✨ Product Overview

Restore peak compression and reliability to your Kubota or Bobcat equipment with this professional-grade piston assembly kit. Precision-manufactured to OEM specification 16423-21910, this complete set includes an aluminum-silicon piston, hardened full-floating pin, retaining clips, and a matched 3-ring assembly optimized for Kubota V2203 IDI and D1703 diesel engine platforms [[1]][[4]]. Engineered for demanding heavy-duty cycles in excavators, tractors, skid steers, and industrial power units.

Part Numbers
OEM: 16423-21910
Also: 16423-21911, 16423-21110 [[3]][[7]]

Bore Spec
87.00 mm / 3.425"
Standard (STD) Only

Piston & Rings
Piston: Al-Si Alloy
Rings: Chrome/Moly Top, Taper 2nd, 3-Pc Oil

Kit Includes
1x Piston + Pin + 2 Clips
Complete 3-Ring Set per Cylinder

🔧 Technical Specifications

Piston

Aluminum-Silicon Alloy
Low Thermal Expansion

Full-Floating Design
Induction Hardened Steel

Top Ring

Chrome/Molybdenum
High-Pressure IDI Sealing

Oil Ring

3-Piece Assembly
Steel Expander + Thin Rails

Specification	Detail
Engine Platform	Kubota V2203 IDI / D1703 (1.7L-2.2L Diesel)
Bore Diameter	87.00 mm (STD)
Compression Ratio	~22.0:1 – 24.0:1 (IDI/DI Variant Dependent)
Operating Temp	-30°C to +280°C (Diesel Combustion Rated)
Lubrication	10W-30/15W-40 API CF/SF Diesel Oil
Weight (Kit)	Approx. 0.95 kg / 2.09 lbs
Service Life	4,000–6,000 Hours (Pro Rebuild Spec)
Warranty	6 Months Manufacturer Coverage

✅ Key Benefits

OEM Precision Fit: Direct replacement for factory assemblies – verified 87.00mm bore tolerance
Al-Si Alloy Construction: Reduced thermal expansion minimizes piston slap and extends cylinder life in IDI engines
Chrome/Moly Top Ring: Superior high-pressure sealing for indirect injection diesel combustion
Full-Floating Pin: Even load distribution reduces connecting rod bushing wear and operational noise
Wide Platform Fit: Compatible with Kubota V2203/D1703 AND Bobcat T190/T250/T300/S175/S250 equipment
Verified Cross-Reference: Supersedes 16423-21911, 16423-21110 – guaranteed compatibility [[3]][[7]]

🏭 Full Engine & Equipment Compatibility

Platform	Equipment Models (Partial)	Engine Code	Fitment
Kubota Excavators	KX161, KX191, KX361, U45, U55, U80	V2203 IDI	✅ Direct Fit
Kubota Tractors	L2800, L3200, L3400, L3800, M4900, M5640	V2203 / D1703	✅ Direct Fit
Kubota Skid Steers	SSV65, SSV75, SVL75, SVL90	V2203	✅ Direct Fit
Bobcat Equipment	T190, T250, T300, S175, S250, S300, E50, E55	V2203 (OEM Kubota)	✅ Direct Fit [[9]]
Industrial/Ag	Generators, Welders, Pumps, Compressors	V2203 / D1703	✅ Direct Fit

⚠️ CRITICAL FITMENT NOTE:
This piston kit is sized for 87.00 mm STANDARD BORE cylinders only. DOES NOT FIT V1505/V1703 (smaller bore), V2403/V3300 (larger bore), or oversize bores (+0.25/+0.50/+0.75/+1.00mm). Verify your engine model plate, serial number, and bore measurement before ordering. Incorrect bore size will cause immediate engine failure or catastrophic cylinder scoring.

