BMC Air Filter FM783/08 for Royal Enfield Bullet 350 & Thunderbird 350 (Old Models) – Washable High-Flow Cotton Gauze Replacement

The BMC FM783/08 is a premium washable, reusable, pre-oiled cotton gauze air filter designed as a direct replacement that installs in your bike’s original airbox (no modification required). BMC states it is built to deliver higher airflow while maintaining efficient filtration, with claimed particle containment down to 7 microns (vs typical OEM paper around 10 microns). 

Unlike many competitor pages that broadly label this as “Classic 350 / 350 Generic”, we are keeping this listing strictly verified to the official BMC application list to reduce wrong orders and returns. As per BMC, FM783/08 is intended for select older Royal Enfield models (Bullet/Thunderbird/Electra X/Sixty 5) in specific year ranges (see the compatibility table). 

What this is: Genuine BMC performance replacement air filter (aftermarket).
What this is not: Not confirmed for Classic 350 UCE (2009+), Classic 350 Reborn/J-Series, 650 Twins, Himalayan/Scram, etc. (explicit exclusions below).

Fitment check available on WhatsApp—share your bike model + year (and an airbox photo if possible) before ordering if you are unsure.

Key Features 

• Part Number: FM783/08

• Filter type: Cylindrical “replacement air filter” (stock airbox fitment) 

• Filter media: Oiled Cotton Gauze 

• Washable / reusable: Yes (regenerate using BMC cleaning kit) 

• Pre-oiled from factory: Ready to install 

• Filtration claim: captures impurities down to 7 microns (BMC claim) 

• Construction: “Full Moulding” one-piece mould (no welded joints) 

• EAN / Barcode (authenticity): 8055732591748 

• Box info (helps shipping planning): Gross weight 0.3 kg (BMC) 

Best for:

• Restorations + well-maintained older Bullets/Thunderbirds

• Touring (serviceable filter, long usable life)

• Riders wanting a premium intake upgrade without airbox modification

Compatibility Table (Model | Fitment | Notes)

Explicit Exclusions 

• Not confirmed / NOT listed by BMC for FM783/08: Classic 350 UCE (2009–2021), Classic 350 Reborn/J-Series, Bullet 350 J-Series, Meteor 350, Hunter 350, Interceptor 650 / GT 650, Himalayan / Scram.

• PLEASE CHECK PART NUMBER AND PHOTO BEFORE PURCHASE 

Variants 

• This listing is for: BMC FM783/08 (Standard cotton filter). 

• BMC mentions it offers “Standard” and “Race” versions for some motorcycle applications; if you specifically want a Race version for your bike, message us and we’ll verify availability and correct part mapping before you order. 

What’s in the Box

• 1 × BMC Air Filter FM783/08

Installation Notes (tools/fitment notes + warnings)

Typical tools: screwdriver + basic socket/Allen set (varies by your airbox/side panel).

Install steps (recommended):

1. Open the airbox carefully; avoid dropping dust into the intake tract.

2. Clean the airbox sealing surface.

3. Seat the filter evenly—ensure full seal all around.

4. Close airbox; tighten evenly.

Warnings / service:

• BMC confirms all filters are pre-oiled and can be washed & regenerated using the correct BMC regeneration kit. 

• Do not over-oil after cleaning (can restrict airflow).

• If your bike is not exactly in the compatibility list, ❓Verify fitment before ordering (WhatsApp check available).

FAQs 

Q1. Which bikes does BMC FM783/08 fit officially?
BMC lists FM783/08 for: Bullet 350 (Export 1998–2007), Bullet 350 (India 2004–2007), Bullet 500 (Export 1998–2007), Bullet 500 (India 2004–2007), Electra X 500 (2004–2008), Sixty 5 500 (2002–2006), Thunderbird 350 (2003–2008). 

Q2. Does FM783/08 fit Classic 350 UCE (2009–2021)?
Not confirmed. The official BMC FM783/08 compatibility list does not mention Classic 350 UCE (2009+). Please ❓Verify fitment before ordering on WhatsApp. 

Q3. Many websites say “Classic 350 / 350 Generic”. Why are you not claiming that?
Because we follow the official BMC model-year list to reduce wrong orders and returns. Some sellers use broad naming even when official application mapping is narrower. 

Q4. Is this an OEM (Royal Enfield) part?
No—this is a genuine BMC aftermarket performance air filter (not Royal Enfield-branded OEM). 

Q5. Is FM783/08 washable and reusable?
Yes. BMC states Lavabile (Washable): Yes and it can be regenerated. 

Q6. Is it pre-oiled or do I need to oil it before installing?
BMC states all BMC air filters are pre-oiled. 

Q7. What is included in the box?
BMC lists “1 Air Filter” as the box content. 

Q8. How do I confirm authenticity?
Check the part number FM783/08 and the EAN 8055732591748 on packaging/label where applicable.

Q9. Do I need tuning / rejetting / remap after installing this filter?
Usually not for a stock bike, but older carb setups vary. If you already have a free-flow exhaust or intake mods, fine-tuning may help. Start with correct fitment and a clean seal first.

Q10. What if I order the wrong filter?
Air filters are fitment-sensitive. Use our WhatsApp fitment check (model + year + airbox photo) before ordering to avoid mismatch.