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Crankshaft accession screw (plug) size '15 yz450

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Quick, somewhat stupid question...what size? A 10mm Allen head is the biggest I have. I'd rather not get a whole set. Thanks

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Take a bolt with a 12mm head and put 2 nuts on it, jammed together. Use the bolt head as the Allen wrench and put a wrench on the nuts. That has worked well for me.

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You sure it's 12?  On the Gen2 engines it was 14, and the end of the factory spark plug tool would unscrew it. 

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Thanks. I know the bolt trick works well, but I have to go to the hardware store to get which I will do if they don't have the Allen head.

I've read 14 and it looks to be quite a bit larger than the 10 I have. I'll dig out a pair of calipers and measure to be sure.

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