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Anyone used a BACKTAP before?
Posted: Mon Nov 06, 2017 2:49 pm
Author: Royalratch
Installing spark plugs in my GPZ750 head recently and the last one went in a bit odd and look like I've damaged the first 1 or 2 threads max.
Obviously don't want to remove the head to re-tap what is hopefully minor damage.
Anyone used a back tap? It;s a Tap that is smaller than the diameter of the hole you're dealing with and expands inside the hole you back it out to re=tap / chase the threads from the inside.
Changed plugs millions of time never had an issue and I'm no gorilla.
R
Re: Anyone used a BACKTAP before?
Posted: Mon Nov 06, 2017 3:31 pm
Author: Julian_Boolean
Not used one, but taking the head off is pretty easy and also gives you a chance to assess the state of your engine.
Re: Anyone used a BACKTAP before?
Posted: Mon Nov 06, 2017 3:53 pm
Author: z1bman
Re: Anyone used a BACKTAP before?
Posted: Mon Nov 06, 2017 4:25 pm
Author: zed1015
Yes! I have used them.
Worth their weight in gold if the first few threads are chewed.
As in the video, use plenty of grease on it to catch any swarf and then spin the motor a few times to blow out the cylinder.
Just be wary to only expand it enough to true the damaged threads and not to open up and slacken the straight ones.
Re: Anyone used a BACKTAP before?
Posted: Mon Nov 06, 2017 4:31 pm
Author: Royalratch
You beauties!
Re: Anyone used a BACKTAP before?
Posted: Tue Nov 07, 2017 3:29 pm
Author: Taffus
every day's a school day, that's pretty cool
Anyone know of a good supplier for these?
Re: Anyone used a BACKTAP before?
Posted: Tue Nov 07, 2017 3:53 pm
Author: zed1015
Taffus wrote:every day's a school day, that's pretty cool
Anyone know of a good supplier for these?
£19.67 delivered - Ebay (Demon Tweeks)
Choice of 12mm or 14mm.
https://www.ebay.co.uk/itm/Sealey-Rever ... JA5sPDZA5g
Re: Anyone used a BACKTAP before?
Posted: Wed Nov 08, 2017 2:31 pm
Author: Royalratch
I was about to order from the USA!
Nice one lads.