Question about 1981 Yamaha XS 400 Special

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Lose power, backfires, stalls, pull choke out it will start and run for awhile, the next day it runs like no ones business, I do not understand 1981 yamaha 400 special II

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Clean the carbs, could also be something in the fueltank, also remove and clean the fuel tap.
When it stops next time turn the fuel tap to PRI, in case the fuel tap need a kit.
also open the tank cap to see if it has vacumn, the vent may be blocked

Posted on Apr 24, 2010

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Posted on Jan 02, 2017

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Vote for me if this helps, thanks.

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Last time I STARTED MY VSTAR 1100 I CHOKED IT FOR 10 SECONDS ON HIGH THEN MOVED TO MEDIUM CHOKE FOR 4 THEN TOOK OFF AT NO CHOKE. 2 WEEKS LATER. I started up bike Choke on high bike barely wanted to idle...


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