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Where to drill hole for rimlock

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My son has a CRF70F, keeps spinning the tire on the rim, had to replace a tube last ride due to a torn valve stem, so I have a 1.6 rim-lock ready to go. I am assuming that I will drill the hole somewhere opposite of where the rim is welded. Any rhyme or reason as to the best location?

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Opposite the valve stem for best balance, however with a single rim lock the wheel will still be at least 4 oz out of balance.

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Thanks. So I just removed the tire and inspected the rim and the weld is exactly 180 degrees from the valve stem hole, so I will need to offset the rim lock hole slightly...say 160 degrees?

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That would be fine, the rim is gonna be unbalanced no matter what you do. Especially when theres mud on it.

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That would be fine, the rim is gonna be unbalanced no matter what you do. Especially when theres mud on it.

Thanks. I finished the project last evening and everything went well. I used the standard Motion Pro 1.6 rim lock.

http://www.motionpro.com/motorcycle/partno/11-0009/

On such a small wheel, I might have been better off using the marginally lighter Motion Pro "liteloc", but I wasn't thrilled about the cost.

http://www.motionpro.com/motorcycle/partno/11-0058/

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