CVT Sleeve Dia. By frmrwiseguy (Read 396 times)

[frmrwiseguy]

I have measure both the OE and a aftermarket CVT sleeve.
I find both not the 24mm or .9449 they should be.
It measured 23.975mm or .9439 inch.
I have sourced a tool steel sleeve that is a true 24mm.
This will tighten up the clearance nicely.
The cool thing is its 34.4 grams lighter thus reducing engine revolving weight. thats more than a ounce!
Agan this should be in the CVT section but I'm not understanding the Library member thing.

[Alleyoop]

Well if you have worked on them before you will find that they always ROUND up the numbers for everything. If they say its a 61mm piston it is not a true 61mm etc.. same with the ccs they claim when they say 300cc or 150cc or 50cc they are not they are lower.

Concerning the Library Thing it is not a members thing. Only the Owner of this forum has that privilege. That is why you can put things in the TIP and TRICKS section and the OWNER decides if it is worthy of noting it in the appropriate Library section. He checks it now and then and moves it or does not move it.
The one that put it there might think and or believe it belongs in the data section but it is not his call. It may just stay in the Tips and Tricks section like many on there now.

Otherwise the library DATA section will get all kinds of BS that is really not helpful to anyone or worth noting. Many even in the TIPS and TRICKS now go in and start asking questions and just cluttering a Tips and Trick thread and or post.

What they should do is open a thread for their question and mention what they read in the Tips and Tricks section.

Many times if a Tips thread gets all messed up with questions we create a new thread in their Scoot section and move the questions there and it will show up as if they did it.
Alleyoop

[frmrwiseguy]

agree and disagree.
A old Yam. RD350 and 400 had the same bore and stroke. the 400 was only a name not a engine displacement.
These are Metric machines not inch.
Bore size does not indicate piston size.
With modern plated cylinders with a fixed bore size the piston must be made to fit the metric bore.
Back in the day you could get a A-D cylinder size.
Pro-X and Vertex piston made replacements for correct clearance or if you had a slightly clapped out bore (.0005) you could obtain a fatter piston to obtain correct piston to cylinder clearance.
The rounding up or down is only done in USA and in inch sizes.
Anyhow I will be making up several of these sleeves for this winter's tear down to do a batch of DLC coated components.

[Alleyoop]

All that you said DOES NOT APPLY TO THE SCOOTS BRO, this is a SCOOT FORUM not a car forum where motors are built with tight tolerances. IF you build your motor with how you want it takes money and equipment and a lot of trial and error. What I am saying all of what you want to do will not get you much in return, just the fact that you yourself did this and it works and you will feel proud of your achievement. To many of us they are just toys and we work on them as a hobby and have fun doing it and get out and get the wind in our face. As always most are always looking to mod them to get more speed out of them without breaking the bank. Some have more resources than others and can do a bit more but most do not and do the best with what they have and or can afford.
Alleyoop

[tvnacman]

Aug 28, 2013 15:28:28 GMT -6 frmrwiseguy said:

agree and disagree.
A old Yam. RD350 and 400 had the same bore and stroke. the 400 was only a name not a engine displacement.
These are Metric machines not inch.
Bore size does not indicate piston size.
With modern plated cylinders with a fixed bore size the piston must be made to fit the metric bore.
Back in the day you could get a A-D cylinder size.
Pro-X and Vertex piston made replacements for correct clearance or if you had a slightly clapped out bore (.0005) you could obtain a fatter piston to obtain correct piston to cylinder clearance.
The rounding up or down is only done in USA and in inch sizes.
Anyhow I will be making up several of these sleeves for this winter's tear down to do a batch of DLC coated components.

What is DLC , I hope its not boric acid .
I think the sleeve is made from aluminum not to wear the crankshaft .

John

John

[frmrwiseguy]

With all due respect these are metric machines. with Metric measurements and tolerances.
I'm not here to WOW peeps with my credentials, but they run deep.
I'm hear to learn what I dont know and share my 30+ years in the Motorsports Industry and provide technical data with what I have first hand experience in, both metric and inch.
agreed they are not sbc's, they are metric and I inspect and expect they should have correct metric tolerances.
I worked many years for a manufacture that supplied components to metric bikes, back in the day the oversizes were numbered and stamped in inches, .010, .020, .040 ect. if you do the conversion .020 does not equal .5mm it =.0197 and so on. These days a piston must fit a bore size with the correct clearance. again back in the day a tray of components could vary up to .002, now mfg can make 2,000 pieces that don't vary .0002
My resources also run deep and I get paid to do these types of builds with very little cost. Lucky me, and I have paid my dues along the way.
CVT sleeve $7.49 tighter tolerance and a 34.4 gram weight savings.
This is my toy and commuter and I'm excited for the upgrades.
The build is as much fun as the ride ;D

[frmrwiseguy]

The sleeve is made from Tool steel.
DLC stands for Diamond Like Carbide.
This wil last forever in the scoot application
Not cheap.
I will gather a bunch of components to do a batch this winter,

[scooterbob]

I too played with high end toys. Cost a ton of money and got to be a 24 hour headache I play with small engines and scooters just for me. Not to win or lose just to tinker with no pressure or dead lines and it's all just a lot of fun. Not to mention low $. May we all enjoy the fresh free wind. Oops forgot my CVT works great with 8 gram weights. Scooterbob round pants. I'm old and have couple of loose wires.

[frmrwiseguy]

In addition, If you have any experience in the Automotive field, referring to Iron block Big Blocks or Small blocks you would know a tight piston to cylinder clearance is .003, usually .004-.005 much looser tolerances than Jap/Chinese bikes or even there lawn equipment.
I can set up a modern full blown Factory 250F sx/mx'r at .0018.
Same with a F-Extreme 600 or 1k Superbike. so in short the metrics have much tighter tolerances than the Auto market.
As expected I'm just finding sloppy manufacturing that can be corrected with very little$$$$. I think this would be a benefit to all.
My scoot as yours is also my hobby,toy and commuter.
Good Day!!