90508-29M12-00 Yamaha Torsion Spring | Genuine Used Part

🔧 Product Description

Genuine Yamaha Magneto / Throttle Linkage Torsion Spring - Part Number: 90508-29M12-00

A genuine Yamaha torsion spring used within the magneto-control and throttle-linkage system of selected 115HP to 200HP two-stroke outboards.

The spring applies return or preload force to the control lever so the ignition-advance and throttle linkage follows the cam correctly.

⚙️ Key Features

• Genuine Yamaha torsion spring
• Correct part number 90508-29M12-00
• Used in magneto-control and accelerator linkage
• Factory leg angles and spring rate
• Suitable for selected V4 and V6 two-strokes
• Maintains linkage contact and return action

🚤 Compatibility

Documented on selected

• Yamaha 115HP V4 two-stroke outboards
• Yamaha C115 commercial outboards
• Yamaha 130HP V4 two-stroke applications using the related linkage
• Yamaha 150HP V6 two-strokes
• Yamaha 175HP V6 two-strokes
• Yamaha 200HP V6 two-strokes
• 1987 115ETLH
• 1989 150ETXF
• 1993 C115TLRR
• 1998 115TJRW
• Engine Type: Yamaha carburetted V4 or V6 two-stroke outboard
• Fitment Requirement: Confirm spring position and linkage diagram

🔌 Function

The spring preloads the magneto or accelerator lever and returns it against the cam or stop. Correct tension helps synchronise ignition timing with throttle opening.

⚠️ Common Signs of Failure

• Linkage does not return fully
• Ignition timing advances or retards inconsistently
• Spring is broken, stretched or corroded
• Throttle movement feels loose
• Spring legs no longer seat in their locating holes

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 90508-29M12-00 current documented torsion-spring reference
• No direct supersession confirmed

OEM / Related Numbers

• 90508-29M12-00
• 6E5-41636-01-00 related magneto-control rod
• 6G5-41636-01-00 related V6 magneto-control rod
• 90501-16M12-00 related compression spring
• 90201-08M13-00 related washer
• 6H1-41237-00-00 related link joint
• 6E5-41213-00-00 related accelerator cam

Aftermarket / Verified Equivalents

• Specialist used or new-old-stock Yamaha torsion spring
• Generic torsion spring only when wire diameter, coil diameter, leg angles and torque exactly match
• Used complete Yamaha magneto-control linkage
• No verified direct branded aftermarket equivalent

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated
• Compare spring shape and tension before reuse