{"id":237295,"date":"2025-11-03T11:52:58","date_gmt":"2025-11-03T11:52:58","guid":{"rendered":"https:\/\/innteck.it\/innteck-usa\/?post_type=product&p=237295"},"modified":"2026-10-06T07:14:06","modified_gmt":"2026-10-06T07:14:06","slug":"vhm-high-compression-cylinder-head-insert-for-yamaha-yz125-fantic-xx125-11-20cc","status":"publish","type":"product","link":"https:\/\/innteck.it\/innteck-usa\/product\/motorcycle\/engine\/cylinder-parts\/cylinder-head-inserts\/vhm-high-compression-cylinder-head-insert-for-yamaha-yz125-fantic-xx125-11-20cc\/","title":{"rendered":"VHM High-Compression Cylinder Head Insert for Yamaha YZ125 & Fantic XX125 \u2013 11.20cc"},"content":{"rendered":"

The VHM AE32327-E 11.20cc cylinder head insert<\/strong> is a higher-compression combustion chamber option developed for Yamaha YZ125 and Fantic XX125 2-stroke motorcycles equipped with the VHM AA33203 cylinder head.<\/p>\n

Compared with a larger-volume VHM insert, its reduced 11.20cc combustion chamber volume<\/strong> increases the compression ratio, shifting the engine character toward stronger low- and mid-range torque. The result is improved acceleration, more immediate throttle response, and a stronger torque sensation when driving out of corners.<\/p>\n

This setup is particularly suited to riders who prioritize corner-exit performance and usable torque over maximum top-speed potential. As with other higher-compression configurations, the increased low- and mid-range response comes with a trade-off in peak top-end performance.<\/p>\n

The insert features a -0.10 mm piston height specification<\/strong>, 1.00 mm squish<\/strong>, a 12\u00b0 flat-top piston crown profile<\/strong>, and a \u00d854 mm bore<\/strong>. It is precision-designed to fit the VHM AA33203 cylinder head and can be changed quickly, allowing the engine setup to be adapted for different fuels, track surfaces, elevations, and riding conditions.<\/p>\n

When the VHM cylinder head is used together with a VHM CDI<\/strong>, including CD020422 or CD020426, the dedicated secondary insert chart should be used to determine the correct combustion chamber setup.<\/p>\n

The insert also features an engraved part-number reference for easy identification during servicing and engine tuning.<\/p>\n

This insert is not compatible with the OEM cylinder head and must be used with the VHM AA33203 cylinder head.<\/strong><\/p>\n

<\/h3>\n

Key Features<\/h3>\n
    \n
  • 11.20cc higher-compression combustion chamber increases low- and mid-range torque<\/strong><\/li>\n
  • Improves acceleration and delivers stronger engine response when exiting corners<\/strong><\/li>\n
  • Quick-change VHM insert design allows fast adjustment of engine characteristics<\/strong><\/li>\n
  • Designed for setup selection based on fuel, track conditions, elevation, and ignition configuration<\/strong><\/li>\n
  • Precision engineered exclusively for use with the VHM AA33203 cylinder head<\/strong><\/li>\n<\/ul>\n

    <\/h3>\n

    Technical Specifications<\/h3>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    Specification<\/th>\nDetails<\/th>\n<\/tr>\n
    Manufacturer<\/strong><\/td>\nVHM<\/td>\n<\/tr>\n
    Part Number \/ SKU<\/strong><\/td>\nAE32327-E<\/td>\n<\/tr>\n
    Product Type<\/strong><\/td>\nCylinder Head Insert \/ Combustion Chamber Insert<\/td>\n<\/tr>\n
    Insert Type<\/strong><\/td>\nOptional \/ High-Compression Configuration<\/td>\n<\/tr>\n
    Engine Type<\/strong><\/td>\n2-Stroke<\/td>\n<\/tr>\n
    Engine Class<\/strong><\/td>\n125cc<\/td>\n<\/tr>\n
    Combustion Chamber Volume<\/strong><\/td>\n11.20 cc<\/td>\n<\/tr>\n
    Piston Height<\/strong><\/td>\n-0.10 mm<\/td>\n<\/tr>\n
    Squish<\/strong><\/td>\n1.00 mm<\/td>\n<\/tr>\n
    Piston Crown Shape<\/strong><\/td>\nFlat Top 12\u00b0<\/td>\n<\/tr>\n
    Bore<\/strong><\/td>\n\u00d854 mm<\/td>\n<\/tr>\n
    Power Characteristic<\/strong><\/td>\nIncreased Low- and Mid-Range Torque<\/td>\n<\/tr>\n
    Required Cylinder Head<\/strong><\/td>\nVHM AA33203<\/td>\n<\/tr>\n
    Compatible VHM CDI<\/strong><\/td>\nCD020422 \/ CD020426<\/td>\n<\/tr>\n
    OEM Cylinder Head Compatible<\/strong><\/td>\nNo<\/td>\n<\/tr>\n
    Identification<\/strong><\/td>\nPart-number reference engraved on insert<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

    11.20cc VHM cylinder head insert designed to increase compression and deliver stronger low- and mid-range torque on Yamaha YZ125 and Fantic XX125 2-stroke engines. Ideal for riders looking for improved acceleration and stronger drive out of corners.<\/p>\n","protected":false},"featured_media":237294,"template":"","meta":[],"product_brand":[269],"product_cat":[235],"product_tag":[],"class_list":["post-237295","product","type-product","status-publish","has-post-thumbnail","product_brand-vhm","product_cat-cylinder-head-inserts","first","instock","taxable","shipping-taxable","purchasable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/innteck.it\/innteck-usa\/wp-json\/wp\/v2\/product\/237295","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innteck.it\/innteck-usa\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/innteck.it\/innteck-usa\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/innteck.it\/innteck-usa\/wp-json\/wp\/v2\/media\/237294"}],"wp:attachment":[{"href":"https:\/\/innteck.it\/innteck-usa\/wp-json\/wp\/v2\/media?parent=237295"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/innteck.it\/innteck-usa\/wp-json\/wp\/v2\/product_brand?post=237295"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/innteck.it\/innteck-usa\/wp-json\/wp\/v2\/product_cat?post=237295"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/innteck.it\/innteck-usa\/wp-json\/wp\/v2\/product_tag?post=237295"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}