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1990 DR350S Dies after about a mile or so

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I have a 1990 DR350S. Just had it shipped from Illinois to NY. It has 1955.0 miles on it. I bought it from the original owner. It will start easily, BUT after about a mile or so it starts coughing and choking. If it sits a min it will light right back up  then do it again a mile or less later. Almost feels like it's starving for fuel. It is a great machine but I need to solve this before I can get out on it!!

ErnieA.jpg

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make sure your petcock filters are not jammed full of crap, and that your carb gets good fuel flow from the tank

Edited by john170950

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I saw in another post that it is a good idea to swap out the petcock for a Yamaha 600 ? Could that cause this issue?

ErnieB.jpg

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8 hours ago, Hodakaguy1A said:

I saw in another post that it is a good idea to swap out the petcock for a Yamaha 600 ? Could that cause this issue?

 

yes. p/n  5LP-24500-01-00. cap off the vacuum port on the carburetor.

Edited by plugeye

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I pulled the fuel line off of the carburetor. In the prime position it seems to flow fine. I would assume if I rode it in " prime " and the problem goes away, that would verify the petcock is bad? I have ordered the Yamaha petcock reguardless

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Update!!!!! I pulled th tank off and started hunting. Intake filters on the petcock were not plugged. I lipped the vacuum hose on the valve and put my vac gun on it AND could get NO vacuum!. Looking carefully  at the vacuum line it is split and deteriorated!! I have the Yamaha petcock on the way so this will be a thing of the past anyway!

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Well, the Yamaha petcock came today! I cant believe it got here so fast. I put the new valve on, capped off the vacuum port and fired it up. While it did help a lot, it still sputters and coughs. It is much better from 0-1/4 throttle. After that it starts breaking up especial if you whack it open quickly. I have not taken the carb apart yet. Any suggestions? Thoughts?

 

Thanks!

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Yep time to take the carb apart.  Like mixgashaulbass said, check the float height, also might as well get a carb kit and rebuild.  If it has seen a lot of ethanol gas you could have some deposits that need to be cleaned up (check the jets), ultrasonic cleaner if you have one, or blast it with carb cleaner. 

 

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Well I finally found the time to take apart the DR35-0S carburetor. You won't believe what I found! Check the attached pictures!! This is EXACTLY as it came apart!

drs1.jpg

drs3.jpg

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2 hours ago, Hodakaguy1A said:

Well I finally found the time to take apart the DR35-0S carburetor. You won't believe what I found! Check the attached pictures!! This is EXACTLY as it came apart!

drs1.jpg

drs3.jpg

Well, there's your problem!  How in the world did that get bent?

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It wasn't bent. It was in the wrong hole. When I went to put it together I found that the washer over the top of the needle was missing. The previous owner said he " cleaned the carb " So it appears he left it out. I machined a washer out of stainless. went for a ride today and it runs GREAT!!

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