Underdrive pulley pros/cons | Victory Motorcycles: Motorcycle Forums

Underdrive pulley pros/cons

Discussion in 'Victory Cross Country' started by Kinger08, Jan 13, 2021 at 8:28 AM.

  1. Kinger08

    Kinger08 Member

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    I see that custom concepts has an underdrive pulley for the cross country’s. Amy thoughts on these, I’m sure they will change the speedometer a bit but I can get use to that.
     
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  2. md2420

    md2420 Well-Known Member

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    Many many threads and discussions here on the UDP. See below “similar threads” and also do a site search for it. Then buckle up and read read read.

    btw - it’s Conquest Customs that has the UDP. If you decide to go that route, get theirs...not some cheap knockoff. Another member on here got one from a diff source and the internal splines sheared from the poor metal/build quality.
     
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  3. wvrider1

    wvrider1 Well-Known Member

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    pro
     
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  4. iabob

    iabob Well-Known Member

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    Cons: your speedo will be off 7%, unless you also install a Speedo Healer. The motor now spins at 3210 rpm instead of 3000 rpm to maintain approx 80 mph. You probably don’t want your wife to know what it costs, unless you chose wisely and she doesn’t care.

    Pros: you will find a lot of talk about this doing a search and reading the many threads. To get technical gearing multiplies power. If you’re familiar with riding a 10 speed bike imagine a race where you clock your 0-20 mph time. First try it shifting from 2-4-6-8-10. Next try it going from 1-3-5-7-9. Your legs are making the same amount of power, but the gearing multiplies it to accelerate the bike faster. The difference is in 9th your legs are spinning faster than in 10th. On the motorcycle, you will accelerate faster. And the motor will be spinning 7% faster.

    I actually don’t think spinning 7% faster is bad. I always thought 6th gear on a Vic was too tall, it didn’t seem useable until over 70 mph. Now if I’m on a 2 lane highway doing between 60-70 I can actually be in 6th.
     
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  5. Kinger08

    Kinger08 Member

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    I tried the search thing and it comes up with pages of other topics, maybe I’m not hitting the rite keyword, too technical for this old fart.
     
  6. Kinger08

    Kinger08 Member

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    Never heard of the Speedo healer.
     
  7. md2420

    md2420 Well-Known Member

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    @Kinger08 ive found the best way is to search “titles only” and that helps. Also check the box that says this forum only and display as threads.

    Separately, you could just do a Google search for the vog site specifically and that can help too. Just type “site:thevog.net underdrive” in the search bar. That will only bring back results from this site.

    site:thevog.net underdrive - Google Search

    6EBA8AB5-96D4-4AFE-A923-006766DD653C.jpeg
     
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  8. iabob

    iabob Well-Known Member

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    They’re made for most any brand. Conquest also sells them. I haven’t put one on my bike, kinda got used to just knowing the speedo is reading a few mpg faster than I’m going. But it’s one of those things I think I’ll get around to one day.
     
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  9. Half_Crazy

    Half_Crazy Well-Known Member

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    The speed limit is just a suggestion...
     
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  10. Half_Crazy

    Half_Crazy Well-Known Member

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    There are no "cons". Top gear on the highway:
    what was 2500 rpm before will be 2675 after
    what was 3000 rpm before will be 3210 after
    what was 3500 rpm before will be 3745 after

    Like going from 3.55 rear gears to 3.73 in a car. A small change.
    6000 rpm in 5th gear still equates to 145-ish mph (if you had the power to pull it). You can still cruise at 100 mph for as long as you want.
    You would still finish a 1/4 mile drag race in 4th gear.
     
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  11. benawhati

    benawhati Active Member

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    Pros-endless smiles
    Cons- wrinkles from so much smiling
     
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  12. Kinger08

    Kinger08 Member

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    Thanks for all the info fellas. So I’ve read that it takes a 48mm socket to get the pulley nut off, no problem with a little heat. My question is how do you hold the engine from rotating while taking it on or off, guess I’ll be using an air impact.
     
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  13. wvrider1

    wvrider1 Well-Known Member

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    I pulled the timing cover, then you need 5/16 punch to put crank hole. Torque is 180 ftlbs. on the nut. Most 1/2 TW only go to 150. Check yours.
     
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  14. broggyr

    broggyr Administrator Staff Member

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    I used an impact to take it off and put it on, but then I held my foot on the brake pedal when I was torquing it to spec.
     
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  15. Kinger08

    Kinger08 Member

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    Cool thanks, I have a TW that goes to 325 foot pounds so I’m good there.
     
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