XR 41 replica versus Mocca Racer

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  • John Kat
    Forum Sage
    • Oct 2010
    • 1433
    • France

    #1

    XR 41 replica versus Mocca Racer

    I took the XR 41 replica out for a ride today as I wanted to compare it to my other project bike i.e. the "Mocca Racer"
    As some of you might remember the XR 41 replica is basically a GS 1000 engine in a GSXR 1st gen chassis.
    I really love this bike, the riding position suits me fine with the clip-ons above the top yoke.
    On the go, the bike feels really small almost like a 600 cc but very stable with it's conservative geometry added to the 18" wheels.
    The engine, a 1085 with Wiseco pistons, individual APE filters, a Dynojet stage 3 kit and a Devil/Cobra exhaust goes really well with a big surge of power above 6000 rpm.
    The suspension is on the firm side but not harsh.
    In comparaison the Mocca Racer that's a GS 1000 fitted with a GSXR 1052 engine is a totally different bike.
    Just as much fun but in a different way.
    The engine revs like there is no tomorrow with a deep howl coming out of the racing Devil exhaust.
    The bike feels more modern with it's 17" wheels and superior suspension thanks to it's R6 front end and it's GSXR 2nd gen monoshock with an Ohlins unit.
    The geometry is more agressive as I lifted the rear of the bike to reduce the caster and thus the trail.
    This makes the bike more agile in the tight corners.
    I haven't weighed the two bikes but they must be much much lighter that a std GS 1000 or worse an 1100 Kat.
    The bottom line is that it's been great fun to build these bikes and the result is beyond my expectations.
    As a daily driver I would pick the Mocca Racer but if I wanted to go racing I'd go for the XR 41 replica.
    To be expected I suppose?
    Here's a picture of the two together ( the XR 41 without it's fairing)

    IMG_1049.jpg
    sigpicJohn Kat
    My bikes: CB 77, GS 1000 ST Cafe Racer with GSXR 1052 engine, GS 1000 ST, XR 41 Replica with GS 1085 engine,
    GS 1100 SZ Katana with GS 1135 EFF engine, KTM Superduke 1290 R 2020
  • dorkburger
    Forum LongTimer
    Past Site Supporter
    • Jan 2013
    • 10782
    • Stupid Freehold Boro NJ

    #2
    I followed the builds of both of these, both lovely machines.
    sigpic
    When consulting the magic 8 ball for advice, one must first ask it "will your answers be accurate?"

    Glen
    -85 1150 es - Plus size supermodel.
    -Rusty old scooter.
    Other things I like to photograph.....instagram.com/gs_junkie
    https://www.instagram.com/glen_brenner/
    https://www.flickr.com/photos/152267...7713345317771/

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    • John Kat
      Forum Sage
      • Oct 2010
      • 1433
      • France

      #3
      Originally posted by dorkburger
      I followed the builds of both of these, both lovely machines.
      You are too kind.
      Thanks!
      sigpicJohn Kat
      My bikes: CB 77, GS 1000 ST Cafe Racer with GSXR 1052 engine, GS 1000 ST, XR 41 Replica with GS 1085 engine,
      GS 1100 SZ Katana with GS 1135 EFF engine, KTM Superduke 1290 R 2020

      Comment

      • steve murdoch
        Forum Guru
        Past Site Supporter
        • May 2004
        • 8506
        • St. Catharines, On.

        #4
        Tough decisions on which bike to ride.....do i want to go fast or do i want to go FAST?

        What a fantastic stable of bikes!
        2@ \'78 GS1000

        Comment

        • John Kat
          Forum Sage
          • Oct 2010
          • 1433
          • France

          #5
          Originally posted by steve murdoch
          Tough decisions on which bike to ride.....do i want to go fast or do i want to go FAST?

          What a fantastic stable of bikes!
          The decisions are made easier when you don't have enough batteries for all the bikes...
          I've been quite disappointed by the Yuasa batteries lately as at least three of them died after about a year.
          I bought one Lithium Ion battery to see how it fares...
          sigpicJohn Kat
          My bikes: CB 77, GS 1000 ST Cafe Racer with GSXR 1052 engine, GS 1000 ST, XR 41 Replica with GS 1085 engine,
          GS 1100 SZ Katana with GS 1135 EFF engine, KTM Superduke 1290 R 2020

          Comment

          • ArttuH
            Forum Mentor
            • Jul 2005
            • 300
            • Finland

            #6
            Originally posted by John Kat
            I bought one Lithium Ion battery to see how it fares...
            Just make sure that your regulator is working properly. Lithium batteries die very quickly when overcharged.

            And I assume you are talking about LiFePo4 battery, not actual Lithium Ion? That's a small but pretty important detail. LiFePo4 batteries are compatible with charging systems that are designed for lead-acid batteries. Lithium Ion batteries aren't.
            Arttu
            GS1100E EFI turbo
            Project thread

            Comment

            • John Kat
              Forum Sage
              • Oct 2010
              • 1433
              • France

              #7
              Originally posted by ArttuH
              Just make sure that your regulator is working properly. Lithium batteries die very quickly when overcharged.

              And I assume you are talking about LiFePo4 battery, not actual Lithium Ion? That's a small but pretty important detail. LiFePo4 batteries are compatible with charging systems that are designed for lead-acid batteries. Lithium Ion batteries aren't.
              You must be right it's not Lithium Ion but a LiFePo4 battery.
              So far no problem with this battery!
              sigpicJohn Kat
              My bikes: CB 77, GS 1000 ST Cafe Racer with GSXR 1052 engine, GS 1000 ST, XR 41 Replica with GS 1085 engine,
              GS 1100 SZ Katana with GS 1135 EFF engine, KTM Superduke 1290 R 2020

              Comment

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