Question about 2005 Honda Unicorn

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Backfire after i warm my bike up and push the choke in and when i rev it , the bike will like backfire/misfire, and if i hold the throttle steady it will backfire like 2 times again....and it does this while riding at a steady pace too...it just started it didint do it a week ago. i didnt change anything except a new air filter..fuel screw is 2.5 turns out . the timing, valve clearances and everything is in spec. is this a sympton of it being rich or lean? and it doesnt do it on choke

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  • rahuldantu Feb 16, 2009

    my unicorn's too facing a backfire problem.... initially it used to be in the mornings during my first ride of the day... but nowadays it persists through out the day tht too in all gears......

    apart from this problem the fuel indicator's not working properly..........

    sometimes when in ignition and in neutral it overshoots the right mark, when the tank has as sufficient as 3 litres fuel left, indicator doesent rise at all. its behavior is quite chaotic............

    moreover i face heavy vibrations even at speeds around 80( bike's struggling to cross over 80)............ wht i fear is tht all these symptoms r arising due to one malfunction due to which am losing the spirit of a wing rider......... plz somebody gimme a solution....

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3 Answers

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Check the engine compression. This sounds like a simple valve job would be the fix.

Posted on Mar 12, 2009

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Why u wanna pull da choke wen da engine is warm.?? deres a small screw on da bottomside of carb,open it n drain da carb,might be possible that water particles might hv crept in..i hd da same prblm

Posted on Feb 04, 2009

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Yes, it could (and probably is) be an air leak. Check to be sure the carb is tight in the intake manifold, and make sure the hot-start isn't loose and is sealing properly. Also make sure all of the exhaust system joints are tight, an air leak in the exhaust will make a four-stroke pop and backfire like an old work truck with no muffler...

Posted on Nov 10, 2008

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SOURCE: backfire

Yes, it could (and probably is) be an air leak. Check to be sure the carb is tight in the intake manifold, and make sure the hot-start isn't loose and is sealing properly. Also make sure all of the exhaust system joints are tight, an air leak in the exhaust will make a four-stroke pop and backfire like an old work truck with no muffler...

Posted on Nov 10, 2008

  • 2336 Answers

SOURCE: backfire

Yes, it could (and probably is) be an air leak. Check to be sure the carb is tight in the intake manifold, and make sure the hot-start isn't loose and is sealing properly. Also make sure all of the exhaust system joints are tight, an air leak in the exhaust will make a four-stroke pop and backfire like an old work truck with no muffler...

Posted on Nov 10, 2008

  • 2336 Answers

SOURCE: bike backfire

Yes, it could (and probably is) be an air leak. Check to be sure the carb is tight in the intake manifold, and make sure the hot-start isn't loose and is sealing properly. Also make sure all of the exhaust system joints are tight, an air leak in the exhaust will make a four-stroke pop and backfire like an old work truck with no muffler...

Posted on Nov 10, 2008

  • 2336 Answers

SOURCE: backfire

Yes, it could (and probably is) be an air leak. Check to be sure the carb is tight in the intake manifold, and make sure the hot-start isn't loose and is sealing properly. Also make sure all of the exhaust system joints are tight, an air leak in the exhaust will make a four-stroke pop and backfire like an old work truck with no muffler...

Posted on Nov 10, 2008

  • 2336 Answers

SOURCE: backfire

Yes, it could (and probably is) be an air leak. Check to be sure the carb is tight in the intake manifold, and make sure the hot-start isn't loose and is sealing properly. Also make sure all of the exhaust system joints are tight, an air leak in the exhaust will make a four-stroke pop and backfire like an old work truck with no muffler...

Posted on Nov 10, 2008

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