Question about 2005 Honda Unicorn
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.
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
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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Posted on Jan 02, 2017
Tips for a great answer:
May 05, 2014 | 2003 Yamaha YZ 125
Mar 02, 2013 | kawasaki KDX 125 Motorcycles
is a proper way to start the engine. Four controls are on your bike to assist
in starting. Below are generic instructions.
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.
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