05 Fatboy Primary Fluid

Discussion in 'Touring Models' started by Fatboy John, Jan 5, 2011.

  1. Fatboy John

    Fatboy John Member

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    Just got back up on the road with a 2005 Fatboy. Only 4k miles on it but all the fluids needed changing. Slapped a 20-50 syntec in for oil, Royal Purple 75-90 in the gear case but I'm stumped as what to use for the primary. Dealer says come buy this but didnt bother to > pfft

    Knows most in here has a away around the dealer costs.
     
  2. TQuentin1

    TQuentin1 Well-Known Member Staff Member Moderator

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    I suggest the following lubricants:

    Engine: FULL synthetic 20W-50 VTwin engine oil
    Tranny: FULL synthetic 75W-140 GL-5 gear lube
    Primary: Fit-for-purpose wet clutch chaincase lube like HD Formula + or Spectro Heavy Duty Primary Chaincase Oil

    TQ
     
  3. Fatboy John

    Fatboy John Member

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    Appreciate that 1 Tquentin. Was fixin change gear lube l8r this evenin glad I asked. I'll swap that 75-90 for 75-140 and I'll grab the Spectro for the primary...cheers
     
  4. Breeze3at

    Breeze3at Well-Known Member

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    John; That 75/90 is perfectly fine if you already have it in there. That's what I have in my '07 trans.
    I also prefer HD formula + for my primary, but any quality 30 will be good.
    HD recommends 20/50 in all 3 holes, so you see it is not critical. But we sure do have our opinions about it!
     
  5. maine-e-axe

    maine-e-axe Junior Member

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    Depends where you live IMO, I live in the north where the temps are cooler:newsmile062: and I've run 75/90 for 20 years, but if I lived in the south where it's hot:beach I would run something heavier JMHO
     
  6. Jack Klarich

    Jack Klarich Expert Member

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    H D Formula plus is fine, I run 75/140 synthetic in my tranny it likes it:p
     
  7. Bud White

    Bud White Well-Known Member Retired Moderators

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    Ive been using valvoline 20w50 for bikes with wet clutches for better clutch protection .. works pretty well
     
  8. TQuentin1

    TQuentin1 Well-Known Member Staff Member Moderator

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