Spark Exhaust Exhaust Spring 83 mm With Rubber Sleeve Universal MOLLA06
02 · Data & docs

The facts.

Technical data
Part numberMOLLA06
TypeClamp / spring
MaterialStainless steel
FitmentUniversal
Road approvalNone — track use only
Length83 mm
SleeveRubber
OriginMade in Italy
ManufacturerSpark Exhaust Technology, Mantova
Manufacturer descriptionSpring 83mm with rubber
DescriptionThe whole story▼

Eighty-three millimetres, sleeved in rubber. Only marginally more than the bare version, and the difference between a quiet joint and a buzzing one.

Key Features

  • Exhaust spring, 83 mm, with a rubber sleeve.
  • The longer of Spark's two spring lengths.
  • Spark part number MOLLA06, made in Mantova, Italy.

What the Rubber Does

A bare spring under tension against a hot pipe resonates. At idle it produces a metallic buzz that sounds like something loose, and on a quiet machine it is the noise the owner keeps chasing.

The sleeve damps it. That is the whole function, and it is worth having on any motorcycle that is ridden on the road.

Where It Does Not Belong

Immediately downstream of a collector, where the temperature is highest. Rubber has a limit, and a sleeve that has cooked leaves a residue on the pipe and stops damping anything.

Bare springs for the hot end, sleeved for everything after it, is the usual arrangement.

Two Per Joint

Opposing sides, both the same. Mixing a sleeved spring with a bare one on the same joint gives unequal tension and lets the joint sit crooked.

The Shorter Version

MOLLA07 is the 63 mm spring with the same sleeve, for joints where the hooks sit closer together.

FitmentWhich bikes this fits▼

Universal product — Please check whether it fits your bike.

07 · Support

Questions, one topic at a time.

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08 · Paddock

Before you go.

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