missfiring after fitting fast flow

[baldmeister]

hi all,
i have just fitted a fast flow bgm tap to my dr180 with 24mm carb vespa.
it has started popping and loudly backfiring when it gets into 4th and seems to die a little. then it starts to go realy well??
any ideas.

[mijapxman]

I assume everything was fine before you fitted the fuel tap?

Sounds electrical, check all wires going from the stator to the cdi, Ht lead and spark plug.

Come back if that doesn't work.

Mij☺

[baldmeister]

hi, changed the plug, old one was covered in carbon bits, so hoovered out inside the head!! also made the hole in the fuel cap bigger. going fine now. wheeeee!!

[swm]

😳