Maintenance & Technical > KX500 Original
mill head or not??/
NZ500:
Thanks for info on head mods Motorrad. How wide are your 4 degree sections? The left looks about 25% of the original 15 degree and the right about 60%? I have an AC/DC TIG at home and lathe so can do the more aggressive one (presuming my head would have been messed with before). Much success holding it with a 4 jaw chuck or is a fixture with expanding collets for head holes the only way?
I normally run avgas (105 leaded) or 98 pump. Have new rings and bottom end. Stock port timing and no piston window. I didn't do a compression test before I pulled it apart for comparison. Where should I be aiming for? 160-170psi? Would be good to measure the chamber volume before and after but if it's been done a lot and results are known maybe I don't need to get to worried? Thanks for the help.
Larry Wiechman:
--- Quote from: NZ500 on June 09, 2012, 10:56:52 AM ---Much success holding it with a 4 jaw chuck or is a fixture with expanding collets for head holes the only way?
--- End quote ---
Motorrad posted a photo of a simple head fixture in some other thread. If you say "please" I'll bet he will stick a copy here for you. Proper tooling makes it easy to do quality, repeatable work.
Larry
NZ500:
Thanks Larry. I remember seeing the photo of that. It looked like a nice set up, I bet it saves a lot of time. But I only want to do this head for now (moving to Australia in September) so I'll have a go at getting it in the right spot using a four jaw first. They're quite an awkward shape is all so might be a fiddle.
Brute:
Austrailia!?!?!? Where seven out of the ten deadliest critters live? Not to mention all the crazy riders. Here is a vid of 2011 KX450F vs. 2000 KX500 over there with Peter Melton, fast rider for sure! Certain it has probably been mentioned here before.
http://www.youtube.com/watch?v=vau3sOsVxz4
kelcrist:
so heres an update to my current setup. i did not mill my head. i did install the thin optional kawasaki thin head gasket. i timed the powervalve with a bearing and shim setup. i was also browsing around through the thread of the head mods and i saw the porting of a cylinder and i decided to duplicate that. it was much easier than i expected. im sure the cylinder in the photos is a big bore but it all worked out. the engine is kind of a monster now..........revs like crazy. i also replaced a couple of worn items when i had cylinder off, the wrist pin was wearing a groove in it and of course i put in new rings. all OEM parts since my piston is a stock kawasaki item. prior to this the engine was kind of lazy and didnt really pull all the way through the rpms. now it does it much quicker. i had to jet from a 158 to 170 and the pilot from 50 to 58. so all in all its worked out well.
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