41t or 36t sproket

Discussion in 'General Questions' started by 4wdingman, Dec 8, 2008.

  1. 4wdingman

    4wdingman New Member

    hey i know which sproket to get a 41t or a 36t i have a 44t and i am sick of the motor going full and i am not going no where, i do go offroad everynow and then but thats it, thanks

  2. Simonator

    Simonator Guest

    I am running the 40T and I like it alot. I gained about 5 mph over the 44T. Acceleration is still decent.
  3. DIYMark

    DIYMark Member

    Depends on how your engine is tuned?!

    If your engine is stock (well lightly modded) go for 36T

    If you have done some extensive mods (porting and/or head polish) go for 41T.

    This is purely from experience...

    Before my HT would pull like a tractor, I had a huge flowing exhaust system, NON polished head and had NOT changed timing. It was pretty fun for off road!

    Then came the mods. Ive polished the the head and with this mod Ive lost ALOT of torque - my theory is that the servery pitted finish in the head from casting essentially "holds" fuel in it so on the power stroke combustion takes longer. This gives you more low end torque but limits your rpm.

    Then once Ive ported the engine Ive changed the timing of it and now the engine REALLY revs. Honestly its got the same pick up (little bit faster) and max revs (from sound) as a ~66cc chainsaw does now - the bike screams at top end (considering to get a better little end bearing to take this level of revs - surprisingly all my "piston ports" lightened it and has balanced the engine really well!).

    Also I am running acetone in my fuel - for anyone who done this lets say that running acetone drops your torque by X amount. Well running acetone with a polished head gives you a 3X drop in torque and that's a big deal in a single speed set up.

    So from now on I will not run acetone as a polished head is like permanent acetone (until carbon builds up) and gives you twice the effect of just acetone alone.

    So yeah basically, 36T for stock or 40/41T for modded (when modded I mean porting, polished head - any other mods generally add torque).

    For me, well I'm running a 36T and I have to get to 20Km/h before its gets on the pipe and really picks up. So with all there revs I need torque and my next mods will be an exhaust OTHER than stock (stock ATM) and a new carb (more flow/tuning), this added flow will give torque a huge boost then the expansion chamber will give the engine a bit more top end!

    Sorry for the long post but I hope you can decide now over a 36 or 41T.
  4. heathyoung

    heathyoung Member

    Thats an interesting take on the situation - going from a 36 to a 41 would reduce your top speed somewhat, but your improved top end bearing would allow higher RPM...

    What bearing did you use on the top end? I'm looking to do similar mods, also located in Aus so parts sources etc would be relevent.
  5. DIYMark

    DIYMark Member

    I haven't got one yet but I am looking into it. Ill probably just go to my local chainsaw shop. The sthil guys would be able to get one if I give them the dimensions and also they bearing should be fine for up to 13K rpm.