TROY PIERCE RACING

340 Polaris Mod Race Setup

55.6 stroke 63.5 bore

UPDATED! 3-1-2018

Want your TPR 340 Polaris racer to reach it’s full potential? Start with these specs that Troy developed over years of  testing. Then test often to find the best possible combination for you, your driving style,  the track where you will be racing and the conditions.

  • Primary Clutch Spring – 160/310 with Polaris Quick Change using .120 to .130 shims behind spider.
  • Primary Clutch Weights – Full L-1 34.5-35.5 gram’s full tail, R-1 35-36.5 gram’s cut tail.
  • Engagement – 5000-6000 rpm
  • Max rpm 9800 – 10,000 rpm
  • Secondary clutch – Polaris button – 50/34 R-8 long start. R-34 short start.
  • Secondary clutch spring – Polaris blue 2nd hole, TPR purple white stripe, 2nd hole
  • Belt – 3211114, 3211177.
  • Carburetors – 38mm round slide
  • Main jet piston port – 32+ degrees 320 main, 25+ degrees 330 main, 20+ degrees 340 main, 10+ degrees 350 main
  • Main jet Reed – 32+ degrees 390 main, 25+ degrees 400 main, 20+ degrees 410 main, 10+ degrees 420 main.
  • Pilot – 45
  • Airscrew – 1.5 out
  • Needle – 6dh3
  • Nozzle – Q4
  • Cutaway – 1.5
  • Fuel – Sunoco – VP-110.
  • Oil – 24 to 1 Redline, PJ1 Gold fire
  • Pipes – TPR Pro-flow, stinger .887 I.D.
  • Piston skirt – 63.00 mm
  • Intake – 91.5 X 45.0 X 63.0 mm
  • Exhaust – 27.0 X 43.0 X 55.6 mm
  • Transfers – 43.00 mm
  • Timing – 28 degrees@5000, 13 degrees @9800
  • Head – .50 squish, 14.0 to 1 comp.
  • Gearing – 17-41 86 mph, 17-42 84 mph, 16-41 81 mph, 2.52 9 tooth drivers, 9800 mph

Quick Contact

Find Us at:
33327 State Highway 11
Roseau, MN 56741
(218) 242-7949

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