2003 Derbi GPR from Junk to Racetrack
Posted: Fri Jul 10, 2026 1:53 am
Hi,
i know this forum since some years and i want to present my GPR.
Bought for 250eur as it was just waiting to get ripped apart or to build up new from almost scratch after it was just stored outside for like 4 years. It had a crash so fairing was broken, the engine was poorly maintained and wasnt running cause there was massive amount of liquid sealent inside crankcase, cylinder....i had never seen such a mess.
So the Plan is to get this bike to be the fastest Moped in my Country, Slovakia and it has to run the Slovakiaring - not the Mickymouse Kart Track XD
So now its a D50B1 in it with a Airsal 80cc Techpiston Kit, Malossi 80cc Cup Exhaust, Bida PVL, S6 Waterpump, S6 Crank, Polini Evo 24mm Carb.
Now it runs on 14/48 120kmh/75mph Topspeed 24/7, with 15/48 it reaches 126kmh/78mph but already struggles powerwise to get faster - so ofc it will get a MHR Team TopEnd and some V-Force Reeds.
But the problem will be brakeing and suspension in the future. Weightwise its fully stock but stripped out of every streetlegal part including complete electronics.
Do some of you guys know where i can get better suspension and/or brakeing parts for this bike - preferably in europe. Also an upgraded radiator would be nice. What does fit behind the fairing and cools better then the og one?
Also my Rear Brakepedal is bent so i need a new one but i dont find it anywhere. And then im looking for the upper right black strip of fairing. If someone is having one of these parts laying around - just give me a call cause then its complete and im ready to visit a 3D Printercompany to finalize a cover for the upper light hole, an airchannel to the radiator from the lower light hole and to get a nicely new instrument cluster for a rpm gauge and temps.
Any help to get this bike to fullfill its destiny of being Slovakias fastest Moped at one point is appreciated
https://www.youtube.com/shorts/ddrLR48RWNw
i know this forum since some years and i want to present my GPR.
Bought for 250eur as it was just waiting to get ripped apart or to build up new from almost scratch after it was just stored outside for like 4 years. It had a crash so fairing was broken, the engine was poorly maintained and wasnt running cause there was massive amount of liquid sealent inside crankcase, cylinder....i had never seen such a mess.
So the Plan is to get this bike to be the fastest Moped in my Country, Slovakia and it has to run the Slovakiaring - not the Mickymouse Kart Track XD
So now its a D50B1 in it with a Airsal 80cc Techpiston Kit, Malossi 80cc Cup Exhaust, Bida PVL, S6 Waterpump, S6 Crank, Polini Evo 24mm Carb.
Now it runs on 14/48 120kmh/75mph Topspeed 24/7, with 15/48 it reaches 126kmh/78mph but already struggles powerwise to get faster - so ofc it will get a MHR Team TopEnd and some V-Force Reeds.
But the problem will be brakeing and suspension in the future. Weightwise its fully stock but stripped out of every streetlegal part including complete electronics.
Do some of you guys know where i can get better suspension and/or brakeing parts for this bike - preferably in europe. Also an upgraded radiator would be nice. What does fit behind the fairing and cools better then the og one?
Also my Rear Brakepedal is bent so i need a new one but i dont find it anywhere. And then im looking for the upper right black strip of fairing. If someone is having one of these parts laying around - just give me a call cause then its complete and im ready to visit a 3D Printercompany to finalize a cover for the upper light hole, an airchannel to the radiator from the lower light hole and to get a nicely new instrument cluster for a rpm gauge and temps.
Any help to get this bike to fullfill its destiny of being Slovakias fastest Moped at one point is appreciated
https://www.youtube.com/shorts/ddrLR48RWNw