Technology - Coated / plated cylinder walls ! - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 25 Old 09-07-2019, 09:15 PM Thread Starter
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Technology - Coated / plated cylinder walls !

So I kind of wondered when or if you needed to have your cylinders bored due to wear,
How would the machine shop redo the plating on the cylinders ?

I know some bikes use a Nicasil coating, for which it's intended purpose is to reduce friction
and generate more power with less wear.

So would this mean that the Vstrom cylinders would have to be replaced and not bored oversize.?

I have never heard anybody talk about having engine work done like this on this forum. ...

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post #2 of 25 Old 09-07-2019, 10:26 PM
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Dirt bikes have their cylinders replated and resized. they been doing it for years.
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post #3 of 25 Old 09-07-2019, 10:44 PM
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There is a lot of confusion regarding this topic. First, it is not altogether clear what year Suzuki's version of Nikasil was used on the DL, SV or SFV bikes. Suzuki called it SCEM for Suzuki Composite Electrochemical Material and might not be the same as Nikasil used in race applications. GW had some comments on this topic and claimed that for some years the marketing specs and blurbs claimed SCEM coating for motors that had iron sleeves which makes it unnecessary so do a site search.

I am looking at doing a top-end and new rings on the front cylinder of a L4 DL650 that has SCEM coating but the bike only has 10K miles. From what I have read the SCEM coating is good for 100K miles barring any scoring damage due to broken rings or leaky injector washing the cylinder wall of oil causing scoring. The cylinders can be bored but you'd have to retreat the surface with Nikasil which would cost $$$$ so nobody does this, they just replace the cylinder. In my case, if I have to do the rings and there is no scoring then I'll just refresh the SCEM surface with an abrasive pad like scotch-brite. The SCEM coating is so thin it cannot be honed like older iron sleeved cylinders.

Take all of this with a grain of salt as I have only just started to research this area in anticipation of the top-end/ring repair on my 'Strom.
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post #4 of 25 Old 09-07-2019, 10:48 PM
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Modern coated cylinders are very durable.

It's very rare to have to replate a cylinder these days. Short of a catastrophic event they don't wear much at all.

You can go through a lot of pistons and rings without having to worry about the bore. Talking about high performance dirt bikes. A street bike won't ever need a new bore from normal use.

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post #5 of 25 Old 09-07-2019, 11:15 PM
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Quote:
Originally Posted by Spec View Post
Modern coated cylinders are very durable.

It's very rare to have to replate a cylinder these days. Short of a catastrophic event they don't wear much at all.

You can go through a lot of pistons and rings without having to worry about the bore. Talking about high performance dirt bikes. A street bike won't ever need a new bore from normal use.
A few years back I blew the head gasket on my ‘84 Toyota pickup with the 22r motor which have plated cylinders, not sure what kind, 350k miles. When I tore it down to do the gasket I mic’d it and the cylinders were almost at Factory spec. Those coatings are incredibly durable.

Last edited by Rides; 09-08-2019 at 05:55 AM.
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post #6 of 25 Old 09-07-2019, 11:24 PM
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In the auto industry there are numerous reports of scored cylinders on plated engines. This is caused by starting plated engines and immediately running full load on the engine. (Ie starting and flooring it right away.) Not good foe any any engine and on plated engines this will score the cylinders.

Note this is not starting the engine and immediately driving/riding away **gently** which is the best way to warm up and engine.

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post #7 of 25 Old 09-08-2019, 03:25 AM
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Quote:
Originally Posted by dmfdmf View Post
There is a lot of confusion regarding this topic. First, it is not altogether clear what year Suzuki's version of Nikasil was used on the DL, SV or SFV bikes. Suzuki called it SCEM for Suzuki Composite Electrochemical Material and might not be the same as Nikasil used in race applications. GW had some comments on this topic and claimed that for some years the marketing specs and blurbs claimed SCEM coating for motors that had iron sleeves which makes it unnecessary so do a site search.

I am looking at doing a top-end and new rings on the front cylinder of a L4 DL650 that has SCEM coating but the bike only has 10K miles. From what I have read the SCEM coating is good for 100K miles barring any scoring damage due to broken rings or leaky injector washing the cylinder wall of oil causing scoring. The cylinders can be bored but you'd have to retreat the surface with Nikasil which would cost $$$$ so nobody does this, they just replace the cylinder. In my case, if I have to do the rings and there is no scoring then I'll just refresh the SCEM surface with an abrasive pad like scotch-brite. The SCEM coating is so thin it cannot be honed like older iron sleeved cylinders.

Take all of this with a grain of salt as I have only just started to research this area in anticipation of the top-end/ring repair on my 'Strom.
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post #8 of 25 Old 09-08-2019, 07:14 AM
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If you need overbore and sleeve or stirp a re-plate millennium plating are the folks to do it.

Strip and re-plate is $225 per cylinder.

Repair and re-plate is $295 per cylinder.
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post #9 of 25 Old 09-08-2019, 10:53 AM
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BMW started using Nikasil in 1980-81. Joke was to re-ring at 100K for max performance.
Never had to and rode through the 100K mark on a few bikes. The '04 Wee has 100K on it now and don't feel any need for engine work. I might have the valves checked though.
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post #10 of 25 Old 09-08-2019, 11:08 AM
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Yep, it's not cheap to fix though. If you want standard bore it's cheaper to get a used good fleabay plated cylinder in good condition. After 2011 for V-stroms. SFV had plated cylinders.

I put oversize SV JE pistons in my DL and it's around $295 to get EACH cylinder bored and replated.

Instead I got iron cylinders bored out for around $65 each.

BUT the plated cylinders are better IMO.

2012 Suzuki DL650AL2, over 45k miles already!

Last edited by D.T.; 09-08-2019 at 11:59 AM.
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