Well worth the purchase price.
Check the thread on the adjacent bolt too. I just had mine helicoiled as it was leaking.
Neither the plug nor the bolt do anything on the TTR.
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In the Riverina.
'73 RD250, '80 XS1100, '81 RD373LC, '96 Tiger 900/sidecar, '02 TTR250, and another XS11 - this time a chain drive Period 5 race bike that may be ready to race eventually.