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Thread: Atomik MM450 1/4 scale dirt bike

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Old 12-21-2012, 11:08 PM   #21
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Default Re: Atomik MM450 1/4 scale dirt bike

I just got one too.. F you guys I can't be the one not to have one.
how come it always seems I buy myself more for xmas then I do for anyone else. Any how I don't regret it yet tell the wife fines out. There only mad for a min any how.
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Old 12-22-2012, 11:34 AM   #22
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Default Re: Atomik MM450 1/4 scale dirt bike

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Originally Posted by gofasterracing View Post
I just got one too.. F you guys I can't be the one not to have one.
how come it always seems I buy myself more for xmas then I do for anyone else. Any how I don't regret it yet tell the wife fines out. There only mad for a min any how.
A wise man once said "It's easier to ask for forgiveness, then to beg for permission"

I've been real happy with my mm450, compared to the other dirt bikes I had this one is very easy to drive.
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Old 12-23-2012, 10:22 AM   #23
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Default Rear shock tuning?

I'm trying to get this new big bore dialed in, I've got the spring matched to the suggested replacement but the piston holes are bigger on the Integy shock. If the recommended shock came with a 6 1.2mm hole piston (70wt suggested) and the Integy came with a 6 1.5mm hole piston what weight would you use?

Or do I close up two holes to get the same approximate hole area (7.06mm squared vs. 6.78mm squared) and use 70wt?

~Chip
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Old 12-23-2012, 11:53 AM   #24
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Default Re: Rear shock tuning?

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Originally Posted by WValtakis2 View Post
I'm trying to get this new big bore dialed in, I've got the spring matched to the suggested replacement but the piston holes are bigger on the Integy shock. If the recommended shock came with a 6 1.2mm hole piston (70wt suggested) and the Integy came with a 6 1.5mm hole piston what weight would you use?

Or do I close up two holes to get the same approximate hole area (7.06mm squared vs. 6.78mm squared) and use 70wt?

~Chip
I would close one of the 1.5mm holes and that will get you very close to the stock piston.

Stock piston=6 holes and 1.2mm dia(6x1.2=7.2)
Integy piston=5 holes and 1.5mm dia(5x1.5=7.5)
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Old 12-23-2012, 01:03 PM   #25
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Default Re: Atomik MM450 1/4 scale dirt bike

You have to work out the area of the holes to compare them ( pi x radius squared ), so blocking two holes gets me close. Since I had to buy two shocks I'm building one 6 hole/90wt and one 4 hole/70wt and I'll see how it goes. As I'm working the air bubbles out they seem very similar, I imagine the main difference will be in the "pack" over harsh terrain. At this point I'm stoked to try them out and see the difference (if any).

~Chip
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Old 12-23-2012, 01:59 PM   #26
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Default Re: Atomik MM450 1/4 scale dirt bike

I just figured it again using area and you are correct, blocking two of the holes will be the closest.

Let us know how it performs for you, these bikes sure are fun to run.
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Old 12-23-2012, 03:28 PM   #27
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Default Re: Atomik MM450 1/4 scale dirt bike

I can't get over how off-road capable this thing is! I've taken it through fields and up hills that I'm not sure my 5ive would have been able to tackle...it's amazing how you can hop it over rough terrain. I think once I get the hang of it "trials" type stuff migh even be possible.

I do have to say that the stock gyro bearings were shot from the get go. I had the rear wheel apart to do some detailing with the model paint and figured I'd shim out the slop that I figured was causing all the noise I'd always heard. Turns out the bearings had a ton of slop, swapped em out for some Boca green seals the LHS had and it's AMAZING how much quieter it is now.

Results of the detailing :wink)

Click the image to open in full size.

~Chip
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Last edited by WValtakis2; 12-23-2012 at 03:35 PM.
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Old 12-23-2012, 05:29 PM   #28
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Default Re: Atomik MM450 1/4 scale dirt bike

Nice detailing Chip, it looks great.

I agree some "trials" type stuff might be possible, I am amazed at how slow the bike can go without falling over and still maintaining great control.
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Old 12-26-2012, 01:11 PM   #29
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Default Finally broke something...

Deegan had a bit of a mishap and apparently left half his right foot in the field at some point I didn't notice until I went to change the battery so there's no hope of finding it and reattaching I'm sad to say

Click the image to open in full size.

Not all hope is lost though...I'm working on a prosthetic

~Chip
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Old 12-26-2012, 02:42 PM   #30
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Talking There...I fixed it!

We have the technology, we can rebuild him...we can make him better.

Click the image to open in full size.

Turned out of 1" aluminum, and then the "shock body" was sprayed with bedliner. Mostly hollowed out, weighed just under an ounce before shoe goo attachment.

~Chip
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Old 12-31-2012, 05:56 PM   #31
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Default Deegan's lost his head!

Click the image to open in full size.

Have no fear, "repairs" are already underway

Got the new Alleven micro-drive chain and tensioners installed. The adjustment is nice and doesn't seem to vary no matter how many cartwheels he does.

~Chip
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Old 12-31-2012, 07:12 PM   #32
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Default I've figured out how he can take so much punishment!

Click the image to open in full size.

Click the image to open in full size.

~Chip
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Old 01-01-2013, 12:54 PM   #33
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Default Re: I've figured out how he can take so much punishment!

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Originally Posted by WValtakis2 View Post
Click the image to open in full size.

Click the image to open in full size.

~Chip
That's great!! Call him the DEEGANATOR since he has that terminator look

Can you post a pic of the Alleven micro drive chain and tensioners? They have always made such nice parts, but I haven't seen the MM450 parts they make.
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Old 01-01-2013, 02:36 PM   #34
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You took my idea of the red eyes. I see how it is.
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Old 01-02-2013, 12:36 AM   #35
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Quote:
Originally Posted by WValtakis2 View Post
Click the image to open in full size.

Click the image to open in full size.

~Chip
Looks great!

Next time we run the dirt bikes again we need turn Derek's dirk bike into the ghost rider version. Dip his riders head into gas, light him up and let him ride!
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Old 01-02-2013, 01:38 PM   #36
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Default Re: Atomik MM450 1/4 scale dirt bike

Pic of the Alleven setup
Click the image to open in full size.

~Chip
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Old 01-03-2013, 09:06 AM   #37
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Default Re: Atomik MM450 1/4 scale dirt bike

Chip the Alleven set up looks great, thanks for the pics!
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Old 01-03-2013, 09:18 AM   #38
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Default Re: Atomik MM450 1/4 scale dirt bike

I'm liking it a lot, I had to tighten it up a bit after the initial stretching but now that it's settled in its maintaining my set tension perfectly.

~Chip
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Old 01-03-2013, 03:14 PM   #39
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Default Re: Atomik MM450 1/4 scale dirt bike

Damn...because of you guys, I had to pick one up. Anyone buy another battery yet? Any suggestions on a backup battery???
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Old 01-03-2013, 04:55 PM   #40
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Default Re: Atomik MM450 1/4 scale dirt bike

i have 2s 5000-6000 mah 30-60c lipo batteries for my other rc cars that work great! 20 minute run times and enough power to pop wheelies! Tons of fun
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