ProX Piston Kit RR390 15-26 12.5:1
ProX Piston Kit RR390 15-26 12.5:1
The ProX Piston Kit RR390 15-26 12.5:1 from ProX is listed to fit 2 models: Beta RR 390 4T 2020-2026 and Beta RR 390 4T ENDURO 2015-2019. It is part of our engine piston kit range.
- Part numbers: one per option, listed under Specifications
- Size: 87.96 mm, 87.97 mm, 87.98 mm
- Fits Beta: RR 390 4T 2020-2026, RR 390 4T ENDURO 2015-2019
- Category: Engine Parts › Engine Top End › Engine Piston Kit
Specifications
| Brand | ProX |
|---|---|
| Manufacturer part numbers | 01.7365.A, 01.7365.B, 01.7365.C |
Fits these bikes
This ProX part is listed as fitting 2 models. Check your model and year below.
| Make | Model | Years |
|---|---|---|
| Beta | RR 390 4T | 2020-2026 |
| Beta | RR 390 4T ENDURO | 2015-2019 |
Product details
ProX pistons are machined with precision on modern CNC equipment from the same low-expansion, low-friction alloy that every major Japanese engine manufacturer relies on. A ProX Piston Kit is a premium way to replace your original piston, with kits offered for motorcycles, scooters, mopeds, ATVs and personal watercraft, among other machines.
Key features
- Performance coatings: most ProX pistons are coated to perform better. The OEM-style tin coating helps a new piston wear in, while the advanced black skirt coating also helps with wear-in and then cuts friction over time. This specially formulated blend of materials lifts overall performance.
- Nicasil and plated cylinders: made for the latest Nicasil-plated cylinders, with a wide choice of standard sizes plus A, B, C, D and other oversizes.
- Sleeved cylinders: kits come in standard sizes and a range of oversizes up to 2mm. Those extra oversizes let a cylinder be re-bored several times, greatly extending its life.
- Complete kit: ready to fit straight from the box, with all the parts listed below.
What's included
- Piston
- Ring set
- Gudgeon pin
- Circlips
Questions about this part
Will the ProX Piston Kit RR390 15-26 12.5:1 fit my bike?
It is listed for 2 models, including Beta RR 390 4T (2020-2026), Beta RR 390 4T ENDURO (2015-2019). The full list is in the "Fits these bikes" table on this page, and the fit check next to the price tells you straight away for your saved bike.
What is the part number?
Each option has its own manufacturer part number, listed under Specifications on this page. Our stock code is 120025-A.
How much is delivery?
Order before 3pm for same day dispatch. UK Next Day delivery is £7.99, and free on orders of £100 or more. Pre 12:00 (£9.99) and Pre 10:00 (£14.99) upgrades are charged at any order value.
Can I return it?
Yes. You can return it within 30 days of delivery for a refund. You pay the return postage unless the item is faulty, damaged or wrong, in which case we cover it. See our Returns page for how. Returns