Malossi 166 rear wheel lock up!

Fitted a Malossi 166 to my PX125e disc. Everything seemed fine, covered 350km so opened her up a bit more. Was well impressed with the extra power/speed. Had her up to 65mph, came off the power and the scoot just died, back wheel locked up and I had fun getting her under control. When I pulled up the engine was still running and sounding ok. All seems ok now and have covered a few more hundred km, but I'm scared to open her right up. I have a Sip Performance exhaust and have a 107 main jet, which is the correct jet for that pipe apparently. Everything else is standard. Is a bigger carb going to be the best answer? I'm guessing it's not getting enough fuel at high throttle. Any help on this would be great. Cheers.

Put a 115 mainjet in the carb and work you way down, I would guess around 110-112 might be fine

hallo..greetings from malaysia...i owned a vespa sprint v with malossi166kit....
which exhasut that you suggest for me to buy for a highway and long run trip?i'll need an exhasut that have higher top speed and less vibration in high speed..the exhasut that i have in mind is JL right hand,JL left hand,SIP Performance left hand, and PM exhaust...which of these would you highly recommend to me...thanks....

Hi, Put in the 115, ran terrible, wouldn't go over 40mph. Down to a 105 at the moment and all seems well. I have now done 1000km + since fitting the kit. Cheers for your advice.

you had a sieze engine ran weak on over run worth checking timming and jetting