SYM DRGBT 158 (DRG 160) — OEM Fluid, Tire Pressure & Maintenance Specs
158cc Liquid-Cooled Single SOHC 4-Valve with ZRSG Start-Stop & Center Monoshock · Source: SYM DRGBT 158 (DRG 160) (2020–Present) Official Owner’s Manual Maintenance Specifications
According to the SYM DRGBT 158 (DRG 160) (2020–Present) Official Owner’s Manual Maintenance Specifications, the 2020–Present SYM DRGBT 158 (DRG 160) (chassis TB16W1/TB16W2) requires 1 L (1.06 US qt) of SAE 10W-40 (JASO MB, API SJ/SL Synthetic Blend 10W-40) engine oil for a drain-only change and 1.05 L (1.11 US qt) with filter service (15421-GY6-900 (Strainer Screen & O-Ring)). Standard solo cold tire pressure is 180 kPa / 1.80 bar / 26 PSI front (120/70-13 53P) and 200 kPa / 2.00 bar / 29 PSI rear (130/70-13 63P), paired with 1× NGK CPR8EA-9 spark plug(s) and a YTX7A-BS / TTZ7SL battery.
Drain only: 1 L (1.06 US qt)
R 200 kPa (2.00 bar)
Est. Range: ~292 km (181 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Dry Centrifugal CVT Belt Drive |
|---|---|
| Recommended Viscosity & Grade | SAE 10W-40 · JASO MB · API SJ/SL Synthetic Blend 10W-40 |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 1 L (1.06 US qt) • With filter/strainer: 1.05 L (1.11 US qt) • Complete dry overhaul: 1.2 L (1.27 US qt) |
| OEM Oil Filter Code & Type | 15421-GY6-900 (Strainer Screen & O-Ring) |
| Correct Oil Level Check Method | Hold upright on level ground; rest dipstick UNTHREADED on filler neck (do NOT screw in) |
| Oil Drain Bolt Torque | 25 N·m (18.4 lb-ft / 2.55 kgf·m) — Use fresh crush washer |
| Final Drive / Bevel Gear Oil | 100 ml (0.10 L) — SAE 85W-140 API GL-5 Rear Gear Oil (100 ml drain / 110 ml total) |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 120/70-13 53P · Rear: 130/70-13 63P (Tubeless) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 180 kPa / 1.80 bar / 26 PSI Rear: 200 kPa / 2.00 bar / 29 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 180 kPa / 1.80 bar / 26 PSI Rear: 225 kPa / 2.25 bar / 33 PSI |
| OEM Spark Plug & Quantity | NGK CPR8EA-9 × 1 (Gap: 0.7–0.8 mm) |
| OEM Battery Code & Rating | YTX7A-BS / TTZ7SL (12V 6.0Ah MF AGM) |
| Final Drive Maintenance | Dry Centrifugal V-Belt CVT — Inspect/replace V-belt and rollers every 15,000–20,000 km |
| Brake Fluid & Coolant | DOT 4 · OAT ethylene-glycol coolant for aluminum radiators (50:50 premix) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 158 cc · 15.6 hp @ 8,000 rpm · 15 N·m (11.1 lb-ft) @ 5,500 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 803 mm (31.6 in) · 137 kg (302 lbs) |
| Fuel Tank & Est. Real-World Range | 7.4 L (2.0 US gal) · ~39.5 km/L → ~292 km (181 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 300 km • Engine Oil / Filter: 3,000 km / 6,000 km • Air Filter / Spark Plug: 6,000 km / 10,000 km • Valve Clearance Check: 10,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
SYM’s flagship dragon-styled sport scooter combining 50:50 weight distribution, an inclined center monoshock, anti-lift engine hanger (ALEH), and zero-resistance ZRSG starter.
Oil & Clutch Mechanical Engineering Note
Holding just 1.0 L of oil in a high-revving 158cc 4-valve single, run full-synthetic SAE 10W-40 JASO MB every 2,500–3,000 km and drain the 100 ml rear gear case every second oil change.
Garage Wrenching Gotchas
- Its right-side engine-mounted radiator sits low in road spray—rinse cooling fins gently with low-pressure water so mud buildup does not trigger high-temp warnings.
- The exposed right-side rear wheel mounts via a single high-torque axle nut—torque to factory spec (110–120 N·m) and paint a witness mark after tire changes.
5. Frequently Asked Questions (FAQ)
What are the engine oil and rear hub gear oil capacities for the SYM DRGBT 158 (DRG 160) scooter?
With an isolated dry CVT belt case, the engine requires 1 L drain-only or 1.05 L (1.11 US qt) with filter/screen (15421-GY6-900 (Strainer Screen & O-Ring)) of SAE 10W-40 (JASO MB). Service the rear reduction hub separately (final drive 100 ml).
How do you accurately check the oil level on the DRGBT 158 (DRG 160), and what are its service intervals?
Hold the bike upright on level ground 2–3 minutes after shutdown, wipe the dipstick, and rest it on the filler threads without screwing it in (threading it in reads artificially high and risks oil starvation). Torque the drain plug to 25 N·m with a new crush washer. Factory oil change intervals are every 3,000 km, with valve clearance inspection every 10,000 km.
What are the cold tire pressures, puncture repair type, seat height, and range of the DRGBT 158 (DRG 160)?
Fitted with 120/70-13 53P front and 130/70-13 63P rear tubeless rims (compatible with roadside plug kits), set cold tire pressures to 26 / 29 PSI (180/200 kPa) solo or 26 / 33 PSI loaded. Seat height is 803 mm (31.6 in) at 137 kg wet weight, delivering ~292 km per 7.4 L tank.