Question about 2005 Honda Unicorn

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Engine knocking problem,no start even with kick,kick becomes free

Bike runs good but sometimes it does not start and kick becomes free.i find problem in overtaking. bike begins to knock. mechanic are not able to detect. iam very worried. please help me. clutch plate are well in condition. mechanics are predecting that there could be problem in head of the engine.

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  • Anonymous Mar 22, 2014

    My timing chain became noisy after the bike sat for 6 months, prior to storage it was not noisy. Will this self adjust if I ride until the engine becomes hot. I've been worried that the timing chain may break or come off the cog if I ride it.

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This was the same problem what I had with my New Unicorn. I approached the Service Center through Honda customer care, and now got a solution which is not bad. I could meet with a senior service manager and technician there and they really supported me solving this problem. I will brief out the findings and solution here:
Findings:-Engine heating up than normal, Exhaust valve misbehaves at this extreme condition. Air block is happening at the time of exhaust stroke inside the engine.
Solution:-Engine was overheating than normal because of bad/changed valve clearance and improper oil pumping inside the engine. They corrected valve clearance for now and replaced entire oil pump unit inside engine. Replaced rubber mounts on top of both valves. Replaced the clutch lift plate because of bent formed after trying so many kick starts while piston movement was interrupted due to air block.

Posted on Mar 07, 2009

  • meharo Mar 07, 2009

    I forgot to mention the exact symptoms of the problem for which I written a solution.
    Symptoms:
    1.A sudden engine stop and jump-start while running it very smoothly.
    2.It happens usually after or during long drives.
    3. It suddenly appears when you give a sudden throttle open or continuous throttle open for a short period of time.
    4. No knocking sound for me but engine is producing a little hard beat than its normal smooth beat.
    5. Feels a little more friction also while releasing clutch from engine.
    6. Once engine stopped your self will try to start the engine, but no real engine fire.
    7. Kicker is of no use, its free, you can push it down using even your finger.



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Yea it sounds like the compression is down could be the rings or barrel wear or leaking head worst is lower end bearing this is most probable due to the banging noise think engine needs overhaul by a good mechanic

Posted on Jan 19, 2009

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if the bike is old ?? then the cam chain can become over stretched and still slap about no matter how it is tensioned
also likely knock cause would be piston slap which occurs when the piston and cylinder gets bit old in the tooth
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