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  • brash Posts: 559
    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.

  • Krash Kinkade Posts: 2028
    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: 559
    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: 289
    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: 2028
    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: 223
    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. 
  • Dan C Posts: 8
    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 
  • Omzz48 Posts: 53
    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 

  • tussuck Posts: 1401
    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...
  • tussuck Posts: 1401
    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.
  • tussuck Posts: 1401
    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.
  • shadowarrior Posts: 223
    Gold Coast
    Stock Poster shadowarrior
    15 Feb 2018 01:21 AM
    So, old school knowledge on what I did on my other bikes might help you a tad bit. Am gonna use the term sprocket because that's all I used instead of fancy pulleys and belts :P
    Everything is about the ratio. Rear divided by Front. Increase the ratio to gain acceleration but lose top end, decrease the ratio to increase top end (higher speeds at lower rpm) and lose acceleration.
    So with StinkFinger's stock 68r and 28f, he has a ratio of 2.43 (rounded)
    He could achieve a faster acceleration by putting a 70r and 27f to get around 2.6 (rounded). That should give him a noticeable and snappier acceleration at the cost of top speed rpm.
    I had increased my ratio on the ZX6R Ninja and decreased the ratio on my ZRX1200 tourer. 

    @Stinkfinger, have you also considered advancing your ignition timing by say +2 or +4? Or you already running a map which does this?
  • Krash Kinkade Posts: 2028
    Motor Head Krash Kinkade
    15 Feb 2018 09:55 AM
    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...

     with a dyna twin cam carb, I had a lot of pass's in 1/4 mile I found best gear ratio for me was 3.42 final, I dropped the primary ratio lower using evo primary clutch hub ( lower geared, made a good gain also helps clutch work better. another thing I found with the lower primary ratio was my cranking pressure went up, when I tested it.

    with sporty I don't know how to lower primary ratio. but I have both 27tooth & a 26 tooth front Sproket I can try. I found at drags having lower gears helps traction but you also have to do everything quicker to see results. like your rev's will come up quicker so you have to react to the shift quick ( every shift takes time ) the quicker you shift the better, normal lowering your gear ratio will also lower your 60 ft time so if you lower your 60ft and do everything else right your et will be lower.

  • Krash Kinkade Posts: 2028
    Motor Head Krash Kinkade
    15 Feb 2018 10:39 AM
    Posted by StinkFinger on 15 Feb 2018 02:44 AM
    Posted by shadowarrior on 15 Feb 2018 01:21 AM
    So, old school knowledge on what I did on my other bikes might help you a tad bit. Am gonna use the term sprocket because that's all I used instead of fancy pulleys and belts :P
    Everything is about the ratio. Rear divided by Front. Increase the ratio to gain acceleration but lose top end, decrease the ratio to increase top end (higher speeds at lower rpm) and lose acceleration.
    So with StinkFinger's stock 68r and 28f, he has a ratio of 2.43 (rounded)
    He could achieve a faster acceleration by putting a 70r and 27f to get around 2.6 (rounded). That should give him a noticeable and snappier acceleration at the cost of top speed rpm.
    I had increased my ratio on the ZX6R Ninja and decreased the ratio on my ZRX1200 tourer. 

    @Stinkfinger, have you also considered advancing your ignition timing by say +2 or +4? Or you already running a map which does this?

     Yeah I can sacrifice some top end speed, it only pulls 107 on the 1/4 mile, got another 20-25mph up it’s sleeve atleast.

    Timing on this bike has been a pain in the arse with the extra compression, I had to shave a heap off the maximum load areas in  the map hammer sent me. 10 degrees in the worst area to stop pinging. They must have better fuel over there.

    I could probably add a bit more timing with lower gearing, it wouldn’t be much though. Give it a few powervision autotunes with the widebands, just to clean up the airflow charts and hit the drags... so who’s got that 27t pulley they want to sell to me... cheap?


    :)

     


    look's easy on paper!

    difference is your talking about a multi valve light weight high raving 4 cylinder

    the sportster motor a lot different, so what worked for u on the ninja  might not work on a motor thats near its limits at 7,000rpm and only has two cylinders.

    also tune will be a lot different.


  • shadowarrior Posts: 223
    Gold Coast
    Stock Poster shadowarrior
    15 Feb 2018 02:16 PM
    Posted by StinkFinger on 15 Feb 2018 02:14 PM
    Posted by Cropduster on 15 Feb 2018 11:06 AM
    Posted by shadowarrior on 15 Feb 2018 01:21 AM
    So, old school knowledge on what I did on my other bikes might help you a tad bit. Am gonna use the term sprocket because that's all I used instead of fancy pulleys and belts :P
    Everything is about the ratio. Rear divided by Front. Increase the ratio to gain acceleration but lose top end, decrease the ratio to increase top end (higher speeds at lower rpm) and lose acceleration.
    So with StinkFinger's stock 68r and 28f, he has a ratio of 2.43 (rounded)
    He could achieve a faster acceleration by putting a 70r and 27f to get around 2.6 (rounded). That should give him a noticeable and snappier acceleration at the cost of top speed rpm.
    I had increased my ratio on the ZX6R Ninja and decreased the ratio on my ZRX1200 tourer. 

    @Stinkfinger, have you also considered advancing your ignition timing by say +2 or +4? Or you already running a map which does this?

     Advancing ignition timing is a big no no on harleys, any mods usually require it to be retarded or there are detonation/preignition problems i'm told.

    There’s gains to be had by adding some timing to the stock XR engine with a good pipe and air filter. I’ve seen the maps and the dyno sheets. Easy to see the difference with the powervision software compare option too. 

    I can’t remember the exact numbers of how much they adjusted timing by, but the gains were impressive. 10, 15hp gain was common, some of them even getting over 20.

    I’m sitting outside a hospital in Brisbane waiting for my wife to come out of surgery at the moment. Hopefully I’ll be back home in the bush tomorrow and will upload a few screen shots of the timing changes in the near future, if you like.

     Ouch! Hope she has a speedy recovery mate :(



  • shadowarrior Posts: 223
    Gold Coast
    Stock Poster shadowarrior
    15 Feb 2018 05:16 PM
    Posted by Cropduster on 15 Feb 2018 04:42 PM
    should be!

    it will take me a couple of months to accumulate everything, i've been buying specific tools i'm going to need as well as making sure i have the manual, loctite etc. as well as sit tight for various size parcels to arrive.....

     Did you give them the correct address? Double check just to be sure...its the one in Terania Avenue, Ormeau Hills.

  • shadowarrior Posts: 223
    Gold Coast
    Stock Poster shadowarrior
    17 Feb 2018 12:50 PM
    How do you find the powervision, specially the basic auto tune feature it comes with it? Am guessing you are running a wide band sensor with target tune? 
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