Maintenance & Technical > KX500 Original
What should the motor sound like?
oic0:
--- Quote from: KX500freak on May 11, 2009, 05:20:42 AM ---crank tight,you mean bigend noise or how the crank fits in the cases ?
--- End quote ---
No play in the big end. I usually wiggle and tug on the rod (boy that sounds wrong) whenever I replace a piston to make sure it has no play. I asked the seller about that but he had no clue since he didn't do the rebuild. He also didn't know what size over it was they had to use, only that it was bigger than stock.
P.S. Which member filmed himself in his pajamas lol?
KX500freak:
--- Quote from: oic0 on May 11, 2009, 09:44:38 AM ---
--- Quote from: KX500freak on May 11, 2009, 05:20:42 AM ---crank tight,you mean bigend noise or how the crank fits in the cases ?
--- End quote ---
No play in the big end. I usually wiggle and tug on the rod (boy that sounds wrong) whenever I replace a piston to make sure it has no play. I asked the seller about that but he had no clue since he didn't do the rebuild. He also didn't know what size over it was they had to use, only that it was bigger than stock.
P.S. Which member filmed himself in his pajamas lol?
--- End quote ---
that is blown8950 :-D http://www.kxriders.com/forums/index.php/topic,5512.0.html
oic0:
I still can't decide if I have piston slap or not. Through the exhaust, the bore and piston look good but I can hear the piston moving pretty loudly. I get all worked up and want to rebuild it (then think of the 200-400 dollar cost, arg!). I watch some videos on youtube and most of the motors in those videos have the same sound. Then I think "I will just pop the top and measure", but that costs about 40 dollars in gaskets + god knows how much in tools. That makes me start wondering if I should go ahead and put a piston in if I am going through that trouble. Round and round in circles I go wondering if my piston is going to shatter or if this is the normal sound.
I sort of miss the sleeved RD engines with their cheap + reusable head gaskets and cheap pistons :(
tharden:
The kx500 cylinder if not modified can not be bored over as they are plated. I have the same plans for my engine. I do not have any noise and it is fairly powerful, but in about three months I am going to completly overhaul it. I plan on doing the following. New piston, shaved head, new main bearings and seals, v-force reeds and block, new clutch, and check crank clock. The cost is not bad as my motor is stock and 8 years old. It still produces 162psi compression, and I have not really ran it since fixing alot of neglected problems that it had. My advice, if you are going to take the time to take the motor down do it right and the motor will do you right.
Johnniespeed:
Guys
It just isnt that big of a job to remove the piston and have a look. It takes more time to wash my truck than remove the piston from my KX500.
If you have an oversize piston, that is a major red flag and my concern is WHO replated the cylinder ?
The steering head shake will be eliminated by a steering damper, I happen to use GPR but there are also Scotts and WER brand available.
When I hear engine noises, that means my pipe mount is broken again. After a new mount my engine sounds great.
Take a look at your piston and throw that dented pipe away. ( unless you have a friend who repairs pipes )
Just my thoughts anyway.
John
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