any1 ever rebuilt your bottomend???

ive done it. you will need a press to pop out the crank. you can usualy get one side off by tapping, then press the crank out the other side with a arbour press. if the bearings are still in the cases instead of stuck to the crank, then you gota press them out too. only tool you would need is a crank puller/installer tool. i didnt use it, but ive got mad skillz :)
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no but seriously get the tool. that was such a pain in the ass to use that sh*t. what i did was like you see, some spreaders to sit on the edge then i used washers as spacers and i just tightened the bolt on the crank, loosened, more spacers, tightened and repeat. you gota be careful about clearences, like how far you pull the crank in, the gaps are small and precise.

other than the crank, its easy. just dont let your transmision fall out, leave it in 1 side of the case halfs or its a pain in the ass to get back in right. also, to keep the clutch from moving, jam a penny(or any soft metal thing)between the gear on the crank and the gear on the counter ballencer(like above the clutch behind it) that will hold for most gears and then to get the nut off the inner clutch part, put it in gear and put some vice grips on the sproket shaft and let it sit against the case or hold it.

if you have an impact gun, makes everything so much easier. a impact screwdriver is also your friend for alot of the case screws.
 
wow dat looks like maad hard work de way you did it i wudn even attempt it witout the tool dats way 2 complicated lol
so wit the tool wen i puttin it bak in do i jus pull it till it wont pull any more or is it persise distances or sumting???
 
i just pulled the crank in till it stopped.
he's right about the tranny too, that sh*t sucked to get back in there. had to sweat the drum in while trying to get all the other parts in correctly.
search on youtube, there's a series of 3 videos that goes through how to rebuild a bottom end of a 2 stroke.
i'd recommend getting the puller and the splitter. check sportingforless.com for the best price on the splitter.
the clutch/flywheel holder is a great tool too, but you can do w/o it using the washer method. the flywheel puller is a must though.