Thought I'd start a separate page of information specific to the D&D Sno Pro 500/720 as I've just gone through all the legwork and expense and it's fresh in my brain.  There were a lot of phone calls, emails, shipping and investigation involved so hopefully this helps others down the road. 

I plan to update/edit this post over time.   Too bad for you HCS and Vertical Scope! 

You can no longer (at this time) get pistons or cylinders for this engine from Wiseco or D&D but the guy I worked with is looking into having 720 pistons made again.  If you have a 720 and happen to destroy a cylinder skirt (common) private message me and I will provide you with contact information for cylinder repair and pistons.  Update 9/4/21 - have contact info for someone that had a small run of 720 pistons made by Wiseco.  PM for contact info.

Here's a list of specific parts required to do the top end, miscellaneous parts and additions I did and at this point would suggest.

Also, it's crucial to have the proper Boondocker settings (see below)

  

Top End

9498P8487-----Forged Pistons 84.87-----Wiseco

3347TD---------Piston Rings--------------Wiseco

S539------------Piston Pins----------------Wiseco

CW22-----------Piston Pin Circlips---------Wiseco

3008-500------Piston Thrust Washers-----Cat

3008-503------Piston Upper Rod Bearing---Cat

3006-423-------Cylinder Base/Case Gasket---Cat

3005-283-A----Power Valve Gaskets----------Cat

3004-260-------Water Manifold Gaskets------Cat

------------------Y-pipe Gaskets (2-Bolt)------Custom Cut Copper

------------------Dome O'Rings (Inner)---------75 Viton Size 153

------------------Dome O’rings (Outer)---------75 Viton Size 49

 

Add-On's or Suggested
V3112-873C-2----V-Force Reeds

5639-897---------Arctic Cat Scratchers

--------------------Side Panel Venting--------Proven Designs

--------------------Temp Gauge--------------Koso

BR9EIX-------------Spark Plugs--------------NGK
 

2602-217----------39 Tooth Lower Gear-----Cat

1602-772----------70P Chain----------------Cat

SMA-DPSSR-00-00----Vespel Slides--------Yamaha

Boondocker Settings (per D&D)

2010 - 500/720 Non-Power Valve (without 2011 & up flash)

RPM LO MID HIGH

3000 -01 -04 -05

5000 -03 -06 -06

6700 07 05 -02

7300 10 10 02

7800 15 10 02 

8250 28 28 28

8700 45 45 45

Accel -06

Dur 20

Sens 08

 

2010 - 500/720 Power Valve (without 2011 & up flash)

RPM LO MID HIGH

3000 -03 -04 -05

5000 -03 -08 -08

6700 15 11 00

7300 15 15 02

7800 25 20 02

8200 28 28 28

8700 45 45 45

Accel -06
Dur 20

Sens 08

 

2011 & UP - 500/720 (or 2010 with reflashed 2011 & up programming)

RPM LO MID HIGH

3000 02 03 10

5000 04 03 08

6700 15 11 00

7300 15 15 02

7800 25 20 02

8200 28 28 28

8700 45 45 45

Accel 10

Dur 10

Sens 08

Boondocker Instructions https://boondocker.com/pages/instructions#NA_Snow_Control_Box

Boondocker Mount http://stores.mountainfithoods.net/fuel-controller-mount-boondocker-box/

Clutching per D&D

2010 SNO PRO 500/720

MAGNAFORCE 53 BASE, PLACE MAGS 3-2-1-1,  .030 SHIM,  RED PRIMARY,  STOCK SECONDARY

D&D 200-022

Red Primary Spring (170/330)

 
Gearing/Secondary Spring/Helix Options

Stock 2010 500 

Helix is 40/38 - 0648-805
Spring is Black/Blue 180/260 - 0648-790
20/46 gearing

Belt 0627-047

Stock 2010/2011 SX 600

Helix is 68-48-36/64-48-41 0648-789

Spring is Black/Blue 180/260 - 0648-790

20/46 gearing

Belt 0627-075

Stock 2010/2011 XC 600

Helix is 44/42 0648-809 (Venom # LW420453)

Spring is Black/Orange 180/280 0648-792 (Speedwerx CCH5-J-180-280)

