{"id":4725,"date":"2026-01-03T20:05:07","date_gmt":"2026-01-03T11:05:07","guid":{"rendered":"https:\/\/www.decoboco.info\/en\/?p=4725"},"modified":"2026-09-24T12:54:47","modified_gmt":"2026-09-24T03:54:47","slug":"inazuma-1200-gsf-carb-swap-uotani-tuning","status":"publish","type":"post","link":"https:\/\/www.decoboco.info\/en\/20260103\/everyday-events\/inazuma-1200-gsf-carb-swap-uotani-tuning","title":{"rendered":"Inazuma 1200 GSF1200 Conversion! Unleash the True Oil-Cooled Power with BST36 Carburetor Swap & AS Uotani SP2"},"content":{"rendered":"
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It’s a hassle, but there’s something exciting about using a carburetor with an air cleaner box, right?
We’re working on converting the Inazuma 1200 to GSF1200 spec (stock).
Since we’ve done this before, I’m reading through my old blog posts to refresh my memory\u2026

That’s right, that’s right.
By the way, we’re scheduled to open from 1\/7 (Wednesday). The factory is next door, so it’s easy and fun!
Here’s to another year of hard work and good vibes. <\/p>\n\n\n\n

Custom Log for This Article<\/span><\/strong><\/span><\/div>
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Vehicle: <\/strong> SUZUKI GSX1200 (Inazuma 1200)<\/p>\n\n\n\n

Specification Changes: <\/strong><\/p>\n\n\n\n

    \n
  1. Intake: <\/strong> GSF1200 OEM MIKUNI BST36SS<\/strong> Carburetor swap (upgraded from stock CVK32 to larger bore). <\/li>\n\n\n\n
  2. Ignition: <\/strong> AS Uotani SP2 Full Power Kit<\/strong> installed. <\/li>\n<\/ol>\n\n\n\n

    Goal: <\/strong> Increase intake air volume and deliver a powerful spark to fully unlock the engine potential of the detuned Inazuma. <\/p>\n\n\n\n

    Result: <\/strong> Torque thickness and throttle response sharpness improved dramatically. It’s practically a different bike now. <\/p>\n<\/div><\/div>\n\n\n\n

    \"\"<\/a><\/figure>
    \n

    Another blog by Decoboco.
    \u300cRURAL GARAGE<\/strong>\u300d<\/span>

    A hidden space for non-motorcycle topics.
    Daily convenience items, relocation, delicious food, life philosophy<\/strong> and more. <\/span>
    \u2190click<\/span><\/strong><\/p>\n<\/div><\/div>\n\n\n\n

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    \n\t\t\t\t\t\n\t\t\t\t\t\t\"\"\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t
    \n\t\t\t\t
    \n\t\t\t\t\t\n\t\t\t\t\t\tAS Wotani SPII full power kit (S. Inazuma1200)\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t\t\t
    AS\u30a6\u30aa\u30bf\u30cb<\/div>\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t
    \n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\"\"\n\t\t\t\t\t\t\t\u53e3\u30b3\u30df\u3092\u898b\u308b<\/span>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
    \n\t\t\t\t\t
    \n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\tAmazon\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t
    \n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\tRakuten\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t
    \n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\tYahoo!\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t
    \n\t\t\t\t\t\"\"\n\t\t\t\t\t\u30dd\u30c1\u30c3\u30d7<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t<\/div>\n\n\n\n
    \t\t
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    \n\t\t\t\t\t\n\t\t\t\t\t\t\"\"\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t
    \n\t\t\t\t
    \n\t\t\t\t\t\n\t\t\t\t\t\tTeramoto T-REV \u03c612 0.07 Black 1313\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t\t\t
    \u30c6\u30e9\u30e2\u30c8(TERAMOTO)<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t
    \n\t\t\t\t\t\t\u00a525,093\t\t\t\t\t\t\uff082026\/09\/21 10:35\u6642\u70b9 | Amazon\u8abf\u3079\uff09<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t
    \n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\"\"\n\t\t\t\t\t\t\t\u53e3\u30b3\u30df\u3092\u898b\u308b<\/span>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
    \n\t\t\t\t\t
    \n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\tAmazon\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t
    \n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\tRakuten\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t
    \n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\tYahoo!\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t
    \n\t\t\t\t\t\"\"\n\t\t\t\t\t\u30dd\u30c1\u30c3\u30d7<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t<\/div>\n<\/div>\n\n\n\n
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    <\/div>\n<\/div>\n<\/div>\n\n\n\n
    <\/div>\n<\/div>\n\n\n\n
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    \"\"<\/a><\/figure>\n<\/div>\n<\/div>\n\n\n\n\n\n\n\n
    <\/div>\n\n\n\n

    Enlarging the air cleaner box to the correct position<\/h2>\n\n\n\n
    \n
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    \"\"<\/figure>\n<\/div>\n\n\n\n
    \n
    \"\"<\/figure>\n<\/div>\n<\/div>\n\n\n\n

    You can’t just wing it with machining work\u2026
    If you prepare positioning guides first, you can work endlessly.

