Question about Yamaha 2004 Kodiak 400 Auto 4x4
Yahaha kodiak 400 has engine rattle above idle,I have drained the oil and found some strips of rubber type material came out of the crankcase I then cut open the oil filter and found it contains a considerable amount of metal some magnetic some what looks like alluminium.Could it be from a failed cam chain tensioner,I am lead to beleived these engines rarely give problems if they are maintained correctly and servived regularly.Any help on where to start looking would be greatly appreciated.
Posted by Anonymous on
Going to need to tear into it and have someone rebuild it but something is failing or has failed internally and not able to diagnosis until broken down
Posted on May 30, 2017
Hey.. sounds like you are on the right track..
DO NOT CRANK THIS ATV AGAIN!!
GET IN TOUCH WITH A PROFESSIONAL MECHANIC.
If you are going to do it... remove the engine..its going to have to be totally disassembled to make sure ALL the metal and rubber pieces are COMPLETELY removed. This will also provide you with the evidence for a parts list for replacements parts and pieces as you take it apart..slowly.. Clean parts make for a clean engine.. watch for small oil passages and any little nooks and crannies in the cases that will pack with ground up metal..COMPRESSED AIR and long wooden swabs work wonders.
ps.. replace the cam chain no matter what it looks like!!!!!
Posted on May 30, 2017
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Posted on Jan 02, 2017
This sounds like a classic case of pre-ignition, aka detonation and engine knock. Change to premium gas and put in a set of spark plugs that are one heat range colder than stock. It is good that you are handling this before the engine destroys itself. Yes, destroys itself. That is what pre-ignition will do. Hot carbon deposits ignite the fuel before the spark plug does. This is hard on the rod, main bearings and piston. Beat on the top of a piston with a hammer. That is what your piston will quickly look like with pre-ignition.
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Posted on Apr 23, 2009
There is one screw that adjusts the revs,you can increase the engine revs and it should solve the idling problem.Be careful as there may be one for air mixture which could look similar..make sure you adjust the one for the revs only.If this does not solve your problem then let us know.
Posted on Feb 15, 2010
The presence of a small amount of metal shavings on the magnetic drain plug in the transmission and the primary is not unusual. Large bits of metal could indicate a problem however. But, I doubt seriously that anything to do with primary or transmission is causing your engine to overheat. It's probably overheating due to a too lean fuel air mixture. Go to this site and see what they have to say about this. http://www.nightrider.com/ If you take your bike to a shop that has a dyno and a good mechanic that know what he is doing, they can tell you what you need to do to help with the problem.
Posted on May 23, 2011
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