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  #1  
Old 01-22-2008, 02:13 PM
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Default New crankshaft for RM125 1997?

     

I blew the lower connecting rod bearing on my 1997 RM125, so I am looking to replace the whole crankshaft. It did some damage to the crank itself when it broke, which is why I need a new one.

Is there any place for me to get a new crankshaft assembly for cheaper than OEM? I have checked various 3rd party companies (hot rod, wiseco, a few others) and I cant find ANY crankshaft assy's for a 97 rm125.

Also, if I can only go with OEM, would it be better for me just to get a new lower connecting rod bearing and have a machine shop press/rebalance the crank? The damage on it isnt severe, it just has a couple minor chips around the edge.
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Old 01-22-2008, 03:45 PM
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Default Re: New crankshaft for RM125 1997?

unless the wheels themselves are tweaked and the ends cannot be aligned you will be able to put a new rod and bearing in it. fyi what most people call "balancing' is simply aligning the crank halves again. two different procedures. few of us have ridden a bike with a crankshaft that has actually been "balanced" beyond what the factory sends.
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Old 01-22-2008, 03:56 PM
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Default Re: New crankshaft for RM125 1997?

Alright sweet, i'll look more into just replacing the bearing then..AFAIK, the rod itself is still in good condition, the bearing just locked up and broke so the rod has about a half inch of slack on it.

Any idea how much it would cost to have a machine shop press and align the crank again?

The crank itself is still together and in pretty good shape (Like I said, just a couple dings in the rim of it) but not bad at all. The reason I was going to get a whole new crankshaft is because of the slack from the broken bearing.
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Old 01-22-2008, 04:09 PM
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Default Re: New crankshaft for RM125 1997?

Rocky Mountain ATV/MC <--parts

LukesRacing.com <--parts

FastForwardRacing <--labor

i think Tryce charges 35$ labor for a crank rebuild, that is you sending the crank and him replacing the rod and bearing, and truing the crank to .002" Highly recommend this, because a rod kit runs about 77$ from Lukes (at least for my 03) and with 35$ labor, you are spending about half of what a new aftermarket crank would be.

Rob
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Old 01-22-2008, 04:12 PM
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Default Re: New crankshaft for RM125 1997?

correction, $50 on labor.
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Old 01-22-2008, 04:23 PM
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Default Re: New crankshaft for RM125 1997?

DON'T even think about using the original rod.
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Old 01-22-2008, 04:40 PM
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Default Re: New crankshaft for RM125 1997?

Looks like I'll probably be going with him then.

Ok, so what all do I need then to get this thing fixed? I obviously need a rod kit (Thinking about going hot rods, thats what my current rod is). Would I send him just the rod kit and the crankshaft then?

And once I get the crankshaft back, do I just need new clips and a complete gasket kit right?

So..$100 for the rod, $50 for labor, and about $70 for a complete gasket kit from Rocky Mountain..That puts me at $220. Is that all I need?

That is amazing! I was looking at replacing the whole crank, OEM, which in itself was $550. Sadly there are no aftermarket cranks for a 97 rm125 =(
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Old 01-22-2008, 05:00 PM
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Default Re: New crankshaft for RM125 1997?

i'm sure there is, but you just have to know where to look.

make sure you get a gasket kit that comes with OIL SEALS. the cometic brand "complete gasket set" is NOT 'complete'. i found this out the hard way... yes, it comes with all the necessary paper gaskets and o-rings, but none of the shaped oil seals. Moose sells a kit, available at rocky mountain, for (i believe) 80 bucks. it is a "complete kit with oil seals" and it's the one you want.

a list of parts to send to FFRacing (after calling/emailing/PMing him to let him know it's coming... )

-your old crank
-your new Hot Rods Rod kit. it should contain a Rod, Bearing, and Thrust washers. some kits come with a Wristpin bearing as well.

he will rebuild your crank, true it, and send it back. after that, you need

-newly refurbished crank.
-Crank Bearings
-Gasket set,
-all new oil seals. the original ones might be in good shape, but for $22 it's cheap insurance to replace them while you have the entire engine apart.
-piston kit
-top-end bearing (aka Wristpin Bearing)
-your bike, a manual, tools, a press, and some elbow grease.

do a search for crank installation, it wasn't long ago (few days) someone was on ATM asking about how to rebuild the bottom end. that way you dont' have to start a new thread about it... the information here and your manual should be more than enough to get you in the right direction. just take your time and don't force anything. read ahead in the manual, and don't take shortcuts. and, good luck

Rob
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Old 01-22-2008, 05:07 PM
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Default Re: New crankshaft for RM125 1997?

