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Steps
- 1Warm up the engine.
2
- Switch off the engine.
- 3Remove the engine cover that the generator/alternator sits behind.
- 4Grab hold of the generator/alternator and very firmly try and move it up and down and front to back.
- 5Feel for any slight movement or clicking in the generator.
- 6If you feel any then the crank needs a re-build since the generator is bolted to the end of the crank
Tips
- Get someone to hold the bike while you are trying to move the geanerator.
- Using a dial indicator and comparing reading changes with manual specified end float and radial movement tolerances will give a more accurate idea of the significance of any play found.
- You Must use a dial indicator, if you have reached the point where you can easly feel the radial movement by hand, the crank and/or the main bearings are stuffed and the enging would be running very rough and hard to start. As a general rule only, if the movement is greater than .004" to .006" the seal wont be flexable enough and will start leaking and allow either air or transmission oil to be sucked in, and your mates will easly follow you with the smoke trail.
- To perform the test correctly you need to remove the alternator/flywheel and use the dial indicator direct onto the shaft, and on the other end the primary chain or gear must be disconnected from the clutch or removed.
Warnings
- If there is no movement it doesn't mean the crank is healthy,just that it's not really worn.
- This is more a test to see if the crank is bad rather than a test to see if it's good.
Article provided by wikiHow, a wiki how-to manual. Please edit this article and find author credits at the original wikiHow article on How to Check for Play in a 2 Stroke Crank Without Dismantling the Engine All content on wikiHow can be shared under a Creative Commons license.
