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  • #1

    compression losing-Engine not starting

    Hello friends......Do you know how much compression is required for unicorn engine?. My mechanic has analog & digital compression meter.
    Because my compression is getting lose sometime & bike is not able to start at all; kick goes down very soft & starter also not useful to start the engine. Then normally I put 5-10ml oil in combustion chamber through spark plug hole by removing spark plug. I know this is temporary solution to start the engine. What to do to solve this compression losing fault.I have replaced both valves to solve this; but no use. After 3k-4k km again i found same problem. My block-piston is also brand new right now!1. My mechanic told me that 70% unicorn users has this problem.
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  • #2
    Re: compression losing-Engine not starting

    Query Approved​
    Biking is not about what you have between your legs, its all about how well you use it!!!!!!!

    Give your details here if you want to help your fellow xBhpian stranded in your city

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    • #3
      Re: compression losing-Engine not starting

      your mechanic is lying, if 70% of unicorns are having same problems, how come this bike is so successful in market. total crap.

      its time to change your mechanic or service center.

      surprisingly, compression ratio is not mentioned on the honda website.

      it is mentioned in your bike's user manual. additionally you can ask for the service manual at your service center and check in that.

      i think it should be between 9:1 to 10:1
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      • #4
        Re: compression losing-Engine not starting

        Xtreme and hunk have c.r of 9.1 . Failed piston rings,busted bore and leaky valves result in compression loss. Get that engine checked soon or engine will go kaput completely

        ----consecutive posts auto-merged-----

        Xtreme and hunk have c.r of 9.1 . Failed piston rings,busted bore and leaky valves result in compression loss. Get that engine checked soon or engine will go kaput completely
        Carb Tuning made easy (Thanks Sibun !)

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        • #5
          Re: compression losing-Engine not starting

          @thread starter- Yes, your mechanic is right, most of the unicorns have this problem. Even near my mechanic many unicorns come with same problem. Solution is not in bore kit or new valves but in new valve guides. Most of the unicorns valve guides wear out prematurely causing the problem of sudden compression loss. Change the valve guide and polish the valves, your problems will vanish.
          Photo of my joy- http://www.xbhp.com/talkies/854067-post963.html-3.88 lac km cont....Ownership review of my joy- http://www.xbhp.com/talkies/832255-post608.html- slowly updating as and when getting time. HERO HONDA CBZ EXTREME(2011) - 47K KM AND COUNTINGhttp://www.xbhp.com/talkies/motorcyc...tml#post904152-carb tuning guide

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          • #6
            Re: compression losing-Engine not starting

            Originally posted by Amit CBF150 View Post
            Hello friends......Do you know how much compression is required for unicorn engine?. My mechanic has analog & digital compression meter.
            Because my compression is getting lose sometime & bike is not able to start at all; kick goes down very soft & starter also not useful to start the engine. Then normally I put 5-10ml oil in combustion chamber through spark plug hole by removing spark plug. I know this is temporary solution to start the engine. What to do to solve this compression losing fault.I have replaced both valves to solve this; but no use. After 3k-4k km again i found same problem. My block-piston is also brand new right now!1. My mechanic told me that 70% unicorn users has this problem.
            The mechanic is lying, my Honda Unicorn has covered above 44000 kms and there is no such problem till date. . . Find a good mechanic. . . and can you briefly tell me the problem so I can help you out and also refer this website for the causes of compression losing in engine What Causes Engine Compression Loss? | eHow.com hope it'll help you. . .

            Cheers!!!
            Yamaha Rx135 - 2005 - 2007 (stolen :mad:)
            Scooty Pep - 2008 - 2012 (sold)
            Honda Unicorn - 2012 - 2015 (crashed)
            Hero Honda Splendor+ 2015 - present (temporary ride)
            Bajaj Pulsar AS200 - 16th September 2015 - present ride

            10 years into riding :D
             Live2Race. . .

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