smart51
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| posted on 9/7/05 at 06:06 PM |
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R1 Mounting Bolt Sizes
What size are the 2 upper mounting bolts on a 1998 R1 engine? The one is neither M10 nor M10 fine pitch and the other is neither M12 nor 1/2"
UNF.
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hearnia
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| posted on 9/7/05 at 06:17 PM |
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If you mean the socket cap head bolts, the thread is m9 x 1.
They are as rare as rocking horse shit, so I got mine direct from yamaha for about £2.
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ChrisGamlin
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| posted on 9/7/05 at 07:25 PM |
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The ones on my 2003 engine were all M10 fine, so they must be different on earlier engines
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Ferrino
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| posted on 10/7/05 at 12:10 AM |
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M9 doesn't sound right for a mounting bolt - all of mine ('99 R1) are either M10 fine or M12 fine.
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smart51
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| posted on 21/7/05 at 02:53 PM |
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For reference, I've just fitted two M10 x 1.25 mm pitch bolts to one side and one M12 x 1.25 mm pitch bolts to the other.
For the other mountings, I've passed M10 rod through the plain hole and used nylocs at either end.
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Bob C
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| posted on 21/7/05 at 06:41 PM |
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Exactly as per Mr smart51
Bob C - early carb R1
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Ferrino
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| posted on 22/7/05 at 12:30 AM |
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I recently bought a longer M12 bolt for the mounting on the 'front' of the R1 engine (as positioned in a BEC) and it has 8.8 stamped on
it. Should I ideally be going for something of a higher tensile strength?
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