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**aargee** · 05-23-2010, 01:34 AM

^^^ Oh!!! Ok. Thanks for the clarification. Good luck on your restoration.

**aargee** · 05-23-2010, 01:44 AM

Sleeving the cylinder in a nut shell means, repairing the cylinder in such a way that it can be used for fitting in standard or reduced size piston from the existing large size. Now a sleeving is done only when the cylinder cannot be used any further. Ideally it should be thrown away, but still, if you sleeve it, you can run it for some more time, but will never get the performance of the original cylinder. Hope this clarifies on sleeving.

Regarding tires, there're no specific brands that I've in mind. Just go in for MRF or Ceat. They're good. Try using the regular tread pattern in the front & rear, they should be good. Let us know if you've any questions.

**aargee** · 05-23-2010, 08:37 AM

Raghgu - Hope you don't mind me posting something for SPM - Watch this video to understand on engine sleeving
Though the process is not the same, the video below will give you a fair idea on sleeving - Hoglet Sleeve Installation

After watching don't ask me if we have Dry or Flanged dry; 'cause I don't know

**spm_clt** · 05-23-2010, 01:03 PM

Thanks man.
what if instead of going for next oversize one keep the stock size by resleeving will it hamper the engine?

**jd666** · 05-23-2010, 01:08 PM

Generally a oversize will be better than resleeving, because if the sleeving is not done properly, it will create more issues than a oversize. A oversize still lets you use the original sleeve.

Whereas when a new sleeve is installed, it generally causes a loss of power, due to the unequal expansion of the sleeve and the cylinder, and also causes a lot more vibrations than normal.

**spm_clt** · 05-23-2010, 01:13 PM

thanks JD. i hope you have seen the photos of my bike can you suggest some necessary and important work for the machine?

**aargee** · 05-23-2010, 01:20 PM

Originally posted by jd666 View Post

Whereas when a new sleeve is installed, it generally causes a loss of power, due to the unequal expansion of the sleeve and the cylinder, and also causes a lot more vibrations than normal.

This is one question that I've been having; Any new cylinder also has a sleeve, why is that the sleeving by manufacturers makes it so special that cannot be replicated by us?

**jd666** · 05-23-2010, 02:15 PM

^^ because that sleeve is in place during the casting of the block, and due to difference of quality of metal. Even if you managed to remove the old cylinder completely, you cannot install a new sleeve and make it fit the way the old one did.

**aargee** · 05-23-2010, 02:44 PM

Originally posted by jd666 View Post

^^ because that sleeve is in place during the casting of the block, and due to difference of quality of metal. Even if you managed to remove the old cylinder completely, you cannot install a new sleeve and make it fit the way the old one did.

Jd - If I'm right, the block & cylinder are two different metals completely with different properties & they're not moulded or glued. What I mean to say is, the cylinder & block could be made at different point in times & the cylinder is drilled/forced/pushed into the block like any other work that is carried out in the lathe shop? So why does the quality differ?

**jd666** · 05-23-2010, 05:30 PM

^^ thats what i said, the cylinder is in place in the casting at the time of pouring the mould of the block. So it gets a perfect seal with the block, no air bubbles, and the liquid metal of the block takes up any imperfections ( microscopic ) of the cylinder completely, leaving no air gap etc.

heat transfer would be best for a complete metal to metal contact. Else there will be localised hot spots on the cylinder where heat transfer is not complete.

In the case of a sleeving, how so ever perfect it might be done, there will be some microscopic gaps between the sleeve and the block. The trapped air and improper contact between the cylinder and the block causes the vibrations to go up, and the power to drop. Also the block/cylinder/sleeve now expand unequally w.r.t each other, so that creates further issues.

A water cooled block might just work, if the temperatures are kept in check.

**aargee** · 05-23-2010, 05:49 PM

Originally posted by jd666 View Post

^^ thats what i said, the cylinder is in place in the casting at the time of pouring the mould of the block.

^^^ I doubt on this point JD; will have to recheck.

**jd666** · 05-23-2010, 07:03 PM

Engine Cylinder block materials

this might answer a very brief part, however towards the end, as to how the aluminium blocks are cast, with the liner/sleeve in place during the casting process.

**spm_clt** · 06-01-2010, 06:33 AM

4 speed barrel

how much will it cost for 4speed barrel and piston kit?

**Ray13** · 06-01-2010, 11:36 AM

Just sharing here.

If anybody in Bangalore wants a re-bore done, the man to go to is Vijaydeep on JC Road. His reboring is CNC and so is really quality precision work. My uncle has been in Bangalore and in the biking business for the last 50 years (used to work at Enfield R&D, raced at Sholavaram, started and ran the place which first brought the Ind-Suzuki to India and has a collection of lovely bikes) and he swears he will never ever go to anyone else.

Virtually everybody else, as expert as they might be, do jig-boring which is ancient technology and can never be as accurate as CNC.

It might cost more, but with parts ESPECIALLY cylinder blocks, pistons and bores, becoming rare (regardless of cost) on old two-strokes, its worth every paisa.

Cheers

Rahul

**psycho 98** · 06-01-2010, 11:28 PM

Ray13 nice to know u go there too, we usually go there and worship for our new engine life.

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