PX125 Slow Running Jet Size?

[davla]

What's the size is the slow running jet on a 2008 PX125 (SI 20/20)? The Haynes manual says it's a 45/100 but I've got a 45/140 in my carb?

I've been having problems getting the bloody thing tuned. It ticks over ok from cold but, after about 10 miles, it loses all power when I pull away and I really have to rev it to stop it stalling.

[gaz_powell]

standard spec from my notes is main jet stack 140/BE5/100 and pilot (idle,slow running whatever you want to call it) is 45/140
45/140 = 3.11111
45/100 = 2.22222
the lower the number the richer the jet as you will see the 45/100 is a lot richer and could explain it.

is the bike standard ?

BUT did piaggio alter jetting when they tried to improve the omissions ? someone with a same age bike maybe able to help

put the 45/140 in and reset the air screw at 1.5 turns out and see how you go

best of luck

[davla]

Hi Gaz, thanks for the response. Everything points to the Haynes manual being wrong and the idle/slow running jet should be 45/140. After many hours (& months!) of messing around and not being able to get it to run properly, I decided to buy a new carb, fitted it this morning and it runs a treat. The old carb is dumped!

[gaz_powell]

thinking back i had this on a t5 years ago out of the blue it would start fine from cold run for about 15 minutes and then you couldn`t get it to tick over and it felt let it was over jetted - tried stator, cdi, plug leads , caps, plugs and re jetting and it turned out to be the carb - changed it over and bingo

best of luck