{"product_id":"yamaha-gpx338f-gpx433f-snowmobile-service-manual","title":"Yamaha GPX338F \u0026 GPX433F Snowmobile Service Manual","description":"\u003c!--\nYoast SEO:\nFocus keyphrase: Yamaha GPX338F service manual\nSEO title: 1974 Yamaha GPX338F \u0026 GPX433F Snowmobile Service Manual | PDF\nMeta description: Factory 1974 Yamaha GPX338F \u0026 GPX433F snowmobile service manual (66 pages). Engine, clutch, carburetor \u0026 power train teardown, specs \u0026 torque data. Instant PDF download.\nSuggested slug: yamaha-gpx338f-gpx433f-snowmobile-service-manual\n--\u003e\n\u003ch2\u003eYamaha GPX338F \u0026amp; GPX433F Snowmobile Service Manual\u003c\/h2\u003e\n\u003cp\u003eThis service manual is the workshop repair reference for the 1974 Yamaha GPX338F and GPX433F snowmobiles and their two-stroke, parallel-twin, air-cooled engines, running 66 pages of removal, disassembly, cleaning, inspection, assembly, and adjustment procedures. It's a true service manual — component-level teardown and repair across the engine, power train, chassis, and electrical systems — backed by service data, carburetor settings, and tightening-torque specifications. Originally published by Yamaha and delivered here as an instant PDF download you can read on any device or print for the bench.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eConfigurations covered:\u003c\/strong\u003e GPX338F (338 c.c.) · GPX433F (433 c.c.) — both covered together in this manual.\u003c\/p\u003e\n\u003ch3\u003eAbout the Yamaha GPX338F \u0026amp; GPX433F\u003c\/h3\u003e\n\u003cp\u003eThe GPX338F and GPX433F were Yamaha's performance snowmobiles for the 1974 model year — in Yamaha's naming scheme of the era, the \"F\" suffix denotes 1974, succeeded by the GPX338G and GPX433G in 1975. Both are powered by two-stroke, five-port induction, natural air-cooled, aluminum-cylinder parallel-twin engines. The GPX338F displaces 20.62 cu. in. (338 c.c.) with a 2.362 × 2.346 in. bore and stroke, while the GPX433F displaces 26.42 cu. in. (433 c.c.) with a 2.677 × 2.346 in. bore and stroke. Both share a recoil hand starter, \"Autolube\" oil injection, flywheel magneto CDI ignition, a V-belt automatic transmission, and disc brakes.\u003c\/p\u003e\n\u003cp\u003eThe two sleds share a common chassis — a fabricated aluminum and steel frame, molded steel-reinforced rubber drive track, and 12V lighting — differing primarily in engine displacement and carburetion, with the GPX338F running twin Mikuni BN38-34SH diaphragm carburetors and the GPX433F running twin Keihin CDX42-38 units. Because these machines share so much, a single factory service reference covers both, and that combined documentation is exactly what keeps these vintage Yamaha snowmobiles running when parts and manuals get scarce.\u003c\/p\u003e\n\u003ch3\u003eWhat This Manual Covers\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGeneral:\u003c\/strong\u003e Full specifications and service data for both the GPX338F and GPX433F, plus the special tools, gauges, general tools, and standard tools required to service the snowmobile.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine removal:\u003c\/strong\u003e Step-by-step procedure for demounting the engine from the frame, including exhaust chamber, silencer, throttle and choke wire, and carburetor handling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStarter:\u003c\/strong\u003e Recoil hand starter parts breakdown and removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary sheave:\u003c\/strong\u003e Disassembly, cleaning and inspection, assembly, and adjustment of the primary sheave, with special-tool callouts and V-belt wear limits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eC.D.I. magneto:\u003c\/strong\u003e Removal and service of the flywheel magneto CDI ignition.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarburetor:\u003c\/strong\u003e Model-specific disassembly, cleaning and inspection, assembly, installation, and adjustment for both the Mikuni (GPX338F) and Keihin (GPX433F) carburetors, including the accelerator-pump carburetor on the GPX433F.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil pump \u0026amp; engine:\u003c\/strong\u003e Autolube oil pump service and engine disassembly procedures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower train:\u003c\/strong\u003e Secondary sheave removal, inspection, assembly, and adjustment; disc brake service; chain housing; front axle; rear axle; and sliding suspension.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteering (ski) and chassis:\u003c\/strong\u003e Frame, engine mount, oil and fuel, ski, steering, control wires, and shroud.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrical system:\u003c\/strong\u003e Wiring and electrical component service across the CDI ignition and 12V lighting circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTightening torque:\u003c\/strong\u003e Reference torque specifications for fasteners throughout the machine.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy This Manual Matters\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent-level repair, not just operation.\u003c\/strong\u003e This is a workshop service manual — it walks through tearing down and rebuilding the primary and secondary sheaves, carburetors, CDI magneto, oil pump, and engine, which is what you need when a repair goes past routine maintenance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo models in one reference.\u003c\/strong\u003e Both the GPX338F and GPX433F are documented side by side, so the differences in engine, carburetion, jetting, and ignition are spelled out rather than assumed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe reference data the job depends on.\u003c\/strong\u003e Service data, carburetor jet and adjustment settings, spark plug specs, ignition timing, and tightening-torque figures are included, so you can reassemble to spec rather than guess.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo-stroke and clutch-specific procedures.\u003c\/strong\u003e Autolube oil pump stroke settings, V-belt wear limits, and primary\/secondary sheave adjustments are all documented — the details generic guides don't carry.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVintage sleds, scarce documentation.\u003c\/strong\u003e Factory service literature for these early Yamaha GPX snowmobiles is increasingly hard to find — this PDF puts the complete manual back in your hands.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eManual Code:\u003c\/strong\u003e 878-28197-10\u003c\/p\u003e","brand":"Ag Manuals","offers":[{"title":"Operator's Manual","offer_id":52384945635608,"sku":"YM-GPX338F-SM","price":16.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0193\/4424\/files\/PagesfromGPX338F-GPX433F-sm-opt.png?v=1783558014","url":"https:\/\/agmanuals.com\/products\/yamaha-gpx338f-gpx433f-snowmobile-service-manual","provider":"Ag Manuals, LLC","version":"1.0","type":"link"}