20 Most Recent
2005 Derbi GPR 125 Racing - Page 2 Questions & Answers
Front brake constant squeal
The seals in the caliper flex when the brake is applied, and when released, they return to their original position.
When they do this, they are suppose to pull the piston(s) back with them.
As they age, they tend to harden, and not work as good.
You could try replacing the piston seals, and insure the pistons and their bores do not have any corrosion or crud on them.
Can I extend cylinder for
You can get a 150cc bore kit from derbi which is very easy to fit and cheap. It's on derbi.com and will give you a performance increase of about 5 HP bringing your total to about 20hp. Once you do that you can get a bigger exhaust also from derbi which should add another 3hp. I have the derbi gpr125 4t and I have done all the above, top speed is about 90mph and accelerates very very fast. Good luck.
Strange clicking noise,seems to be coming from the
I too would head for the speedo cable, but if you say you have checked it let's move on. Did you try "removing" the speedo calbe yet? Might be worth a try.
After that we're looking at brakes, wheel bearing, or an interferance issue. Have you tried setting the front end up on a tire stand and rotating the wheel by hand to see if you can replicate it without riding? I would start there.
Broken key in ignition
if you can get it off of the bike which should only be a couple of bolts and a wire harness...take it to a good locksmith. They might know a trick on how to get the broken piece out. good luck.
I have trouble starting my scooter, the indicators
I can't find the a micro phish on but if i where to guess where to start it would be the start clutch or idler gear
Some bike use a sprag clutch it lets it engageone way and free spin the other works great but can get worn out.
Pull your starter out most bikes two bolts and a + wire that comes from your relay. after you have in your hot light hand take a battery and a set of jumper cables clip the groung (-) the body and the positive (+) the to the post. Now clip the ground to the battery and while holding the starter down touch the positive to the battery if you start is working right it should spin fast and want to jump off the table. if so check your starter clutch, or idler gear.
Chain
Yes All motorcycle chains currently being manufactured use Buna-N (Nitrile) rubber for their o-rings and x-rings and all these manufacturers recommend kerosene as a cleaner.
Here's the formulation of WD-40:
80% Stoddard Solvent (that is similar to kerosene)
20% light lubricating oil and a bit of fragrance.
Here's the compatibility of Stoddard Solvent with rubbers and plastics:
Good Compatibility (OK for both static and dynamic seals)
Buna-N (Nitrile)
Chemraz
Epichlorohydrin
Fluorocarbon
Fluorosilicone
Kalrez
Nitrile, hydrogenated
Polyacrylate
Teflon, virgin
Mixed Compatibility (OK for static seals, but not for dynamic seals)
Neoprene
Vamac
Fair Compatibility (OK for some static seals)
Polysulfide
Polyurethane, millable
Poor Compatibility
Butyl
Ethylene-Propylene
Hypalon
Natural rubber
Silicone
Styrene Butadiene
Consequently, WD-40 is safe and effective as a chain cleaner and corrosion inhibitor.
Link:
http://www.efunda.com/designstandard...dard%20Solvent
If you clean with a soft brush and WD-40, and plan to follow-up with a chain lube, you can reduce chain lube sling-off if you first remove the oil residue that WD-40 leaves. This residue seems to prevent some chain lube formulations from sticking well to the chain.,,,
How to set my Gilera sc125 clock display
The Gilera SC is the same as a Derbi GPR ,right?
This is how I change the time on my Derbi
Tap the button until it goes to the clock then hold it in until it starts flashing. Tap to change the hour then leave it for a second and it will move over to the minutes and cycle through, just tap it to stop on the right time.
The batteries are **** though so don't expect it to keep the time, you'll find yourself having to set it nearly every time you start your bike.
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