recently got a 03 400ex it runs great but when you start it cold it makes a odd knocking/ticking sound but it does not speed up with rpms. then once its warm it completly goes away. anyone ever had this problem. or have a idea what it could be. dont know any history on bike. not sure when or if valves ever been adjusted,plugs etc. has a k&n with drilled lid, not sure if its jetted, the screws on carb looked tampered with. and the previous owner removed a slip on pipe.

 

is it making the sound when you are idling it or when your moving

 

only at idle. it doesnt speed up with rpm's. and once its warm it goes away completely, until it cools back down
can i just remove the main jet to see what size it is. im curious if its been jetted and dont wanna remove carb just to find out. will it have a number etched in it?

 

You need to check your valve adjustment. If it is not the valves, it is probably the timing chain.

 

Sounds like the valves to me. I would start there then move on to the timing chain.

 

07 400ex mine does it when its really cold.sounds like a spark knock. if it idles just a tad bit higher it doesnt do it.how cold is it outside when it does it.i think on mine it is a combonation of kinda stale gas in the carb and cold weather.and my valves were just checked.no more than 50 hours on quad.if this sounds like it might be same problem i wouldnt worry bout it much. ps try turning your gas off and running the carb empty next time you park it.remember to pump your throttle a few times when you go to start it again.

 

its been about 40 here. 20 at night. yea it runs awesum and the noise disappears once its warmed up.
also i believe its been jetted but arent for sure.carbs screws looked like theyve been tampered with before. has a k&n and had a slip on at one time. i have a lexx slip on, on the way. can i just remove the nut on the bottom of card and access main jet? and will it have a size number etched in it?

 

But if the noise doesn't get faster as RPM's increase, how can it be the valves, timing chain, cam, or anything else related to RPM's????? I think it's something else.

 

<div class="FTQUOTE"><begin quote>Originally posted by: budedm

But if the noise doesn't get faster as RPM's increase, how can it be the valves, timing chain, cam, or anything else related to RPM's????? I think it's something else.</end quote></div>

did you read my reply???

 

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