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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Thought I Was On The Home Stretch?
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[QUOTE="Ol'89r, post: 1226196, member: 17212"] Bernie. Did you use heat on the cases? If not, the bearings will not seat all of the way down in the case. They will bind in the bearing boss and cause the crank to bind. You may want to try to install the main bearings on the crank. Drive them all of the way down on the shaft with a deep socket that fits the inner race. Don't drive on the outer race. Then place the crank in a sealable plastic bag and put it in your freezer for a couple of hours. Lay the case on it's side and heat the case evenly until you can sizzle a drop of water on the case. Then, take the crank and drop it in the case. If done right, the crank will drop all the way into the case. Then heat the other case and drop it over the crank. It should seat all of the way down. If you do it without heat, the bearings will bind part way down the bearing boss and will remove a small amount of material from the bearing boss. If the bearings are removed and replaced a few times without using heat, it will wear the bearing bosses and the cases will be junk. Having the C/S o-ring in the wrong place will bind the gearbox but it should not bind the crank if the cases are bolted tightly together. It is usually an improperly seated bearing that causes that. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Thought I Was On The Home Stretch?
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