440ex vibrating in engine

[allaboutHP]

i just got my 440 back from the local mechanic last week and ive been goin half throttle and today something in the engine started vibrating when the revs were going down, i was sitting there in nuetral when doin this. i have no clue what the hell is wrong but im pretty ticked off. any info. on this would be a big help.

[quadmxracer]

Can you give me more detail as to where and what you may think the sounds coming from and what it is?

[cals400ex]

i would go over your whole bike and make sure you don't have any loose bolts. a loose case saver, engine mount, foot pegs, along with others can cause vibrating.

[allaboutHP]

me and my dad checked all the bolts on the engine, the noise is coming from inside the cylinder,it wasnt doing this 2 days ago, it just started this. u cant even hear anything until u rev the engine up and then when the revs are going back down theres a loud vibration inside it.

[Fred55]

Just a guess but is the cam chain slapping the side when the revs go down and cause it to loosen some?

[cals400ex]

loud ticking inside the engine is many times a stretched timing chain, faulty timing chain tensioner, or a worn rod.

Is there any way that the ticking could be mistaken for a leak in the exaust and the air being sucked back into the pipe during de-celleration is causing it?