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AR125 rotary disk valve

 
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Top-shaggy
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Joined: 05 Mar 2011
Posts: 1757
Location: Derbyshire

PostPosted: Sat Nov 10, 2012 6:38 pm    Post subject: AR125 rotary disk valve Reply with quote

I have been asked what is the difference between the Disk valve profile for 'A' model (unrestricted 21bhp) and 'B' model (restricted 12bhp) kawasaki AR125

See picture below:

Both disks are NLA from KHI in the UK

You can cut the B model disk to change the valve timing to match the unrestricted A model using this profile


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TheNewGuy



Joined: 12 Oct 2012
Posts: 58
Location: Ashington, Northumberland

PostPosted: Mon Nov 12, 2012 9:14 pm    Post subject: Reply with quote

how can i check if my bike is unrestricted?.. yes it has a swapped barrel but if the valve is different it would still be slightly restricted?
Shocked
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TheNewGuy



Joined: 12 Oct 2012
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Location: Ashington, Northumberland

PostPosted: Mon Nov 12, 2012 9:17 pm    Post subject: Reply with quote

Picture saved.. just in case i need to do some machining. Laughing
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Top-shaggy
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PostPosted: Mon Nov 12, 2012 9:37 pm    Post subject: Reply with quote

TheNewGuy wrote:
how can i check if my bike is unrestricted?.. yes it has a swapped barrel but if the valve is different it would still be slightly restricted?
Shocked


The A model barrel exhaust port is 27mm from top of barrel (restricted B model 29mm). Transfers no difference.

The A model head has a volume of 13-14ml (B model 15-16ml)

Cool
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ar125josh



Joined: 26 Aug 2013
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Location: south wales

PostPosted: Thu Aug 29, 2013 7:02 am    Post subject: Reply with quote

Would you still time it up using the arrow and mark on crank ?
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Top-shaggy
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PostPosted: Thu Aug 29, 2013 8:44 am    Post subject: Reply with quote

ar125josh wrote:
Would you still time it up using the arrow and mark on crank ?


Yes cut the B disk and then fit lining up arrow and mark on crank - unless you have significantly tuned it up and then cutting the disk / moving it a tooth on the splines needs to suit the port timing and exhaust.
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ar125josh



Joined: 26 Aug 2013
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PostPosted: Thu Aug 29, 2013 2:12 pm    Post subject: Reply with quote

Thanks, Im not planning on a major tuning just the disk valve, unrestricted head and just polishing the ports. Although I may pay someone else to do this as I have no experience of it and dont want to ruin the barrel.
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PostPosted: Thu Aug 29, 2013 4:22 pm    Post subject: Reply with quote

ar125josh wrote:
Thanks, Im not planning on a major tuning just the disk valve, unrestricted head and just polishing the ports. Although I may pay someone else to do this as I have no experience of it and dont want to ruin the barrel.


You could try Mick Abbey in Harrogate, he is excellent with the barrel and head work and not too expensive. Then maybe wait for Kenny on here to work his magic with a full power spannie Smile

(c'mon Kenny pull yer finger out, haha) Wink
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PostPosted: Mon Jan 26, 2015 8:59 pm    Post subject: Reply with quote

Not very often AR125 Rotary Disk Valves come up for sale...

Wow and the price is only going one way..

http://www.ebay.com/itm/NOS-Genuine-OEM-Kawasaki-AR-125-AR125-Rotary-Disk-Valve-12001-1063-Japan-/171657988603?pt=Motorcycles_Parts_Accessories&hash=item27f79d09fb&vxp=mtr
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ar125josh



Joined: 26 Aug 2013
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PostPosted: Mon Jun 08, 2015 4:19 am    Post subject: Reply with quote

Just found another as well http://m.ebay.com/itm/171818418033?_trkparms=aid%253D222007%2526algo%253DSIC.MBE%2526ao%253D1%2526asc%253D31354%2526meid%253Dd6a6eb2544724eff8b0210969330fc91%2526pid%253D100408%2526rk%253D1%2526rkt%253D25%2526sd%253D171657988603&_trksid=p2056116.c100408.m2460
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fazey
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Joined: 08 Aug 2015
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PostPosted: Mon Nov 23, 2015 9:01 pm    Post subject: Reply with quote

how the hell do you shape the disc valve, it looks as brittle as rock ?
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Top-shaggy
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PostPosted: Tue Nov 24, 2015 12:17 am    Post subject: Reply with quote

fazey wrote:
how the hell do you shape the disc valve, it looks as brittle as rock ?


Sounds a bit caveman.. But it can be done with good quality tin snips and then shaped / sharp edges sorted with a file. Be careful to Keep dsk as flat as possible.

Alternatively ...
This is the cheapest I've seen for ages ..

http://www.ebay.com/itm/KAWASAKI-AR125-ROTORY-VALVE-NOS-JAPAN-12001-1063-/171900419558?hash=item2806103de6:g:uUgAAOSwLVZV1aNa&vxp=mtr


If you get stuck, drop me a line and I will try to help ok
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