The facts.
| Part number | G9131 |
|---|---|
| Type | Bent pipe |
| Material | AISI 304 stainless steel |
| Spark weight | 0.2 kg |
| Dimensions | 90°, Ø 35 × 1.0 mm |
| Fitment | Universal |
| Road approval | None — track use only |
| Origin | Made in Italy |
| Manufacturer | Spark Exhaust Technology, Mantova |
| Manufacturer description | Bended tube 90° - d.35 x 1,0mm |
DescriptionThe whole story▼
Fünfunddreißig Millimeter bei neunzig Grad. Die enge Ecke in einem Kleintwin-Durchmesser — das Teil, das einen Auspuff unter dem Kurbelgehäuse hindurch und auf der anderen Seite wieder heraus bringt.
Key Features
- Dorngeformter 90°-Bogen, Edelstahl AISI 304.
- Ø 35 mm außen, 1,0 mm Wandstärke.
- Gerade Enden an beiden Seiten.
- Passt zu Sparks 35-mm-Geraderohr, Artikel G9011.
- Spark-Artikelnummer G9131, gefertigt in Mantova, Italien.
Unter dem Motor
An einem kleinen Twin oder Einzylinder fällt der Auspuff vom Kopf ab, dreht unter dem Kurbelgehäuse nach hinten und steigt zum Schalldämpfer wieder an. Die erste dieser Wenden liegt nahe am rechten Winkel und passiert im engsten Raum, den die Anlage hat.
Die Bodenfreiheit entscheidet, wie eng es wird. Messen Sie mit eingefederter Federung und einem Fahrer auf der Maschine, nicht auf dem Montageständer.
Ablösung an der Innenseite
Gas, das um eine scharfe Ecke geht, kann der Innenwand nicht folgen. Es löst sich ab, hinterlässt dahinter ein langsam zirkulierendes Gebiet und verengt das Rohr faktisch. Daher kommt der Verlust in einem rechten Winkel — nicht vom Richtungswechsel selbst.
Ein größerer Radius verringert ihn, und ein gerader Abschnitt danach lässt die Strömung wieder anliegen.
Magnete helfen nicht
Austenitischer Edelstahl ist unmagnetisch — die magnetischen Spannklötze und Winkel, die Baustahl beim Heften halten, sind hier nutzlos. Aufbau heißt Zwingen, Prismenblöcke, Klebeband und eine ebene Fläche. Gut, das vor der ersten Verbindung zu wissen und nicht währenddessen.
Einen Neunziger halbieren
Am Scheitel geschnitten wird aus einem rechten Winkel ein Paar Fünfundvierziger, jeder mit einem geraden Ende und einem frischen Schnitt. Es ist der Grund, warum der schärfere Winkel der sicherere ist, den man auf Lager legt: Die Säge arbeitet nur in eine Richtung.
Nach dem Schweißen
Beizpaste auf der Außenseite der Naht entfernt das wärmebeeinflusste Oxid und stellt die Passivschicht wieder her. Das ist nicht kosmetisch — der verfärbte Streifen neben einer Naht ist chromverarmt, und dort beginnt eine Edelstahlanlage zu korrodieren.
Bestellen
Ein Bogen je Artikel. In diesem Durchmesser als 30°, 45° und 90° erhältlich.
FitmentWhich bikes this fits▼
Universalprodukt — Bitte prüfen Sie, ob es an Ihr Bike passt.
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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.
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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.
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