Should I replace the piston as well? The piston and rings are both brand new (Maybe 2-3 hours of riding time.)

Also, for the crank bearings, do I have to buy new ones of those if my current ones are still good? Only the lower rod bearing broke.

And as you mentioned, I might as well go with the complete kit with the oil seals.


I have a mechanic right now that is a family friend with the press and tools needed to rebuild it, so basically I just need to know what to give him after the crank is rebuilt, which you pretty much covered.
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Old 01-22-2008, 05:29 PM
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Default Re: New crankshaft for RM125 1997?

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Originally Posted by D3luxe View Post
Should I replace the piston as well? The piston and rings are both brand new (Maybe 2-3 hours of riding time.)

Also, for the crank bearings, do I have to buy new ones of those if my current ones are still good? Only the lower rod bearing broke.

And as you mentioned, I might as well go with the complete kit with the oil seals.


I have a mechanic right now that is a family friend with the press and tools needed to rebuild it, so basically I just need to know what to give him after the crank is rebuilt, which you pretty much covered.
at least get a new ring. that's all up to you though. i would definitely suggest new crank bearings, they are cheap (40$) and to replace them you would have to split cases (again) and go through another set of gaskets, etc. they also freshen up the motor in a way you won't appreciate until you replace them. you don't notice until you have a new bottom-end how much of a difference it makes having fresh bearings. even if it means you have to wait an extra week or so to pay for the parts... that's what i'm going through right now with my 125. instead of rushing and having a half-*** bike, take the time required to get the necessary parts and do it right the first time.

plus when you sell or trade it for a new 450 like i'm doing( ) it helps to be able to provide receipts of every major engine part on the bike to a potential buyer.

Rob
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Old 01-22-2008, 05:38 PM
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Default Re: New crankshaft for RM125 1997?

Well, with a new piston and ring, as well as new bearings, that puts me up around $325 (If I counted right ) which is DEFINITELY doable. Wayyyy better than $550 for just the crank assy alone OEM.

I almost have the money already, plus my birthday is in only 14 days (Turning 17 ) which means I can get some more money for that, and I'll have another paycheck by then.

Sweet, this things starting to come together so i can get riding again..Its been killing me!

Thanks so much for your help..Its nice to finally get straight answers! This thing blew up in the end of August and I havn't been able to get straight answers on it till now..ATM is my new home, lol.
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Old 01-22-2008, 05:52 PM
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Default Re: New crankshaft for RM125 1997?

Quote:
Originally Posted by D3luxe View Post
Well, with a new piston and ring, as well as new bearings, that puts me up around $325 (If I counted right ) which is DEFINITELY doable. Wayyyy better than $550 for just the crank assy alone OEM.

I almost have the money already, plus my birthday is in only 14 days (Turning 17 ) which means I can get some more money for that, and I'll have another paycheck by then.

Sweet, this things starting to come together so i can get riding again..Its been killing me!

Thanks so much for your help..Its nice to finally get straight answers! This thing blew up in the end of August and I havn't been able to get straight answers on it till now..ATM is my new home, lol.
welcome to the site bro, glad we can help. Straight Answers is what brought me here wayy back when i was 15 and rebuilding a YZ... lol
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Old 01-22-2008, 06:08 PM
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Default Re: New crankshaft for RM125 1997?

Yeah, thanks =)

I'll keep everyone updated as to how it goes too..Hopefully have the parts ordered early feb, get this thing back up and running.
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Old 01-22-2008, 08:53 PM
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Default Re: New crankshaft for RM125 1997?

