Question about Yamaha YZ 450 F Motorcycles

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I have a 2001 banshee. took my cylinders to yamaha and there bored them out and did the rings i installed everything. has compression spark n air. fuels getting to the carbs but it still wont start. called yamaha and asked if it needed to be jetted and they said no. any ideas?

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Is the timing set properly? you might have an issue unrelated to the cylinder work....can you give me more information....what have you checked, and the exact symptoms....when you took the carb off, did you mess with the TPS ?

Posted on Apr 11, 2011

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1992 banshee starts up and dies and low compression how to tell if rings are bad


Pull the plugs and run a compression test . record readings . now squirt some oil into the spark plug holes and redo the compression test . record readings . if the compression was higer on the second test , the rings are bad , if not the valves are bad

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Many piston compression (rather than oil) rings are uni-directional, and need to be installed with the proper side upward. The rings will have a "T" or "TOP" etched on the surface that needs to face upwards.
So my first question is, did you install the rings upside down?

Second, why did you replace the rings?
Did you measure the cylinder bore? Was it oversized, or out of round?
Is the bore worn enough that the piston is now too loose a fit?
Did you get the correct size rings? If you bored the cylinder, did you get the proper oversize rings?

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It looks like your compression is too low (worn rings from dusted motor) Push starting spins the motor faster than kick starting and when hot the rings expand just enough to seal off. Before kicking a cold motor try putting in a squirt or two of engine oil in the plug hole to see if there is a difference.

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Did you accidentally cross the spark plug wires?
Other wise its going to be hard to diagnose,
Do you have plenty of compression,
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You will need a factory service manual to diagnose further if all the above is ok

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