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  • Cropduster Posts: 305
    Brisvegas
    Stage 1 Poster Cropduster
    20 Jul 2017 09:41 AM
    I was talking to a guy who tells me the forty-eight is geared taller than other sportsters for better economy because the tank size is so small......

    Anyone know what the std front pulley size is on them? 

    If anyone has removed their std front pulley from a forty-eight let me know? i'm going to get a pulley cover made seeing as no one sells them anymore.
    Cheers

  • brash Posts: 513
    Performance Poster brash
    20 Jul 2017 09:48 AM

    30 tooth on 48

    Best thing I ever did to my old 48 was put a 28T pulley from an 883 on, really woke it up and got it into the powerband sooner. Highway rpm wasn't ridiculously high either.

    Joker machine make a trick looking cover.

  • Cropduster Posts: 305
    Brisvegas
    Stage 1 Poster Cropduster
    20 Jul 2017 03:33 PM
    interesting, did it effect your consumption much? i know the tank size is woeful but i don't really want to be stopping more often than i do now... LOL
  • Krash Kinkade Posts: 1741
    Motor Head Krash Kinkade
    20 Jul 2017 03:53 PM
    CD, go for it! i like lower gearing & much easier on motor. think my m2 Carb Buell has 27tooth front pulley same as sporty just lower. my carb sporty 1200 bit taller but have to check what sprocket . i just did 260k non stop run on sporty this morning and did not hit reseve. the peanut gas tank the best! just for carb very hard to find, mine has the ugly long tank . Buell has lower gearing than my 1200 carb sporty gets good economy 3.7L per 100k riding normal has 94HP on LA cycles dyno
  • brash Posts: 513
    Performance Poster brash
    20 Jul 2017 03:59 PM
    Posted by Cropduster on 20 Jul 2017 03:33 PM
    interesting, did it effect your consumption much? i know the tank size is woeful but i don't really want to be stopping more often than i do now... LOL

     

    I had the 7.9L tiny tank on mine, with cams and headwork I was lucky to get 90km's on a tank. Plus I rode that bike like I stole it.

  • noctm Posts: 282
    WA
    Stage 1 Poster noctm
    20 Jul 2017 07:13 PM
    Posted by brash on 20 Jul 2017 01:59 PM

    Plus I rode that bike like I stole it.

     just like you should do i reckon!

  • Krash Kinkade Posts: 1741
    Motor Head Krash Kinkade
    20 Jul 2017 07:19 PM
    Posted by brash on 20 Jul 2017 03:29 PM
    Posted by Cropduster on 20 Jul 2017 03:33 PM
    interesting, did it effect your consumption much? i know the tank size is woeful but i don't really want to be stopping more often than i do now... LOL

     

    I had the 7.9L tiny tank on mine, with cams and headwork I was lucky to get 90km's on a tank. Plus I rode that bike like I stole it.


    the old peanut tank did not go far but buell light at 190kg so economy different, the ridged motor carb sporty lighter too at 220kg the rubber mount sporty got heavy


    but that's how harley do it


    well on the street i can't afford to loose licence so just ride normal at track i'll see how i go no speed limit anyone welcome to have fun!

    just know i'm out dated cheers

     

  • shadowarrior Posts: 218
    Gold Coast
    Stock Poster shadowarrior
    21 Jul 2017 09:05 AM
    Wondering if the 1200 Sportster custom has the same pulley size as a 48. 
  • StinkFinger Posts: 510
    Performance Poster StinkFinger
    21 Jul 2017 02:33 PM
    Stock pulley sizes on my XR are 28t front / 68T rear... I have tried all combinations with 28T, 29T, 30T fronts and 68T and 66T rears and ended up back at the start 28/68 haha.

    Just remember the thread on the front pulley nut is lefthand thread and is pretty tight.

    I put it first gear, and give my long breaker bar a good smack with a heavy copper hammer, a rattle gun would be alot easier if you have one.

    And don't forget your speedo is gunna be out a little, pretty easy to recalibrate that though if you are using powervision or TTS.


    p.s.
    if anyone has a 27T front pulley for a sportster for sale, i would be interested in buying it. cheers
  • Cropduster Posts: 305
    Brisvegas
    Stage 1 Poster Cropduster
    21 Jul 2017 03:16 PM
    nice, thanks guys
  • Dan C Posts: 2
    Stock Poster Dan C
    13 Feb 2018 10:22 PM
    I bought a smaller front sprocket by 1 tooth but the mechanics said there wasn’t enough room on the rear swing arm too tighten the belt.Did you guys have any issues like this 
  • Greeniron Posts: 88
    Gold coast QLD
    Stock Poster Greeniron
    14 Feb 2018 09:19 AM
    Posted by StinkFinger on 21 Jul 2017 02:33 PM
    Stock pulley sizes on my XR are 28t front / 68T rear... I have tried all combinations with 28T, 29T, 30T fronts and 68T and 66T rears and ended up back at the start 28/68 haha.

