The facts.
| Part number | G9954 |
|---|---|
| Type | Open, no perforation |
| Material | Stainless steel |
| Dimensions | Ø 40 mm, open, no perforation, straight cut |
| Fitment | Universal |
| Road approval | None — track use only |
| Fits | Spark Force silencers |
| Origin | Made in Italy |
| Manufacturer | Spark Exhaust Technology, Mantova |
| Manufacturer description | FORCE - d.40 00° OPEN |
DescriptionThe whole story▼
Forty millimetres of bore over seventy of length. The wider Force insert, for the larger engines the family gets fitted to.
Key Features
- dB killer for Spark Force silencers.
- 40 mm internal bore, 70 mm long.
- Open type, no perforation.
- Stainless steel, removable.
- Spark part number G9954, made in Mantova, Italy.
Which of the Two
Spark builds the Force insert at 35 mm and at 40. The smaller one goes on the small twins — R3, Ninja 400 — and this one on everything above them. The rule is simple: match the insert to the engine, not to the silencer, because the case is the same in both instances.
If you fit the 35 to a large twin you will feel it in the mid-range. If you fit the 40 to a 400 you will not hear any difference at all.
Seventy Millimetres
Short, as open inserts go. Spark relies on the Force case's own internal volume for most of the work and uses the insert to trim rather than to transform.
That also makes it easy to fit: seventy millimetres needs very little clear length behind the outlet.
A Replacement Part in Practice
Most Force silencers leave Spark with an insert already in them. The reason to buy this article is that one went missing — during a rebuild, in a previous owner's garage, or on the road, because an insert that was refitted carelessly can work its way out.
A small part against a silencer that is otherwise unusable on a road ride is not a difficult calculation.
Fitting It Properly
The retaining screw does the work. It should be tightened properly and checked after the first heat cycle, because an insert that vibrates loose in a titanium case will mark the bore on its way out.
Forty Millimetres of Bore
On a Force case fitted to anything from a middleweight upward, forty is the figure that leaves the engine alone. It narrows the exit enough to take the top off the note and not enough to show up anywhere on a dyno chart.
Approval
Unaffected. Where the Force silencer is homologated, the supplied insert is part of the approved configuration; where it is a racing article, no plug changes that.
FitmentWhich bikes this fits▼
Universal product — Please check whether it fits your bike.
Questions, one topic at a time.
Get the real shipping cost for this item to your address — the same rates as checkout.
Choose a destination and hit Estimate — we fetch the live rates for this item.
We’re based in Germany. Standard delivery goes by DHL and national postal services and takes about 2–5 days within Germany, 1–2 weeks within the EU and 2–6 weeks outside the EU. Need it sooner? Express delivery reaches most of the world within a few days — just choose it at checkout where available.
Your exact shipping cost is calculated by destination and weight and shown at checkout before you pay — no hidden fees. Express delivery is selectable at checkout where available.
Yes, we ship to over 130 countries. Prices, taxes and delivery times for your destination are calculated automatically at checkout.
Within the EU, no — our prices already include all duties and EU VAT. For deliveries outside the EU (e.g. Switzerland, the UK or the USA), your order may be subject to import duties and taxes set by your country. These are collected by the carrier when your parcel arrives, aren’t included in our prices, and are outside our control.
As soon as your parcel ships we email you a tracking link, so you can follow it all the way to your door.
On out-of-stock items you can request a delivery time or leave your email to be notified the moment it returns — just use the notification box on the product.
You have the right to cancel within 14 days of receiving your order. Register your return by email first; once it’s approved you have a further 14 days to send the goods back. Items should be unused and in their original packaging.
Register your return by email with your order number before sending anything back, and we’ll send you the return instructions. Please note: returns that aren’t registered in advance can’t be accepted.
The quickest way is to place a new order for the size you need and register a return for the original by email — just let us know it’s an exchange.
We’re sorry — that shouldn’t happen. Contact us with your order number and a photo as soon as you can, and we’ll arrange a replacement or refund right away. Faulty goods are always covered by your statutory warranty.
Refunds go back to your original payment method, usually within 3–5 working days of your return reaching our warehouse.
PayPal, all major credit and debit cards (Visa, Mastercard, American Express), Klarna (pay later and instalments), Apple Pay, Google Pay and more — all processed securely via PayPal and Mollie.
Yes. Choose Klarna at checkout to split your purchase into flexible monthly installments.
Your payment is taken when you place your order. If you choose Klarna, you pay later according to Klarna’s terms.
Every payment runs over an SSL-encrypted connection through certified providers. We never see or store your full card details.
If your order hasn’t shipped yet, contact us as soon as possible and we’ll do our best to change or cancel it.
No — you can check out as a guest. An account simply lets you track orders and reorder faster.
For customers in the EU, prices are shown including your country’s local VAT. For customers outside the EU, prices are shown without VAT — instead, your country’s import taxes and duties may apply on delivery (see the customs question).
Yes. Your invoice is attached to your order confirmation email and is also available in your account.
Yes. We’re an authorised dealer, so every product is 100% original and comes with the full manufacturer warranty.
Yes. Everything we sell is genuine and comes with the manufacturer’s warranty, on top of your statutory rights. Keep your invoice as proof of purchase and contact us if you ever need to make a claim — we’ll help you through it.
Our team is happy to help. Use the contact button below and we’ll personally help you choose the right gear or part.
Measure your head circumference about one centimetre above your eyebrows and compare it with the size chart on this page. Between sizes? Choose the smaller one — the padding beds in with use.
Yes — it’s tested and approved to the current ECE 22.06 standard and road-legal across the EU.
Most of our touring and sport helmets are Pinlock-ready and many include the insert. Check the ‘What’s in the box’ section on this page for this model.
Yes — the cheek pads are channelled so the arms of your glasses slide in comfortably.
Take out the washable lining and hand-wash it in lukewarm water. Clean the shell and visor with a soft cloth and water only — never solvents.
Our team will personally help you choose the right gear or part — around 24h for a reply.