Yamaha XS1100 Carb problem

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May 21, 2012, 10:41:59 pm

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[GhostRyder]

         I'm trying to finde a service manual for a 1980 Yam XS1100;        I am trying to fix a friends bike that was sitting for 2 years  & he had carb probs the last time he had it out.  It was not running on all 4 for a while he said & he has had the carbs cleaned out a couple of times over the years.          I helped him work on it to get it running again & I found the two right side carbs had plugged pilot jets so we took of the carbs & cleaned out the bowls & removed all the pilot jets & cleaned them out with carb cleaner & a blower nozzel with 100 psi,   they all were clean & you could blow through them with your mouth.   I cleaned out the bowls realy good & put them back together.  we put them back on the bike & it fired up & wanted to idle on all 4 but as it warmed up a little it started to idle up to about 3 to 4 thousand rpm,  I dhecked out the linkage -ok i sprayed around all the carbs & boots & no change so no vac leaks  i think it is in the idle circut we did not clean out the carb bodys & blow them out could some one plz help me out here?  i'v been wrenching for over 30 years & have never seen one act like this       


    thank you very much for any input on this situation or a possable link to a service manual to download                                                         Phil

[wyiron]

Sounds like you need to syncronize all four carbs. Do you know how?

-Mike

[vamdrup-mc]

Mjello - in addition to syncronizing, you probably want to set idle mix and reset idle.

Regards
vamdrup-mc

[airtime]

Well you have more then problems then carb problems check the vacum advance unit under the left enginer cover or you have a box box going bad more likely the vacum advance breaking down when you rev up moter. I been working on Yamaha's for 35 years for a living and seen this problem many times over the years.

Patrick with many Yamaha's of my own.

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