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650 ural misfire

650 ural misfire

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#1 Ianroy

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Posted 04 May 2016 - 12:53 AM

Hi, my 650 ural looses power as soon as it reaches 60mph. It just misfires and looses power. If i stop for a few mins it recovers and is fine until i reach speed again. I thought fuel starvation so cleaned petcock filters, and carbs to make no diference, i changed plugs and checked timing, no good it just cannot keep its speed please help thanx

#2 luca.stere

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Posted 04 May 2016 - 01:31 AM

Probably, just probably, you have a poor gas/air ratio and the engine start to overheat and is loosing power. Check the color of the sparkplugs, if it is white that could be the problem.

#3 lobofuego

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Posted 04 May 2016 - 05:22 AM

Could be running weak overall, could try insulating carbs, and even consider changing them, as newer ones are better, and cheap enough!!!

#4 racepres

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Posted 04 May 2016 - 08:08 AM

Replace the Condenser. Old known good Trumps "new".

Also..Running stock coil?  Run without cover, if it helps, replace coil [I use an H-D one].

Edit, If it is a Carb problem, it is Heat related, Adding an insulating [phenolic] block will help. My Stockers are Fine.

#5 Vance Blosser

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Posted 04 May 2016 - 07:27 PM

Check the fuel flow through the petcock. Modern gas makes the rubber inside swell, choking off the gas flow. This will also cause your symptoms. It could also be dirt in the tank clogging things.

#6 quagster

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Posted 04 May 2016 - 11:44 PM

Make sure the tank is venting also.

#7 Ianroy

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Posted 05 May 2016 - 12:18 AM

Thanks for all the help guys! I ran the bike yesterday without the front rotor cover on and the bike kept running at speed! Much better. Further testing today and if I get the same results then a new coil fitted outside the cover might be the answer.
Regards
Ian.





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