I have split the case, and removed the crankshaft and bearing seals. I want to replace the the crank Bearings. What is the best way to to get them out with out damaging the case? Also, when it is time to install the new crank do I need to use the Yamaha Installing pot tool? I can't find this tool anywhere.
I often end up submitting the same question on other sites
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Heat the case up and tap on old bearings. . A hotplate works but you'll probably be unpopular when the oil starts smoking in the kitchen. Its best tto use Yamaha tool to pull crank back into case. you may have to take it to dealer for this. ( case can get distorted or crank damaged if you hammer it in)
Yamaha Blaster Crankshaft
Well Yamaha Service Manager 1980-90 is correct in most of what he says but he left some stuff out, sounds like he still gets his check from the dealer. Split your cases, more than likely the crank will stay in one side or the other. If this is the case that makes removing the bearings easier as the one on the crank you should be able to get off without to much strain. As for the bearing in the case, he is correct, heat it up, I suggest I propane style torch using Map Gas (it gets hotter). You will want to take the case that has the bearing in it and freeze it over night, also put your new bearings in the freezer as well. After the case is frozen, remove it from the freezer and heat up the case around the bearing trying not to heat the bearing (aluminum warms faster then steel), once the case is good and warm then flip it over and with a punch and a gentle tap of a hammer on the inner race of the bearing it should just pop out after a few taps. Once you have the bearing out then you can remove the seal if you haven't already done so. Clean the surface that the bearing sits in very well, I suggest carb cleaner or something of the sort. After it is clean heat it back up, go grab your new bearings out of the freezer and drop them right in. As long as you have the case hot enough the bearings should push right in. Let cool to room temperature and then reassemble. Put the transmission back into the case, Yamabond the mateing surfaces of the cases and push them together. I have a piece of pipe that I have made to fit onto the case at the crank bearing, you can use something similer. Then press the cases together slowly making sure that the transmission is not binding with anything and the crank spins free. After they are together put your center case bolts and and finish assembly.