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Originally Posted by D3luxe View Post
Yeah, thanks =)

I'll keep everyone updated as to how it goes too..Hopefully have the parts ordered early feb, get this thing back up and running.
What $550 for a crank! Go to this guy half the price for a crank, rod, bearings and top end kit!

Email him and he should be able to get 97 stuff: eBay Motors: SUZUKI RM125 RM 125 WISECO CRANK PISTON BEARINGS NEW (item 260204913799 end time Jan-28-08 19:45:00 PST)
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Old 01-22-2008, 09:07 PM
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Default Re: New crankshaft for RM125 1997?

Quote:
Originally Posted by Rocky_mx View Post
What $550 for a crank! Go to this guy half the price for a crank, rod, bearings and top end kit!

Email him and he should be able to get 97 stuff: eBay Motors: SUZUKI RM125 RM 125 WISECO CRANK PISTON BEARINGS NEW (item 260204913799 end time Jan-28-08 19:45:00 PST)
GAAAAH

i just spent 245 on a Crank, Bearings, Complete gasket set and Complete seal kit.

actually, i think i got the better deal. i can get a Wiseco for $60, and the gasket/seals run about $75-80. good find though, i need to learn to use Ebay...
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Old 01-22-2008, 09:08 PM
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Default Re: New crankshaft for RM125 1997?

Quote:
Originally Posted by Rocky_mx View Post
What $550 for a crank! Go to this guy half the price for a crank, rod, bearings and top end kit!

Email him and he should be able to get 97 stuff: eBay Motors: SUZUKI RM125 RM 125 WISECO CRANK PISTON BEARINGS NEW (item 260204913799 end time Jan-28-08 19:45:00 PST)
Yeah Oem is expensive Thanks for the link, I'll check it out when I get a chance
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Old 01-24-2008, 06:26 AM
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Default Re: New crankshaft for RM125 1997?

Talked with Tdub from Fast Forward Racing about getting the crankshaft rebuilt. He said I am 2 days shipping time from him, and just to send him the crank, a rod kit, and a check for $60 ($50 labor and $10 for shipping back.) As soon as he gets it he is going to press and align it and send it back same-day.

So, I got the rod kit ordered from Hot Rods yesterday, should be here by the beginning of next week. Whoo!

Time to start ordering the rest of the stuff.


EDIT: Hey, can anyone find the full gasket kit with the oil seals on rocky mountain? The only one I can find on rocky mountain that is a full gasket kit doesnt have the seals (the cometic kit), the moose kit isn't on there..I found another place I can get them from (dont have the link right now), but i'd rather just bulk order from rocky mountain.

Last edited by D3luxe; 01-24-2008 at 06:54 AM.
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Old 01-24-2008, 09:11 AM
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Default Re: New crankshaft for RM125 1997?

Quote:
Originally Posted by D3luxe View Post
Talked with Tdub from Fast Forward Racing about getting the crankshaft rebuilt. He said I am 2 days shipping time from him, and just to send him the crank, a rod kit, and a check for $60 ($50 labor and $10 for shipping back.) As soon as he gets it he is going to press and align it and send it back same-day.

So, I got the rod kit ordered from Hot Rods yesterday, should be here by the beginning of next week. Whoo!

Time to start ordering the rest of the stuff.


EDIT: Hey, can anyone find the full gasket kit with the oil seals on rocky mountain? The only one I can find on rocky mountain that is a full gasket kit doesnt have the seals (the cometic kit), the moose kit isn't on there..I found another place I can get them from (dont have the link right now), but i'd rather just bulk order from rocky mountain.
Try ebay...
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Old 01-24-2008, 01:41 PM
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Default Re: New crankshaft for RM125 1997?

I thought about that, but found this site with them.

https://www.upunder.com/webstore/sto...dCategory=2738

Anyone order from them before?
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Old 01-26-2008, 08:17 PM
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Default Re: New crankshaft for RM125 1997?

Has anyone ordered from them before?

I plan on ordering the rest of the parts within a week or two, so just wondering if I should get the gasket/seal kit from them, or find the kit on ebay or something.
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