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  #1  
Old 11-12-2008, 09:06 PM
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Moto 01 CR125 top end rebuild ?

If I were looking to replace the head, sleeve, piston and ring....on my 2001 cr125....What parts would you guys get? Wiseco ,Athena, ect?
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Old 11-12-2008, 10:31 PM
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Stock oem stuff for me. The only aftermarket stuff is the piston which is Pro-X

-Kevin-
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  #3  
Old 11-13-2008, 01:13 PM
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Quote:
Originally Posted by KKXR400R View Post
Stock oem stuff for me. The only aftermarket stuff is the piston which is Pro-X

-Kevin-
Did you do it all yourself or pay a shop to do it? What kinda of pointers could you give someone if they are doing it there selves?
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Old 11-13-2008, 01:57 PM
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go with the stock stuff and do it yourself. im as mechanically challenged as can be and ive done my own. there are some informative vids on youtube, put out by Rocky mountain. check em out
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Old 11-13-2008, 04:21 PM
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I was very fortunate to have a good friend teach me throughout the last couple of years. Heres some tiips that are just off the top of my head in no particular order.

Grab your manual and read through it a few times before you start ripping apart the bike. If you don't have one ....stop reading, get one on order and come back to continue......

Make sure you have everything you need BEFORE you start the rebuild. It sucks when you have to stop for a few days and try to remember what you were doing.

A good clean workspace and BIKE helps. Get some plastic parts bins and label them for those loose parts. If you have any plastic milk jugs, clean them out real good, they work great for draining fluids.

One of the things I picked up this last year; after removing plastics, radiators, brake calipers etc etc, thread the bolts back in so your not mixing them together in the bins. Always use a torque wrench and use it diligently. Have a good supply of rags and cleaners. I like scrubbing bubbles....works good on plastics.

Last thing....take your time. Rushing will only set you back. Watch this video, pretty informative.

Good luck with the rebuild!

-Kevin-

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  #6  
Old 11-15-2008, 07:43 AM
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If the sleeve is worn out, do you guys recomend a re-sleeve or have it re-plated?
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Old 11-15-2008, 09:08 AM
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Quote:
Originally Posted by OrangeF150 View Post
If the sleeve is worn out, do you guys recomend a re-sleeve or have it re-plated?
Re-plate.

-Kevin-
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Old 11-15-2008, 10:30 AM
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Who does that and how much?
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Old 11-15-2008, 10:38 AM
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Im thinking the current jug may have been re-sleeved, because all the gaskets were replaced and it still gets coolant on the plug ,but only after its warmed up and has pressure in the cooling system.

Where is the cheapest place to just purchase a OEM jug?
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Old 11-15-2008, 11:18 AM
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Cant beat service honda for cheap oem...

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Old 11-16-2008, 07:38 AM
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Whats the diff between the A and B jug? I know this bike has a wiseco piston in it, so I will not be able to tell if thats a A or B.What do I do?
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Old 11-16-2008, 09:48 AM
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There should be an A or a B stamped on your cylinder some where. The clearance between the two cylinder are slightly different and will need a matched piston to work properly (A cylinder would need an A piston, B would use a B)
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Old 11-16-2008, 03:33 PM
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Quote:
Originally Posted by OrangeF150 View Post
Whats the diff between the A and B jug? I know this bike has a wiseco piston in it, so I will not be able to tell if thats a A or B.What do I do?
Around 15 thousandths and your letter designation is on the side of your jug not the piston as crdude stated.

As long as you put a wiseco back in dont worry about it. Wiseco doesnt use letter designation, universal in A,B & C. If you go with oem, match it up. An exception to this would be if your using a slightly worn (a) jug and tossing a (b) piston in to take up the extra slop.

