Vespa ET4 125 Firecracker bang when starting up?

Florencer5 · L Plate Warrior Joined: 03 Aug 2018 Karma :

Hi I'm new to this forum and new to bikes!

I've recently bought a 1998 Vepsa Et4 125cc, it originally had some problems with the carburettor which had to be replaced.

It has been running perfectly for the past 2 weeks, but the past couple of days I've had problems starting it. I charged the battery over night and that seemed to help for the following day but now when ever I try to start it up it really struggles and makes a loud bang/pop sound almost like a fire cracker and something shoots out the back.

I'm a complete newbie so have absolutely no idea what could be the problem.

Can anyone help??? Sad

jaffa90 · World Chat Champion Joined: 06 Apr 2016 Karma :

If charging the battery overnight helps it the next day find out if the battery and the bikes charging system is working ok and you have no leakage / battery drain.

Florencer5 · L Plate Warrior Joined: 03 Aug 2018 Karma :

jaffa90 · World Chat Champion Joined: 06 Apr 2016 Karma :

What is the battery voltage reading (as in 12.8v) 12 hours after being charged?

WD Forte · World Chat Champion Joined: 17 Jun 2010 Karma :

It 'sounds' as if you have an air leak or fuel starvation.
Maybe the carb inlet has worked loose etc? but only examination by someone familiar with bikes/scoots would know where and how to look.
Forum advice can only be best guesses at best and the quality of these guesses depends on the quality of info provided.

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