De-restricting for pre and post-2000 engines is done in two parts. For the post-2000 engines, there is an additional step of adjusting carburettor jetting as well. Prepare a clean work area and make sure all necessary tools and parts are nearby and ready for use. Open up the Vespa engine case and locate the outer engine pulley. Don't bother it's a 4 stroke 125, the extra power you'll gain will be virtually non exsistant. If you want to tune it then stroke a smoker. If you must then you can get universal cone filters on ebay that would be an easy fit. You could then debaffle your original pipe instead of bodging one to fit. Your 'race CDI' will maybe give you a stronger spark.It will al How To Derestrict A Honda XR 125. The Honda XR125 will have a top speed of around 55-60mph which in some instances can be frustrating for the rider as you lack the ability to over take at the top end of things. The Honda XR 125 is a 4 stroke and cannot be derestricted because it runs at full capacity as is. Post by mattack onAug 14, 2011 at 6:38pm. Cut one of the two violet/pink wires going to the cdi! Free and will get you from 30 to 37mph! The cdi is behind the battery. Check your variator boss, some kymco super 8s come with the restricted variator. Lastly up your main jet from the 78 to an 80 or 82. 150cc '08 Baron Merato 150T. SOURCE: de-restrict an aprilia rs 125 You shouldn't have to restrictions only happen on faster bikes 600cc onwards but if you talking about the inabilty to push your revs to the very max, I wouldn't do this unless you know what you doing, and by you asking this question, you don't know what u doing, this rev restriction is set in place for safety of your engine, rather than restricting speed.,,, 234 months. [report] [news] Monday 19th December 2005. All mopeds by law are restricted to 49cc & 30mph max although in theory you may get 35 if your lucky. Restriction comes in many forms, the Installed the blade with the flat side facing up and the tapered side facing down (when retracted, the slope on the end of the blade lines up with the exhaust wall). Install the solenoid on the right hand side of the battery box. Connect the cable to the blade. Adjust the solenoid once it is in place. September 2008. Step 1 remove spacer which is between the front variator pulleys. search for variator derestricting. Anyone with step 2 please post. Anonomous. September 2008. i've taken mine to robspeed motorcycles in cleethorpe road, grimsby £60.. goes around 47-52mph.. just take it to local bike dealers. JDkOW4.