Today I received a set of Tokico 4 pots and have fitted them instead of my 6 pots. After having the 6 pots powder coated I have had several issues, I don't know if the powder coating process has caused the problems, I will be taking the caliper halves to a local machine shop next week to check them out.
I have had problems with the middle sealing O ring, and some sticking pistons, I am starting to think that as they were powder coated as separate halves, perhaps they are now distorted, perhaps they should have been coated as a complete caliper?... hopefully the machine shop will be able to skim each face to correct this issue, that still doesn't correct the sticking piston issue though...will report back next week...hopefully my nice looking blue calipers won't end up as door stops... :facepalm:
The powdercoating process shouldn't have distorted them but I thing they are put together as matched halves.
Maybe you have the wrong halves together.
Any corrosion in the piston bores could be made worse by the heating process so should be cleaned out very thoroughly as well as the bores themselves as that could be the cause of the sticking pistons
Things worth checking anyway as they look amazing.
:cheers:
Did you take the pistons & seals out before they got coated? Considering the heat ruins bearings I'd expect it bugger up the seals & maybe stick them to the pistons.
You can't mix the halves up as there is only one way to fit them as there is only one transfer port, they were totally stripped and bare before the process.
Hopefully I can have the faces skimmed and then look more into the piston issue, I know someone who can check the bores and if need be make up some new pistons.
Saying that, I am happy with the performance of the 4 pots, so at least I'm still on the road :onya:
Cheers guys.
T250..
Wait till your pads are bedded in on your 4 pots..
I wouldnt go back to my 6 pots if you paid me!
My 6 pots were NOT seized and all 6 pistons moved freely by thumb pressure..
But still the 4 pots on my bike are better than the originals.
The temps in they powdercoating process are nowhere near high enough to distort the calipers.
Typically they bake powdercoat at around 200 C.
Calipers are beyond economical repair :facepalm: On the other hand I am well pleased with the way the 4 pots are working :onya:
Quote from: T250 on Friday, 20 July 2018, 06:07 AM
You can't mix the halves up as there is only one way to fit them as there is only one transfer port
You've got two calipers though, so you might have half of each together.
Worth checking before binning them as then they could go on ebay.
I couldn't put them on evilbay as I know they are faulty and I wouldn't want to wish that on someone. I know what needs doing but I'm not going to throw any more money at them, just put it down to a bad experience...I had a bad feeling before I started, but at least the 4 pots are doing a great job :onya:
What is the issue that makes the repair uneconomical? Confirmed that distortion through heat was the cause?
When they coated the halves they also coated the faces where the calipers join, they then blasted off the coating where the transfer port is but this does not seal now, hence the problem. I was quoted today to have the faces skimmed so it would be true, but the cost isn't worth it sadly. In hindsight I should have sent them in as a complete caliper and this would have avoided this issue.
Ahh now it makes sense. Idiots doing the coating then, they should be paying for replacements if they didn't mask it up correctly & were expected to do so.
Guess them powdercoaters are no mechanical engineers. Plenty of shite reported so far.
@T250 Hi Fella Ive refurbished dozens of set of the 6 pots over the years (used to do for a few forums) - if you want to post them up to me Ill see what I can do to put them right for you - I've got the facilities here to pressure check them once had a go at sorting - you cover the postage - no charge my end happy to have a look see for you
Del
Quote from: Andre on Wednesday, 25 July 2018, 04:52 AM
Guess them powdercoaters are no mechanical engineers. Plenty of shite reported so far.
I suppose they are okay for wrought iron gates or something industrial...but more intricate parts cause a load of grief.
As some will know, just look at the trouble on the Triumph forums where T140 OIF's have been powder coated and then the motors are toast due to grit damage...
Quote from: Del on Wednesday, 25 July 2018, 05:23 AM
@T250
Hi Fella Ive refurbished dozens of set of the 6 pots over the years (used to do for a few forums) - if you want to post them up to me Ill see what I can do to put them right for you - I've got the facilities here to pressure check them once had a go at sorting - you cover the postage - no charge my end happy to have a look see for you
Del
Cheers Del that's a very kind offer,
:cheers:
Your the man
@Del I have a friend who could machine them as a last resort to try and repair but nothing is better than someone with experience.
:onya:
Quote from: T250 on Wednesday, 25 July 2018, 06:18 AM
Quote from: Del on Wednesday, 25 July 2018, 05:23 AM
@T250
Hi Fella Ive refurbished dozens of set of the 6 pots over the years (used to do for a few forums) - if you want to post them up to me Ill see what I can do to put them right for you - I've got the facilities here to pressure check them once had a go at sorting - you cover the postage - no charge my end happy to have a look see for you
Del
Cheers Del that's a very kind offer,
:cheers:
Top Man Del as always :)
Arrrgh don't mention that with T140s!
When I first got mine it kept eating oil pumps & turned out to 1/2" of grit in the oil tank.
Quote from: Hooli on Wednesday, 25 July 2018, 06:12 PM
Arrrgh don't mention that with T140s!
When I first got mine it kept eating oil pumps & turned out to 1/2" of grit in the oil tank.
Yup mine was a basket case but unbeknown to me, the frame had been powder coated by a PO...a couple of hundred miles later = total rebuild, pump, oprv, cams, followers, ends, mains, +60 rebore, complete clutch, valves & guides. Even though I pressure cleaned the frame I put a "Charlies" filter in just to be safe after that lot :angry:
Bit late I know, just an update.
Del worked his magic on the calipers :onya: many thanks Del you're a star!
I can now say after fitting the 6 pots back on that have been refurbished, and comparing them to the 4 pots I was using, the 4 pots do have more bite to them, Don't get me wrong, the 6's work very well, but...
(It's been good to be able to compare both, as they have both been refurbished, perhaps I'll find a way to use both and have some 10 pots :happy1:)
Anyway the old chap has now gone in to hibernation so won't come out again for a while...don't know about the bike though... :rofl2:
T250, thanks for input. im sticking with 6 pots but after using bike lately with brembo monos, the difference is just amazing. they just stop at will. have to re asses when getting back on 14, no complaints just a different level of stopping, very different level.