250r Mugen Cylinder pics

[200x Basket]

I know these are about as rare as it gets. Better save the pics because you may never see another one.

http://i2.ebayimg.com/03/i/000/da/00/5039_1.JPG
http://i16.ebayimg.com/04/i/000/da/00/5114_1.JPG

[petesatc]

thats not the proper atc/trx cylinder ......it's a 85 CR cylinder still nice but this is the real deal :D :D :D :D

[chris200x]

So the one on ebay is mislisted? someones gonna be pretty disapointed.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=004&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=140207369966&rd=1

[NOS_350X]

Already came to that conclusion over at .org

http://www.3wheeler.org/vb/showthread.php?t=30998

[chris200x]

I see the title is now revised and it says cr250 in it.

You would think the seller would mention that it does not fit the atc in the description. sneaky.....

[tecat-z]

I heard it said that only the 85 cr cylinder would work on a liquid R. Again this is only what i heard. Since the HPP didn't start til 86. The 85's ATAC was, from what i understand, simply a chamber in the exhaust pipe. So if thats true it would be in some regards the equivalent of using a kx cylinder on a Tecate. And a highly prized oem piece. I also heard that Mugen was formed by the son of Hondas founder. It was a separate but closely bonded company to Honda Motor Company. Mugen in japanese means "without limits" Pretty cool. Somewhere in this forum i've seen pics of a white stretched liquid R with a Mugen cylinder. To me this is one of the coolest of all time original old school pieces ever made.

[dunerash]

Somewhere in this forum i've seen pics of a white stretched liquid R with a Mugen cylinder. To me this is one of the coolest of all time original old school pieces ever made.
Might be mine.. My mugan cly looks like the one petesatc posted, not the one at the top of this thread. I've never seen one of those before.

[dunerash]

Post some pics of your cylinder as well...

Will the one on ebay fit an atc or not?

Here you go.. I dont know if the one on ebay will fit or not?
http://img.photobucket.com/albums/v215/dunerash/100_2319.jpg

[McDerry]

The ATAC is a chamber in the exhaust with a butterfly valve, Runs off a governor on the water pump. There is a cross drilled chamber in the jug that has a rack in it witha spring pushing it up against a cam that rides on the water pump. As engine speed varies the rack moves back and forth turning a pinion that rotates the butterfly valve. On the smaller CR motors the jugs where the same for the ATAC and Non-ATAC models casting wise, just unfinished machine work. The ATAC actually bolted onto the jug inplace of the standard exhaust coupling. Cool setup (simple and the chambers where easily swapped out on the bike for more tuning), but requires regular maintenance (cleaning to prevent the valve from sticking open).

In the top most picture the rack is actual behind the socket headed bolt at the base of the exhaust port. on the opposite side theres a adjuster like on a rocker arm that sets the fully closed position.

[Beerside]

Bump...wow, what is this Mugen Liguid cooled motor all about??

[petesatc]

here's a new pic of both mugen cylinders... CR and ATC painted in 86R colors now.....
http://i259.photobucket.com/albums/hh318/pilotpete1/DSC00946.jpg

[Billy Golightly]

Pete...are these aluminum sleeved/nikasil plated cylinders? Or are they typical cast iron setup?

[bigpimpin]

wonder what is would cost to have them recast?

[petesatc]

Yes Billy they are aluminum sleeved/nikasil plated cylinders the CR had a chrome plate but i had it taken off and replaced it with nikasil .....

[Beerside]

Hey Pete, those things look amazing!! I never knew Mugen made these. What's the deal with them? Where they made specifically for the ATC 250R or were they made for the CR? Where did you get them? Im just curious. I would imagine they are very rare.

[lndy650]

anyone have some useful pics? like showing what Mugen did with the porting?...

[petesatc]

some more pics.....and yes mugen cylinders are very rare......i have only seen a hand full in the last 10 years and every mugen cylinder has a production number stamped on... never seen a number higher than 205 for the CR cylinder and 95 for the ATC/TRX cylinder.......as for the porting only difference is in the pics the rest is the same....
http://i259.photobucket.com/albums/hh318/pilotpete1/DSC00948.jpg
http://i259.photobucket.com/albums/hh318/pilotpete1/DSC00950.jpg
http://i259.photobucket.com/albums/hh318/pilotpete1/DSC00951.jpg
http://i259.photobucket.com/albums/hh318/pilotpete1/DSC00952.jpg

[lndy650]

nice pics! i thought Mugen would have used auxillary exhaust ports instead of the shitty bridged design

[Beerside]

That's amazing Pete. That would look sick in an '86 resto racer build. I want it!! Nice Job!