    We enlarged the holes like this.
    We pry it out while minimizing metal shavings. <\/p>\n\n\n\n

    \"\"<\/figure>\n\n\n\n

    Heat removes it like this.
    The issue is that air cleaner boxes deform slightly over time, so you need to be careful. <\/p>\n\n\n\n

    \n
    \n
    \"\"<\/figure>\n<\/div>\n\n\n\n
    \n
    \"\"<\/figure>\n<\/div>\n<\/div>\n\n\n\n

    Heat a grooving cutter (without power) on the stove and pry it out in one go.
    Smoothing it with your finger right after prying saves time. <\/p>\n\n\n\n

    Inazuma 1200 \u2192 GSF1200 conversion progressing. <\/h2>\n\n\n\n
    \n
    \n
    \"\"<\/figure>\n<\/div>\n\n\n\n
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    \"\"<\/figure>\n<\/div>\n<\/div>\n\n\n\n

    It can be installed just like the original.
    We’ll use GSF1200 throttle and choke cables. <\/p>\n\n\n\n

    <\/p>\n\n\n\n

    We’re using NGK power cables with the Uotani full power kit. <\/h2>\n\n\n\n
    \"\"<\/figure>\n\n\n\n

    The plug hole cover unique to oil-cooled engines is a non-removable part.
    This part has gotten ridiculously expensive\u2026 I can’t really afford it. <\/p>\n\n\n\n

    \n
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    \"\"<\/figure>\n<\/div>\n\n\n\n
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    Don’t force it into this hole\u2026
    Unexpected issues could arise\u2026

    The hole position is tricky and hard to enlarge, that’s real.
    Using a 20\u03c6 packing punch clamped in a vise removes it cleanly. <\/p>\n\n\n\n

    \n
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    \"\"<\/figure>\n<\/div>\n\n\n\n
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    Slimming down the packing punch slightly on the lathe will make it work even better. <\/p>\n\n\n\n

    \"\"<\/figure>\n\n\n\n

    Setup is good to go like this. <\/p>\n\n\n\t\t

    \n\t\t\t\t\t\t\t
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    \n\t\t\t\t
    \n\t\t\t\t\t\n\t\t\t\t\t\tNGK (NGK) 2-Wheel Power Cable (1 Pack\/Blister Pack) Cap: Black\/102\u00b0 Type Cable Color: Black [1515] X4K\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t\t\t
    \u65e5\u672c\u7279\u6b8a\u9676\u696d(NGK)<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t
    \n\t\t\t\t\t\t\u00a53,608\t\t\t\t\t\t\uff082026\/09\/22 15:35\u6642\u70b9 | Amazon\u8abf\u3079\uff09<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t
    \n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\"\"\n\t\t\t\t\t\t\t\u53e3\u30b3\u30df\u3092\u898b\u308b<\/span>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
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    \n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\tAmazon\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t
    \n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\tRakuten\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t
    \n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\tYahoo!\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t
    \n\t\t\t\t\t\"\"\n\t\t\t\t\t\u30dd\u30c1\u30c3\u30d7<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\n\n\n

    The Uotani main unit bracket is titanium <\/h2>\n\n\n\n
    \n
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    \"\"<\/figure>\n<\/div>\n\n\n\n
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    It doesn’t have to be titanium, but\u2026
    I had some lying around unused, so I’m putting it to work. <\/p>\n\n\n\n

    We’re mounting it almost exactly where the stock unit goes. <\/p>\n\n\n\t\t

    \n\t\t\t\t\t\t\t
    \n\t\t\t\t\t\n\t\t\t\t\t\t\"\"\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t
    \n\t\t\t\t
    \n\t\t\t\t\t\n\t\t\t\t\t\tAS Wotani SPII full power kit (S. Inazuma1200)\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t\t\t
    AS\u30a6\u30aa\u30bf\u30cb<\/div>\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t
    \n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\"\"\n\t\t\t\t\t\t\t\u53e3\u30b3\u30df\u3092\u898b\u308b<\/span>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
    \n\t\t\t\t\t
    \n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\tAmazon\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t
    \n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\tRakuten\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t
    \n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\tYahoo!\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t
    \n\t\t\t\t\t\"\"\n\t\t\t\t\t\u30dd\u30c1\u30c3\u30d7<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\n\n\n

    Making a REV mounting bracket. <\/h2>\n\n\n\n
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    \"\"<\/figure>\n<\/div>\n\n\n\n
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    \"\"<\/figure>\n<\/div>\n<\/div>\n\n\n\n

    We decided to mount it like this.
    It’s on the right side when you’re sitting on it!

    <\/p>\n\n\n\n

    \"\"<\/figure>\n\n\n\n

    I did various reverse lookups\u2026
    I’m checking parts lists for newer models with 12\u03c6 breather hoses.

    Probably the GSX-R1000R at around 12\u03c6 for 800 yen, so I’ll order two and lay them out.
    <\/p>\n\n\n\n

    \"\"<\/figure>\n\n\n\n

    Now that the machining setup is done, I’ll keep moving forward with the rest of the work.
    We’re scheduled to open from Wednesday.

    <\/p>\n\n\n\n

    The Ultimate Oil-Cooled Mod: Inazuma 1200 with GSF1200 Carburetor & AS Uotani Ignition. Modification:<\/strong><\/span><\/div>
    \n

    Carburetor Swap:<\/strong> Replaced the stock Keihin CVK32 with the larger Mikuni BST36SS<\/strong> from the GSF1200 (Bandit 1200).<\/p>\n\n\n\n

    Ignition Tuning:<\/strong> Installed the AS Uotani SP2 Full Power Kit<\/strong> to optimize spark timing and energy. Verdict:<\/strong> This combination unlocks the true potential of the engine. The throttle response is sharper, and the torque is massive. It truly feels like a GSF1200 now.<\/p>\n<\/div><\/div>\n\n\n\n

    <\/p>\n\n\n

    <\/div>\n\n\n

    <\/p>\n\n\n\n

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    <\/p>\n<\/div>\n\n\n\n

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