The Time-Sert 4212-125 spark plug thread repair kit is commonly used on Harley Davidson and other motorcycles.
The Time-Sert 4212-125 kit includes 6 inserts of which (2) 9mm, (2) 15mm and (2) 17.5mm reach.
Additional inserts can be purchased here.
This spark plug thread repair kit is for first time thread repair only.
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Loctite C5-A Anti-Seize Compound for Spark Plug Insertion After Time-Sert Kit Installation - Click Here