Dm vs cub.

[TheKidd]

Building a 475cc class motor.

 

Has anyone had hands on experience with the 4mm CP Ind 72mm bore DM cylinders for the 472cc? Is it worth the extra money? Or stick with a traditional super cub 4mm 472? Would love advice for do’s and don’t ls. First time building a dedicated class bike. Thanks.

[Tedder]

Although I haven't run those exact setups I think I can contribute some solid info backed with my own real world experience.

I'm one of the oldies here with well into the thousands of 1/4 mile passes on a 4mil 421cub, hundreds on a 465 10mil cub and I have a son that ran an almost identical setup with a 392 cub. As you'd expect there's a performance increase with each step. I'm currently in the process of building a 611DM. It uses the same 64mm crank as my 10mil but with a 78 bore but where the big gains come from with the DM over cubs is it's ability to breath much better because of the MUCH larger intake and reeds.

Good luck with whatever you decide      

[locogato11283]

Building a 475cc class motor.
 
Has anyone had hands on experience with the 4mm CP Ind 72mm bore DM cylinders for the 472cc? Is it worth the extra money? Or stick with a traditional super cub 4mm 472? Would love advice for do’s and don’t ls. First time building a dedicated class bike. Thanks.

Call Redline Racing. Cam has some very hard running Super Cubs. I had a 4mm 77 bore that was very strong. I won a lot of shit with that motor. He can set you up.

[375hp banshees]

Gotta be 450lb's, 465...done

[TheKidd]

Gotta be 450lb's, 465...done

Over a 473 DM 4mil? Why? Truly asking.


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[TheKidd]

Although I haven't run those exact setups I think I can contribute some solid info backed with my own real world experience.
I'm one of the oldies here with well into the thousands of 1/4 mile passes on a 4mil 421cub, hundreds on a 465 10mil cub and I have a son that ran an almost identical setup with a 392 cub. As you'd expect there's a performance increase with each step. I'm currently in the process of building a 611DM. It uses the same 64mm crank as my 10mil but with a 78 bore but were the big gains come from with the DM over cubs is it's ability to breath much better because of the MUCH larger intake and reeds.
Good luck with whatever you decide      

So you would suggest the dm for more air?


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[TheKidd]

Call Redline Racing. Cam has some very hard running Super Cubs. I had a 4mm 77 bore that was very strong. I won a lot of shit with that motor. He can set you up.

Is this a chubby cubby if it’s a 77? I only see 72’s on their site.


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[375hp banshees]

4 hours ago, TheKidd said:

Over a 473 DM 4mil? Why? Truly asking.


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Torque , it can be done with all. But my 465 @ over 450lb runs 3.6's

It's not how close to 475 you can get... that matters

[locogato11283]

Is this a chubby cubby if it’s a 77? I only see 72’s on their site.


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Pick up the phone and call Cameron. He can build any size you want.

[375hp banshees]

3 minutes ago, locogato11283 said:

Pick up the phone and call Cameron. He can build any size you want.

Um he's not talking 'about that kinda ...chub

[SKEETER]

Trick racing has the fastest shit. 

[375hp banshees]

3 hours ago, SKEETER said:

Trick racing has the fastest shit. 

Yeah, most orgygon holes are...wore out

[Tedder]

On 9/19/2025 at 9:12 AM, TheKidd said:

So you would suggest the dm for more air?


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Tuned correctly a ported 10mil cub (465cc) is a great setup and will be a far cheaper build than a DM. I agree that it would be worth a call to Cam (Redline Racing). Ask him how the 465 would compare to  https://cpindinc.com/parts/0101-7258-115SA?category=Yamaha_Banshee 

[trickedcarbine]

Stroke makes more torque than bore does. A 10mm 68 bore cub at 465 will beat a 472 4mm 72 bore.