Spark Plug Thread Repair Kit Suggestions?

l008com

l008com

Well-Known Member
Last Fall, I was winterising my equipment and I accidentally stripped the spark plug hole on my yard vacuum. Its a 31 year old machine and I didn't turn that hard, so its probably a failure that has been inching its way to happening for a while.

But no worries, this is a great opportunity for me to make a video about repairing stripped spark plug holes with helicoil type repairs. I used one of those to fix the brake rotor mount on my mountain bike and it worked great.

So the question is, does anyone have any specific suggestions for a specific kit (with links) that is good and that has everything you need in one kit. Including the drill bit UNLESS its a standard size bit. But I don't think it it, its probably bigger than 1/2" right? So the bit, the coil, the install tool, the thread tap etc.

I know I could also repair this by just replacing the head. But I'm making a video out of it so I really want to use a repair kit rather than a replacement head.
 
Here are two suggestions I have in my toolbox. Depending on how bad the thread are botched, will dictate which tool you need. If you purchase a kit, make sure it contains the proper length insert.

www.summitracing.com

Powerbuilt Tools 640811 Powerbuilt Back-Tap Spark Plug Thread Repair Tools | Summit Racing

Free Shipping - Powerbuilt Back-Tap Spark Plug Thread Repair Tools with qualifying orders of $109. Shop Thread Repair Kits at Summit Racing.
www.summitracing.com www.summitracing.com

You can google search “spark plug thread repair kit” to find a kit which best meets your needs. Drill size I use is .500”.
 
l008com said:
Last Fall, I was winterising my equipment and I accidentally stripped the spark plug hole on my yard vacuum. Its a 31 year old machine and I didn't turn that hard, so its probably a failure that has been inching its way to happening for a while.

But no worries, this is a great opportunity for me to make a video about repairing stripped spark plug holes with helicoil type repairs. I used one of those to fix the brake rotor mount on my mountain bike and it worked great.

So the question is, does anyone have any specific suggestions for a specific kit (with links) that is good and that has everything you need in one kit. Including the drill bit UNLESS its a standard size bit. But I don't think it it, its probably bigger than 1/2" right? So the bit, the coil, the install tool, the thread tap etc.

I know I could also repair this by just replacing the head. But I'm making a video out of it so I really want to use a repair kit rather than a replacement head.
Click to expand...
Many times when removing spark plugs from customer engines, I find the plugs to be too loose. I think they are afraid of stripping it. Anyway, I have two engines with stripped spark plug threads and one engine with stripped carburetor bolt threads I will work on this winter. Occasionally people call about spark plug thread repair, but I don’t offer this option. Helicoil is a popular brand and holds up.
 
I've only used a helicoil once on an MTB brake caliper and it works really good. The only issue was that it was really hard to keep the tap perpendicular to the hole I was trying to thread. But I did get it eventually, thankfully. These carbon fiber frames are not cheap! But the way spark plug taps work, it should be even easier to do it right.

Now necessary is the thread sealer though? Wouldn't the kits come with it if it was really necessary?
 
Honest Abe said:
spark plug helicoil repair kit

Powerbuilt® Spark Plug Thread Repair Kit, 14mm - 0000006241 - Runnings

Re-threads damaged 14mm spark plug holes in aluminum heads. Set includes tap and 4 inserts with the following reach: 7/16 (2), 5/8" (1), and 13/16" (1)."
www.runnings.com www.runnings.com
Click to expand...
Well those are hard to get started and causes a loose fitting. They are supposed to self feed but don't. I recently tried one on the Poulan with a strip plug hole. Almost never got it started and then kept wobbling around.

It is best to use a regular Heli Coil but those kits are expensive. And mainly only shops can justify the costs.
 
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