How to Change the Oil in a 2012 GAS GAS TXT PRO 250
Shop parts for a 2012 GAS GAS TXT PRO 250 Dirt Bike.
Maintaining fresh oil in your 2012 GAS GAS TXT PRO 250 is critical for clutch performance and overall engine health. Unlike four-stroke bikes, the TXT PRO 250 uses separate oil in the transmission, not crankcase engine oil. Below you'll find a detailed guide to keep your trials bike running at its best, flush with proprietary MotoSport.com expertise.
Tools and Supplies Needed
- 8mm and 10mm Socket or Spanner (Confirm which fits your drain/filler bolts)
- Drain Pan for catching old oil
- Clean Rag for wiping drips and cleaning surfaces
- Funnel to avoid spills
- Replacement Crush Washer (highly recommended with each oil change)
- High-quality transmission oil: 370cc, recommended type: NILS CLUTCH TRIAL or specialist trials gear oil
- Torque Wrench (optional but ensures proper sealing pressure)
- Rubber Gloves (optional for cleaner hands)
Preparation Steps
- Warm up the bike first: Let the engine run for several minutes. This thins the oil, allowing it to drain more fully and flush out contaminants.
- Ensure the bike is upright: Use a center stand or position the bike on level ground so oil drains completely.
Step-by-Step Oil Change Instructions
- Locate the drain bolt: Underneath the right side of the crankcase, look for the drain plug. It's usually easily accessible, but refer to your manual or parts diagram if uncertain.
- Place drain pan beneath the drain bolt.
- Remove the drain bolt: Use your 8mm or 10mm spanner/socket. Crack it loose, then unscrew by hand. Allow old oil to fully drain. Double-check for any small washers (crush washers) that may be stuck to the case or bolt. Replace it if it's damaged, flattened, or missing.
- Inspect the removed oil: Look for metallic flecks. A few are normal in trials bikes, but visible chunks may suggest transmission or clutch plate issues. Clean the bolt and washer thoroughly.
- Wipe the sealing surface around the drain hole: This helps prevent leaks.
- Reinstall the drain bolt and new crush washer: Thread the bolt by hand, then gently snug it up. Do not overtighten: Overtightening is a common source of stripped threads. If using a torque wrench, torque to about 10–12 Nm (check manual for precise spec if available).
- Remove the oil filler cap: Located on the top/right of the engine case.
- Pour in new transmission oil: Use a funnel and pour exactly 370cc of your chosen quality gear oil into the filler.
- Inspect the oil sight glass: If equipped, check that oil level sits between min and max marks. If not, rely on the correct measured volume.
- Replace and tighten the filler cap: Make sure it's finger-tight; don't overtighten.
- Start the engine and let it idle for a minute. This allows oil to circulate throughout the clutch and transmission. After a few minutes, shut off and check for leaks at the drain plug and filler.
- Dispose of old oil responsibly at a recycling center or auto store.
Special Call-Outs for the 2012 GAS GAS TXT PRO 250
- These models have a transmission-only oil system, so you are not changing engine (crankcase) oil, just the transmission/clutch side.
- Transmission oil capacity is 370cc–do not overfill. Excess oil can make clutch drag or lead to leak issues.
- Quality matters: Use an oil formulated for wet-clutch trial bikes such as NILS Clutch Trial or specialist brands. Standard ATF or generic gear oil may cause the clutch to slip or grab unpredictably.
- Always inspect the drain bolt's magnetic tip (if equipped). Minor steel dust is normal from clutch plates, but large pieces may indicate trouble.
- Replace the crush washer every oil change. It's a cheap way to prevent leaks and thread damage. Overtightening is a common owner mistake; always tighten to just snug, using a small wrench.
- If you ride in muddy or wet areas often, consider changing oil more frequently—it keeps the box and clutch fresher, reducing wear.
Final Thoughts
With routine care using this MotoSport.com proprietary guide, your GAS GAS TXT PRO 250 will reward you with smooth clutch action and a long, trouble-free lifespan. If you're in doubt on oil type or change intervals, MotoSport.com's expert staff can help you select the best products for your trials bike and riding style.
Always refer to the rider's manual for the latest updates specific to your model and year.
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Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.