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  1. #1
    Guidoo's Avatar
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    Getting a handle on these 4 Tec engines

    I'm new to these new SC 4 Tec engines, coming from Yamaha SHO&SVHO engines. So these 4 Tec engines don't use a sprag bearing on the SC drive to allow the SC to spin down when the throttle is closed? I looked at parts break down. Very vague as to the assembly.


  2. #2
    BigDfromTN's Avatar
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    No sprag bearing. They are direct drive with clutch washers on each side of the gear.

  3. #3
    Guidoo's Avatar
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    Are these engines particular sensitive to oils? Like having the clutch slip from anti-friction additives?

  4. #4
    Mothman's Avatar
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    Yes. Imagine a motorcycle with a wet clutch. It's the same concept though the 'clutch' is on the sc drive. This is why setting slipis extremely important and engine oil with additives will cause uncontrolled slip. With brp's oil I run 1ftlb to 1psi, or a tiny bit more.

  5. #5
    Guidoo's Avatar
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    Ok. That's what I thought, just wanted to be sure. We have the same issue with the clutches on Yamaha's.

  6. #6
    If i knew,...I wouldn't ask sea-one's Avatar
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    Use a Synthetic blend oil not a full synthetic oil

  7. #7
    Banned User
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    Any 10w40 motorcycle oil that states jaso and for wet clutch will do. I use valvoline vv740 and runs better then brp oil. $3 A quart or $7 a quart for their synthetic with jaso and for wet clutch as well. Try walmart, $3.58 each quart.
    http://www.walmart.com/ip/Valvoline-...e-Oil/16879749

    http://www.walmart.com/ip/Valvoline-...ingMethod=p13n
    Last edited by JeffStalone; 07-11-2015 at 04:19 PM.

  8. #8
    Guidoo's Avatar
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    At $50 a gal for BRP oil is high.

  9. #9
    Tiny's Avatar
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    Ah yes, the good old oil debate....I look at it this way.....If you bought a Porsche or Ferrari would you buy Walmart oil????

  10. #10
    Guidoo's Avatar
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    Lol. Everything I own has Mobile1 in from first oil change. Except for my wife's FZS. Still running Yamaha 4W. It's coming due for a change soon. Probably change over to syn oil.

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