Search found 302 matches

by paul d
Sun Dec 20, 2020 12:52 am
Forum: Vespa Tech
Topic: PX 125 Bogging down problem
Replies: 17
Views: 1691

Re: PX 125 Bogging down problem

Correct way is to follow everything I've said previously which will solve the cause. If you've no time just put in a bigger main jet. Go up one or two from whatever number is fitted already. If you don't have a bigger jet, run the bike with a dash of choke all the time. A small bit, don't push the c...
by paul d
Thu Dec 03, 2020 9:19 pm
Forum: Vespa Tech
Topic: PX 125 Bogging down problem
Replies: 17
Views: 1691

Re: PX 125 Bogging down problem

First thing I'd do is check the main jet. Carb lid off, air filter off, it's under the biggest brass screw as seen when you look down on the carb. It's a push fit into a brass tube with alot of holes. lt'll become obvious when you undo the largest screw. I'd look up the main jet size for a standard ...
by paul d
Tue Dec 01, 2020 1:00 am
Forum: Vespa Tech
Topic: PX 125 Bogging down problem
Replies: 17
Views: 1691

Re: PX 125 Bogging down problem

Have you changed anything on the scooter like a non standard exhaust? I can't remember what the main jet is for a px125. If your scooter is standard then the standard main will be perfect. If you've changed the exhaust then the main jet has to be raised. Is there any oil leaking from the head? You c...
by paul d
Tue Nov 24, 2020 12:37 am
Forum: Lambretta Tech
Topic: cht gauge
Replies: 10
Views: 1266

Re: cht gauge

The questions above have put a smile on my face and to be honest, have caused many sleepless nights for very many people including myself! Normal range for me is anything between 140c to 180c. My scoots aren't standard. 180ish when travelling slow up long hills, slow into a continuous headwind or ch...
by paul d
Sun Nov 15, 2020 4:03 am
Forum: Vespa Tech
Topic: PX 125 Bogging down problem
Replies: 17
Views: 1691

Re: PX 125 Bogging down problem

I meant to say if it creeps forward when in gear!
by paul d
Sun Nov 15, 2020 3:58 am
Forum: Vespa Tech
Topic: PX 125 Bogging down problem
Replies: 17
Views: 1691

Re: PX 125 Bogging down problem

I'd say your gearchange issue is just a lubrication thing or a clutch cable that needs tightening. The clutch is adjusted under the engine and is obvious when you see it. If the bike is creeping forwards when the clutch is pulled then the cable needs to be adjusted and thats your gearchange issue. A...
by paul d
Mon Nov 02, 2020 1:34 am
Forum: Vespa Tech
Topic: PX 125 Bogging down problem
Replies: 17
Views: 1691

Re: PX 125 Bogging down problem

You could recheck and reset your mix screw. Simple check and it'll only cost you time. The mix screw is located at the back of the carb box and is accessable from the outside. Either a long screwdriver or a 7 or 8mm socket with an extension will get you past the shock spring and get you working. Sta...
by paul d
Sun Oct 25, 2020 12:35 am
Forum: Vespa Tech
Topic: Malossi 172 top end
Replies: 6
Views: 719

Re: Malossi 172 top end

Hi Andy. I'm not familiar with the BGM cylinder kit but if it needs a 135 main jet to run right, it's in a higher state of tune than a malossi 172. My 172 is on a standard T5 carb and with a scorpion exhaust it runs perfect with a 125 main. I think a 125 main jet is on the limit as regards flow from...
by paul d
Mon Oct 19, 2020 12:50 am
Forum: Vespa Tech
Topic: Malossi 172 top end
Replies: 6
Views: 719

Re: Malossi 172 top end

It should be quicker. I've a feeling the bgm big box might not rev enough but has boosted your low down torque. If the scooter is reving out the same in 4th as in 3rd then the exhaust might be the problem. I think it'll pull a 22 tooth clutch with that set up which would give an extra 5% ish top spe...
by paul d
Thu Sep 24, 2020 1:33 am
Forum: Lambretta Tech
Topic: Electronic ignitions
Replies: 7
Views: 862

Re: Electronic ignitions

Casatronic has been very reliable for me. Positives are reliability, easy starting, quality feel. Negatives are the flywheel holder could be stronger and in my case, brake light on at low revs means very poor headlight. led rear is essential!
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