Yamaha TT 600 59x spare parts

Yamaha TT 600 59X – Air-Cooled Keeping Off-Road Legend Alive

It sits between the puristic XT 500 and the water-cooled WR generation Yamaha TT 600 59X (model years 1983 - 1989) as the epitome of air-cooled single-cylinder enduros: 595 cm³, four-valve SOHC, 43 mm telescopic fork, 300 mm rally brake disc - all packed into a 125 kilogram dry weight. Ex works without lights, indicators or electric starter, the TT 600 was designed for rally raids and enduro terrain; At the same time, with its small headlight kit, it was suitable as a street-legal “hard enduro” for ambitious weekend pilots. Four decades later, the punch of the air-cooled single-cylinder still impresses, but only regular maintenance and high quality Yamaha TT 600 59X spare parts protect the kick-start myth from oil shortage plagiarism, valve seat fretting or float chamber thirst. In the following guide we provide a good 2,000 words of concentrated practical knowledge: components, intervals, weak points, sensible upgrades - all tested several times in our Motorize workshop, where over 30 59X engines have been overhauled since 2008.

1 | Origin & type codes

The TT family started in 1981 with the 34K series (562 cc). It was published in 1983 TT 600 59X as a European large series and US export (Type 36A). It adopted the pistons and connecting rods from the Dakar-tested XT 550, but received a 97 mm piston with a reduced stroke (84 mm) - a total of 595 cm³. Identifying features:

The 59X was phased out in 1989; The successor TT 600 S/SC (3SW) received an electric starter, double tube frame and heavier crank. The TT 600 R DJ01 (1998) and TT 600 R 4GV (2003) with a DOHC five-valve head followed later - many components (clutch, cam chains, piston ring sets) are still backwards compatible, which makes the supply of spare parts easier.

2 | Engine & Intake – Simplex chain drive, twin carb power

The core of the 59X heart is the air-cooled one Aluminum cylinder with Nicasil coating. It houses a 4-valve SOHC layout, driven by a 219 DID timing chain via primary gear. The mixture preparation is carried out by a dual carburetor system: Mikuni VM34SS primary with vacuum slide and an intake manifold secondary carburettor Ø 30 mm, which switches on at 1/2 → full throttle. The following spare parts are essential for a long life cycle:

Setup tip: Standard nozzle 135 HD / 40 LD, needle 4J13-3, secondary nozzle 90. Open SR Racing damper requires 140 HD, secondary 95. Oil: 10W-50 Ester (2.3 l incl. filter) every 2,500 km; Valve clearance: intake 0.08 mm, exhaust 0.12 mm every 5,000 km. Check rocker arm for pitting at > 40,000 km; Replacement lever 3YF-12171-00 (nitriding steel) extends service life.

3 | Electrics & ignition – CDI kick without battery

The 59X works battery-free: 6-pole alternator delivers 35 W light circuit + 55 W ignition. CDI box 34K-85540-10 has fixed advance (14° → 34°). The weakest point is the pickup wiring harness, whose PVC becomes brittle after 30 years. Modernization:

4 | Chassis & brakes – rally suspension travel without rocking orgy

43mm KYB fork (compression at the bottom, rebound at the top) delivers 300mm of travel; Oil quantity 590 ml (SAE 5 W). The monocross rear uses a KYB shock absorber with 5-fold preload, no rebound. Brakes: 300mm NG-Wave disc + Nissin 1 piston (front), drum rear. The following are recommended for current off-road requirements:

5 | Maintenance schedule & wear and tear

6 | Typical weak points & solutions

7 | Useful upgrades – more control with the same character

• ✓ Keihin FCR-41 – +5 HP, spontaneous throttle, easy start.
• ✓ Oil cooler kit Setrab 7 rows – 12 °C less oil temp.
• ✓ Rally tank Acerbis 20 l – +180 km range.
• ✓ Hub milling + Excel rims – 1.2 kg less rotating mass.
• ✓ LED lighting + DC conversion – 65 W reserve for navigation & heated grips.

8 | Parts supply & scene

Yamaha still lists pistons, timing chains, seal sets and clutch as normal. Used market: tt-club.de, HorizonsUnlimited and eBay classifieds; There you will find NOS frames, GST plastics and rare 11 liter aluminum tanks. 3D print file shares provide speedometer holder repros, fork protector clips and float chamber breathers. Stainless steel exhaust (SR Racing) saves 1.6 kg, E-mark included.

9 | Conclusion – driving 59X means: a kick, a grin

The Yamaha TT 600 59X remains a genuine enduro icon: air-cooled torque single, rally suspension travel and minimalist weight. With high quality TT 600 59X spare parts - from piston rings to iridium candles to progressive springs - the legendary one-kick start, the floating front and the endless drift over gravel roads are guaranteed. Keep oil fresh, valves accurate, Nicasil intact - and your 59X will still be creating clouds of dust even after 50 years. Kick it, ride it, love it!

Browse now - and equip your 59X with tested Yamaha parts for your next off-road excursion!