Bolt sizes for engine crankcase (for joining upper / lower cases)
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  1. #1
    Senior Member fillmarr's Avatar
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    Bolt sizes for engine crankcase (for joining upper / lower cases)

    Snapped one, and need to replace. My hardware store didn't have the exact size I needed. I tried posting in the manuals section looking to see that part catalogue but its not working. Sorry guys. I do think this will be a helpful article for others to reference though!

    Here it is from my build thread:
    Bolt sizes for engine crankcase (for joining upper / lower cases)-58eb7f7ee52851ad0f56c4028549cd23.jpg
    Boston, MA. Proud owner of a $700, 1974 Honda CB450 K7 that doesn't run. Looking for advice on getting running and looking sharp. No need for perfection, but trying to show the bike some respect!

  2. #2
    Senior Member dtsmjr8dan's Avatar
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    This fiche lists them with sizes, but for some reason they skipped #8 which is used a few times. You might be able to measure one of yours relative to the ones in that fiche to get the correct size. https://www.cmsnl.com/honda-cb450k7-...8.html#results
    1977 CB750 (acquired project)
    1979 CM400T (rider),
    1979 CM400T (resting)
    1980 CM400T (just picked up in pieces)
    1981 CM400T (in surgery receiving transplant)
    1982 CM450 (donor engine for 81)
    1982 CB450 (parts bike)
    1985 VT1100C (rider)

    Past rides: Vincents, Triumph, BSA's, Suzuki's, Twingle, Corgy, others.

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  3. #3
    Senior Member fillmarr's Avatar
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    After some poking around at the hardware store, I determined the correct size and ordered from the BoltDeport.com. They have the metric bolts you need and you can order in as small a quantity as you want. Only option was stainless steel, but as advised I just lightly coated under the head/washer (they didn't have flange bolts) with anti seize. Same story with the threads....anti seize to slow corrosion.

    The *thinner* crank case bolts were all of varying lengths but of the "m6 x 1.0" variety. The bolts are slightly longer nowadays but will still fit.
    Boston, MA. Proud owner of a $700, 1974 Honda CB450 K7 that doesn't run. Looking for advice on getting running and looking sharp. No need for perfection, but trying to show the bike some respect!

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  5. #4
    Senior Member Gixxer-18's Avatar
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    Hi Fillmarr this fiche has the bolt sizes you were looking for:
    Bolt sizes for engine crankcase (for joining upper / lower cases)-img_2446.jpg
    Bolt sizes for engine crankcase (for joining upper / lower cases)-img_2445.jpg
    Good luck with the rebuild!
    Nigel.
    2002 GSXR1000
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    1972 A100 Suzuki
    1957 T100

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