porting the 66cc

Discussion in 'General Questions' started by battery, Mar 10, 2014.

  1. battery

    battery Member

    ok so im dis assembling my engine to give the insides a look at 1,000 miles and put it on a new 29" I am looking to widen the ports a mm or so. I still have port valve no reed valve for me. can anyone tell me the do's and dont's. how much can I shave in width? or should I?
     

  2. jaguar

    jaguar Well-Known Member

    the most benefit to be had is widening the intake port. also take 1mm off the piston skirt at the intake side.
    widening the exhaust port gives more top end power while giving less low rpm power.
    you can widen the transfers toward the rear 2mm.
    increase cylinder compression while you're at it.
     
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  3. jaguar

    jaguar Well-Known Member

    extended intake is DIY although buying their zigzag manifold does extend it some.
    if you don't have the Jaguar CDI then just plane the head and cylinder mating surfaces for a better seal. Without my CDI the higher compression is hard on the bearings.
    widening the intake just gives the engine a bit more power. with too little power you have to scream the engine more and slip the clutch more when taking off which shortens the life of the engine.
     
  4. battery

    battery Member

    Last question, Would you happen to know if the Racing carb from jnm comes with the longer offset intake? It mentions it in the parts list, but is not %100 clear.
     
  5. battery

    battery Member

    unfortunatly the jaguar cdi was out of stock :/ but I ordered it. Fingers crossed they get in soon! I will do the porting and shaving when it comes in.
     
  6. jaguar

    jaguar Well-Known Member

    the CDIs will be in stock in 10 days.
    best to ask JNM about the intake.
     
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  7. battery

    battery Member

    SWEET! and thank you i tried to call but no answer. I'll try again or email if that doesnt work.
     
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