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Makotosun

RT2, popped a left crank seal?

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RT2, popped a left crank seal? was created by Gr8uncleal

Bike won't start and fresh oil sitting in the inside of the magneto cover - symptoms of a popped crank seal?

On a more positive note, finally got my DT360A running, 6 years or so after I bought it! 

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Thanks.
The following user(s) Liked this Post: MarkT, Snglsmkr, AirborneSilva, Schu, Ht1kid, Sneezles61
08 Aug 2025 10:12 #1

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Replied by Schu on topic RT2, popped a left crank seal?

Those were the exact symptoms on my DT175C for the bad crank seal. Mine didn’t pop out, but it was missing about half of the lip!

Glad to hear you got your DT360A running. They are great bikes.
Schu

CT1B, CT1C, JT1, JT2, CT2, RT3, DT360A, GT80B, DT100B, DT125B, DT175B, DT175C, DT250B, DT400B, Z50

Someday, you'll own some Yamahas
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08 Aug 2025 13:19 #2

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Replied by RT325 on topic RT2, popped a left crank seal?

Na, seal on those never pop out inlike later models & never leak bad enough to stop it running. Might just have a belly full of fuel so push it around with plug out & ign Off. How long since last run?.
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08 Aug 2025 16:09 #3

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Replied by AirborneSilva on topic RT2, popped a left crank seal?

Hope you get it figured out Al, I'm thinking my newly acquired CT2 has a bad seal on stator side too, just ordered one today.
2023 Tenere T7
1976 DT400C
1975 DT400B
1973 RT3
1981 DT175H
1980 GT80
1972 CT2
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08 Aug 2025 16:18 #4

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Replied by Gr8uncleal on topic RT2, popped a left crank seal?

"How long since last run?"

Started and ran at my mechanics after he'd set the timing, but it had probably sat for years before that.

Then sat for a few months in my garage before I got my arse in gear. It then started quite easily and I rode it for 50 or so yards. After that, it didn't want to know.

Pretty sure there shouldn't be oil in there!

Thanks for the replies.

 
08 Aug 2025 23:39 #5

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Replied by RT325 on topic RT2, popped a left crank seal?

Put a clean plug in Uncle. I'm gonna look more stupid than ever if ya find a popped seal.
08 Aug 2025 23:44 #6

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Replied by Gr8uncleal on topic RT2, popped a left crank seal?

Maybe jumping the gun a bit here, but any recommendations, or ones to avoid, for an aftermarket replacement. Also, any tips on fitting.

Thanks.
09 Aug 2025 08:09 #7

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Replied by MarkT on topic RT2, popped a left crank seal?

These sets show up on ebay every once in a while and have OEM brand quality crank seals...  the whole set is usually around $35 USD.

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Oil in the ignition cavity probably means you need a seal.  Not too likely seal came out as Yamaha got smart and designed the stator plate to be close enough to do double duty as a seal retainer.


 
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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09 Aug 2025 10:11 #8

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Replied by Gr8uncleal on topic RT2, popped a left crank seal?

Thanks Mark.

Is that seal leaking an obvious cause of my non starting issue?
09 Aug 2025 10:16 #9

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Replied by AirborneSilva on topic RT2, popped a left crank seal?

Take this for what it's worth but I think it unless it was really blown out it would still start but like mine wont idle under 2K RPM, which has me thinking it's the seal on stator side.  But again I'd wait for Marks comment before taking my thought into consideration 

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2023 Tenere T7
1976 DT400C
1975 DT400B
1973 RT3
1981 DT175H
1980 GT80
1972 CT2
09 Aug 2025 10:38 #10

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