Powder coating Motor Cycle parts

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Gjanes
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Powder coating Motor Cycle parts

Post by Gjanes » Fri Sep 18, 2020 10:37 pm

I am new to this forum and need some answers

I am powder coating some motor cycle parts. Some of the parts are covers for the engine and transmission. Is it ok to powder coat the inside of these parts. I don't want it to flake off.

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Harleydad
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Re: Powder coating Motor Cycle parts

Post by Harleydad » Fri Sep 18, 2020 11:45 pm

Do not coat the inside. mask it off.
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Jay V
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Re: Powder coating Motor Cycle parts

Post by Jay V » Sat Sep 19, 2020 9:41 am

I agree - never a good idea to coat the inside of any part that is on the inside of the engine.

Kevin
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Re: Powder coating Motor Cycle parts

Post by Kevin » Tue Sep 22, 2020 7:17 am

And even if the inside of the parts are powder coated, if will peel off with the passage of time. The heat generated will not allow it to remain intact for a long duration. And then the entire area will look distasteful with patches of coating coming off.

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Harleydad
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Re: Powder coating Motor Cycle parts

Post by Harleydad » Tue Sep 22, 2020 8:24 pm

Kevin wrote:
Tue Sep 22, 2020 7:17 am
And even if the inside of the parts are powder coated, if will peel off with the passage of time. The heat generated will not allow it to remain intact for a long duration. And then the entire area will look distasteful with patches of coating coming off.
So your saying the outside of cases, jugs, rocker boxes etc will flake off over time? I disagree with that, if it's prepped right and coated right. Harley powder coats all sorts of motor parts at the plant.
I love my country, but fear my Government

"A government big enough to give you everything you want, is big enough to take away everything you have." - Thomas Jefferson

I believe there are more instances of the abridgement of the freedom of the people by gradual and silent encroachments of those in power than by violent and sudden usurpations - James Madison

Kevin
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Re: Powder coating Motor Cycle parts

Post by Kevin » Tue Oct 13, 2020 11:30 pm

Harleydad wrote:
Tue Sep 22, 2020 8:24 pm
Kevin wrote:
Tue Sep 22, 2020 7:17 am
And even if the inside of the parts are powder coated, if will peel off with the passage of time. The heat generated will not allow it to remain intact for a long duration. And then the entire area will look distasteful with patches of coating coming off.
So your saying the outside of cases, jugs, rocker boxes etc will flake off over time? I disagree with that, if it's prepped right and coated right. Harley powder coats all sorts of motor parts at the plant.
At the plant, they have the right sort of equipment and temperature to apply such coats. You might be right but I ain't sure if it will not flake off when done by us with limited equipment at our disposal.

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Harleydad
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Re: Powder coating Motor Cycle parts

Post by Harleydad » Wed Oct 14, 2020 12:03 am

Kevin wrote:
Tue Oct 13, 2020 11:30 pm
Harleydad wrote:
Tue Sep 22, 2020 8:24 pm
Kevin wrote:
Tue Sep 22, 2020 7:17 am
And even if the inside of the parts are powder coated, if will peel off with the passage of time. The heat generated will not allow it to remain intact for a long duration. And then the entire area will look distasteful with patches of coating coming off.
So your saying the outside of cases, jugs, rocker boxes etc will flake off over time? I disagree with that, if it's prepped right and coated right. Harley powder coats all sorts of motor parts at the plant.
At the plant, they have the right sort of equipment and temperature to apply such coats. You might be right but I ain't sure if it will not flake off when done by us with limited equipment at our disposal.
I've done so many I can't count, never an issue, but then my shop was bigger, not out of your garage type stuff.
I love my country, but fear my Government

"A government big enough to give you everything you want, is big enough to take away everything you have." - Thomas Jefferson

I believe there are more instances of the abridgement of the freedom of the people by gradual and silent encroachments of those in power than by violent and sudden usurpations - James Madison

SkinnysRestoration
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Re: Powder coating Motor Cycle parts

Post by SkinnysRestoration » Mon Jan 04, 2021 1:18 pm

This is 80% of my business. Tape it off. They are all correct but I think you were getting a little hung up on the “flaking off” on the inside mention. The reason it was stated was probably two or three fold. A. We’re assuming it’s over spray and therefore will not have much of its own coverage to keep it in place. B. (And this is important) we’re all assuming that you’re not doing any sort of true prep to the inside so between the contamination of what’s already there and (depending on what case we’re talking about) the oils and contaminants that will eventually be there, there will be more issues on that inside surface than the outside. Finally, C. Oils are simply not good... especially very hot oils hitting any kind of paint, over and over again. It might not be a complete recipe for disaster... but it’s nothing I want inside any of my own engines and therefore nothing I want inside any of my customers bikes. I hope this helps, even though it was pretty well handled before I stuck my nose in here. Have a good one guys and just remember that when it comes to motorcycle restoration and powder coating in general. As long as your going for anything more than just rust prevention, focus on perfection and you can only go moderately wrong if you go wrong at all. Hell, even if you’re just going for rust prevention, focus on perfection anyway.

migger49
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Re: Powder coating Motor Cycle parts

Post by migger49 » Mon Feb 22, 2021 1:17 am

It would be cool to see some results of your works.

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Re: Powder coating Motor Cycle parts

Post by o1Marc » Sun Mar 07, 2021 12:33 pm

Harley doesn't mask their parts before coating. Look at a rocker cover that's been coated and you'll see all kinds of over spray on the back side. Coating inside should last as long as coating on the outside if prep was proper.
At the factory they hang and bang, no prep whatsoever. Kevin, do you think they use a powder that cures differently than what we use?

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