Inspired by a facebook group discussion that will disappear like all the rest…
Please add your insights and experiences below…
If you have an engine mount that refuses to stay put, or a chain that keeps falling slack here are some items to check.
Ensure the mount and it’s clamps match the spacing and size of your chassis.
Remember many karts are comprised of different rail sizes from side to side or front to rear, so it’s important to check you have the correct size. The CRG family has a slightly different center-to-center spacing on the motor mount to others, that’s a common one that catches people out.
Here’s a great video from @Norcal_Karters that shows you how to accurately measure the frame size and spacing:
Inspect the area where the mount meets the frame rails
Are the rails clean where the mount contacts them? Dirty rails, no good!
Pay close attention to where the mount might also catch on a weld for a sidepod or seat bracket mount.
Flattening of the frame rails is another thing to inspect for.
Clamp Bolts and thread condition.
Clamp bolts and threads should be clean and generally in good shape. However they should NOT be lubricated. Inspect for any thread damage or warping, replace if unsure. Replacing these is good preventative maintenance.
Often the threads in the mounts are aluminum which is not always ideal. Some racers have drilled these out just deep enough to put a nut in place to use those threads instead.
Use a motor stop bolt behind the motor.
Essentially essential. You want to have a motor stop bolt wherever possible. It’ll make you and your chain happy.
Clamps should be free from dirt and not curved/bowed from overclamping.