🔄 Cross-Reference / Interchange Numbers:
Kubota OEM: 16423-21910, 16423-21911, 16423-21110, 16423-21050 [[1]][[3]][[7]]
Aftermarket Equivalents: Mahle: 080 0272; Kolbenschmidt: 50013601 (verify application)
Engine Platforms: Kubota V2203 IDI, D1703 (1.7L-2.2L 3/4-Cyl Diesel)

🔧 Installation Guide (Professional Diesel Technician)

Preparation: Drain oil/coolant; remove cylinder head & oil pan; extract old piston/connecting rod assembly
Cylinder Inspection: Measure bore at 3 heights to confirm 87.00mm STD; check taper/out-of-round (<0.03mm tolerance)
Ring Installation: Install oil ring expander first, then rails (stagger gaps 120°), 2nd compression (mark "TOP" up), then chrome/moly top ring
Pin & Clip Installation: Lubricate pin bore & pin; insert pin; install retaining clips (verify fully seated with magnification)
Gap Verification: Check end gaps in bore per Kubota spec (typically 0.25-0.45mm top, 0.20-0.40mm 2nd for IDI engines)
Piston Insertion: Use precision ring compressor; lubricate cylinder walls with assembly lube; gently tap into bore
Rod Assembly: Install rod cap with new bearings; torque to OEM spec in multi-stage sequence (typically 35-45 Nm + angle)
Commissioning: Reassemble head/pan; prime oil system; start engine; monitor compression, oil pressure, and exhaust smoke

⚠️ Critical Installation Notes:
• CONFIRM 87.00mm BORE before installation – incorrect size causes immediate failure
• Stagger ring gaps 120° apart to prevent blow-by and oil pumping in IDI combustion chambers
• Use ONLY Kubota-approved diesel engine oil (10W-30/15W-40 API CF) during break-in
• Retaining clips MUST be fully seated – loose clips cause cylinder scoring and piston seizure
• Follow OEM break-in: 50 hours light load, then gradual power increase; change oil after break-in
• Professional diesel technician installation required for warranty validity

📦 What's in the Box

1x Aluminum-Silicon Piston (Part Ref: 16423-21910)
1x Full-Floating Hardened Steel Piston Pin
2x Piston Pin Retaining Clips (Circlips)
1x Complete 3-Piece Ring Set (Top, 2nd, Oil Control)
Ring Gap & Installation Specification Sheet (Kubota Compatible)
Warranty Registration Card (6-Month Coverage)

❓ Frequently Asked Questions

Q: Will this fit my Bobcat T250 skid steer with Kubota V2203 engine?: A: Yes – Bobcat T190/T250/T300/S175/S250 models use OEM Kubota V2203 engines. Part 16423-21910 is a direct fit. Verify engine plate and 87mm bore [[9]].
Q: Does this kit include the piston pin and clips?: A: Yes – complete assembly includes piston, full-floating pin, 2 retaining clips, and full 3-ring set. No additional components required.
Q: Can I use this for an oversize bore rebuild?: A: No – this kit is strictly for 87.00mm STANDARD bore cylinders only. Oversize applications require matched oversized pistons and rings.
Q: What's the difference between V2203 IDI and D1703?: A: V2203 is 4-cylinder indirect injection (2.2L); D1703 is 3-cylinder direct injection (1.7L). Both share the 87mm bore and this piston kit.
Q: How many kits for a full engine rebuild?: A: V2203 (4-cylinder): 4 kits required. D1703 (3-cylinder): 3 kits required. Order quantity accordingly.

✅ Dispatch from Global Hubs | ✅ Secure Packaging | ✅ 30-Day Returns | ✅ Diesel Expert Support

Disclaimer: Kubota®, Bobcat® and associated model names are trademarks of their respective owners. This listing is for aftermarket replacement piston kits meeting or exceeding OEM specifications. Part number 16423-21910 verified against Kubota parts databases [[1]][[3]][[7]]. CRITICAL: Sized EXCLUSIVELY for 87.00mm STANDARD BORE cylinders – verify engine model plate and bore measurement before ordering. UPC/EAN marked "Does Not Apply" per eBay policy for heavy equipment components. Always verify engine serial, bore dimensions, and use Kubota-approved diesel lubricants. Professional diesel technician installation required.

16423-21910 Piston, Pin & Ring Set for Kubota Bobcat 87mm STD V2203 IDI D1703

Includes :
1 Piston
1 Piston Pin
1 Ring Set
2 Clips

Piston Size: 87mm
Pin Bore Size : 25mm

16423-21910 16423-21110 19077-21912 17331-21050

!!..BULK INQURIES ARE ALSO ACCEPTED AT ATTRACTIVE PRICES..!!

PISTON RINGS: THIS ABOVE LISTING IS QUANTITY FOR 1 PISTON IE 1CYL.

IF, YOUR ENGINE IS FOR 2CYL / 3CYL / 4CYL / 6CYL / 8CYL ENGINE PISTONS, THEN YOU PLEASE BOOK YOUR ORDER QUANTITY ACCORDING TO YOUR ENGINE.

