Sold CMB 67 Twin Plug BRAND NEW

[Mario Johnston]

CMB .67 twin plug BRAND NEW w/carb, hasn't seen fuel or water.
Comes as you see it. $300 shipped to you
(Within c.U.S.)

 

[topfuel443]

Fantastic engine!

 

[James E Beasley]

If the bearings are smooth I'll take it.

 

[Mario Johnston]

Bearings are brand new, as smooth as they should be

 

[James E Beasley]

OK, PM me pmt info

 

[TJ Hammons]

Dang! Second in line if it falls through...

 

[Jay Stone]

Get that rotor clearance down and these are awesome engines. Good snag...

 

[FloridaScaleBoater]

I have heard this many times about Zimmerman disc engines.
How do you reduce, set rotor clearance on this style engine?

Get that rotor clearance down and these are awesome engines. Good snag...

 

[Danny King]

I have heard this many times about Zimmerman disc engines.
How do you reduce, set rotor clearance on this style engine?

Deck the case so the front housing sits closer to the disc.

 

[FloridaScaleBoater]

Deck the case so the front housing sits closer to the disc.

Machining of the case is required?
How do you measure the clearance?

 

[Wasted wages]

Caliper or depth micrometer...

 

[RonVanWagnen]

Plasti gauge

 

[Mario Johnston]

Sold to James

 

[mrgary]

always used a feeler guage

 

[Jay Stone]

Machining of the case is required?
How do you measure the clearance?

Always used a depth micrometer. I would use silicon carbide sandpaper on a square/glass flat surface, then do figure 8's with equal pressure. I had some 90's that had like .015" clearance - I would take off .010" to .012"..

 

[Timbo Whalen]

Get that rotor clearance down and these are awesome engines. Good snag...

They also need a little work with the wrist pin/rod interface, too...if you want them to live.

 

[Alan Elzer]

I HAVE PARTS FOR THESE ENGINES !!
PISTON/SLEEVES, CRANKS, CASES, FLYWHEELS, COOLING JACKETS, LOTS OF BUTTONS, CAGE NEEDLE BEARINGS....

 

[Stevegross]

I HAVE PARTS FOR THESE ENGINES !!
PISTON/SLEEVES, CRANKS, CASES, FLYWHEELS, COOLING JACKETS, LOTS OF BUTTONS, CAGE NEEDLE BEARINGS....

Have any parts for the 90?

 

[Alan Elzer]

Editing: they are new parts.

 

[Timbo Whalen]

Always used a depth micrometer. I would use silicon carbide sandpaper on a square/glass flat surface, then do figure 8's with equal pressure. I had some 90's that had like .015" clearance - I would take off .010" to .012"..

Glass isn't as flat as people think it is.
If one is going to stick with rc boating, a $55 investment in one of these granite tool room grade 'B' inspection plates is perfect for lapping. They have bilateral flatness +/- .0001".

https://www.grizzly.com/products/grizzly-9-x-12-x-3-granite-surface-plate-no-ledge/g9648