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762
Joined
2/21/2009
Location
Fort Dodge, IA
US
Truckdriver
3/13/2018 4:21pm
3/13/2018 4:21pm
I pulled apart a 2016 KTM 250SX-F with 73.1 hours. Replaced piston and cam chain.
Tensioner does not seem to hold chain tight enough to keep it from jumping on the intake cam gear when I test spin the motor. Could the tensioner just be wore out and will not work upon re assembly? Did I fail to set something right? Should we look at an aftermarket manual tensioner?
Tensioner does not seem to hold chain tight enough to keep it from jumping on the intake cam gear when I test spin the motor. Could the tensioner just be wore out and will not work upon re assembly? Did I fail to set something right? Should we look at an aftermarket manual tensioner?
I would stay away from the manual tensioner.
Paw Paw
The Shop
Paw Paw
Speaking about setting the tensioner, service manual says, This function is necessary to ensure sufficient timing chain tension even at low oil pressures. So if not set properly it sounds like it could jump.
Tensioners have been known to go bad, but it was much more prevalent on earlier generations. You hardly ever hear about it now on sites like KTM Talk where it used to come up from time to time previously. Especially considering how many more KTM/Husky 250/350s are out there now.
Setting the adjuster is a pain.
You must use something to just catch the small lip while you push down, it should click all the way closed.
Now the hard part. I figured out how to make the tool to release the adjuster while it's inside the cylinder.
Both the outside and inside need to be pushed at the same time to release the stupid thing.
I can post a picture of the tool tomorrow.
Basically the tool is just two push pins, but the inside pin sticks out about 2mm.
Imagine you pushed a Popsicle out about 2mm, make a small tool that fits in the hole, with a inner pin and give it a quick hard push. I hated learning about how that thing worked.
below video shows how to set it correctly, I used a washer that barley fit, just touching the small chrome lip while pushing down.
https://www.youtube.com/watch?v=ZwiJkRJTz-Y
Good luck to you, but I am done with you after telling me to "read your post".
Paw Paw
Pit Row
You can take allen plug out, use oil squiter can on check valve to pressurize
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