Re: 1974 Ski-Doo TNT 340E -- VINTAGE SNOWMOBILE CHAT

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Subject: Re: 1974 Ski-Doo TNT 340E

Author:
rich

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Date Posted: 22:22:36 02/19/09 Thu
In reply to: Jeff 's message, "1974 Ski-Doo TNT 340E" on 18:43:20 02/10/09 Tue

>I have a 1974 Ski-Doo TNT 340E. I spent my entire
>childhood riding this sled and a '74 Elan 250.
>Currently, the Elan is outside (the engine seized). We
>plan on bringing that in soon. Both sleds were sitting
>outside due to lack of snow until last year we brought
>in the TNT and started it up. It ran fine the entire
>winter. This year (about two weeks ago) we cleaned it
>up, charged the battery, and fired it up. It started
>on the electric start just fine and I spent all day
>riding it. I was riding along the side of a road when
>it just died. I tried to start it again, but no use.
>It started twice with the choke on, but as soon as I'd
>push the choke back in and press the throttle, it
>died. We dragged it home and discovered no spark. We
>changed the plugs, and still, no spark. We changed
>some wire clamps (not sure the name.. attached near
>the spark wire). We discussed it with our former
>skidoo mechanic and he thought that it might be the
>points in the condenser. Is it possible? And how can
>we get to that?
It sounds like the carb could be cleaned up,however; the points and condenser are behind the recoil starter. Remove recoil and starter cup. Then Insert length of reciol rope in cylinder so magneto nut and magneto can be removed. (or use special tool if you have one) Check that wire on condenser is still attached. Sometimes the solder breaks off. If so just re-solder. Check your points by looking to see if they are pitted or not flat. They need as much contact with each other as possible to make good spark. Then check/set the gap with a feeler gauge with points open Don't forget to torque magneto nut!

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