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Substitute pistons for DT360

10 Jul 2020 13:13
turbodan
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Substitute pistons for DT360 #1
I have whittled the list down to two prospective candidates, I was curious if anyone had tried them. Option number one is the Honda FL350R, bore size and wrist pin diameter is correct. Crown height may be a little higher. The dome height looks pretty close, though I don't have one in hand yet. This one is also intended for an air cooled engine, and I suspect this factors into the taper. Option number two is a Polaris Trail Boss 350, same bore sizes and same wristpin. I believe this is a water cooled engine though.

I see some people using a YZ400 piston but these start at 82mm I believe, would be a shame to bore that much meat out of this thing unless its necessary.

Any thoughts? There are few NOS pistons still available but probably not for long. Might as well solve this issue sooner than later.
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10 Jul 2020 20:05 10 Jul 2020 20:06 by mdscott.
mdscott
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Substitute pistons for DT360 #2
If you find a good replacement you will be forever remembered, we will erect a statue and promise not to tear it down. :ROFLOL
Keep us updated.
I have a DT360, MX360 guys will love you too.

Your next mission, turbodan, should you choose to accept , is to find a substitute for a SC500

Thanks Mark
Roseville, Ca.

'76 Bultaco 143 Frontera
'06 GL1800
'01 KDX220
'68 YG5T 80 Trailmaster
74 DT360
75 Norton
73 CB500K
63 C200
87 PW50
64 McClane Edger
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10 Jul 2020 21:11
turbodan
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Substitute pistons for DT360 #3
I think the SC500 guys are up shit creek. There are 90mm CR500 pistons available, surely someone has looked at those already though. Slim pickins in terms of two stroke pistons at that bore size.

I have the FL350 top end on the way. The only question is if it will require a spacer under the cylinder or some trimming of the skirts. Everything else looks good. I'll know next week.

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10 Jul 2020 21:34 10 Jul 2020 21:37 by Enduronut.
Enduronut
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Substitute pistons for DT360 #4
.

"Necessity is the mother of invention" . . . so I applaud your efforts to search for a suitable replacement. :likey

That said . . . what size, and how many do you want?
For about the same price as a set of Wiseco FL350, you can get whatever Genuine Yamaha set you want from me!
I've been selling dozens of DT360 sets to forum members here for many years now, and still have plenty to go around.

But some day, you're right ... they WILL dry up.

oh btw, I have some SC500 sets as well ... but rest assured, you'll pay the fiddler for those.

.

Control your thoughts . . . or your thoughts will control you!.
You can't accomplish . . . what you haven't dreamed!
Don't aim . . . and you'll hit your target every time!
A wise man knows . . . he isn't!
Failure squared . . . equals success!
The following user(s) Liked this Post MarkT, swm, Swoop56, Snglsmkr, Pedalcrazy, turbodan

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11 Jul 2020 07:55
mdscott
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Substitute pistons for DT360 #5
Yes Enduronut, the SC500 pistons are at a premium. I sold mine a few years back, thank God.

Thanks Mark
Roseville, Ca.

'76 Bultaco 143 Frontera
'06 GL1800
'01 KDX220
'68 YG5T 80 Trailmaster
74 DT360
75 Norton
73 CB500K
63 C200
87 PW50
64 McClane Edger

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15 Jul 2020 21:11
turbodan
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Substitute pistons for DT360 #6
The Honda FL350 piston will require a 4mm thick spacer under the cylinder base and an additional base gasket. A shorter rod would work too. For now, I will make a spacer. Same thing I had to do with my KE250.

The Honda piston does not come with any boost ports in the intake skirt which is actually fine. You can put them where ever you want or leave them out entirely. This opens up some options with porting.

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