I'm questioning myself on the proper size tap to re-thread a sparkplug access hole. Seems like the last service may of cross threaded cyl head somewhat. Honda head taking a NGK BPR 6 ES Plug What size Tap/die to cleanup this mess? Course, fine, metric ? MM
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Tap & Die question
- Thread starter Squire
- Start date
MarshallPowerGen
Senior Member
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- Nov 26, 2017
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- Northwestern USA
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- Generator Technician & Equipment Mechanic
Should be a standard 14mm thread, look into a "Spark Plug Thread Chaser". It will push the existing threads in the head back into place versus a tap that will cut past anything out of place.
terex herder
Senior Member
A spark plug tap is a special tap and not a standard metric tap.
bccat
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- Jun 12, 2010
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- Retired millwright,Heavy Equipment Operator
Smear a little grease on the tap, saves the crud from going into the cylinder
sid rust
New Member
telex herder is correct , if you use a standard 14mm x 1.25 pitch thread tap to clean out a spark plug thread it will cut the thread oversize.