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Old 05-11-2010, 12:11 PM   #1
Quickv4 OP
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To Hone or not to Hone; Chrome-plated Two stroke bore

I was going about replacing the blown base gasket on our Aermacchi/HD SS250 today. When I went to put the cylinder back on the piston, I miss aligned the rings, and snapped the top compression ring. The bike had excellent compression considering the mileage (over 10000 miles estimated), but of course I will need to install new rings.
This means going through the whole "refesh" process, but this has me confused.
It is a chrome-plated aluminum bore, and Im wondering whether I should hone it or not.
I have found in multiple resources that one should use a ball/flex hone to do the job, but im so afraid on wrecking the bore by honing it through the coating, if it is not needed, I will not hone it.

My father already honed this bore once using the above method, will it stand up to another light honing?

The bore has no deep scratches or gouges, except it is taking on a gloss towards the bottom, and the cross-hatch that is still there is not as defined as I think it should be.

Like I said before, the engine had a good 125psi of compression the last time I checked.

So to hone or not with new rings, that is the question!
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Old 05-11-2010, 02:01 PM   #2
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I think I'd just leave it alone..Especially since it's been honed once already.
Just wonk on the thing when you first get it running to get the new rings seated quick.... No high rpms but large throttle openings at lower rpm's.

That'll put a lot of pressure on the new rings and get them seated asap..

Good Luck

John
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Old 05-11-2010, 02:53 PM   #3
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I don't think you want to touch chrome plating with a hone.

My guess would be that the hone marks will last longer than the new rings.

(assuming you don't accidentally hone right through the layer of chrome)
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Old 05-11-2010, 03:04 PM   #4
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Quote:
Originally Posted by Quickv4
I?

The bore has no deep scratches or gouges, except it is taking on a gloss towards the bottom.....
Anything below the top of the highest port doesn't seal combustion chamber compression, so I wouldn't worry about the 'gloss'.
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Old 05-11-2010, 03:05 PM   #5
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You should not hone a chrome plated cylinder. The chrome is harder than your hone.
Also, you risk the hone catching the chrome next to one of the ports and flaking of a big chunk.

And definitely do not use a ball hone on a two smoke, the ball ends will go up in the ports, might ruin only the hone if you're lucky.
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Old 05-11-2010, 06:13 PM   #6
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Quote:
Originally Posted by norton73


You should not hone a chrome plated cylinder. The chrome is harder than your hone.
Also, you risk the hone catching the chrome next to one of the ports and flaking of a big chunk.

And definitely do not use a ball hone on a two smoke, the ball ends will go up in the ports, might ruin only the hone if you're lucky.
+1... Chrome is not to be honed... and the rings must be specific for it, that is, NOT chrome.
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Old 05-12-2010, 09:30 AM   #7
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I thought the HD Italian singles, both 250 and 350 were all 4-stroke. And I'm from that era. Do I need an Alzheimers test? (I had a HD Hummer 165, so I do remember they were 2-strokes.

But I also vote in favor of not touching the bore and put in new rings. Break in with increasingly aggressive and longer rides with equal cool down time between each ride. Ie., ride 5 minutes with off & on heavy throttle but moderate rpms. Cool 5 minutes. Ride 10, cool 10. Ride 20 and cool 20. Ride a normal 30 minute ride, cool it all the way down and call it done. Or something like that.
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Old 05-12-2010, 09:44 AM   #8
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Quote:
Originally Posted by mark1305
I thought the HD Italian singles, both 250 and 350 were all 4-stroke. And I'm from that era. Do I need an Alzheimers test? (I had a HD Hummer 165, so I do remember they were 2-strokes.
Nope, alot of people think they were all the 4 stroke Sprints. Nope, not so, They had the two strokes also, the X90, Z90, SS/SX 125/175/250, Rapido, TX 125.

What we have...



(not mine, this is the one at the Museum)



Sprint 250.....

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Old 05-12-2010, 09:47 AM   #9
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Cool, thanks. The Sprint 250 is the one I remembered with the horizontal cylinder,
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Old 05-12-2010, 11:50 AM   #10
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Lots of bike have chrome (nicasil) bores - Old Suzunki GT550 to name one

DO NOT HONE
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Old 05-12-2010, 03:11 PM   #11
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Are you sure it's a chrome bore? If it has cross hatching, it's not a chrome plated bore, it's either a steel or iron linered bore. I know of no chrome plated cylinder that has cross-hatching, it's usually a pretty smooth surface.
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Old 05-12-2010, 03:16 PM   #12
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Quote:
Originally Posted by YamaGeek
Are you sure it's a chrome bore? If it has cross hatching, it's not a chrome plated bore, it's either a steel or iron linered bore. I know of no chrome plated cylinder that has cross-hatching, it's usually a pretty smooth surface.
Im 100% sure it is a chrome bore.
However, my father honed it in his (and the bikes) younger days. I think your right with the chrome bore being shiny in its unmolested state.
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Old 05-12-2010, 06:41 PM   #13
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Is it the same bike in the second picture you posted? That's definately an cast iron cylinder on that bike. I own a Ducati 250 and it has a steel liner with a heat shrunk aluminum outer cylinder.
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Old 05-12-2010, 07:19 PM   #14
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No, it is a SS250 two stroke, like the orange one in the museum above. Its not a Sprint.

I got some opinions from the Aermacchi guys, including a major parts supplier. They all said also not to hone it.

Looks like I will NOT hone it, and do a lively break-in routine, based on the collective opinions of almost 10 agreeing people.
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Old 05-12-2010, 07:21 PM   #15
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Quote:
Originally Posted by Pigford
Lots of bike have chrome (nicasil) bores - Old Suzunki GT550 to name one

DO NOT HONE
Chrome lined bore is N O T Nikasil!!!! Two totally different animals. Nikasil is a spray welded lining that is then honed to final size. (and can and should be diamond honed when re-ringing)
Chrome is an electroplating of the bore. It has a very smooth surface finish, NOT the cross hatch of iron lining and Nikasil. The rings are specific for that purpose. Chrome lined cylinders existed WAAAYYYYY before the technology to apply Nikasil exised.
Considering them one and the same with interchangable terminology is inaccurate and could cost somebody an engine if they read these posts as gospel.
Carry on.
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