Maintenance & Technical > KX500 Original

Engine noise

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hughes:
Got my top end up and running today. My bike has been down since jan. Started it today with new top end and notice a rattle up front or in the cylinder. Shut engine down and let it cool restarted and set my idle speed. After two cool down cycles I went for a ride. The noise is still their but I went for a low speed easy through the gears breakin in the top end. Next I removed the pipe and took a pen light to look into the cylinder exhaust side of the piston was great and I could see about 75% of the cylinder and every thing was fine. Made sure i had the copper washer between the pipe and cylinder. Went for another ride and laided the coal to her I made acouple hard pull runs with some cool downs speeds and the noise is still there and it's not getting louder. I have a full tank of fuel ran through the new top end now. It's been 3 months since the last time I rode her but I do not remember this sound. It seems to be at idle only and after I idle back down from a high speed run. Do I need a new copper crush washer at the pipe :?: Or am I smoking crack and this is normal because I tried to kill her but she ran strong. What do ya'll think

hughes:
Just read jdv500 post about engine noise up front (rattle). New o-rings and copper washer fixed his noise. My o-rings are new and springs are good and tight. Copper washer is smashed. What is causing this noise when the copper washer is missing or worn :?:

mikesmith:
The o-rings and washer make a tight seal so the pipe doesnt rattle,and use high temp silicone on the o-rings where they slide into the cylinder.

reknelb:
Be sure it isnt something totally unrelated to the engine. I had some rattling and it was my clutch lever bouncing off my plastic hand gaurd. What kind of piston to cylinder clearence are you running?

hughes:
I do use high temp silcone but this crush washer is about 8 months old and I have had the pipe off 4-5 times. Piston to cylinder wall clearence is unknow. My cylinder looked good so I installed new top end. I know that is not the correct way. This rattle is only at idle. I am going to get some new copper pipe washers because mine is smashed and cracking. I have two tank of fuel ran through her now.

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