bottom end crank replacement

[riderssb250x]

im rebuildeing my bottom end on my 86 r puting a new crank in trying it for the first time and im up to the flywhel I bought a flywheel holder in gonna have alota of questions please help!

is the bolt to romove the flywheel a reverse thread! I can't seem to get it off ahh! helphelpehelp

[trx250rider]

are you trying this for the first time without a manuel

[riderssb250x]

im buyin g a manual soon, I've ppulled motors apart before just never the flywhel can anyona answer this are the flywheel threads left hand?

[Honda 250r 001]

no it is not. its right handed threads and most of the time requires a flywheel puller and a impact wrench to get it off.

[riderssb250x]

I bought the motionpro clutch/flywheel holder im gonna try that and an impact gun to get the bolt off amd the im going to my local shop to buy the puller and service manual any tricks to getin the bolt off?

[05LSR250R]

The manual says to put the bike in 5th gear. Have someone apply rear brake. Loosen the nut. The motion pro puller works like a charm, thats what I use. Do not use a jaw type puller!! Be careful not to lose the woodruff key!

[riderssb250x]

thats probably a good idea but my engines out of the bikee..

[Honda 250r 001]

IMPACT WRENCH! thats how you get the nut off. and a air hammer helps ya get the flywheel off the crank. if you already took the top end off. put it back on without gaskets but with the piston and rings.

[05LSR250R]

Yeah, if its not in the chassis you'll have to use the impact wrench! I wouldnt use any type of "hammer" on the flywheel!! Get the motion pro puller.

[riderssb250x]

everyones telling me to get the motion pro opuller! thats to take the flywghell out right?

im still trying to get the nut off i bought the motion pro clutch hub and flywheelholder what ill try is use the holder and try to use an impact gun on the compressor then im buying a flywheel puller either the motion pro or something else thaeres a few on rebay

[riderssb250x]

why should i put the topend back on thats moving backwards im dissasmebling the engine..?

[05LSR250R]

Yes . The Motion Pro puller is for the flywheel. I t threads in where the nut is after you get the nut off. I dont know about the "install cylinder" thingy that was said.

[riderssb250x]

alright thanks,
so if i use the holder and an impact it hould come off farily easy?
also is there anything i should watch out for that will break down ther haha?

one more question removing the harmonic balaancer>? im geting a service manual soon ui just wana try and get some of this dopne in the process and get it going thanls lsr245 you always seem to be a big help in my threads ur not a hacker haha

[05LSR250R]

No way man. No hacker here. Put the gear box in gear and use the impact. Pull the trigger fast with a full head of air behind it. Should remove the nut for ya'. Definitely get that manual asap!

[C-LEIGH RACING]

Once you get the flywheel nut off, theres a small flat washer up in there as well. Pull that out with a small magnet.
The flywheel puller, those big threads in the flywheel are backwards rotation where the puller screws into & make sure you have it screwed in completely. May need to clean those threads up if they are rusty any at all with a small wire brush.

Do yourself a favior if you have an air compressor, buy a cheap 3/8s butterfly impact wrench. Most cheap ones sell around 30 to 40 dollars, but boy are they usefull when you have one. Most used tool in my shop is the butterfly.

DO NOT, DO NOT, use a jaw puller to pull that flywheel off, cause if you do, you can throw it in the trash afterwards because it will bend it out of shape.

Next, dont got any farther untill you have that manual in your hands & reading.
Neil

[riderssb250x]

will do thanks guys ill kepp you posted im gonna try this tonight after work

[Honda 250r 001]

Originally posted by riderssb250x
why should i put the topend back on thats moving backwards im dissasmebling the engine..? that will hold the crank if your going to get it if by hand.

[Honda 250r 001]

Originally posted by C-LEIGH RACING

DO NOT, DO NOT, use a jaw puller to pull that flywheel off, cause if you do, you can throw it in the trash afterwards because it will bend it out of shape.



dont be so sure. i have done it for years. if you are careful. what i do is put never seize on the crank before i put the flywheel on. Then i put pressure on the flywheel with the puller and i tap on the bolt on the crank with a hammer and it usually just pops off easily.

