Question about 1974 Yamaha DT 360

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I have a 1974 DT 360 and I cannot get it to run right. It starts and runs well, but as I ride it, the idle cycles up and down by itself. The longer I ride it, the more pronounce the cycle. The idle cycle revs from 2-5k rpm. My mechanic has checked for air leaks and has replaced both crank seals and has gone through the carburator, yet it still has this issue. Any suggestions????

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  • Master
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This sure sounds like an air leak. I am sure the intake seal and boot from the carb to the cylinder has hardened from heat and old age. It will not look pretty, but I would coat the rubber parts with silicone seal and reassemble. If that doesn't work, check the head and cylinder gaskets for air leaks. Check the oil feed line connection and the feed line also. Air could enter at a loose connection. It is possible the center case haves are not sealing at the crank chamber and the air is entering there. It is a remote chance but that's all I can come up with. Please rate my answer. Thanks.

Posted on Aug 31, 2010

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  • Yamaha Master
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I wud do a compression and an ignition test--however the carb probly needs a rebuild or overhaul-let me know

Posted on Aug 31, 2010

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I have a 1974 dt 250 same as an dt 360 the bike has sat in a barn about 4 yrs it will not start removed and cleaned the gas tank went thur the carb new plug used ignition coil compression about 50 to 75...


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Also check continuity from engine to frame till high-tension coil...
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Oct 31, 2009 | 1974 Yamaha DT 360

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Wiring


Go to the web page link below
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Sep 24, 2009 | 1974 Yamaha DT 360

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Jun 12, 2009 | 1974 Yamaha DT 360

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