Autolube to non autolube

[psgnw]

I have just gotten a PX125E from 1987. It was kind of messed up by the previous owner. He had put a Polini 177 cylinder, a Polini Venturi, a SIP Road 2.0 and a 24/24 non autolube carb on it. The 177 seized and he put back the stock 125 cylinder, but left everything else from the tuning kit on. I have put a 20/20 non autolube carb on it (with original airfilter). Main stack in the carb now is : 105 E5 140 and a 45/140 idle jet. 

The previous owner half disabled the autolube. By that I mean that there is missing pieces from the oil pump (the gear that goes down to the clutchside and the gear cog in the carb housing). I have put non autolube gasket on the carb, pulled the oiltank and blocked the oil line pipe with sealingmass/screw. Is there anything else I should do to have it running smooth as a premixed scooter (which  I prefer and is used to)?

[adrian]

Is the hole the autolube gear runs through blocked up ? air tight? You can get a special/proper blanking grommet for this, and doesn't cost much , or just fill it with whatever you want

[psgnw]

I'll have to check. If not I will clean it up with brake cleaner and block it with rtv silicone.

[adrian]

Also fill in the oil groves inside the carb box, to make certain that you have no air leaks

[psgnw]

What idle jet should i go for on a standard 125cc cylinder with the SIP Road 2? I have a 45/140 in the carb now. I have a 45/120 and 45/160 + a box of 58-68/160 jets. Would the 45/140 be ok, or is it better to go richer?

[adrian]

All I can say is try it and see what the plug is telling you, probably wouldn't hurt to go a little richer, but I am no expert, and get my carb set up by someone who knows what is what and a dyno. Shore someone will be able to give you a better answer

[phattanglo]

If you go on a dealer website they often have a database of carb settings. I use Wasp performance as they list the carb settings for individual models and my 2012 PX125 runs fine.
I did the conversion from pump to premix and it was very straight forward. What you've done already is pretty much it.
The main difference for me is the 2012 125 is a catalysed engine as standard so when I dumped the exhaust and fitted a Sip road 2 I just had to make a couple of extra tweaks.
Your pilot jet, air corrector etc will probably be ok whereas I had to fit a richer pilot jet and throttle slide as it was running very lean.
It's personal preference but I like to have the jetting in the lower rev range a bit rich as I've had a few soft seizes coming off full throttle and research suggests this is caused by the lower rev range being too lean rather than the wrong main jet.
From what I've read the lower rev jetting will affect what your final main jet will be but it just helps protect your engine especially if you like to thrash it.

[psgnw]

Thanks! I put the 45/120 idle in. I also have changed the slide for a 02 slide (without the compartments). I'm thinking going from 140 to 120 AC.

How do I make sure it runs richer in low rev range? I come from the smallframe world and carbs are much simpler and much harder to set up there

[phattanglo]

Usually a low rev mixture which is slightly rich or absolutely spot on will give nice quick rise in revs when the throttle is blipped and quickly drop back down to a steady tickover.
A lean mixture is likely to take longer to drop back down to a tickover and may give you more of the classic 2 stroke ting ting exhaust sound.
There's plenty of info on Youtube that demonstrate this and a chap called mista freak moped posts lots of useful videos on there.

He does some good stuff on O tuning if you fancy squeezing a bit more power out of the standard Vespa engine without going down the barrel kit route.