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Full porting service (ports reshaped, runners modified)

IJSBA · Engine

Full porting service (ports reshaped, runners modified)

A service SKU, but it lives or dies by class exactly like a part.

Where it stands, class by class

20 classes, grouped by the answer rather than listed one by one, because an answer that holds for a class usually holds for every class that borrows its rules.

Not legal 1 class

Only the 1.00mm / 30-degree chamfer. Abrasive port cleaning is prohibited.

Not legal 1 class

Original port timing must be retained. Chamfer only.

Not legal 1 class

Cylinder port modification beyond the 1.00mm / 30-degree chamfer is prohibited.

  • Sport Spec · none - this document uses ALL-CAPS section headings, not numbered rules

Not legal 1 class

No chamfering allowance was even returned for SKM. Internal grinding, machining and polishing prohibited.

Legal, within limits 1 class

Two-stroke cylinder modifications require WRITTEN IJSBA APPROVAL. · SPGP.5.5

Legal 1 class

Intake and exhaust ports may be modified in diameter and shape, runners modified or built up, combustion chambers modified. · SKSS.3.2

Legal 1 class

Intake and exhaust ports may be modified; diameters and shapes may be changed. · VSK.3.2

Full porting service (ports reshaped, runners modified): if the rule your class applies reads differently to you, or the rulebook has changed since this was read, ask. We answer with the section we read it from, or that we have not read it. Ask a rules question.

Every IJSBA class · where the rulebooks differ · signed checks on parts the shop sells.

Engine · two and four stroke · legal outright in 9 of 20

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