Question about 1973 Yamaha DT 360

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I have a 74 dt360, original with 1100m miles. Engine will start on choke and run a few cycles, then die. Carb is clean, all passages are open. Occasionally, there is a backfire out the exhaust, and then the engine starts on the next kick, but still only runs a few cycles. There seems to be no response to readjusting the lo and mid range air bleeds. There is a good, strong spark.

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Im a little unsure about your lo and mid air bleeds.
It should have an idle speed screw and an idle mixture screw.
The mixture screw should be set around 1 3\4 turns out from the full in position. The idle speed screw should start at a point where it just starts to lift the carb slide.
make sure the air filter element is clean and there is no wasp nest or blockage in the exhaust , as it has obviously not been used much in 36 years. They always needed a pretty good kick to get them started, Will it roll start ? Also I cant remember if that model had a decompressor valve which may have carboned up

Posted on Sep 12, 2010

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1 Answer

Motor will start but I have to manually hold the choke open until it warms up otherwise choke closes on its own


Yes this is the semi automated startup process. If the fuel is bad(old) or the carburetor has residue restricting the fuel passages the engine will run lean requiring some enrichment.(choke) I suspect that the engine may be hunting when warm. Use carburetor cleaner along with a fuel stabilizer.

Check/replace the fuel filter.

Empty fuel tank and purchase some no ethanol from home supply running the engine will assist in cleaning the passages. When engine is running close the choke a fuel times to give the engine a poor mans clean out, Avoid disassemble of the carb with out having technical compliance.(these are delicate and susceptible to contamination).

Never leave fuel in the engine when in storage. Ethanol gums up the fuel passages.

Hope this helps?

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Bike wwould not run today without choke pulled all the way out. yesterday much colder choke only half out then pushed in when warm....bike did sit for 5 yrs. added seafoam and 92 octane fuel yesterday...


You are correct, the mixture needs altering.

Start up with the choke in position were it will start, run a few minutes to warm up engine.

Turn mixture screw all the way in, don't screw hard in (Gentle) could damage screw seating, listen to engine when it starts to faulter gradually turn screw out, listening to the engine sound till she is running smooth on tickover. Reve up quick shut down on throttle, and if setup correctly should return to tick over without stopping. Lucky person.

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Remove the carb, then the float bowl at the bottom of the carb then clean the carb with spray carb cleaner. Spray into each and every drill hole and jet you can find. Use goggles so you don't accidently get cleaner in your eyes. Please, rate my answer, thanks. Reset the air and throttle screws, one and one half turns outward from a lightly seated position. Please, rate my answer. Thanks.

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My suzuki 125 wont start I recharge the batterry and replaced the sparkplug and start during it's on choke but if I return to normal it dies. pls help me


It's a carburated bike. You need to have your carburator cleaned. It's not a difficult job, howver if you are not comfortable with what your doing a shop will charge a half hour or 1 hour o clean it for you on average.

Your carborator mixes your fuel and air. when the bike is at idle it is only getting fuel from the "idle" needle. The smallest needle in the carb. These needles are hollow. As fuel sits in the carburator for a long period of time (over 2 weeks) then the fuel can gum up and clog the neeedle. If it runs when the choke is on but dies when you take it off the choke this is what is happening:

On some bikes a "choke" doesn't actually choke it of fuel, sometimes it actually enrichens it. Your bike is probably set up to open another passage way besides the "idle" needle allowing fuel to go into the engine from another passage. you shut the "choke" off and now it only has the idle needle to get fuel from. If that's clogged the bike dies.

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Will run with full choke on but once i turn choke off it dies


The carb jets are clogged, it will have to be removed and soaked in carb cleaner. Sometimes that will not work either, and the carb will have to be replaced. Reason is, some of the carb passages are as fine as a human hair, so it's hard to get gunk and bad/dried gas deposits out.

You could try running something called Sea Foam (mixed in the gas)from Walmart through the tiller for a while, that MAY help somewhat.

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My lawn mower Troy built B&S 6.50hp/190cc won't stay running.


Actually there is still something blocking the carb jet inside the float bowl or... there is a bit of debris in the fuel air mixture screw / needle jet on the side of the carb. This happens more than you would tend to believe on a rfecently cleaned carb. A piece of loose / floating debris gets sucked into the already cleaned carb and blocks a passage.
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Have changed plug and gas. hard to start but will


I would suggest cleaning the carb (remove it) and air filter. There are a few really small passages in the carb that need to be cleaned which get gummed up due to the 2 stroke mixture and sitting for the winter. (Even if you drained the fuel)

DO NOT use a piece of wire or anything to clean out any small passages. Use carb cleaner and compressed air, put it back on, and see if it's better.

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