20/39 gearing  

Belt 0627-076 

Stock Sno Pro 500 clutching information

For 2010 replace stock orange/black pile of shit primary spring with Speedwerx CCH5-D-148-290 Green White

For 2010's update to the 2011-2014 primary weights 0746-826 for smoother engagement

Always run a GOOD 0627-047 Belt 

2011-2014 Speedwerx primary spring for lower engagement CCH5-D-122-285  (I prefer the 148-290)  

Jackshaft Bearing Timken RA100RRB 

 https://www.arcticinsider.com/sno-pro-500-part-iv-final-chapter/

https://arcticinsider.com/Images/Article/D&D 720 kit dyno sheet V2.pdf

 

Edited February 1, 20232 yr by Crnr2Crnr

That's a big gearing change, are you trying to make a lake runner?  That much change will affect clutching and it'll make it harder on your clutching.  Putting more strain on it and your belt.  I'd change the helix with that much gearing change.

Since I'm a glutton for punishment... 

Installed Speedwerx 175/315 spring, found mags at 2-1-0-1 rather than 3-2-1-1 (thanks previous owner) and moved mags to 1-1-1-1 just to test it.

Engagement is 5100 (way too high) and revs very very quickly.  Got 200 rpm back on a short run up top but ran out of real estate.  Ordered 155/300 Speedwerx spring and extra mags from D&D to test 2-1-1-1 and go from there.  Also recall Jeremy from Speedwerx posting the 076 belt may drop your rpm by as much as 200 up top. 

So it seems I'm in the right zip code, right town, heading down the right street looking for the correct address.  Like a teenage pizza delivery driver.  😆

Edited February 17, 20223 yr by Crnr2Crnr

3 hours ago, Crnr2Crnr said:

Since I'm a glutton for punishment... 

Installed Speedwerx 175/315 spring, found mags at 2-1-0-1 rather than 3-2-1-1 (thanks previous owner) and moved mags to 1-1-1-1 just to test it.

Engagement is 5100 (way too high) and revs very very quickly.  Got 200 rpm back on a short run up top but ran out of real estate.  Ordered 155/300 Speedwerx spring and extra mags from D&D to test 2-1-1-1 and go from there.  Also recall Jeremy from Speedwerx posting the 076 belt may drop your rpm by as much as 200 up top. 

So it seems I'm in the right zip code, right town, heading down the right street looking for the correct address.  Like a teenage pizza delivery driver.  😆

The 075/076 is a gripper compound than the 047

The game continues.

Venom 140-320

Speedwerx 155-300

Speedwerx 175-305

At the moment with limited testing the 175-305 engages too high (5100) but revs out to 8400 so we're going in the right direction with weights at 1-1-1-1 because that's all I had as the original owner had them at 2-1-0-1.  Ordered magnets from D&D and a different spring from Speedwerx.  

Tried the 155-300 next, weights 2-1-1-1 which was much better out of the hole and due to time didn't get to go run it wot to see where it goes.

Then, I fucked up the clutch by breaking off a tower bolt deep inside the tower.  My own fault.  Yes, tried extraction, no luck.  Have another primary clutch on the way, new weights because one set screw wouldn't budge even with heat, stripped the hole, broke a bit off in the hole.

It's been another expensive  week buying parts for the money pit. 

Hope we get a few more days of local ridable snow so I can dial it in from work and be done.  

Edited March 3, 20223 yr by Crnr2Crnr

Gave TextronCat and Bikeman some $ for amusement.  Speedwerx 155-300, BMP weights 2-1-1-1 ATM.  Short test after work without any riding gear on hardpack... pulls stout to 50 and no more room to run.  Hope we get some snow or I'm going to have to run north to dial it in.  

Edit 

D&D Magnaforce 53g and BMP 54g weights.  Profile is identical and use the same mags.

 

 

Edited March 3, 20223 yr by Crnr2Crnr

3 hours ago, Crnr2Crnr said:

Gave TextronCat and Bikeman some $ for amusement.  Speedwerx 155-300, BMP weights 2-1-1-1 ATM.  Short test after work without any riding gear on hardpack... pulls stout to 50 and no more room to run.  Hope we get some snow or I'm going to have to run north to dial it in.  

Look at that shiny feller.  Where'd you grab a new one of them so quickly?

Just now, hayward said:

Look at that shiny feller.  Where'd you grab a new one of them so quickly?

