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Old 08-31-2013, 06:16 PM   #1
Rorschach
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Helicoil: Yay or Nay?

So, I had an incident last week, while riding in the freeway, bike starts doing a nasty sound and felt the power loss immediatly, for a moment, I thought I blew the engine, I was cruising around 70 mph, when I was about to pass a car on my right is when it went kaboom, best description: "Sounds like a tractor, runs like a scooter"

I didn't have the chance to work on here until today saturday, but during the week, I did a little research online and was pretty much convinced it was just a spark plug, common problem on the 929s, so got the spark plugs and opened her up today, it was pretty easy to spot the coil sticking out, no damage to the spark plug's thread so I had high hopes, looked inside for debris or shavings and it was all clean. Up until the moment when we tried to put the new olugs in, apparently, the guy who serviced my bike before, crossed threaded one of the threads and just used the could to prevent the plug to come out, so I have a decision to make now.

I work at a machine shop and we work with helicoils all the time, trustables, but never heard if nobody using them on a car/bike/boat whatever, until I found it online, some people agrees, some other don't, not sure if I should trust or not, I post this just in case there is someone out there who has experience using them or if has known somebody who does, thoughts, ideas, input.

Anything helps and as always, thanks for your comment.
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Old 08-31-2013, 06:29 PM   #2
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Ive never used them but there are used all the time on Ford motors as you stated...


I would use one....u may have to drop the motor to get the tools in there though...
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Old 08-31-2013, 06:39 PM   #3
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Considering you work at a machine shop, do it right and go with time serts. I would avoid using heli coil for spark plugs due to you having to remove your spark plugs often to inspect/replace.
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Old 08-31-2013, 06:40 PM   #4
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Quote:
Originally Posted by cuong-nutz View Post
Considering you work at a machine shop, do it right and go with time serts. I would avoid using heli coil for spark plugs due to you having to remove your spark plugs often to inspect/replace.
Ahhh yes coung is right....Fords use time certs not helicoils.....
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Old 08-31-2013, 06:50 PM   #5
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Don't use a helicoil, go to Olreillys and get the kit to repair spark plug threads.
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Old 08-31-2013, 07:02 PM   #6
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Quote:
Originally Posted by hotcknstrips View Post
Don't use a helicoil, go to Olreillys and get the kit to repair spark plug threads.
I didn't think or recalled this, I'll look into that.
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Old 08-31-2013, 08:09 PM   #7
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Do not use helicoil in a spark plug hole. I personally would not use a time cert either in a high performance applications. They do not spread the heat properly, that plug would run hotter, maybe run a colder plug with a patch repair. . If I had to pull the motor anyway I would weld it and re machine the hole.
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Old 08-31-2013, 09:13 PM   #8
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Quote:
Originally Posted by hotcknstrips View Post
Don't use a helicoil, go to Olreillys and get the kit to repair spark plug threads.
Listen to this man, done it several times
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Old 08-31-2013, 10:20 PM   #9
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Don't see the problem

I can A: do some sort of thread repair & maybe be done If it doesn't work I end up at...........
B: Pull the whole motor out & head off just in case


I choose A every time rather than just skipping to B
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Old 08-31-2013, 11:41 PM   #10
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Quote:
Originally Posted by supadupa View Post
Don't see the problem

I can A: do some sort of thread repair & maybe be done If it doesn't work I end up at...........
B: Pull the whole motor out & head off just in case


I choose A every time rather than just skipping to B
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Old 09-01-2013, 12:57 AM   #11
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lots of videos on youtube about fixing this, I would watch some videos on there first.
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Old 09-01-2013, 01:06 AM   #12
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I haven't had a chance to use them yet but Time Serts are recommended over Helicoils. From what I've seen, it's a much better design.
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Old 09-01-2013, 03:28 AM   #13
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The only thing I don't like about this fix period, be it helicoil or timesert, is metal shavings going into the cylinders...
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Old 09-01-2013, 08:28 AM   #14
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Quote:
Originally Posted by sullivan View Post
The only thing I don't like about this fix period, be it helicoil or timesert, is metal shavings going into the cylinders...
As you are cutting the threads you can put grease on the tap to try to trap the shavings or cut them dry and have the shop vac nozzle right there to suck up the shavings as you cut. I like the second one the best.
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Old 09-01-2013, 03:24 PM   #15
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I appreciate the input guys, I'm thinking about take the head to a shop and have it welded, re do the whole thing. Now a question, does anybody knows about an honest shop where I could take it? Thanks again!
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Old 09-01-2013, 04:11 PM   #16
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Used to do it all the time on the ford 5.4/4.6 (pre 3-valve motors) even a few 6 cyls. never had a comeback.
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