Maintenance & Technical > KX500 Original
I'm not a softy ... :-)
JanBros:
I changed the title see second page :wink:
... or is there somthing wrong ?
Seems I can't get my 500 engine kicked over :-(
Already installed a decompression valve : drilled a hole off 2.5mm from the head to a stud. If I kick it like this without the nut and valve on top, I manage to have it turned over - just- but in no way it's as easy as can be seen on some video's where the guy just sits on the saddle while kicking it :? . The nut I made ( I have a lath and a mill) also has a 2.5mm hole, and with the nut installed it's the same.
Then when I put on the decompression valve (comes from a Still chainsaw) it's again like kicking a wall ... Is the opening in the valve too small ? I already drilled the outgoing hole also to 2.5mm, but don't know what's inside. Head looks completly syandard wihtout any other work done to it.
I measured the combustion chamber volume, and it's about 32.7ml or ccm . Is this normal, or is this very little ? only thing I did on to the head was take a bit off to get to a squish off 1.5mm (which is still ver safe I thinck ?). squish was over 2mm, I couldn't measure it with tin solder.
without the head on the cylinder, the top off the piston is even with the cylinder. is this normal, or has the cylinder been shortened ? it has a steel liner, so might be possible they skimmed it to get it even.
since my engine came out off a KX250 frame, I wondered if I have the right Kick ? so I measured it : from the bolt that holds the bearring-ball to keep the kick in place to the top is 18cm. is this correct, or does a 500 should have a longer one (which would make it easier) ?
cranck ran free when I putted it back in (with new seals and bearrings), without sparkplug no real resistance ...
At the moment I'm running out off ideas, other than I'm too soft for this engine :-D
Or do I just need a different decomp valve that lets escape more ?
What's the biggest hole you can drill through the combustion chamber without having problems ? I read on here most off you only drill a 2mm hole.
Chod:
39.95 Jfab head ache gone.
JanBros:
--- Quote from: Chod on April 19, 2010, 05:54:54 PM ---39.95 Jfab head ache gone.
--- End quote ---
:? in English ? :-D
forgot to mention : 32.7 is including the complete spark plug hole.
Friar-Tuck:
The Engine Builder/Machinist/ Fabricators have been very open with their work.
Hopefully some of them will read this and post.
Everyone I have read who has the DeComp valve likes it as it is a marked improvement. Something doesn't sound right.
Please stand by...
Tuck\o/
Friar-Tuck:
He's referring to buying a kit supplied by one of the Fabricators on the site. He will send you a kit For about $40.00 US.
I'm sure that does not include shipping Overseas to UK. I will look for the post.
Here http://www.kxriders.com/forums/index.php/topic,6545.0.html
And Chainsaw DeComp
Here: http://www.kxriders.com/forums/index.php/topic,6998.0.html
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