Last edited by ClosedCasket; 11-16-2008 at 04:12 PM.
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Old 11-16-2008, 03:49 PM
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So if I get a OEM jug..I can use ANY wiseco, stock bore, piston in it? If A and B piston and jugs from Honda are different sizes, how can only 1 Wiseco piston fit both?
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Old 11-16-2008, 04:12 PM
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So if I get a OEM jug..I can use ANY wiseco, stock bore, piston in it? Indeed sir. [Only registered and activated users can see links. ]

If A and B piston and jugs from Honda are different sizes, how can only 1 Wiseco piston fit both? The difference between A & b cylinders is very small(near 15 thousandths) and wiseco after thermal expansion will fill the hole, best i can explain it

An excerpt from gorr's book:

The japanese manufacturers use a letter designation system for plated cylinders. They intend for you to order a replacement pistons based on the letter designation printed or stamped on the jug. In mass production, you cant guarantee that all parts will be exactly the same size. The size variance is based on the acceptable level of quality. Tool bits become dull, temps of machine tools change through production runs, and machine operators have inconsistent performance. The jap manufacturers have two to four different-sized pistons and cylinders, normally labeled A ,B ,C & D. If they only had one size, the piston to wall clearance would only vary between 0.001 and 0.006 in. In the standard jap alpha labeling system, "A" denotes the smallest bore or piston size, and every letter after that is slightly larger usually in increments of 0.0015 in. If you try to put a "D" piston in an "A" cylinder wall clearance will be so tight that a seizure might occur.

Last edited by ClosedCasket; 11-16-2008 at 04:20 PM.
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Old 03-18-2010, 08:20 PM
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If I were you I would go with the Wisco piston over oem. The Wisco is a forged piston as the stock is cast. It is not uncommon for oem pistond to be out of round. The first thing I did when I purchased me 03 CR250 new is replace the stock piston with a Wisco. Don't get me wrong, I think Honda makes a great engine, but the stock pistons tend to grenade.
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Old 03-18-2010, 11:52 PM
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.0015" is like saying 1 and half thousandths. 15 thousandths would be a really, really big difference,,like a spark plug gaps difference. that would really make you wonder about quaility control.

in the past many people have run the a pistons in b jugs to prevent seizure when little breakin was going to be available.

I would ascertain for sure whether yours has been sleeved or not. it may workout if it has to just have it bored and go oversize on the piston. not my first choice, but you may want to do it to get some more life out of it before you spend the money on a new cylinder.

like 400 says,,,get the manual before you proceed.
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Old 03-19-2010, 01:45 AM
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Make sure the cylinder needs to be replaced. That can be pricey. The coolant leak could be from an improper previous rebuild or lack of proper maintenance.

Coolant on the plug? Is it burning coolant (white smoke) or cutting out due to a wet plug? Burning would point toward a main seal, possible for an older bike. Wet plug would lead me to believe the head was not torqued correctly or checked after break-in.

If it is indeed a bad, sleeved cylinder, boring or a re-sleeve could be an option.

The H.P. Bikes guys did a CR125 2001 budget racer for a writer on TwoStrokeMotocross.com just last year. Thier insight and services could be beneficial to your situation. The 2001 CR125 was prone to a few shortcomings. Bad case volume along with some other porting and jetting issues aided to the complete lack of low end. Eric Gorr addressed some of this in one of his books. The 2-stroke mx article on the bike is here: [Only registered and activated users can see links. ]

Good luck . . . Hope you are up and running soon.
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Old 03-20-2010, 12:24 AM
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If you have a slieved cylinder now, you can't get it plated. You have to simply replace the slieve. LA slieves is a good place to start (ebay).

You said replace the head, what's wrong with the head??
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Old 03-22-2010, 11:04 PM
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Quote:
Originally Posted by ossagp1 View Post
.0015" is like saying 1 and half thousandths. 15 thousandths would be a really, really big difference,,like a spark plug gaps difference. that would really make you wonder about quaility control.

in the past many people have run the a pistons in b jugs to prevent seizure when little breakin was going to be available.

I would ascertain for sure whether yours has been sleeved or not. it may workout if it has to just have it bored and go oversize on the piston. not my first choice, but you may want to do it to get some more life out of it before you spend the money on a new cylinder.

like 400 says,,,get the manual before you proceed.
Oooooooooops lol Slight clerical error there in my post, big difference between .0015 & .015. Darn secretaries
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