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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Yz 426 while riding it i went to park it thought it was out of gear and let out on the clutch and it died went to start it back up and the kick start seemed to b stuck so i rocked it back and forth fi


How does the compression feel now that you have it cranking over again. Without the decompression lever pulled in it should be next to impossible to kick it over. also, is there any noise coming from the engine (knocking, etc.) when you got it to start again.

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Hello, I hope you can help. I have a 2009 Kawaski kx250 four stroke. It is VERY hard to kick start and sometimes will not at all. Once it gets running it runs great but if I turn it off (even after it...


There is a proper way to start the engine. Four controls are on your bike to assist in starting. Below are generic instructions.

  • The choke, used when the engine is cold. Pull the red knob for choke.
  • The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
  • The de-compression lever, always used.
  • The throttle, used to prime the cylinder, (power valve).

Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Now release the de-compression lever. Give the throttle a 1/4 turn then let it snap closed. A diaphragm, (Power valve), in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. A flooded engine will often backfire. Now give a strong kick through the full sweep of the kick start lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from the kick lever. This happens in the case of a misfire, aka > backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), for six kicks. After six kicks go ahead and twist the throttle again for a second priming. A good battery, a clean spark plug, a clean carb and clean air filter will also aid in starting. Note that not all carbs have a power valve. When a power valve is not present you should crack the throttle open only 1/8 inch from closed on each kick. Please rate my answer.

Aug 05, 2011 | kawasaki KX 250 F Motorcycles

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Hello I am having problems with my 2004 kawasaki kx 250f. The biggest problem of it all is that I am afraid of running the bike because I do not want to blow a head gasket. When started up the bike...


Starting problems on your bike are usually related to twisting the throttle too often. Remember, the carb has a diaphragm pump in it that gives a shot of gas each time the throttle is twisted. That means the engine can flood quickly if you get happy on the gas. Gently use the kickstart lever to ease the piston just past top center on the compression stroke. Now give a good strong kick. Repeat as needed.

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I have honda unicorn-2005 model. Sometimes kick become free and i am unable to start it. Then i have drive the bike manually in first gear and start it by releasing clutch at substantial speed


first check about the clutch plate, if it is down or not? if it is good then check for the valve of the engine. it need replacement.

Jul 12, 2009 | 2005 Honda Unicorn

1 Answer

Bike is sometimes hard to start.When bike stalls and goes dead,it is hard to start again.This is a 2003 honda crf450.


There is a proper way to start the engine. Four controls are on your bike to assist in starting.
  • The choke, used when the engine is cold. Pull the red knob for choke.
  • The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
  • The de-compression lever, always used.
  • The throttle, used to prime the cylinder.
Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Now release the de-compression lever. Give the throttle a 1/4 turn then let it snap closed. A diaphragm in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. A flooded engine will often backfire. Now give a strong kick through the full sweep of the kick start lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from the kick lever. This happens in the case of a misfire, aka > backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), until the bike starts. A good battery, a clean spark plug, a clean carb and clean air filter will also aid in starting.

Jun 28, 2009 | 2003 Honda CRF 450 R

2 Answers

VERY hard starting takes way to many kicks usually play out befo


There is a proper way to start the engine. Four controls are on your bike to assist in starting.
  • The choke, used when the engine is cold. Pull the red knob for choke.
  • The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
  • The de-compression lever, always used.
  • The throttle, used to prime the cylinder.
Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Release the de-compression lever. Give the throttle a 1/4 turn then let it snap closed. A diaphragm in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. Give a strong kick through the full sweep of the kickstart lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from a backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), until the bike starts. A good battery, a clean spark plug, a clean carb and clean air filter will also aid in starting.

Top rating for this answer? Thanks!

Jun 11, 2009 | 2003 Yamaha YZ 250 F

1 Answer

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Several things can cause the problem. First, spring for a new spark plug. The stock plug is NGK CR8E. Now the plug is eliminated as a problem. Next, pull the slide out of the throat of the carb. Now remove the jet needle. Put the needle clip on the 4th notch, (this is the stock setting). Use only premium gas. Next, follow the starting instructions below.

There is a proper way to start the engine. Four controls are on your bike to assist in starting.
  • The choke, used when the engine is cold. Pull the red knob for choke.
  • The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
  • The de-compression lever, always used.
  • The throttle, used to prime the cylinder.
Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Give the throttle a 1/4 turn then let it snap closed. A diaphragm in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. Release the de-compression lever and give a strong kick through the full sweep of the kick start lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from a backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), until the bike starts. A good battery and clean air filter will also aid in starting.

This will likely tame the beast for you. Please rate this answer. Thanks!

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May 17, 2009 | 2003 Yamaha YZ 250

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