Poor rear sprocket fitment - keeps coming loose
You're not the first sadly - http://www.visordown.com/forum/forummessages/mps/dt/4/UTN/10029/
Studs would seem to be the way to go
Thanks for your reply.
I wonder if the Aprilia RS 50 of the same year has the same problem? Both bikes look exactly the same but possibly the aprilia may have improved sprocket fitment.
I would of thought that this fault would be widely known all over the Net but I have not found much info.
I'm not well up on tiddlers I'm afraid. Is the Derbi just a badged Aprilla? If so it's probably the same set-up. Not that many Derbis on the roads over here so maybe there's no wide-spread info available.
The problem looks to be a lack of any sort of cush drive so any transmission shocks will go straight through the mounting bolts. Add a teenager with clumsy gearchanges and probably a bone-dry and loose chain ...... <img /><img />
My son has a 2008 Aprilia RS50, the back sprocket is held on by nuts screwed on to stud's. You can use Aprillia parts to change to stud's.
Glad you Son was OK after the accident. There is definately a big problem with the chassis and all models should have been recalled.
The frame can crack below headstock area, more info here:
hello, i have recently brought a derbi GPR 50cc, im loving the bike and the way it rides, one slight problem it seems to smoke alot out of the exhaust when i take it past 700rpm?
can any one tell me why this would be?
please let me know would be much appreciated
hi im putting a derbi gpr 50cc racing together and was wondering if anyone has a wiring diagram or know were i can get one from thanks
There are quite a few wiring diagrams here, and I think this is the Derbi GPR50 Racing here.
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