Cbr6 spat a plug

[kramdra]

I will attempt fixing the threads. Pete, please can you post the helicoil kit?

How do you get the tang off? punch and magnet to fish it out?
How do you hold/drive the tap? is it a hex? cant use a normal tap wrench in the space. I could make a square drive to ratchet spanner adaptor if needed. The space limits me to about 15 degrees of rotation when doing up a plug, painful.


60 miles on the bus was not fun !


Thanks

[kramdra]

One more, when inserting the coil, how do you know when its in to prevent going too far? Could add a shoulder to the insert tool so that it stops on the plug seat.

I read that the insert needs to protrude past the plug threads or carbon buildup will pull the insert out when removing plug.

Is this correct type of kit? www.ebay.co.uk/itm/272924888633

[Pete.]

Tool has a stop.

Cut thread - load insert onto tool - screw in - remove tool - snap tang.

Job done.

Send me your address for maximum satisfaction.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[kramdra]

Bought a cheap helicoil kit from ebay. The tap is good but needed to make up a 7mm square driver, longer inserter tool and punch, but simplest tools you could possibly make. Im aware I could have ground the tap down to 1/4" drive but the one extension I have is too short. Inserts are non magnetic stainless, so using fishing line round the tang to retain it.

I knew Id probably cock up with the insert so I made a couple test pieces. Yes it is easy and no, you can not remove them if it goes wrong. I had one trying to jump threads.

Will attempt on the bike tomorrow.

[kramdra]

Drilled and tapped new thread. Not had time to put the helicoil in.

https://s17.postimg.org/67vex60hb/IMG_20171216_200657.jpg

None of the swarf went into the engine, checked with camera. All stuck to the tap /grease when I put it back in.

[Tankie]

Well done
____________________
Always learning, everyday is a school day

[kramdra]

Not quite. Ive cocked it up. Insert went in ok. Tang broke ok, nothing fell in engine. Should all be good, except plug is a very tight fit and doesnt go more than half way.

I did chop 3 turns off the insert as it was too long. I dressed the end, seems I left a small burr. Took plug out and the first turn from plug peeled off.

However my test peice is also an extremely tight fit and I did not cut this one.
Could stick a plug in lathe and recut a tiny bit smaller...


https://s17.postimg.org/syvrbny1b/171217_135311.jpg

[craigT19]

[kramdra]

After a few more attempts with several old plugs, one went in and I forced it the full 9 turns - I was counting! I did use copper slip but I am skeptical it will come out easily or without atleast damage to the plug. One plug came out with 3 turns stripped. Stuck camera down the intake, can just about see the blurry mess but no coil protruding.

Started her up with the garage door shut, sounds horrible, but after a few seconds realised that is just the exhaust. The plug is fine, she runs.

[kramdra]

https://i.postimg.cc/vZF8YGTm/IMG-20200502-192247.jpg

Two and a bit years later
She caught corona virus a month ago and has not ran since I got recovered home, not even with brake cleaner and hitting the bank angle sensor. I decided to check the plugs.

The plug was extremely tight coming out, and stripped much of the plug thread, but I see I had that before when test fitting. I will get the bore cam back down there to inspect.

Anything I can do, to prevent the stainless insert ruining the plug thread? Or that I should do before I stick a new plug in?

Thanks

[Tankie]

You can get a plug tap ,come thread cleaner to run down the spark plug thread
____________________
Always learning, everyday is a school day

[mentalboy]

[Easy-X]

Just pop the head off and vacuum out all the swarf... you'll be fine
____________________
Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[mentalboy]

[kramdra]

[Tankie]

If the insert is badly fitted,and is tapered it must come out, the thread re cut and a new insert put in
____________________
Always learning, everyday is a school day

[kramdra]

Its not tapered. I suspect either the thread is just galling, because stainless, or the tap in the kit is undersize. I dont see any way of getting it out, without stripping the engine.

[Riejufixing]

I'd be inclined to remove the insert, re-do the threads properly, and put in a new insert.

EDIT: And double-check it's the rigt insert!

[Riejufixing]

[Pete.]

Looking at the state of the plug I'd say that the combustion gases have been getting past the threads and the sealing washer.

I have a M10 x 1.0mm tap I could send you to clean them up.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[kramdra]

Ive got a couple of m10x1 thanks for the offer Pete. The carbon and staining might be burnt copper slip. I will clean up the other 3 threads and replace all of the sealing washers (on my better, spare plugs, they have done half the miles)

It was one of these, m10x1 www.ebay.co.uk/itm/281938550348

I am interested, how can the insert be removed?

[Riejufixing]

[kramdra]

No chance. I made a test peice in aluminium bar with a couple of holes. One of my tests the insert jumped, near the end and no pointy tool could get in there, or at and end to lift it. So the idea of doing that 3 inches down an inaccessable hole..

The "change of pitch" is a trick of the photo, its where the insert and galling ends, pitch is normal.

"New" plugs from 2016.
https://i.postimg.cc/BQdcXFNr/IMG-20200503-144321.jpg

[Riejufixing]

[Pete.]