Country Cat... couldn't wait for anyone else.  They had 'more than 5' in stock.

https://minneapolis.craigslist.org/dak/snw/d/prior-lake-arctic-cat-sno-pro-500/7477933494.html

 

@Crnr2Crnr

On 3/2/2022 at 7:45 PM, Crnr2Crnr said:

Gave TextronCat and Bikeman some $ for amusement.  Speedwerx 155-300, BMP weights 2-1-1-1 ATM.  Short test after work without any riding gear on hardpack... pulls stout to 50 and no more room to run.  Hope we get some snow or I'm going to have to run north to dial it in.  

Edit 

D&D Magnaforce 53g and BMP 54g weights.  Profile is identical and use the same mags.

 

 

Finally rebuilt the clutch that's been laying around for nearly 2 years, and the weights are fubarred from the dandd 720 clutch kit.  It's like pulling teeth to try and get a set from them.  If they can't come through this coming week, you have an idea in your mind on how to get around it?  

1 hour ago, hayward said:

Finally rebuilt the clutch that's been laying around for nearly 2 years, and the weights are fubarred from the dandd 720 clutch kit.  It's like pulling teeth to try and get a set from them.  If they can't come through this coming week, you have an idea in your mind on how to get around it?  

Yep, got mine from Bikeman and a new pin kit from Cat because D&D couldn't get any last winter.  Same profile.  See pics above.

Bikeman Adjustable Snowmobile Clutch Weights

SKU: 05-GSW-5470

GSW snowmobile Clutch Weights

Arctic Cat 54-70 Grams (2004-15 Models)

GSW snowmobile Clutch Weights

Arctic Cat 54-70 Grams (2004-15 Models)

https://bikemanperformance.com/bmp-adjustable-snowmobile-clutch-weights.html

 

Edited December 17, 20222 yr by Crnr2Crnr

2 hours ago, Crnr2Crnr said:

Yep, got mine from Bikeman and a new pin kit from Cat because D&D couldn't get any last winter.  Same profile.  See pics above.

Bikeman Adjustable Snowmobile Clutch Weights

SKU: 05-GSW-5470

GSW snowmobile Clutch Weights

Arctic Cat 54-70 Grams (2004-15 Models)

GSW snowmobile Clutch Weights

Arctic Cat 54-70 Grams (2004-15 Models)

https://bikemanperformance.com/bmp-adjustable-snowmobile-clutch-weights.html

 

Thanks again  I forgot to ask them if they had the spring, but i'm pretty sure they will.  3 times in the past 10 days they 'didn't have time to go pick them up'.  whatever that's supposed to mean.  

Any of your clutches have small pins?  This used one I got last year is off a 2010 and has small pin, where as the one off my 2011's have large pins.  Luckily the kit for the 500 came with small pin weights which was fine, but I guess I need different puller for that clutch now.

I've got different shit scattered everywhere right now.

30 minutes ago, hayward said:

Thanks again  I forgot to ask them if they had the spring, but i'm pretty sure they will.  3 times in the past 10 days they 'didn't have time to go pick them up'.  whatever that's supposed to mean.  

Any of your clutches have small pins?  This used one I got last year is off a 2010 and has small pin, where as the one off my 2011's have large pins.  Luckily the kit for the 500 came with small pin weights which was fine, but I guess I need different puller for that clutch now.

I've got different shit scattered everywhere right now.

get the Speedwerx 155-300 spring I have listed above, it's the same Speedwerx spring @Not greg b ran on his F7 Conversion.  

https://speedwerx.com/speedwerx-h5-alloy-primary-clutch-springs-arctic-cat-polaris.html

 

1 hour ago, Crnr2Crnr said:

get the Speedwerx 155-300 spring I have listed above, it's the same Speedwerx spring @Not greg b ran on his F7 Conversion.  

https://speedwerx.com/speedwerx-h5-alloy-primary-clutch-springs-arctic-cat-polaris.html

 

when a "clutch kit" says in the instructions to 'add step shim with the smaller part facing towards post, bigger shim part goes towards spider'

I'm assuming add means keep the old washer there and add the kit washer also?  Or remove the old washers and just add the new one?

This old clutch had 3 in it when it came apart.  A thin shim, what looks to be the original on top of that, then two more full width thin washers on top of those, then the spider.

