K90, K67, MAC67, CMB 67 crank threads???

[Chris Attebery]

Hey guys,

I have a couple collets left for my K90 and I want to know if they will fit on a K, MAC, or CMB 67.

Anybody here know?

Thanks,

Chris

 

[Ron Olson]

Chris, probably not. The Kalistratov engines use a 7mm if I'm right, The K&B's from .21 -.67 have 1/4-28 threads. I don't know what the MAC's and CMB's use.

 

[nitrotoys]

Mac and CMB Should have the same threads.

My swap from .21s had the same, guessing the larger ones have the same as well. and i dont think i would fit, as its america threads not metric, but hell who knows now a days.

Tom

 

[TimD]

K67, K82, K90 all use the same thread as Picco, CMB, MAC. It is a metric thread.

I have 4 of the above listed motors and a collet that was on a CMB that fit's them all!

Hope this helps.

Tim.

 

[Chris Attebery]

Tim D is the winner!!!

I was hoping someone would say that. That cut $15 off the price of my new scale. My wife will be happy.

Chris

 

[TimD]

Chris,

Are you running a K67 in that new scale?

Tim.

 

[Chris Attebery]

Tim,

That's the plan at this point. I've heard that they have a ton of torque, and since the timing is so low you can set them up with just about any numbers you want.

Any input would be appreciated though,

Chris

 

[Anders_Martinelle]

The thread is STD M8x1,25mm but if you have a older K45 it can have M8x1mm.

That is "fine" thread.

Anders

 

[Roy Munoz]

Chris ..The one on our CMB,s cams Gold ,Purpel, and Green Heads are 8mm ,and so are the Piccos too I have an old sliver head and a blue head there 8mm.....

 

[Chris Attebery]

Thanks Guys!

Motor, hull and hardware are on the way.

Chris

 

[TimD]

Tim,
That's the plan at this point. I've heard that they have a ton of torque, and since the timing is so low you can set them up with just about any numbers you want.

Any input would be appreciated though,

Chris

Chris,

I sent you a PM.

Tim.