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Makotosun

DT250 1974 back from the brink

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Replied by MrBernzo on topic DT250 1974 back from the brink

Does anyone know where I can get the O ring that fits between the expansion chamber and muffler? Yamaha part number 93210-27250. This is no longer available.
Or is there an alternative O ring available? I assume that this would be a heat resistant O ring and a standard O ring would not be suitable?
22 Jan 2018 16:49 #31

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Replied by Makotosun on topic DT250 1974 back from the brink

Those have been unavailable for a long while. I’ve used standard ones which don’t hold up well. Please post if you find a source for heat resistant ones!
IF it isn't one thing, it's another.
23 Jan 2018 07:35 #32

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Replied by MrBernzo on topic DT250 1974 back from the brink


Sounds like a challenge, I'm up for it.
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23 Jan 2018 11:49 #33

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Replied by 2fishkev on topic DT250 1974 back from the brink

I’ve been searching McMaster-Carr online for them. Need some for a Dt125a also. Will post if I find anything.
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23 Jan 2018 17:59 #34

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Replied by MrBernzo on topic DT250 1974 back from the brink

I went to a seal shop today and they advised using a viton O ring, really helpful and seemed to know their stuff. I brought 2 sizes because I was not sure what OD I needed. Ended up using ID 29mm and OD 34mm.
Fits well, only time will tell if it lasts.



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Last edit: 22 Feb 2018 03:29 by Makotosun.
31 Jan 2018 02:12 #35

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Replied by MrBernzo on topic DT250 1974 back from the brink

Still waiting on a front wheel to be delivered to finish off the front end then take it for a test ride. It's been harder to find a front wheel for a reasonable price than I thought it would be.
31 Jan 2018 02:21 #36

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Replied by MrBernzo on topic DT250 1974 back from the brink

Not much going on with this one right now. Just waiting for parts.
I found a good front hub, having spokes made now to lace up a 19" rim.
Waiting for a new wiring harness to be delivered and a new petcock seal.
Looks like I will need a new needle and seat too.
I was hoping this project would move along a bit faster!
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22 Feb 2018 02:58 #37

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Replied by MrBernzo on topic DT250 1974 back from the brink

Got my petcock seal and wiring loom this week.
Should get my front wheel next week. Starting to make some progress
04 Mar 2018 01:59 #38

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Replied by MrBernzo on topic DT250 1974 back from the brink

Rim, spokes and blasted hub have arrived. Time to build a wheel!
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16 Mar 2018 03:09 #39

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Replied by MrBernzo on topic DT250 1974 back from the brink

Not a whole lot of action going on here as I have been of riding my husky on a killer 3 day enduro ride. Today i got the front rim all laced up to the hub. Last week I ordered a 12v kit and ignition switch from rex.
As soon as the parts are in I hope to wire this thing up, then buy some tyres....... then see how she rides!
28 Mar 2018 05:03 #40

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