79cc Boss Hog Thunder Thud

Grubee Inc


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Here's the "Boss Hog Thunder Thud".   Free Shipping;

Made for racing > all out performance. 

    We're have done final development and dyno testing in China at the WoodPecker factory!    We are comparing the pros and cons of crankcase reed valve to that of cylinder port reed valve positioning to determine who would win the race.   Jury's not in as Q1 testing was held up due to FungFlu.!

  1. 79cc displacement;  50x40 mm bore & stroke, erroneously called 100cc.  

  2.  Aluminum Billet CNC cut HP head.

  3. 3 hole Balanced crank;   smooth operation all the way up to 10,000 revs. 
  4. Ported and polished cylinder with cast iron piston sleeve.

  5. 6203 bottom in bearings.  ( standard engines have smaller 6202 bearings.)

  6. Special 10 roller wrist pin needle bearing. ( Std. engines have 9 rollers. )

  7. Reed valve induction.   

  8. Special Light wt. domed piston.   

  9. 6cc displacement head with thin copper gasket.

  10. NGK BPR7 spark plug.

  11. FatBoy 4700 T magneto coil for HP external aftermarket TCI use. 

  12. Wide 10T drive sprocket for 415 chain.

  13. Special jetted Mikuni knockoff Racing carb. with open bell intake.   

  14. Every engine must pass a performance run test before shipment. 

  15. Factory adjusted clutch for thumb turn drive sprockets when lever is pushed in. 

  16. To max out horse power benefits a Plenum Chamber or an Expansion Chamber exhaust system must be used. 

  17. Limited availability;  We only will bring 5 BHTT engines per year for US market.

  18. Engine only;  Not available in total installation kit form.  

  19. Only Sold to qualifying customers with proper mechanical knowledge and abilities.

  20. No extended warranty on racing engines but Guaranteed to run when received.