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  1. #1

    Join Date
    Sep 2008
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    What size bolts for RIVA head ?

    Trying to get everything rounded up for the install and the 8x35 bolts seem a tad short.

    Riva install instructions state that the included hardware is M8x35mm bolts.http://www.rivamotorsports.com/instructions/ry10028.pdf

    Step 15 states to install the M8x55 head bolts.

    According to yamaha repair manual, and this thread below, they have different size bolts for the stock head.
    http://www.greenhulk.net/forums/show...head+bolt+size

    So what size bolts and what is the best material to get for an engine?

    Stainless? Zinc plated?


  2. #2

    Join Date
    Sep 2008
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    Clarksburg, WV
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    Anyone know? I called RIVA today and the tech couldnt tell me which one it should be.
    He said best way would be to mark on the outside how far they go down in the cylinder and measure stock bolts against stock head and riva head to see how much longer or shorter the bolts need to be from the stock bolts.

    EDIT: I think it is M8x55. Just pulled one of the bolts and it is alot longer than the 8x35 bolts I bought already. Gonna see if fastenal has what i need in stainless tomorrow. Then I will be putting my head on finally this weekend.

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