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Post by spaz12 on Dec 10, 2015 20:08:26 GMT -5
Oh, and I don't have a bore gauge, but I do have a new set of rings for it that I'd bought many moons ago so I'll check it with those. Figures though that the damn things are in a box over at my buddies house where I'm working on the little zuma. Ugh
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Post by Corrosion on Dec 10, 2015 20:48:39 GMT -5
The 3-M Scotch-Brite / gray #7448, ultra fine pad's are equivalent of 600WD paper. But do not tend to tear like 600WD paper does.
As far as not-honing. That is a good question. I have been told both way's by people who know what there doing. I hone with the Scotch-Brite, with the gray ultra fine. I have had good results. If they end up bad it is not because of being honed. You find that the Nikasil is gone in a spot, from friction. You remove the aluminum, and then find the nikasil is rubbed off.
If they do not need honing.... Then why are new Nikasil Cylinder always honed.
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Post by spaz12 on Dec 10, 2015 21:01:46 GMT -5
If they do not need honing.... Then why are new Nikasil Cylinder always honed. Good point! |
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Post by FrankenMech on Dec 11, 2015 15:12:16 GMT -5
If they do not need honing.... Then why are new Nikasil Cylinder always honed. Good point! Because the manufacturer knows just how thick the coating is and has made provisions for the amount of material removed in the honing process. The honing process is required to get the cross-hatch finish that is necessary to seat new rings. |
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Post by Corrosion on Dec 11, 2015 15:56:39 GMT -5
Because the manufacturer knows just how thick the coating is and has made provisions for the amount of material removed in the honing process. The honing process is required to get the cross-hatch finish that is necessary to seat new rings. My point exactly: If you do not hone / deglaze, when you re-ring. the rings will not seat properly. honing removes very little when the proper hone & technique is used. Unless you remove the aluminum transfer, the rings & new piston, will be ruined in minutes. So you do the best you can. but if you do not glaze break, the rings have little chance of doing a proper seal. |
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Post by frank50e on Dec 12, 2015 18:28:03 GMT -5
Did someone suggest not honing the cylinder?
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Post by spaz12 on Dec 13, 2015 0:10:11 GMT -5
I'm going to take some scotch bright to it tomorrow. I was gonna try to get to it today, but got dragged into doing something else so I couldn't get to it.
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Post by spaz12 on Dec 13, 2015 23:37:18 GMT -5
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Post by spaz12 on Dec 13, 2015 23:42:37 GMT -5
I'll try it with some 300 grit tomorrow.
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Post by FrankenMech on Dec 14, 2015 23:54:19 GMT -5
I see what looks like lots of scoring.
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Post by spaz12 on Dec 15, 2015 0:05:43 GMT -5
There is scoring in there, no doubt. It's so shallow that it would take a pretty sensitive machine to measure it, but it's still there and I have no idea what is acceptable. Of course my lazy self didn't do anything to it today. I didn't feel like going to the hardware or auto parts store for more sandpaper. Maybe tomorrow lol?
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Post by spaz12 on Dec 15, 2015 0:28:34 GMT -5
ryan_ott has a piston (looks pretty similar to the Rep piston) that I might buy if you guys think that there's even a little chance of it working. I won't trip if it doesn't, so opinions are welcome. I've seen some pretty badly screwed up cylinders run and was amazed, so I'm leaning towards trying it...
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Post by Lucass2T on Dec 15, 2015 4:13:53 GMT -5
You don't have a scooter engine builder over there somewhere? Or a 'small two stroke' specialist?
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Post by 190mech on Dec 15, 2015 4:58:52 GMT -5
Hit it with some 320(wet) and see how it looks..
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Post by spaz12 on Dec 15, 2015 6:25:29 GMT -5
You don't have a scooter engine builder over there somewhere? Or a 'small two stroke' specialist? There might be someone in town, but I'm not paying anyone to work on this because I'm giving it away. I'd thought earlier about sending it in to get re-plated, but I've found out that's so expensive that it would be cheaper to buy a new one. I was just hoping that I could get it good enough that it would run and maybe last for a little while. I also wanted to get a little bit of experience working on it and seeing what would happen. I can tell you now that 2000 grit wet sanding made it really nice and didn't seem to bother it at all. It even got rid of all the discoloration that the oven cleaner and acid did to it. I'll try the 320 and get back to ya'll.  |
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