TRX250R.ORG
Workshop => Engine and Bottom End => Topic started by: sam mc 2000 on August 03, 2013, 06:16:48 PM
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Hi everyone. I want to start by saying nice forum. Here is my issue. I am not sure what is the best way to put my crank in the cases. I have got new crank bearings and crank. My father already put the one bearing on the splined side of the crank. So i have the other bearing to install yet before i can put the cases back together. I was wondering is it best to install the other bearing into the case then freez the crank and install case halfs. Or insatll the bearing on the crank like the otherside and the heat the cases and install the crank. I wanted to install both bearings in the case first but he put on the bearing when i was not there and i cant pull the bearing my puller broke so i just need help what is the best way for me to do this from this point. Thank you for any help on this
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Typically you'd wanna install bearings in cases first. Heat cases and freeze crank is what I've done in the past.
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I'm taking it you are using a hot rods crank? An OEM crank would be a slip fit on the clutch side. How did he put the bearing on the crank?
Your going to need a crank/crank tool to assemble it correctly. Tusk makes a nice one at a decent price.
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it is a new nos crank and new oem bearings do I need the tool
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What i do is get the bearings in both cases, freeze the crank, heat left case bearing first, bang the crank in with a rubber mallet(not too crazy!), assemble the tranny, get the gasket set, heat right case, slide it over, work it down with the rubber mallet easy, then use the bolts to get it all snug and tight. This is how ive done several bottom ends on 250r motors.
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Any members live close to Victork, if you do, go by sometime or another, talk to him & when he aint looking steal has rubber mallet. :sign0108: :sign0181: :hopelessness:
Really though, if an OEM Honda crank is being used, already in the left case half & everything lined up, you most of the time got to hold up on the left side case to keep it from slamming down on the right side.
Theres some you'll need to wiggle a bit like if the case is crooked just a tad going on, but normally they are free to slide in place.
Heres something some of you not going to like, but it is something we might need to do until somebody here starts producing them.
If a Hot Rods crank is being used in the build, most all of us know they are not a slip fit into the clutch side main bearing, so you got to open the bearing up or either dress the crank to make it a slip fit or use the tool to pull the cases together. The last one I dont intend to do, if its not free to slide right into place I'll fix it so it is.
Theres a main bearing, that has been machined on the inner race to allow the Hot Rods to slip fit, but guess who has those bearings, yep you guessed it Carlos, so that is why I'm saying until somebody here offers them.
Dont everybody jump on me & start beating all at once, one or two at a time please cause I'm old & wont take much to knock me out :victorious:
Neil
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Any members live close to Victork, if you do, go by sometime or another, talk to him & when he aint looking steal has rubber mallet.
Neil
That was funny :applause:
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Look on Rocky Mountain for the Tusk crank installer/puller. Extremely handy tool, you will be very glad that you invested in it. Can be used for multiple engines, either 2 or 4 stroke
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I understand you're in a bit of a bind with installing your crank bfw bearings (https://www.bearingforworld.com/). Since your father has already installed one bearing on the splined side, your options are limited