The facts.
| Part number | G9151 |
|---|---|
| Type | Bent pipe |
| Material | AISI 304 stainless steel |
| Spark weight | 0.2 kg |
| Dimensions | 45°, Ø 52 × 1.0 mm |
| Fitment | Universal |
| Road approval | None — track use only |
| Origin | Made in Italy |
| Manufacturer | Spark Exhaust Technology, Mantova |
| Manufacturer description | Bended tube 45° - d.52 x 1,0mm |
DescriptionThe whole story▼
Fifty-two millimetres at forty-five degrees. The working angle in the one diameter Spark makes that is designed to have another pipe pushed into it.
Key Features
- Mandrel-formed 45° bend, AISI 304 stainless steel.
- Ø 52 mm outside, 1.0 mm wall thickness.
- Fifty millimetre bore.
- Matches Spark's 52 mm straight tube, article G9013.
- Spark part number G9151, made in Mantova, Italy.
Building a Compound Without Welding
Two of these with a short 50 mm pipe between them make a right angle with an offset, and neither joint needs a sleeve or a bead. The assembly can be clocked on the motorcycle, taped, ridden with, and only then committed — or never committed at all, if springs are doing the holding.
That is a different way of building an exhaust from cutting and welding, and it suits a project that is still finding its shape.
Where the Angle Fits
Forty-five degrees is the corner most road systems are made of. It clears an obstacle without the flow penalty of a right angle, and it halves with a saw when the run turns out to need less. Between this article and a length of fifty millimetre pipe, most of a serviceable system already exists.
Repairing Rather Than Rebuilding
The practical value of a female corner shows up after the system is finished. A run that fouls under load, a silencer that has to move for a new pannier rack, a joint that has been cut apart for a weld repair — all of them are adjustments rather than rebuilds when the corners come apart.
Retention
Two springs at opposing sides. Spark sells the springs in two lengths, with or without rubber, and the hooks that fit them in stainless or titanium. A band clamp will hold the joint too and will fight the thermal movement the spring is there to allow.
Keeping the Gap Dry
Every slip joint is a crevice, and on a road machine the crevice corrodes before the exposed surface does. Exhaust paste on assembly, and a joint arranged so it drains downward rather than holding water, handles it. Do not seal a joint that has to slide.
Ordering
One bend per article. Spark builds 30°, 45° and 90° at this diameter.
FitmentWhich bikes this fits▼
Universal product — Please check whether it fits your bike.
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