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Thread: 2008 Honda UniCorn Block Piston Probelm

  1. #11
    Addicted sudip_talukdar's Avatar
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    Default Re: 2008 Honda UniCorn Block Piston Probelm

    Quote Originally Posted by RohIIT View Post
    I have exact same bike as yours, even same color. Cost for top end rebuild will be est 5k maybe 1k more if something pops up. You said you are not feeling low compression but smoke from exhaust tells oil has been seeping in to chamber for atleast 1-2k kms. So best will be to change entire bore kit and if possible clutch plates too as old ones will slip with newly developed power . One can do all these within 4-5 hours and SVC should be avoided at any costs. Try finding a mechanic competent enough to do all this .
    Yup! Looking for a reliable mechanic...and would like to see ur bike too..

  2. #12
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    Default Re: 2008 Honda UniCorn Block Piston Problem

    As regular I went to market today morning to get some grocery; on my way to coming back I found that the speedo is not working & the needle is at 0.
    Well, it is not even one week that I changed the cable from ASC; this time I did not made the mistake to go to the Honda ASC.
    I contacted one of my friends; he suggested me; a good mechanic near my home. I went to him and told him the problem. He took the cable out from the front wheel and then removed the front part, (The other end was connected to the console.) what I saw was really frustrating,the cable which is inside the rubber insulation is totally worn out; I dont understand what the ASC did. and that is the main reason of the tickling/shaking of the speedo to.
    Further he only changed the cable inside costs only 22 and gave him RS. 20 for fitting.. The speedo problem have solved.
    told him about the block piston problem too. He told that as there is not much smoke now, only the RING CHANGE will do. he estimated not more than 2K.
    Last edited by sudip_talukdar; 11-28-2015 at 12:11 AM.

  3. #13
    Moderator Divya Sharan's Avatar
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    Default Re: 2008 Honda UniCorn Block Piston Problem

    Quote Originally Posted by sudip_talukdar View Post
    He told that as there is not much smoke now, only the RING CHANGE will do. he estimated not more than 2K.
    2k just for ring change? Are Honda spares that costly?

  4. #14
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    Default Re: 2008 Honda UniCorn Block Piston Probelm

    I don't know...must be they have included something more.

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    Default Re: 2008 Honda UniCorn Block Piston Probelm

    Quote Originally Posted by RohIIT View Post
    To be on safe side i would recommend changing both block and rings as a set . If possible lap valves and clean head as engine will be stripped , change valve guide as unicorn has tumorous compression leak issue due to that . If possible buy hero block it not honda one. @sibun can you tell which one will fit in unicorn ? There is one for achiever and one for xtreme . Both are 149cc but are different.

    I have same bike and just at 24k i am getting . Honda bore kit doesnt last any more than 60-70k even though you take utmost care of the engine.
    I also own a Honda Unicorn, can you tell me what exactly are these "symptoms of low compression" you speak of? My bike has done 14K kms, any tips for me so that I can keep it running smoothly for long.

    Also, what are the service intervals of a Unicorn?

  6. #16
    Rusted RohIIT's Avatar
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    Default Re: 2008 Honda UniCorn Block Piston Probelm

    Quote Originally Posted by metallica84 View Post
    I also own a Honda Unicorn, can you tell me what exactly are these "symptoms of low compression" you speak of? My bike has done 14K kms, any tips for me so that I can keep it running smoothly for long.

    Also, what are the service intervals of a Unicorn?
    Power loss is the most evident symptom. Followed by oil consumption at early stages.
    Then comes the pressure on kick , if becomes easy to kick or pressure felt is less then , then compressed air fuel mixture is leaking from somewhere.

    Follow whats stated in manual for uni, this is not my owned bike so i dont know much about intervals, i have similar engine Xtreme which has interval around 5-6K kms.

  7. #17
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    Default Re: 2008 Honda UniCorn Block Piston Probelm

    Ok..so, chnage the piston from a local shop for 1800 only!😊
    Now no black smoke no power loss.
    Unicorn zindabaad☺

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