Bajaj CT 100 Buyer's Guide: Mileage, Real-World Performance, and Used Market Reliability

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Estimating Long-Term Operating Costs

Assuming an average petrol price of ₹95 per litre, here is how the CT 100 performs financially over a 12-month period covering 12,000 kilometers (1,000 km per month):

• Monthly Distance: 1,000 km
• Estimated Real-World Fuel Economy: 72 kmpl
• Monthly Fuel Required: 1,0007213.88litres
• Monthly Fuel Expense: 13.8895₹1,319
• Annual Fuel Expense: 1,31912₹15,828

Routine maintenance costs are equally low. A periodic service requires roughly 1 litre of 20W-40 or 20W-50 engine oil, a primary foam air-filter cleaning or replacement, and minor chain tension adjustments—keeping basic service costs predictable.

9. Comprehensive Used Motorcycle Pre-Purchase Checklist

Because the CT 100 is no longer sold brand-new, prospective buyers will navigate the pre-owned market. Many units have seen heavy delivery use or long daily commutes. Use this practical, step-by-step inspection guide when evaluating a used CT 100:

[INSPECTION FLOW]

  1. Engine Cold Start  --> Check for blue/white smoke & valvetrain clatter

  2. Frame & Alignment  --> Inspect steering head, downtube weld, rim true

  3. Suspension Action  --> Check front fork stanchions & rear SNS damping

  4. Transmission Check --> Test clutch engagement, 4-speed shift indexing

  5. Legal & Paperwork  --> Match Engine/Chassis VIN to RC; check challans

1. Engine & Exhaust Diagnostics (Perform on a Cold Engine)

• Ensure the engine cylinder block is cold to the touch before starting. If the seller pre-warmed the engine, wait for it to cool down.
• Pull the kick-starter slowly with your foot to assess cylinder compression resistance. A healthy engine presents firm mechanical resistance.
• Start the bike and inspect the exhaust tip:
• • Blue Smoke: Indicates oil bypass through worn piston rings or dried valve stem seals. Avoid or factor in the cost of a top-end rebuild.
  • Dense Black Smoke: Signals an over-rich fuel mixture caused by carburetor jet wear or a clogged air filter.
  • White Watery Vapor: Normal condensation during cold starts; should clear within two minutes.
• Listen for abnormal mechanical noise from the cylinder head: sharp metallic tapping suggests excessive valve clearance, while a loose rattling hum points to a worn cam chain or faulty tensioner.

2. Suspension, Frame, and Alignment

• Inspect the telescopic front fork stanchions for scratches, pitting, or dried road grime mixed with oil, which indicates ruptured fork seals.
• Compress the front forks hard by holding the front brake lever and pushing down on the handlebars. The stroke should compress and rebound smoothly without bottoming out or clicking.
• Inspect the dual rear SNS shock absorbers for hydraulic fluid leaks around the inner dampers. Check the swingarm bushes by holding the rear wheel and attempting to wiggle it side-to-side; any noticeable lateral play indicates worn swingarm bushings.
• Sight down the center line of the frame from front to back to verify that the wheels track true and that the chassis has not been twisted in an accident.

3. Transmission & Clutch Operation

• Check the clutch lever free-play (ideal free-play is 10 to 15 mm).
• Shift through the 4-speed all-down transmission. Shifts should engage cleanly without popping out under load.
• Accelerate firmly in 3rd gear from 25 kmph: if the engine revs climb rapidly without a proportional increase in road speed, the clutch plates are slipping and require replacement.

4. Wheels, Tyres, and Braking

• Spin both wheels freely on the center stand. Look for wheel wobble on alloy variants or bent rims/loose spokes on spoke-wheel models.
• Check tyre tread depth and look for sidewall cracks or irregular scalloped wear patterns, which suggest improper wheel balancing or misaligned axle adjusters.
• Verify drum brake lever travel and check the condition of the brake wear indicator arrows on the hub plates.

5. Documentation, RTO Paperwork, and Challan Verification