[riderssb250x]

well i just got the nut loosened using ur guys help noww i gota order that flywheel puller im deoing that right now and ill puill the flywhhel off

[riderssb250x]

GREATTTT i was chacking out i beleive its the transmission bearing on the clutch side and i beleive it spun it move in and out a bit and it also moves sround if you move it what do i sdo !!!

judt replace it or what? helphelphelp

[All250R]

Originally posted by Honda 250r 001
dont be so sure. i have done it for years. if you are careful. what i do is put never seize on the crank before i put the flywheel on. Then i put pressure on the flywheel with the puller and i tap on the bolt on the crank with a hammer and it usually just pops off easily.
Applying a lubricant is probably not what most people do. The proper tool works whether anti-seize has been applied or not.

[All250R]

Originally posted by riderssb250x
GREATTTT i was chacking out i beleive its the transmission bearing on the clutch side and i beleive it spun it move in and out a bit and it also moves sround if you move it what do i sdo !!!

judt replace it or what? helphelphelp
For my money, I replace the case half. Otherwise there are certain types of anti-seize that can be used for bearings and have a tolerance rating associated. Some precision measuring tools would be helpful. I don't like assembling engines wondering how long the workaround will last though. I stay away from ebay cases for fear of inheriting that problem. New case halves are expensive so that is just me!

[riderssb250x]

would it make a difference if i just got a new bearing? or would it still spin? what do i use your saying antiseeze to hold it in what?

[riderssb250x]

bump for a good cvause....

[86 Quad R]

Originally posted by riderssb250x
would it make a difference if i just got a new bearing? or would it still spin? what do i use your saying antiseeze to hold it in what?

its not antiseeze that you'd need to use. its a loc-tite specifically for taking up loose tolerances in bearings ect ect.

[riderssb250x]

well where can I get this bearing locktite?

also is this gonna cause bad problems in the future should I put a new bearing in or will that not even make a difference? I don't wana replace the case half that's alota money

someones had to have had this problem!! help

[86 Quad R]

are you absolutly certain that the bearing is slack in the case? it's also normal for the trans shafts to have a bit of end play but shouldnt be excessive tho. make doubly sure that the up and down slack that your experiencing is simply in that particular bearing and not between the bearing and case.

[riderssb250x]

the bearing doesnot move up and down it just moves in and out if I pull on the transmission shaft and iff I try to move the bering in a circle with my fingers I can its a bit hard to but I can so idk if this will be normal and help in when everythogs reassambled?

I don't think replacing the bearingg will do much ill have a closer look at it once I split the case

[All250R]

Originally posted by 86 Quad R
its not antiseeze that you'd need to use. its a loc-tite specifically for taking up loose tolerances in bearings ect ect.
YES, this is what I meant. Sorry for the confusion. Loctite. You can google for the different flavors and pick a product you think will fill the gap the way you want... I don't recommend this though as the "right" way to do it. 2c.

[86 Quad R]

agree'd !! if it were the crank bearing i'd not do it. :eek:

[All250R]

Originally posted by 86 Quad R
are you absolutly certain that the bearing is slack in the case? it's also normal for the trans shafts to have a bit of end play but shouldnt be excessive tho. make doubly sure that the up and down slack that your experiencing is simply in that particular bearing and not between the bearing and case.
True. If you say the bearing "spun" or "moves around" it sounds like something is wrong. Either way you need to split the cases and find out what's worn. Otherwise we're all just speculating along with you. however, the bearing should rotate, smoothly, quietly and there should be no noticeable slack in any direction. The bearing should also be tight inside the aluminum. If the aluminum has been "spun" against, the case half is compromised to some or large degree.

[riderssb250x]

the bearing does not move up and down it nmoves in and out a lil bit and it could be cause the plate thats holds the bearing is removed right now?

[trx250rider]

just to let you know if you want to buy a new oem short rod crank, service honda has them for 171$

[86 Quad R]

they are discontinued. :(

[riderssb250x]

there discontinued for sure? there's no where to get one at all ?=/

[86 Quad R]

i'm very sure. sux!!!

[riderssb250x]

illl probably go with the 87 and get a spacxer... what size does the spacer need to be 4.5 mm right?

[trx250rider]

service honda is showing them in stock.maybe you should try calling them.