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Post by oilman on Dec 16, 2012 22:48:42 GMT -5
Hi Guys. I picked up a 1986 TY350 for cheap because..... The piston and cylinder had a melt down. From my reading over the last couple of days this is their Achilles heal. I actually think this is not the stock piston. OEM ones being of unobtanium. I think in this case this is a MX piston from a DT or IT or something and the what caused the melt down may have been the use of chrome rings? Or some one ran it on straight gas. Who knows. But I know there are some keepers of mighty knowledge on this site so I thought I would ask you to share in your grey power with this young pup.
So my question. Can I bore this jug out a MM or so and use a modified 85mm or other size piston? Given that I can find something with all the right stuff. Pin size, deck height etc etc. What I'm not sure about is the jug. Is the steel liner suitable to run a piston in?? And I'm assuming the liner is steel. All out of my realm of knowledge. Anyone has advice?
Also while I'm at it. This bike, as I found it, has reeds and piston skirt ports. Isn't it usually one or the other?
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Post by oilman on Dec 30, 2012 2:13:56 GMT -5
No takers? Has anyone tried having a cylinder bored out and run it without a new chrome plating?
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kawtippin
3rd Gear
What does the triple say? RING DING DING DA DING DA DING DING
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Post by kawtippin on Dec 30, 2012 8:48:12 GMT -5
I think you have a nickisil cylinder. They run these in arctic cat sleds. Thats how know about them. I think it would have to be replated after a rebore. I'm sure the metal they use for these is would be of a softer compound than a non plated cylinder. They are a great idea when there running but a little costly when a rebore and replate are in order. Have you looked for a good used one?
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Post by Curtis on Dec 30, 2012 9:57:56 GMT -5
If its a chrome cylinder. You need the corresponding piston.for.ot. However. If.there are options to have an "iron" piston.then you can get away with just doing an over bore and not re plate the cylinder. There is a place in Quebec called Adrian Bernard (if my mind serves me correct) that offers re plating very cost efficiently.
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Post by Walms on Dec 30, 2012 10:25:21 GMT -5
I suppose the right thing to do would be what Curtis suggests if not cast iron sleeve.
The piston cut can augment or replace the holes in the piston on a Reeded motor... As far as I know.
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Post by Curtis on Dec 30, 2012 12:11:11 GMT -5
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Deleted
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Post by Deleted on Feb 24, 2013 9:51:01 GMT -5
i have used them. You need to send the piston
so they can fit the hole. It will cost you 200
+for the new hole. They don't always need to
go oversize as they skim bore out the old
nikasil/chrome coating. Best to talk to them
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Post by sooperarthur on Feb 24, 2013 11:24:00 GMT -5
Wow, deglaze the cyl yes, but to actually remove material sounds touch and go.
I'd find a piston then ship it and the cyl to a co. Like millennium technologies to be replated.
Nykisil plating is very thin. Chrome is thicker.
Kawasaki actually uses a wire dropped down the center of an unplated cyl, then zaps the "nykisil" wire with a shit ton of electricity to explode it onto the cyl walls. Well at least that's what a Kawi rep told me about 10 years ago.
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Deleted
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Post by Deleted on Jul 3, 2014 7:44:02 GMT -5
Wow, deglaze the cyl yes, but to actually remove material sounds touch and go.  ?? If it needs a skim bore, it will get one Call CV Tech in Quebec. they will set you straight. SkiDoo dealers as well as the Yammi dealer here only use CV Tech. It was them that told me "a skim bore" is needed to remove the chrome, so they can weld the aluminum to fix deep scores before replating. I am not a welder. I'll bet its quite hard to weld aluminum thats contaminated with nickasil or Chrome? If that cylinder isn't already trashed, just go ahead and deglaze it, and you will be replating, guaranteed (800) 518-7220 |
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Post by North on Jul 3, 2014 12:29:52 GMT -5
When we chrome sleeve bearing journals that are toasted, the damaged journal can only be .020" undersize or else we have to put a new shaft in.
We can polish or grind old chrome, however we always need to be at OEM spec for size so we end up rechroming if it's under size.
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Post by autofobe on Jul 3, 2014 13:35:37 GMT -5
All the old racing yamaha's had chrome cylinders (Td1,2 TR2,3 & tz) the cylinders can be over bored but the new piston must be sent in order to chrome back to the right clearance.The rings have a tendency to snag the chrome in the port edges (due to the huge ports in racing engines).Now a days most are nykisiled.
Brad
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Deleted
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Post by Deleted on Aug 1, 2014 5:20:33 GMT -5
All the old racing yamaha's had chrome cylinders (Td1,2 TR2,3 & tz) the cylinders can be over bored but the new piston must be sent in order to chrome back to the right clearance.The rings have a tendency to snag the chrome in the port edges (due to the huge ports in racing engines).Now a days most are nykisiled. Brad sounds like an echo in here? Helloooooooooooooooooooooo..... anyone down there? thanks for the Valuable input Autofobe. Remember a post I did a long time ago about Bridgeports? If on stock bores, don't over bore. Send the cyl's to be plated with stock bore pistons each time and the holes will last virtually forever, on stock pistons. And it will run you nearly 900 dollars each time................ but you triple guys are Loaded!! It's been done, and works on 1st,2nd overs too  |
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Deleted
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Post by Deleted on Aug 4, 2014 6:06:39 GMT -5
Had a triple XLT waverunner replated in Quebec after it dropped it's power valves into the cylinders and it worked out fine, way cheaper than buying OEM jugs. Used Wiseco pistonians with it. There are different coatings for cylinders, older days there was a different coating of chrome but I have seen both new and old coatings flake. The old Bridgestones of the 60s ran chrome.I have seen motocrossers flake modern coatings at exhaust port edges and fu#k up the day too.
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