Harpic for yer Headers.

Japcati · #1 31st March 2017, 08:53 PM

Supposedly it works a treat......

Paranoid android · #2 31st March 2017, 08:58 PM

Christ !!

eyore · #3 31st March 2017, 09:06 PM

Surely ta god there is something really expensive you can buy from a bike shop in Timbaktu?

addicted to rage · #4 31st March 2017, 09:06 PM

seems to work well ... has to be a downside

jellikit · #5 31st March 2017, 09:37 PM

Originally Posted by addicted to rage

seems to work well ... has to be a downside

Harpic has a lot of hydrochloric acid in it. I'd say it would fuck up a stainless system in no time.

Vjmc.Cork · #6 31st March 2017, 09:56 PM

Originally Posted by jellikit

Harpic has a lot of hydrochloric acid in it. I'd say it would fuck up a stainless system in no time.

Be alright for tarting up a yoke you're selling but I wouldn't use it too often

Japcati · #7 31st March 2017, 10:15 PM

Originally Posted by Vjmc.Cork

Be alright for tarting up a yoke you're selling but I wouldn't use it too often

What would be good for bring old dirty headers back to new looking again then?

iano · #8 31st March 2017, 10:20 PM

Elbow grease. ...

Yoda1965 · #9 31st March 2017, 10:26 PM

Wow, great stuff :)

nednedned · #10 31st March 2017, 10:28 PM

Looks like he doesn't clean it too often. Wd40 keeps mine clean.

moose loose aboot the hoose · #11 31st March 2017, 11:30 PM

Use it once then the wd40 from then on

jp biker · #12 1st April 2017, 12:28 PM

Originally Posted by iano

Elbow grease. ...

get somebody too do it for you

proto · #13 1st April 2017, 02:17 PM

Harpic (ph 4) is about 10 times less acidic than lemon/vinegar (ph 3) (http://rb-msds.com.au/uploadedFiles/...%20SD%20AU.pdf)

It will give off gas & eats away at the metal

eyore · #14 1st April 2017, 03:10 PM

Originally Posted by iano

Elbow grease. ...

I suppose Crossans sell it.

sidecarwillie · #15 1st April 2017, 09:52 PM

Originally Posted by eyore

I suppose Crossans sell it.

They do, its on the shelf beside the large tins of compression.

BigDiggity · #16 7th February 2018, 07:08 AM

Lads just a quick question on this,

The active ingredient in Harpic is Hydrochloric Acid, one thing about Hydrochloric acid is that it continues to "work" (ie, eat into the metal) after being rinsed and dried off.

Apparently heat can slow it down or stop it which is handy as it'll be used on a header pipe.

I'm planning to use this on my header pipe today and straight afterwards going to blast a load of ACF-50 on it and run the engine for a few mins this evening to heat it up...

Anyone had any negative results or experiences using this shit on header pipes a few weeks after?

cracker boy · #17 7th February 2018, 09:36 AM

No bad results.

It works fine

cracker boy · #18 7th February 2018, 09:38 AM

Originally Posted by BigDiggity

Lads just a quick question on this,

The active ingredient in Harpic is Hydrochloric Acid, one thing about Hydrochloric acid is that it continues to "work" (ie, eat into the metal) after being rinsed and dried off.

Apparently heat can slow it down or stop it which is handy as it'll be used on a header pipe.

I'm planning to use this on my header pipe today and straight afterwards going to blast a load of ACF-50 on it and run the engine for a few mins this evening to heat it up...

Anyone had any negative results or experiences using this shit on header pipes a few weeks after?

If you want, you can practice on mine!!

BigDiggity · #19 7th February 2018, 10:09 AM

Originally Posted by cracker boy

No bad results.

It works fine

Cheers, already started, first snag, one of the header bolts is seized. Liberally applied acf50 and will leave it for a few hours.

RTV · #20 7th February 2018, 10:38 AM

Yup, I've seen this practices over the years and never heard of any secondary effects.

Haven't tried it myself but tons of vids out there showing what seems to be "magic" pretty much :P