Do I have to hone my 02' CR250?

[toofazt]

Hi, first post, first top end rebuild. I'm putting in a new pistion because it's the same one thats been in the bike since I bought it in 2002 and I got a good price on a Wisco kit. On the cylinder I can still see the cross hatch fine. I think the cylinder on a 2002 CR250 is plated, correct? Please let me know if I need/should hone the cylinder. I need to put it back together asap. And how much $ should I expect to pay to get it honed. Thank you, Steve.

 

[toofazt]

Well I just called my local motorcycle repair shop and they said that the 2002 CR250's are nickle plated and I don't need to hone them if it's not damaged. This is what I thought, is it true?

 

[Lubeboy]

If you are seeing crosshatching, I would not hone.

PS. if you want to hone, go to the autoparts and buy a honer that goes on your drill, then hone for a few seconds yourself.

 

[toofazt]

Is there a certain type of honer I need for a nickle plated cylinder?

 

[Blue 250]

I wouldn't hone it if it looks good, why wear out the cylinder faster if you dont have to.

 

[Blue 250]

The correct hone to use would be a ball hone, 240 aluminum oxide, and 10% smaller than the bore. But like I said I wouldn't. I haven't honed a cylinder in any of my bikes upon rebuild.

 

[Rich Rohrich]

Well I just called my local motorcycle repair shop and they said that the 2002 CR250's are nickle plated and I don't need to hone them if it's not damaged. This is what I thought, is it true?

No it's not true. The cylinder needs to be deglazed to get the new rings to seal properly.


You need a Brush Research 2-5/8 (67mm) 320 GRIT STANDARD DUTY FLEX-HONE TOOL Part #BC-2-5/8 .

Flexhones are available from most big industrial suppliers like Mc Master Carr, J&L Industrial etc.

The plating in your cylinder is much harder than any standard flex hone so don't worry about wearing out your cylinder by using this type of tool. You could hone it for 2 hours and not change the piston to cylinder clearance.

The 10% under the bore size rule only applies to older "electrofusion" plated Kawasaki cylinders. The plating in those cylinders was way too thin and tend to tear away from the aluminum.

 

[Blue 250]

Well, I didnt know that. I guess you learn something everyday. So even if your cross hatch is still visible you need to do this? I've never done this and my bikes have always ran good with very good compression but my crosshatch was still very visible. So what does cylinder glaze exactly look like? Is it just shiney spots where the x-hatch isn't visble anymore?

 

[Rich Rohrich]

Well, I didnt know that. I guess you learn something everyday. So even if your cross hatch is still visible you need to do this?

Definitely. You need to clear out the old oil and combustion deposits embedded in the cyliner wall.

 

[shadow171]

What would be the difference in a ball hone, rather than the flat stone type hone? What are the pluses and minuses of each. Thanks

 

[Rich Rohrich]

What would be the difference in a ball hone, rather than the flat stone type hone? What are the pluses and minuses of each. Thanks

A full size Sunnen hone with the proper stones would work fine , but it would cost more than his bike. Really well equipped shops will have them but smaller shops just can't justify the cost and will tend to use a flex hone.

The cheap little spring loaded hones you get at the auto parts store are made for lawn mower engines and the like, and it's where they should stay.

 

[toofazt]

Well hopefully mine wasnt very glazed at all because it's already half way together :(

 

[RM_guy]

You should check out this thread (at the top of this page) for the next time.
http://dirtrider.net/forums3/showthread.php?t=42210

 

[shadow171]

Thanks Rich, it's nice to have someone with knowledge to answer all of our ?s.

 

[NO HAND]

A full size Sunnen hone with the proper stones would work fine...

I have a friend who was given a small Sunnen hone. Is there an advantage to using it better than the ball hone. I asume it must be the small model because it is not very big, only is has weird linkage in the middle. Is this one better than a ball hone? Also, I was trying to find a post in your forum about honing it's called "cylinder finish" but couldn't find it.

 

[J.B.426]

Hey Rich,
JLIndustrial must be out of the 2 5/8 flex hone. I can't find it on the site no matter how I search. They have everything in between though. McMaster has one, part number 4424A378. Would this work as well as the one you referenced? I need to pick one of these up for my YZ250 when the time comes.

 

[Rich Rohrich]

JB the bigger flex hones aren't normal catalog items for J&L so you may have to call them to order. You can also order them direct from Brush Research too. http://www.brushresearch.com/Index.cfm/FuseAction/home.HowtoOrder.htm

 

[QKENUF4U]

a regualar stone hone (long stones on a spring arms) will actually remove material where as a ball hone breaks the glazing and just refreshes the cross-hatching needed to seat your rings.

 

[J.B.426]

Excellent, thanks Rich. That Brush Research site has a lot of good info. So what abrasive type should it be, silicon carbide or aluminum oxide?

 

[Tyler3386]

Not trying to steal the thread, but would the lawnmower cheap hones be fine for a moped cyl? We have an old 85 honda spree and you can feel some scratches in the cyl wall(very small but you can feel them), what would be the correct way to go about fixing it?

 

[Rich Rohrich]

a regualar stone hone (long stones on a spring arms) will actually remove material where as a ball hone breaks the glazing and just refreshes the cross-hatching needed to seat your rings.

Those hones won't resize a late model plated barrel. They are just aluminum oxide shoes on a light tension spring. You could hone till the sun burns out and you won't change the bore size with those things. The plating is just too hard .

The aluminum oxide flex (ball) hones are the best way to deglaze for the guy working at home.

 

[sandflyz]

Are 03 Cr cylinders nickel plated as well? And would this same hone work?

 

[Rich Rohrich]

Are 03 Cr cylinders nickel plated as well? And would this same hone work?

Yes and Yes :cool:

 

[Peer Lovell]

The safest thing to use is a 3M Scotchbrite pad. You can get them at any grocery store.
Buy the genuine thing, not an immitation.
Rub away until all the glazing and oil deposits are gone. Then wash thoroughly in soap and warm water. A dishwasher works great for this.

 

[soulmate33]

No it's not true. The cylinder needs to be deglazed to get the new rings to seal properly.


You need a Brush Research 2-5/8 (67mm) 320 GRIT STANDARD DUTY FLEX-HONE TOOL Part #BC-2-5/8 .

Flexhones are available from most big industrial suppliers like Mc Master Carr, J&L Industrial etc.

The plating in your cylinder is much harder than any standard flex hone so don't worry about wearing out your cylinder by using this type of tool. You could hone it for 2 hours and not change the piston to cylinder clearance.

The 10% under the bore size rule only applies to older "electrofusion" plated Kawasaki cylinders. The plating in those cylinders was way too thin and tend to tear away from the aluminum.

Hi Rich,
Can I use this hone on a 1996 CR250 cylinder also?
Thanks in advance,
Tracy