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Post by jimsiercks on May 21, 2020 12:39:21 GMT -5
I am looking to repair the family's old chain saw. I am working with an XL-12 UT number 104453 SN# 372690046.
It has stripped threads for the spark plug. Would you do a Helicoil of replace the head? Someone has misplaced the spark plug and advice on what it should be?
Does anyone have a good used head they would sell?
Any help greatly appreciated.
Jim
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Post by xl130 on May 21, 2020 13:23:58 GMT -5
I would try repairing the threads first if the inside of he cylinder isn’t scored up or damaged other than the spark plug threads. I’ve never actually put helium coils in before personally but I think it’s pretty simple. Leon has a YouTube video of a time he did it. Always nice to watch someone do it before tackling it yourself. youtu.be/6uBv96sOD5s |
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Post by rowdy235 on May 21, 2020 14:03:11 GMT -5
I would also opt for the helicoil over replacement, provided the cylinder is in good shape. The head does not remove on the XL12, the cylinder and head are all one piece. I refer to it as a “jug” but that is probably more of a motor sports term.
Leon’s video is a good one and there’s lots of other good instructional videos on the helicoil process.
If you end up finding any damage to the cylinder, XL12 cylinders are a pretty common piece and can be had relatively inexpensively as well.
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Post by 5terrysupersaws on May 21, 2020 15:34:34 GMT -5
I am looking to repair the family's old chain saw. I am working with an XL-12 UT number 104453 SN# 372690046. It has stripped threads for the spark plug. Would you do a Helicoil of replace the head? Someone has misplaced the spark plug and advice on what it should be? Does anyone have a good used head they would sell? Any help greatly appreciated. Jim I would install a 'thread insert' specifically designed for spark-plug thread repair, such as the Helicoil - "Save a Thread" . The factory/original spark-plug would have been a Champion: CJ8 , in an XL-12 . |
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Post by sweepleader on May 21, 2020 22:48:52 GMT -5
I would agree with the insert vs the coil. The threads are short, not much engagement and both ends of a coil need to be about 1 turn in from the end of the hole. If the ends are longer than that there can be trouble with the coil coming loose or causing problems inside the cylinder. Helicoils are great in most places but I have reservations about using them in plug holes with short reach plugs. The solid insert is a much better choice for that. There are several brands of them that are available, Helicoil brand is just one.
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Post by zombiekiller on Sept 17, 2020 20:22:16 GMT -5
There are aftermarket cylinder/ piston kits you can get for around $130.00 if you are not comfortable trying to patch the threads.
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Post by protocol1 on May 24, 2021 5:11:18 GMT -5
IMO, Installing a "Time-sert" spark plug thread repair insert is a superior way to restore the threads compared to the Heli Coil thread repair method.
If the original spark plug seat seal is a taper, not a metal crush washer seal, with the time sert insert, it will be necessary to use a different spark plug with same electrode configuration and heat range as the original spark plug spec, that uses a metal crush seal instead. If the original plug uses a crush metal gasket, then the OEM spark plug is used.
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