19, 2013 9:42:13 GMT
Post by vespasian on Aug 19, 2013 9:42:13 GMT
98 jet
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bsr65
High Number
Posts: 114
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PX125
Aug 19, 2013 15:05:38 GMT
Post by bsr65 on Aug 19, 2013 15:05:38 GMT
sound's like a flat spot when opening the throttle, I usually find it's either the air mixture not set correctly or the slow running jet blocked at the tip
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PX125
Aug 19, 2013 15:27:44 GMT
Post by burnleymez on Aug 19, 2013 15:27:44 GMT
sound's like a flat spot when opening the throttle, I usually find it's either the air mixture not set correctly or the slow running jet blocked at the tip its a brand new main jet. so maybe mixture screw. its out about one and a quarter turns |
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vespasian
High Number
greater manchester
Posts: 235
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PX125
Aug 22, 2013 12:35:25 GMT
Post by vespasian on Aug 22, 2013 12:35:25 GMT
1 and a half turns works for me with a 98 jet,be careful not to over screw the jets in...otherwise it will never run right again,,the current spaco carbs are garbage,
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