GAS GAS EC 125 - 2003 User Manual (English)

Questions and Answers:

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georgejasmineSep 6, 2025
What causes abnormal train noise on my GAS GAS EC 125 - 2003?
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  John KingSep 6, 2025
  Abnormal train noise in your GAS GAS Motorcycle can stem from several issues. The drive chain might be adjusted improperly, so you should adjust chain. The chain itself could be worn, so you should change chain and rear engine sprocket. Additionally, worn rear and/or engine sprockets, insufficient chain lubrication, a misaligned rear wheel, insufficient or too thin front fork oil, a weak or broken spring, a worn disc brake, incorrectly installed or glazed pad surface, or a damaged cylinder could all contribute to the noise. Go to specialized garage.
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morgan54Sep 7, 2025
What causes spark knock in my GAS GAS EC 125 - 2003 Motorcycle engine?
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  Kimberly ThompsonSep 8, 2025
  Spark knock in your GAS GAS Motorcycle engine can be due to carbon buildup in the combustion chamber, so you should clean combustion chamber. It could also be caused by incorrect or poor gasoline, so empty and fill up with good gasoline. An incorrect spark plug or damage to the connecting rod exhaust system can also lead to spark knock. Check if the exhaust system is damaged and change connecting rods.
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carrie08Sep 9, 2025
Why are my GAS GAS Motorcycle brakes not holding?
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  Ms. Jacqueline CarterSep 9, 2025
  If the brakes on your GAS GAS Motorcycle aren't holding, it could be due to a worn pad or disc, so you should change disc. It might also be caused by a brake fluid leak (check and replace), deteriorated brake fluid (empty and replace with new recommended one), a damaged piston pump (replace pump piston), or brake maladjustment (adjust brake).
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Eric MillerSep 12, 2025
What causes shock absorption to be too hard on my GAS GAS Motorcycle?
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  Anne KnightSep 12, 2025
  If the shock absorption on your GAS GAS Motorcycle feels too hard, it could be due to excessive front fork oil, so empty and review level oil. The front fork oil viscosity might also be too high, so empty oil from fork and go to specialized garage. Other potential causes include a bent front fork leg, tire air pressure too high (check tire air pressure), or a maladjusted rear shock absorber (check rear shock absorber).
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Morgan SullivanSep 12, 2025
What causes shock absorption to be too soft on my GAS GAS Motorcycle?
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  amanda94Sep 12, 2025
  If the shock absorption on your GAS GAS Motorcycle is too soft, it may be due to insufficient and/or leaking front fork oil, so fill up until correct level. It could also be caused by front fork oil viscosity being too low, so empty oil from fork and fill up with suitable viscosity oil. Other possible reasons are a bent front fork leg, tire air pressure too small (check tire air pressure), or a maladjusted rear shock absorber (check rear shock absorber).
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April WatsonSep 14, 2025
What could cause instability in my GAS GAS Motorcycle?
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  Christian SmithSep 14, 2025
  If you are experiencing unsatisfactory stability with your GAS GAS Motorcycle, it could be due to incorrect control cable routing (move control cable or unscrew), incorrect wiring routing (unscrew wiring routing), a steering stem locknut that is too tight (change steering stem locknut), or a bent steering stem (change and go to specialized garage).

GAS GAS EC 125 - 2003 Specifications

General

Year	2003
Manufacturer	GAS GAS
Model	EC 125
Category	Motorcycle
Engine Type	Single cylinder, two-stroke
Displacement	124.8 cc
Bore x Stroke	54 x 54.5 mm
Fuel System	Carburetor
Ignition	CDI
Cooling System	Liquid cooled
Transmission	6-speed
Final Drive	Chain
Front Brake	Single disc
Rear Brake	Single disc
Front Tire	90/90-21
Rear Tire	120/90-18
Rear Suspension	Monoshock
Fuel Capacity	9.5 liters
Front Suspension	Marzocchi Upside-down telescopic hydraulic fork