| Process | Unit | Price | Comment |
|---|---|---|---|
| Bottom Surface Decking | |||
| Single cylinder Up to 1.0mm (minimal cut) |
One | 7,000 | Multi-cylinder engines with individual heads for each cylinder fall under single cylinder category. (3 cylinder engine will be single cylinder cost x3) |
| Single cylinder More than 1.0mm |
One | 8,000 | |
| Two cylinders Up to 1.0mm (minimal cut) |
One | 8,000 | Improves seal, adjusts compression, and prevents leaking of lubricating oil and coolant.
Please contact us if you would like the surface grinding amount to exceed 1.0 mm. |
| Two cylinders More than 1.0mm |
One | 10,000 | |
| Three cylinders Up to 1.0mm (minimal cut) |
One | 9,500 | |
| Three cylinders More than 1.0mm |
One | 12,500 | |
| Four cylinders Up to 1.0mm (minimal cut) |
One | 12,000 | |
| Four cylinders More than 1.0mm |
One | 15,000 | |
| Combustion chamber volume measurement One cylinder |
One | 3,000 | Liquid volume measurement using a burette. |
| Valve guide production (copper material) |
One | 4,000 ~ | Produce guides to the same shape as the original. |
| Valve guide production (copper material) (shape change) |
One | 5,000 ~ | |
| Valve guide replacement | One Section |
1,000 | |
| Valve guide inner diameter reaming | One Section |
500 | |
| Valve guide pilot hole boring | One Section |
7,000 ~ | Repair work when the pilot hole on the head side is damaged. The inner diameter is expanded. |
| Seat ring production (iron material) |
One Piece |
2,300 ~ | Manufactured using cast iron and heat-resistant steel. |
| Seat ring production (BeCu material) |
One Piece |
4,300 ~ | |
| Seat ring replacement (same diameter size) |
One Section |
3,000 | |
| Seat ring replacement (oversize) |
One Section |
4,500 ~ | |
| Valve face polishing | One | 850 | |
| Seat cut (standard) |
One Section |
2,000 | |
| Seat cut (special shape) |
One Section |
3,000 ~ | For special seat shapes (DUCATI, Harley Davidson, etc.) |
| Valve lapping | One | 650 | |
| Twin plug processing | One Cylinder |
15,000 ~ | Kawasaki’s Z series, Harley Davidson, etc. |
| Screw hole correction helisert processing (normal) | One Section |
3,000 ~ | All millimeter sizes are supported. Please contact us for inch sizes. |
| Plug screw hole correction helisert processing (special) | One Section |
10,000 ~ | Supports sizes from M8 to M14. |
| Bolt hole correction via sleeve insertion | One Section |
8,000 ~ | For severe damage that cannot be resolved with helisert. Most of the sleeves created are aluminum. |
| Process | Bore Diameter |
Unit | Price | Comment |
|---|---|---|---|---|
| Cylinder Boring Honing | ||||
| ~ φ2.00mm (Base) | ~ φ60 | One Cylinder |
7,500 | Compatible with cast iron bores. Please contact us for plated cylinders. |
| ~ φ2.00mm (Base) | over φ60 ~ 80 |
One Cylinder |
8,000 | |
| ~ φ2.00mm (Base) | over φ80 ~ 100 |
One Cylinder |
10,000 | |
| ~ φ2.00mm (Base) | Over φ100 |
One Cylinder |
Estimated Each Time |
|
| Over φ2.00 mm ~ 3.00 mm | Uniform | One Cylinder |
Base + 1,500 | |
| Over φ3.00mm | Uniform | One Cylinder |
Base + 3,000 | |
| Torque plate fastening (additional charge) |
Uniform | One Cylinder |
4,000 | For Harley Davidson etc. |
| Sleeve replacement boring honing (same diameter) |
Added to the above (Base) prices | One Cylinder |
Base + 3,000 | Replace sleeves with the same outer diameter as original. |
| Sleeve replacement boring honing (oversize) |
Added to the above (Base) prices | One Cylinder |
Base + 7,000 | Including oversized counterbore on the cylinder. |
| Cast iron sleeve separately manufactured | Up to about φ100 mm |
One Cylinder |
20,000 | Since the material unit price is changed, it will be the market price. |
| Sleeve retaining lock screw processing | Uniform | One Cylinder |
3,500 | It is applied when the sleeve turns during boring. |
| Cylinder top surface decking (minimal cut) |
Uniform | One Cylinder |
4,500 | For surface facing cylinders and sleeves. |
| Cylinder top surface decking (specified amount) |
Uniform | One Cylinder |
6,000 | |
| Process | Unit | Single Cylinder |
Straight 2-Cylinder |
Straight 4-Cylinder |
Comment |
|---|---|---|---|---|---|
| Crankcase boring | One | 10,000 ~ | 12,000 ~ | 24,000 ~ | When using an oversized cylinder |
| Crankcase top surface decking | One | 8,000 ~ | 12,000 ~ | 18,000 ~ | One stud bolt removal is from ¥1,000 |
| Process | Single Cylinder | 2-Cylinder | 3-Cylinder | 4-Cylinder | Comment |
|---|---|---|---|---|---|
| Crankshaft assembly O / H (approximate price) |
20,000 ~ | 38,000 ~ | 60,000 ~ | 72,000 ~ | Please supply the parts. Estimate separate for Harley etc. |
| Crankshaft assembly centering only | 8,000 | 17,000 | 30,000 | 36,000 | |
| Integrated crankshaft straightening | – | 8,000 | 10,000 | 10,000 | Bend correction. Finished within 1/100 of the runout value. Required for dynamic balancing. |
| Integrated crankshaft lightening Per cylinder |
8,000 ~ | 8,000 ~ | 8,000 ~ | 8,000 ~ | Lightweight work using a lathe. Dynamic balancing is essential after processing. |
| Magnet rotor lathe lightening process Per cylinder |
10,000 ~ | 10,000 ~ | 10,000 ~ | 10,000 ~ | Dynamic balancing is essential after lightweight processing. |
| Process | 1-3 Cylinder | 4-Cylinder | Comment |
|---|---|---|---|
| Integrated crankshaft (normal crank) |
Dummy weight required
Separate quote |
15,000 ~ | We perform dynamic balance that exceeds the genuine standard. |
| Integrated crankshaft (processed crank) |
Dummy weight required
Separate quote |
23,000 ~ | It is indispensable when lightening. |
| Magnet rotor | 8,000 ~ | 8,000 ~ | Some of the genuine products are not dynamically balanced, so the effect is superb. |
![[NAPREC-ナプレック]エンジン・パーツ・チューニング・金属加工・内燃機加工](https://www.naprec.co.jp/docs/wp-content/themes/naprec/images/logo.png)