Da fuggggh?

3 hours ago, hayward said:

when a "clutch kit" says in the instructions to 'add step shim with the smaller part facing towards post, bigger shim part goes towards spider'

I'm assuming add means keep the old washer there and add the kit washer also?  Or remove the old washers and just add the new one?

This old clutch had 3 in it when it came apart.  A thin shim, what looks to be the original on top of that, then two more full width thin washers on top of those, then the spider.

Da fuggggh?

I didn't shim the spider in the brand new clutch, probably won't. 

Had a conversation with someone and with the XC belt he said don't bother.   

 

 

4 hours ago, Crnr2Crnr said:

I didn't shim the spider in the brand new clutch, probably won't. 

Had a conversation with someone and with the XC belt he said don't bother.   

 

 

I actually found that video and watched it earlier this afternoon.  It's a good one.

On 12/17/2022 at 3:02 PM, Crnr2Crnr said:

Yep, got mine from Bikeman and a new pin kit from Cat because D&D couldn't get any last winter.  Same profile.  See pics above.

Bikeman Adjustable Snowmobile Clutch Weights

SKU: 05-GSW-5470

GSW snowmobile Clutch Weights

Arctic Cat 54-70 Grams (2004-15 Models)

GSW snowmobile Clutch Weights

Arctic Cat 54-70 Grams (2004-15 Models)

https://bikemanperformance.com/bmp-adjustable-snowmobile-clutch-weights.html

 

Scratch that.  Bikeman out of them until 3-4 weeks.

Any other options?

6 hours ago, hayward said:

Scratch that.  Bikeman out of them until 3-4 weeks.

Any other options?

@Tommcat, have any Goldstars available?  I would have gotten them from Tommy but he was out last March as well.

Edited December 19, 20222 yr by Crnr2Crnr

Yo @hayward... I have two good/useable ones left.  PM me if @Tommcat can't hook you up. 

Edit, have a spare red venom as well that I ran for one ride in the 500 due to no other choice.  Original D&D on the left.

 

Edited December 19, 20222 yr by Crnr2Crnr

6 hours ago, Crnr2Crnr said:

@Tommcat, have any Goldstars available?  I would have gotten them from Tommy but he was out last March as well.

What weight? I'll look tomorrow but i think the only ones i have on the shelf are 120 grams

3 minutes ago, Tommcat said:

What weight? I'll look tomorrow but i think the only ones i have on the shelf are 120 grams

54-70 gram + weights 

I have two good D&D's left.  The third one is fawcked, set screw wouldn't come out and I tried everything.  

Dalton's?

Edited December 19, 20222 yr by Crnr2Crnr

1 hour ago, Crnr2Crnr said:

54-70 gram + weights 

I have two good D&D's left.  The third one is fawcked, set screw wouldn't come out and I tried everything.  

Dalton's?

I think I can get by with the d & d's you have if you want to part with them.  For sure 1 of mine is good maybe even 2 (didnt take them out yet).  

Mechanic at d&d today told me I could get by for now with 68 g cat weights.  

He told me the new adjustable weights are made, but the company has to polish them, test for fitment of the magnets, blah blah blah.  So I asked him if they're swamped right now making lawn mower parts or what?  This is a short season, dude!  $200+ /set you'd think they'd be hiring a night shift to make them ASAP!

30 minutes ago, hayward said:

I think I can get by with the d & d's you have if you want to part with them.  For sure 1 of mine is good maybe even 2 (didnt take them out yet).  

Mechanic at d&d today told me I could get by for now with 68 g cat weights.  

He told me the new adjustable weights are made, but the company has to polish them, test for fitment of the magnets, blah blah blah.  So I asked him if they're swamped right now making lawn mower parts or what?  This is a short season, dude!  $200+ /set you'd think they'd be hiring a night shift to make them ASAP!

get by for how much $, to just buy the right ones later?  c'mon man 

make absolutely sure you have one good one... 

shoot me a pm with contact info, I'll mic them tomorrow for pin hole ID and we'll figure out how to get them to ya' so you can get riding. 

winter is short  

 

 

This winter is looking like one that will be remembered.  Another storm this week 

56 minutes ago, mnstang said:

This winter is looking like one that will be remembered.  Another storm this week 

Cold as f..... too.