    Just remember the thread on the front pulley nut is lefthand thread and is pretty tight.

    I put it first gear, and give my long breaker bar a good smack with a heavy copper hammer, a rattle gun would be alot easier if you have one.

    And don't forget your speedo is gunna be out a little, pretty easy to recalibrate that though if you are using powervision or TTS.


    p.s.
    if anyone has a 27T front pulley for a sportster for sale, i would be interested in buying it. cheers

     Hi stinkfinger , you want to put a smaller front pulley than you currently have on the front ? Won’t that increase the RPM more (say doing 100kph) than putting a larger one on ?

    I changed my 250cc rear 58t ring gear to a 38t and the 14t drive sprocket to a 16t . I was able to go 30kph faster @same RPM and better fuel consumption 

  • Omzz48 Posts: 18
    Melbourne
    Stock Poster Omzz48
    14 Feb 2018 10:32 AM
    I had the 7.9L tiny tank on mine, with cams and headwork I was lucky to get 90km's on a tank. Plus I rode that bike like I stole it.

     Mate im the same, I fill up every ride it shits me! If I ride hard the light comes on at 90km and then starts popping at 100 

  • StinkFinger Posts: 510
    Performance Poster StinkFinger
    14 Feb 2018 11:22 AM
    Posted by Greeniron on 14 Feb 2018 09:19 AM
    Posted by StinkFinger on 21 Jul 2017 02:33 PM
    Stock pulley sizes on my XR are 28t front / 68T rear... I have tried all combinations with 28T, 29T, 30T fronts and 68T and 66T rears and ended up back at the start 28/68 haha.

    Just remember the thread on the front pulley nut is lefthand thread and is pretty tight.

    I put it first gear, and give my long breaker bar a good smack with a heavy copper hammer, a rattle gun would be alot easier if you have one.

    And don't forget your speedo is gunna be out a little, pretty easy to recalibrate that though if you are using powervision or TTS.


    p.s.
    if anyone has a 27T front pulley for a sportster for sale, i would be interested in buying it. cheers

     Hi stinkfinger , you want to put a smaller front pulley than you currently have on the front ? Won’t that increase the RPM more (say doing 100kph) than putting a larger one on ?

    I changed my 250cc rear 58t ring gear to a 38t and the 14t drive sprocket to a 16t . I was able to go 30kph faster @same RPM and better fuel consumption 

     

    Yeah I do, I want to go faster sooner on the 1/4 mile 


    Fuel economy is for vegetarians 

  • tussuck Posts: 1323
    Melbourne
    Performance Poster tussuck
    14 Feb 2018 07:08 PM
    Have you done the numbers in a calculator?  My gut says that with all things being equal between two bikes a stock geared would thrash the 27 tooth option.  UNLESS the maths have been done to time the finish line with max rpm in the final gear.

    Have a play on this site...
  • StinkFinger Posts: 510
    Performance Poster StinkFinger
    14 Feb 2018 07:31 PM
    Posted by tussuck on 14 Feb 2018 07:08 PM
    Have you done the numbers in a calculator?  My gut says that with all things being equal between two bikes a stock geared would thrash the 27 tooth option.  UNLESS the maths have been done to time the finish line with max rpm in the final gear.

    Have a play on this site...

     No I haven’t.. pure guess work from racing a few times haha. I did race a bloke that had a slower top speed but he beat me by half a second, so my theory is go faster sooner. I have no idea if it will work.


  • tussuck Posts: 1323
    Melbourne
    Performance Poster tussuck
    14 Feb 2018 08:16 PM
    I recon the gear changes will kill your speed; unless your clutchless shifting, but thats bloody tricky from 1st to 2nd and not elegant 2nd to 3rd (but doable).

    I basically do not use my clutch once I'm in 2nd gear onwards; even downshifting on the motorway is a blip and tap down.
  • StinkFinger Posts: 510
    Performance Poster StinkFinger
    14 Feb 2018 08:44 PM
    You are no doubt right, but I’m the type that has to try stuff. At the moment I have to shift right before the finish line .. I was thinking I could start in 2nd with a 27t, and hit 5th sooner. The hard part will be keeping the front down at the start, it always is on the XR. Anyway wouldn’t mind trying it, but hard to find one for my bike though unless I buy a aluminium one for $300-400 , so I’ll probably never know.
  • tussuck Posts: 1323
    Melbourne
    Performance Poster tussuck
    14 Feb 2018 10:49 PM
    Never hurt to give it a crack!....  Read up on the small sprocket size though as can the belt bend that radius okay plus would you have enough adjustment left in the rear axle adjuster.
  • StinkFinger Posts: 510
    Performance Poster StinkFinger
    15 Feb 2018 12:44 AM
    Yeah I’ve known about the pulley for a few years, almost got one of these for $50 from gumtree but the bloke was in Perth and wouldn’t post it, pick up only for fucks sake.
    I’m not paying 350+ for one. I’m not that keen to find out if it helps 1/4 mile times .

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