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Fun ended abruptly.

22 May 2020 11:13
RT3Sam
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Fun ended abruptly. #1
So yesterday I decided to finally get the ole girl(1973 RT3) out and ride her. I was having a blast! she ran great and I rode her about 14 miles on gravel roads(Grinning ear to ear the whole time) when all of sudden I lost power. Acted like she ran out of gas. So I took her back home (Luckily it happened close to home) to do some trouble shooting.

Gas was good, oil was good, spark was good, compression was good. Now when I try to kick start her, she'll hit(like she's gonna run) and then nothing. Kick again, same thing. I repeated this several times, but she wouldn't run. So now I'm thinking, timing? I dunno know. Keep in mind this is a bone stock bike, with all the same hardware from 1973. I'm guessing its the original build.

Thought I would run it by the experts and see if you guys have any ideas before I start removing parts. I'm bummed because I was looking forward to riding her some this weekend. Any suggestions will be greatly appreciated.

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22 May 2020 12:05
Gr8uncleal
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Fun ended abruptly. #2
That's a shame Sam.

Is fuel getting to the carb ok - no blockage or anything? Is the spark plug wet or dry after you've kicked it over?

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22 May 2020 12:50
darinm
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Fun ended abruptly. #3
You say finally...so going with most obvious first, had it been sitting with ethenated gas in it for a while? May be worth emptying the tank and putting fresh fuel in.

I'd start with this, a carb clean and verifying petcock flow and go from there.

1972 Yamaha CT2 175
1972 Suzuki TS 185 Sierra
2006 Yamaha XT225
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22 May 2020 14:42
Swoop56
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Fun ended abruptly. #4
A check on the ignition timing wouldn't be silly .
The 360's have a reputation for shearing the woodruff key in the magneto .
You'll still have spark , but it won't be at the right timing .
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22 May 2020 15:54
mdscott
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Fun ended abruptly. #5
Swoop56 is my answer also,
it sounds like a positive, for sure, absolutely, and a big maybe.
:Buds

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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22 May 2020 18:08
RT3Sam
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Fun ended abruptly. #6

Swoop56 wrote: A check on the ignition timing wouldn't be silly .
The 360's have a reputation for shearing the woodruff key in the magneto .
You'll still have spark , but it won't be at the right timing .


Ah.... That would make sense. It was running fine and started fine. I'll check that this weekend. Hopefully I can get a new woodruff key somewhere. Thanks!!

Sam

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23 May 2020 00:53
Gr8uncleal
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Fun ended abruptly. #7
Please correct me if I'm wrong chaps, but the woodruff key is only a "locator" and for it to shear, the flywheel magneto must not have been on tight enough.
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23 May 2020 05:54
1971DT250
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Fun ended abruptly. #8

Gr8uncleal wrote: Please correct me if I'm wrong chaps, but the woodruff key is only a "locator" and for it to shear, the flywheel magneto must not have been on tight enough.


Yes and/or the flywheel came loose previously and damaged the end of the crankshaft or inside of the flywheel. This is a taper fit. Needs to be smooth for maximum contact. I use lapping compound to clean up the taper. The flywheel key is there to keep the flywheel aligned to the crankshaft while installing and tightening. I've seen many damaged RT1,2,3 crankshafts. Once they are damaged they are likely to slip again especially while kickstarting and kicking back.

The hours spent riding my Enduros is not deducted from my life span.
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24 May 2020 18:32
RT3Sam
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Fun ended abruptly. #9
Could it be the Condensor? I was talking to a buddy who rides vintage trials on a TY250. He had the samething happen to his bike as what happened to me RT3. Have any of you experienced the ignition condensor going bad and causing this issue?

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24 May 2020 21:22
Swoop56
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Fun ended abruptly. #10
If your condenser had gone bad , you wouldn't have spark , so that's an unlikely scenario .

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