HF question

GoldenMotor.com

racie35

Active Member
Nov 17, 2012
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do all the harbor freight predator engines require the pulleys etc to be mounted on the right side of the bike?
That is.. with the cylinder leaning forward.
 

azbill

Active Member
May 18, 2008
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if the cylinder is angled forward, the drive shaft is on the right side of the engine
I believe any that are oriented that way are friction drive only,,,,the shaft would be turning the wrong direction otherwise ;)
 

racie35

Active Member
Nov 17, 2012
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I guess my question should be do any of them rotate a different direction allowing that cylinder orientation.....like a whizzer engine
 

chainmaker

Well-Known Member
Jan 19, 2010
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I guess my question should be do any of them rotate a different direction allowing that cylinder orientation.....like a whizzer engine
I havnt seen a 79cc but the 212 can be mounted vertically so the cylinder is facing up alot of guys are doing that way.
 

GearNut

Active Member
Aug 19, 2009
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you might be able to get a two stroke briggs or tehcumse to run the opposite direction, i never tried it so i dont know if you can,
All you need to do to get a 2 stroke to run backwards is advance the ignition "too far". However to avoid damaging the engine this must still be tuned to the point where the spark occurs at the correct degree of flywheel rotation.
Otherwise a pre-ignition condition could result and trash the piston and connecting rod, or the ignition could occur too late in the power cycle and you will be wasting power and fuel.
 

racie35

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Nov 17, 2012
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im not gonna be messing with the 2 strokes....just was figuring the cylinder forward on the 4s would let it cool easier and have the drive on the left...seems they all turn the wrong way though?
 

GearNut

Active Member
Aug 19, 2009
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Yup.
One would need to install a cam shaft that is ground to accommodate the reversal of rotation, set the ignition timing precisely to accommodate reverse rotation and install a pull start that pulls the other direction.

Splash oiling might be an issue for OHC engines too as the splash would not go where it was engineered to go.
 

racie35

Active Member
Nov 17, 2012
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I think I have it figured out.....HF 212...shaft out the left side....cyl facing back should be direct....easy to clutch up etc
 

racie35

Active Member
Nov 17, 2012
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I'll look into that....price difference isn't enough to make one choose either....I may set this bike p electric till I gather up the needed stuff, then throw it at it