OVERSIZE: IF YOU DO REQUIRE OVERSIZE PISTON RINGS ALSO LIKE 010 / 020 / 030 / 040 / 060 / 080 / 100 ETC.

WE CAN ALSO BE ABLE TO SUPPLY YOU THE SAME. IF OVERSIZE, PLEASE MESSAGE US WHAT SIZE YOU DO REQUIRE TO CHECK & ARRANGE ITS AVAILABILITY.

SPECIAL SIZE: IF ANY SPECIAL SIZE IS REQUIRED FOR YOUR ENGINE, PLEASE DO INFORM WE CAN ABLE TO ARRANGE THE SAME FOR YOU ALSO?

SPECIAL PRODUCT: ANY KIND OF AUTO PARTS, WE ABLE TO SUPPLY YOU AGAINST YOUR SAMPLE / DRAWINGS. WE ABLE TO MANUFACTURE & SUPPLY THE SAME ACOORDING TO CUSTOMER?S REQUIREMENT.

RETURN POLICY: WE ALWAYS TRY OUR BEST FOR HASSALE FREE BUSINESS TRANSACTION. BUT STILL IF ANY PROBLEM OCCUR, BEFORE OPENING ANY KIND OF RETURN REQUEST, YOU CAN CONTACT US DIRECTLY WE ARE HAPPY & TRY TO SATISFY YOU IN ALL RESPECT? IN CASE OF ANY PROBLEM LIKE DIDN?T LIKED OR DIDN?T FIT, WE ARE READY TO REFUND YOU AFTER THE INSPECTION OF THE ORIGINAL PRODUCT & MUST BE INTO ITS ORIGINAL PACKAGING. BUYER PAYS FOR THE RETURN SHIPPING CHARGES.

FEEDBACK: YOUR POSITIVE FEEDBACK IS IMPORTANT & VALUABLE TO US. WE ALWAYS LEAVE POSITIVE FEEDBACK TO OUR BUYER AS A GOOD MEMORY FOR SMOOTH BUSINESS.

EBAY MESSAGES: YOUR ALL MESSAGES ARE IMPORTANT TO US. WE KNOW TIME IS VERY IMPORTANT. WE ARE TRYING TO DO QUICK REPLY, BUT SOMETIMES PLEASE ALLOW RESPONSE TIME 12-48HRS.

COMPATABILITY: WE HAVE LISTED ALL OUR PRODUCTS WITH MUCH & MUCH INFORMATION AS POSSIBLE BY US. WE DO UNDERSTAND FROM LISTING YOU CAN ABLE TO GET ALL THE POSSIBLE DETAILS WHICH YOU REQUIRED ALSO YOU CAN CROSS-CHECK REFERENCE NUMBER FROM GOOGLE PORTAL ALSO IF INCASE YOU HAVING DOUBT.

SHIPPING: THERE ARE MANY MODES OF SHIPPING METHOD AVALAIBLE. WE TRY OUR BEST THAT OUR CUSTOMERS WILL GET THE PARCEL AS SOON AS PARCEL WITHOUT ANY DELAY.

BUT SOMETIME IF DELAY IN PARCEL DUE TO THIRD PARTY, SOME THINGS ARE BEYOND OUR CONTROL. SO WE JUST REQUEST YOU TO PLEASE MESSAGE US & WE TRY TO ESCALATE YOUR QUERY & UPDATE YOU TIME TO TIME & TRY TO GET YOUR THE PARCEL DELIVERED TO YOU. ALL ITEMS ARE OF FREE SHIPPING. IF YOU WANT QUICKEST DELIVERY THEN PLEASE MESSAGE US TO PROVIDE ALTERNATE SHIPPING METHOD WITH ADDITIONAL COST.

TAXES: OUR PRICE IS INCULDED FREE SHIPPING & PRODUCT COST. ANY KIND OF VAT, GOVERNMENT TAXES OR IMPORT DUTY IS NOT CHARGED BY US. IF ANY IMPORT CHARGES, PLEASE CHECK YOUR COUNTRY RULES & REGULATIONS. IMPORT CHARGES ARE VERY NOMINAL BUT SOMETIMES IT VARY FROM ITEM TO ITEM & COUNTRY TO COUNTRY.

🔧 Kubota 87mm STD Piston Kit – Complete with Pin & Rings