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-   -   Cylinder Hone for twostroke (http://www.advrider.com/forums/showthread.php?t=864769)

DGW 02-20-2013 05:24 PM

Cylinder Hone for twostroke
 
The Asrto is getting a new ring for the season. I'm looking for a hone with long stones. Any I have found are all 3" stones. I think that could be a problem passing over the ports. Any info out there ?



http://i245.photobucket.com/albums/g...psea99b028.jpg

anotherguy 02-21-2013 05:31 AM

Are you talking about sizing the bore or prepping for new rings?

If you're just prepping the surface for rings a ball hone will do the trick.

Sizing the bore is a different story. It's not the length of the stones it's surface area that does it right. You'll need a double stone/guide set-up for sizing to keep the stones from hanging in the ports. These things make doing big bore smokers a pleasant job. Small and medium bores are downright fun with this deal.

Here's a photo on a Sunnen AN-600 head.


DGW 02-21-2013 05:45 PM

I have two years racing on a new bore and piston. I pulled the top end to check everything, so best to put in new rings. I can still see the hone marks on the bore. I was thinking it best to give it a clean up with new rings. If a ball hone will do the job thats terrific.

anotherguy 02-22-2013 05:43 AM

What kind of rings? Tell me and I'll let ya know what grit.

darmst6829 02-22-2013 10:44 PM

Quote:

Originally Posted by DGW (Post 20780745)
I have two years racing on a new bore and piston. I pulled the top end to check everything, so best to put in new rings. I can still see the hone marks on the bore. I was thinking it best to give it a clean up with new rings. If a ball hone will do the job thats terrific.

Leave the bore alone and just stick new rings into it. The motorcycle will run better then trying to make it better by honing the cylinder. In my humble opinion and years of experience.

Dave

anotherguy 02-23-2013 12:20 PM

nah...........:norton

DGW 02-23-2013 06:28 PM

The cylinder do's look really good. I'm running a two ring Wisco piston.

anotherguy 02-24-2013 07:39 AM

Is the top ring a chrome faced ring? If so 320 grit. If it's a moly (bright gray in color) faced ring 240 grit.

They are moving towards a much finer finish than older ringsets. When I don't know I always defer to the manufacturer and every ring manufacturer recommends preparing the bore surface for a new ringset.


Cleaning after the preparation is important. Wash in hot soapy water,dry with compressed air. Then using a lint free towel with WD-40 wipe from the bottom to the top changing the wiping surface until it comes out clean,i.e. no gray honing remnants.

There's no reason to try something that isn't recommended and risk the cylinder in a nice Astro.

supershaft 02-24-2013 02:53 PM

Quote:

Originally Posted by darmst6829 (Post 20790010)
leave the bore alone and just stick new rings into it. The motorcycle will run better then trying to make it better by honing the cylinder. In my humble opinion and years of experience.

Dave

+1

anotherguy 03-01-2013 04:53 AM

Quote:

Originally Posted by darmst6829 (Post 20790010)
leave the bore alone and just stick new rings into it. The motorcycle will run better then trying to make it better by honing the cylinder. In my humble opinion and <s>years of experience.
</s>incredible luck

dave

ftfy

supershaft 03-01-2013 01:50 PM

What do you call incredible luck when most everyone has it? :D

CharlieT 03-02-2013 05:19 AM

Get one of these:

http://www.sherbournemews.com/wraith...s/IMG_1315.JPG

Called a brush hone or flap hone.

Disagree with the gentleman above who stated do nothing. Smokers will develope a glazing on the cylinder walls. Even though you can still see the hone marks, new rings will seat much better and maintain compression longer if you deglaze the cylinder walls first. You only need to run the brush hone thru it for maybe 15-30secs to do this. You will not dimensionally alter the cylinder or damage the existing hone marks, nor will it damage the port edges. All it will do is deglaze the cylinder.

If you have small dainty hands, you can acheive the same thing with some soapy water and a scotchbrite pad. Just do a google search on deglazing a 2-stroke cylinder and you'll find plenty of info and alternatives.

anotherguy 03-02-2013 05:39 AM

It's what you cannot see that is bad. The peaks of the finish wear as well as valleys between the peaks fill with wear debris. A renewal of the finish is required for the rings to seat properly.

Two-strokes are hardy beasts by and large however the pictured bike is a Bultaco Astro,a vintage race bike. If you want to win,hell if you want to finish the bike must be all it can be.

supershaft 03-02-2013 06:02 PM

IMO renewing the surface is mostly just going to get you that much closer to needing a bore job that much quicker. I have seen too many rings seat perfectly on untouched used bores. One thing is for sure, if by some odd chance the ring(s) doesn't seat after just replacing them, it only takes a few minutes to go back and do it differently. You might very well need a piston and/or bore job versus a hone job.

anotherguy 03-03-2013 06:55 AM

The Flex-hone is not for material removal. It's for surface preparation as is the brush posted earlier.

When the Flex-Hone is used properly measuring any bore enlargement requires tools I'm certain you don't possess. When used improperly it will take hours and hours to remove any appreciable material.

Even using the 2 stone set up pictured above I can remove half-tenths when sizing a bore. And can measure them too.

To the OP and others. My apologies for the explanations. But when charlatans offer bad advice I feel compelled to keep it from being considered good advice. Just because it makes noise doesn't mean it's right.


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