Need help?Do you have a question about the Derbi GP1 125-250 c.c. and is the answer not in the manual?
Lists torque values for various chassis fasteners and components.
Details torque specifications for exhaust system and engine lubrication components.
Provides torque values for cylinder head, timing system, and transmission parts.
Specifies torque values for flywheel, starter motor, and crankcase components.
Covers oversizes engine 250, crankcase-crankshaft, and connecting rod bearing data.
Lists special tools like air heaters, multimeters, and pliers for specific tasks.
Details tools for hub bearing fitting, engine support, and flywheel extraction.
Lists tools for valve removal, oil seal extraction, and pressure measurement.
Covers tools for crankcase detachment, piston fitting, and drive pulley stop keys.
Lists tools for valve cotter removal, guides, adaptors, and pump overhaul.
Details tools for crankshaft alignment, guides, and magnetic stands.
Covers tools for 15mm pliers, adapter rings, drifts, and flywheel extractors.
Provides a detailed maintenance schedule based on mileage and time intervals.
Instructions for disassembling, cleaning, and checking carburettor components.
Detailed instructions for checking, adjusting, and replacing the spark plug.
Details on cleaning and replacing the air filter, including cautions.
Instructions for checking and replacing engine oil, including torque specifications.
Guidance on checking ignition timing using a stroboscopic lamp.
Procedure for checking and adjusting valve clearance.
Guidance on checking and topping up brake fluid, including cautions.
Steps for unfastening and removing the exhaust manifold and muffler.
Detailed procedure for disconnecting and removing the engine from the chassis.
Instructions for removing the automatic transmission cover and related parts.
Procedure for removing the driven pulley shaft bearing using specific tools.
Detailed steps for clutch removal using specific tools and procedures.
Detailed steps for refitting the clutch using specific tools and procedures.
Instructions for reinstalling the driven pulley, including belt checks.
Procedure for removing the driving pulley using specific tools.
Instructions for refitting the driving pulley, including shim and nut tightening.
Steps for removing the flywheel magneto using specific tools.
Instructions for refitting the flywheel magneto, including torque values.
Covers removal and inspection of cylinder, camshaft, and timing system components.
Instructions for removing the cylinder, piston, rings, and pin.
Instructions for correctly installing piston rings onto the piston.
Procedure for fitting the cylinder, base gasket, and ensuring lubrication.
Instructions for refitting timing system components, including chain and tensioner.
Covers splitting crankcase halves, removing crankshaft, and related checks.
Instructions for assembling crankcase halves, including bulkhead, oil filter union, and gasket.
Procedure for checking oil pressure at different engine speeds.
Procedure for disconnecting and removing the carburettor from the engine.
Instructions for cleaning and refitting the carburettor components.
Steps for dismantling the front suspension forks and their components.
Steps for dismantling the rear suspension arm and shock absorber.
Steps for dismantling the front brake caliper and related parts.
Instructions for lubricating, fitting, and tightening front wheel components.
Steps for dismantling the rear brake caliper and related parts.
Detailed procedure for bleeding air from the rear brake system pipes.
Procedure for overhauling the water pump, including component inspection.
Procedure for overhauling the water pump using special tools and press.
Presents the complete wiring diagram for GP1 125-250 models.
Checks ignition circuit components, including HV coil and pick-up resistance.
Procedures for checking stator continuity and voltage regulator output.
Instructions for initial battery charging, capacity, and care.
Procedure for recharging the hermetic (airtight) type battery.
Diagnoses and solutions for poor engine performance issues.
Diagnoses and solutions for common engine starting problems.
Troubleshooting steps for high oil consumption and smoky exhaust.
Diagnoses and solutions for low lubrication pressure issues.
Troubleshooting steps for engine stalling at full throttle.
Diagnoses and solutions for engine stalling at idle speed.
Troubleshooting steps for insufficient braking performance.
To Next Page
General
