Manganese bronze valve guides to suit Rotax 900ACE DOHC engines. Intake and Exhaust guides are identical on this engine. OD: 9.055mm. ID: 4.965mm. 33.0mm length. Set of 12. Guide design features a stopper for ease of installation. The top of the guide stops 8.3mm from the spring seat surface. Guides use OEM style stem seal.High quality precision machined. Made from our own proprietary Manganese Bronze. All guides need honing after fitment.
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