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Post by jid1973 on Dec 8, 2013 12:31:16 GMT
Hello all I have a PX125. It's been upgraded a little with a Polini 177 kit, Somonini exhaust and SI 24/24 carb. Struggling to get it over 55mph and a bit lumpy on idle and low revs. Can anybody advise the correct jetting. I think the current main is a 108. I have taken the plug out to check colouring and attached a pic to this post. Attachments:
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Post by jid1973 on Dec 8, 2013 12:45:00 GMT
When I say I'm struggling to get 55mph. I mean it will seize
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Post by rab on Dec 8, 2013 13:25:01 GMT
mine has a px 200 carb on the 166 molosi kit rather than messing with re jetting and adjustments id say get a 200 carb on it and just adjust mixtures until its running smooth also check your timing
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Post by sbwnik on Dec 8, 2013 18:02:21 GMT
What jets? You should be running something close to standard p2 jetting.
Check the stator is retarded as far as it will go too.
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Post by jid1973 on Dec 9, 2013 19:32:02 GMT
Would the wrong jetting cause my scoot to seize at 55mph?
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Post by sbwnik on Dec 9, 2013 20:50:05 GMT
Yes, not enough fuel getting through, but I'd check the timing while I was at it.
Thinking back to the timing on my old shed, I opened the slots out a touch so I could take it further back.
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Post by jid1973 on Dec 9, 2013 21:50:02 GMT
I thought to much fuel would cause that ie to much fuel causing heat.
But then I am a novice to the scoot world
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Post by jid1973 on Dec 9, 2013 21:51:08 GMT
So you recommend
1- get the jetting checked
2-get timing checked/adjusted.
Would any bike garage be able to do this
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Post by sbwnik on Dec 10, 2013 7:16:04 GMT
Fuel causes oxygen to burn - it's an accelerant, not the actual source of power - and evaporates. Anything that evaporates cools as it does so, so it helps avoid seizure and piston melting incidents.
Unfortunately, if you have too much fuel - too big a jet - then there won't be enough oxygen in the mix to fire cleanly, so it'll either not fire, or bog down if it does.
Despite scare stories, there is generally a fairly wide range where the motor will run happily.. But a bit of time on a scooter shop done is the only way to get it bang on.
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Post by jid1973 on Dec 10, 2013 7:58:07 GMT
Thanks for the help. Really do appreciate it. I will get it booked in. Do you think I should be able to get more than 55 out of it?
Cheers
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Post by rab on Dec 10, 2013 21:47:18 GMT
without a doubt yes id just be careful get it tuned to go faster but not as fast as it will go you can spend a few hundred quid making it faster using kits but for the same few hundred quid you could simply put a bigger engine in it that goes faster and is supposed to. call me cautious but who likes sitting at the side of the road with a blown engine and money down the drain follow nicks advice take it to a scooter shop that specialize in scooter tuning pay good money now or bad money later when your the one sat on the kerb
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