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- USA
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Ships within 48 hours · Estimated delivery Jul 10 - Jul 15
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Description
Piston Set by JE - 77.25mm +.25mm Oversize Bore | 8.3:1 CR | Stroke 85.8mm - MINI Cooper S 2002-2008NOTE: Image shown not actual parts. JE Pistons is the leader in forged racing pistons. With 70 plus years of experience, in house forging, and industry leading technology, JE Pistons are designed to perform at the top levels of all forms of motorsports. Bore (in) 3. 041 Bore (mm) 77. 249 Top Compression Ring Thickness 0. 0480 Second Compression Ring Thickness 0. 0480 Oil Ring Thickness 0. 141 Forging Type Round Volume (cc) 1. 00 Series JE Pistons
NOTE: Image shown not actual parts.JE Pistons is the leader in forged racing pistons. With 70-plus years of experience, in-house forging, and industry-leading technology, JE Pistons are designed to perform at the top levels of all forms of motorsports.
Bore (in) 3.041
Bore (mm) 77.249
Top Compression Ring Thickness 0.0480
Second Compression Ring Thickness 0.0480
Oil Ring Thickness 0.141
Forging Type Round
Volume (cc) -1.00
Series JE Pistons
Piston Head Type Inv Dome/Dish
Pin Diameter (IN) 0.827
Compression Height 1.043
Make MINI
Wrist Pin Style - floating or press fit Floating
Wall Type CHAMFERED
Wall Thickness (IN) 0.150
Ringset Part Number JG0004-3051
Ring Brand ProSeal
Ringset Included Yes
Retainer Thickness 0.063
Retainer Lock Style Wire Lock
Retainer Lock Part Number 827-063-MW
Retainer Diameter (IN) 0.827
Replacement Single Piston 312424S
Piston Pin Inside Diameter 0.527
Piston Pin Material 5115 LOW CARBON STEEL, CASE HARDENED
Piston Material 2618
Piston Pin Length (IN) 2.250
Piston Avg Wt 241
Pin Offset No
Pin Brand JE Pistons
Pin Part Number 827-2250-15-51C
Pin Included Yes
Pin Diameter (mm) 21.00
Oil Rail Support Part Number (If Required) 3040-122
Oil Rail Support Included Yes
Oil Rail Radial Wall 0.122
Deck Clearance -0.110
Brand JE Pistons
OE Part # for standard sized piston:
11-25-7-520-131 / 11 25 7 520 131 / 11257520131
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.5 ★★★★★
Based on 2306 reviews
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Product Reviews
★★★★★ 5
They’re fantastic!!!!
Size: X-Large, Color: Multicoloured E-(5-pack)
My clothing size is 16/18 and XL. Even though Amazon suggested a size XXL, I ordered my normal XL and they fit perfectly.
The fabric for this style is 92% bamboo viscose and is amazingly soft and almost silky feeling. I had ordered a different boy short in this brand but they were 80% bamboo viscose and the fabric was significantly heavier. I returned those and ordered these.
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Reviewed in the United States on April 25, 2026
★★★★★ 5
Genuinely comfortable and practical for everyday wear
Color: A-5pack, Size: Large, Color: A-5pack, Size: Large
I am very impressed with the FINETOO Boyshort Underwear for Women. These are extremely comfortable, even after wearing them all day. The cotton material is soft, breathable, and feels great against the skin without causing irritation.
The cut is well designed and offers full coverage that stays in place without riding up. They are very wearable for everyday use, whether lounging, working, or running errands. I also appreciate that they do not create noticeable panty lines, which makes them easy to wear under different types of clothing, including leggings and jeans.
Durability has been excellent so far. I have washed them multiple times, and they have not shown any signs of wear, stretching, or fading. The stitching has held up well, and the fabric still feels just as comfortable as when they were new.
The color variety in the pack is another plus. The colors are cute, practical, and easy to mix into a regular underwear rotation.
Overall, these boyshorts check all the boxes for comfort, durability, and everyday wearability. I would definitely recommend them to anyone looking for reliable, full coverage cotton underwear.
A few are missing from my screenshot as I had already worn them!
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Reviewed in the United States on December 30, 2025
★★★★★ 5
Made with quality
Color: A-5pack, Size: Small
I ordered a pack of these sometime last year and they have lasted. They r made with quality stitching & the material isnt smothering. These ain’t gonna make your cat stank on a hot day, they r breathable. Sorry didn’t know how else to get that point across. But I just ordered 2 more packs. They r aslo comfortable and don’t feel tight, smothering, or itchy. The material is very comfortable against my skin. The tag is on the left, so when u hold them up u can tell which side is the front and back. They cover enough & form to your body so they r also cute and flattering. They do leave some cheek exposed, for me anyway. These also don’t bunch up & cause wedgies. They stay in place. I have a physical job so I move around a lot, & clean house a lot, & these don’t move around at all. Small fits me perfectly & they do stretch. I’m petite but curvy. I wear cotton leggings & layers frequently, for my job in a cold room, and you can’t c these panty lines thru the cotton leggings. These r also kinda low cut, and they sit below my belly button. These ain’t gonna hold in a fupa or anything, but they do compliment natural curves. I’d leave a pic but not for free 😉
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Reviewed in the United States on September 21, 2025
★★★★★ 5
Underwear for sensitive, soft and comfortable skin
Color: A-5pack, Size: Small, Color: A-5pack, Size: Small
I really like them for their soft fabric and comfort, I washed them and I thought they were going to get bigger, but they were left intact, they are made with cotton I am of sensitive skin and it worked for. I asked for others of the same brand, but they are different style, they are beautiful they are not rolled up. size S.
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Reviewed in the United States on May 25, 2026
★★★★★ 4
Good value
Color: C-5pack, Size: Large
These are good panties for the price but I don't love that they don't have a tag or something printed to know which is the back and front. You can tell once you put them on but that's a bit annoying when you get it wrong. Not a super big deal though. They are comfortable and pretty true to size. They look just as pictured. Definitely worth the price that I paid and I would buy them again. Very lightweight and comfortable
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Reviewed in the United States on December 26, 2025
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