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Virago 750

Rebuilt the carb, now bike runs like crap unless the choke is slightly engaged. Why?

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  • Contributor
  • 40 Answers

Your Air/Fuel Mixture is wrong.. Your carb is getting too much air and not enough fuel. Have you adjusted the jet screw setting? Does it have one?

Posted on Jul 20, 2013

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Posted on Jan 02, 2017

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  • 53 Answers

SOURCE: rebuilt carbs-starts and idles but wont rev up without choke on

sounds like the main jets are partly pluged, you must remve all brass jets and seats including needle jet and its slide soak in carb cleaner and blow out with compressed air only.. hold up to bright light to verify if all are clean. jim

Posted on Mar 29, 2009

freetek
  • 5568 Answers

SOURCE: bike wont run when choke is at half way setting

Sounds a lot like fouled fuel jets in your carb; you may have a little work to do.
If the jets do not allow sufficient fuel to pass, using the choke can 'cheat' the carburetor by restricting the flow of air and restoring the fuel-air ratio. You can't ignore this problem since the 'cheated' condition does not let the engine develop the power for which it was designed.    

Posted on Apr 26, 2009

Benimur
  • 6966 Answers

SOURCE: 1979 suski 750,bike runs on 2 left side cylinders,

Hi and welcome to FixYa,

With the indulgence of craigjamesbt...

A few additional ideas to consider:

  • it would be an electrical/ignition issue if 1 & 4 or 2 & 3 will not fire but not 3 & 4;
  • almost always, raw fuel on exhaust indicates a flooded engine. A flooded engine would most likely be a carb issue;
  • best way to determine if it is an engine concern is to do a compression test;
  • a way to test the right carb pair is to deliberately starve them of fuel by temporarily plugging/blocking the inlet port/seat with rubber similar in appearance as to those used for glue gun, not installing the needle and float. Assemble the carb and install. Start the bike and use/spray carb cleaner on the right side carb. Note if 3 & 4 will fire even intermittently.
Would appreciate a postback on results/updates on any developments.

Good luck and thank you for using FixYa.

Posted on Apr 27, 2009

rockitman187
  • 2559 Answers

SOURCE: Bike only runs when choke is on

The carb jets are partially clogged and you need to clean the carb on the inside and out.

Posted on May 09, 2009

a00gha
  • 21 Answers

SOURCE: not sure why my bike wont start

How long did the bike set un-used? After years, gasoline turns into varnish after evaporation of the aromatic hydrocarbons. I've actually seen a substance like molasses in all the carbs and the gas tank. Take a bowl off of a carb and see what you find. If it has gone to varnish, you will need to disassemble every component that gasoline touches as a liquid and re-build and clean out the gunk. (yes, gas tank too and the diverter valve) This is a common problem.

Posted on May 20, 2009

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