Snopro 440 pump gas conversions all years of the 440 - HCS Snowmobile Forums

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Old 12-06-2009, 08:36 PM   #1 (permalink)
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Arctic Cat Sno Pro 440 pump gas trail conversions
INCLUDES ALL 440cc 2002,2002.5, 2003, 2004, 2005, 2006

Arctic Cat Sno Pro 440 set up Information and specifications.
2002 & 2002.5 Arctic Cat Sno Pro’s came in two types.

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On the low compression 2002 Snopro 440 just run pump gas and you are done.(No moddification is needed)
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On the High compression 2002 & 2002.5 Snopro 440 motor
You need to remove the Factory installed
High Compression Heads 95B3 and replace with Low compression Heads 95B1
add the oil injection system and you are finished.(these sleds came with full factory cooling systems installed)
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The odd one 2003 Sno Pro 440

This year only!!!!!

It has the high comp heads 95B3 but different porting in the jugs.
To run on pump gas all you have to do is send your CDI to Arctic Cat and have it reprogrammed.
Then rejet carbs to 310 mains.
You are now done!!!!!!!!!!!!!!!!!!!!!!!!!!!!!


If you want to run pump gas for trail use here are a few setups that work on the 2004, 2005, 2006 440 Sno pro models.
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Low compression engine conversions. You have a couple options…..

The LOW COMPRESSION setup I use in my 2005 Sno Pro 440
this will work on the 2004 & 2006 as well.

1. Using the stock 2002 Low compression heads with the code 95B1 cast in the top of the head.

2.I have the timing set to -3 Degrees using the adjusting knob. NOTEthis is done while the engine is running)

3.I run 300 - 310 main jets /with the stock pilot jets/ needle clip in the middle position.
Note: If you run this jetting with out a Holtzman Tempa-Flo the engine will load up and bog if you are running in warmer weather.
The +35F - +45F range is especialy bad.I have seen 3ft fire balls out the exaust pipe!!

4.I have a Holtzmen Tempa-Flo installed.
This compensator automatically adjusts carb jetting for all temperatures and is set to work with -20F (-29C) to +40F carb jetting for snowmobiles.
It can easily be adjusted to work with jetting for any temperature.
There is an external screw which easily provides manual altitude adjustment effective for up to a 6000 foot (1800 meter) elevation change.
I recommend this compensator for the rider who want a "set and forget" temperature adjustment.with normally less than 2000 feet of elevation change or occasional mountain riding.

Tempa Flow Installation Instructions can be found on the following web sight
<http://www.holtzmaneng.com/>
Along with vacume referance in formation and Vacuum Source Instructions

This has helped my gas mileage and I don’t have to rejet all the time!

I have run this set up down to -17F @ 960ft and up to 43+ F and have not melted an engine down and my jetting is always spot on I love it!!.

5.I run this set up without sending my CDI to Arctic Cat for reprogramming on my 2005 440 Sno Pro.

You must use Gas with a minimum octane rating of 90 - 93 Octane using the R+M 2 Method this is found on all gas pumps in Minnesota.
I try to use gas that is not Oxygenated (alcohol added) FOR ADDED SAFETY AGAINST MELTDOWN.
You do not need to run this (clear gas) if you can not get it out on the trail.
I just try to run the best fuel I can buy at the time.
This is cheaper than a melt down!!
6.Extra cooling installed.I run the minimum amount of extra cooling a 2002 snopro rear cooler mounted on my 2005 up in front under the hood on top of the airbox.
7.Track skid modifications:I have four extra low sno wheels mounted on my rear skid frame for less friction and lower hyfax wear.
8.FUEL TANK:Creation Composites 9.7 gallon trail tank.For the extra range that trail riding requires.
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440cc Sno Pro Cylinder Head Identification:

The E1 or E2 cast into the top of the head does not matter nor do the circles with the separator bar and two digits on top and bottom.

Those are the casting foundry identification numbers and the dates that the parts were cast.

Some heads have etched in information such as Proto 1 and Proto 2
These heads were early preproduction heads marked by the R&D department for testing and tracking purposes.
Low compression heads are marked 95B1
High compression heads are marked 95B3

2. Arctic Cat set up for pump gas in a 2002 Sno Pro 440

Arctic Cat says that to run the 2002 sno pro 440 on pump gas.
a. you need to reprogram the CDI by sending it to them.
b. Run the Low compression heads with the code 95B1
c. set the jetting according to the 2002 jetting chart.
3. The aftermarket set up.
Speedwerx, Inc. 20195 Greystone Ave. N. Forest Lake, MN 55025
Phone: (651) 982- 6020. Fax: (651) 982-0630.
Email: tech@speedwerx.com
<http://www.hotseatperformance.com>
They sell a set of milled out heads with two different screw in inserts (High compression and Low compression)
They claim that you do not have to reprogram your CDI if you use thier heads.
Speedworks ad bellow:

Race Sled - Pump Gas CDI Re-Mapping
Send your mod sled ignition box to us to get re-mapped. When combined with our low compression head kits, you can run pump gas and make your mod sled a trail sled!
TECH NOTE 1:
Also available for 2003 SnoPro 440 race sleds! The 2003 440 can run on pump gas with just a simple ignition re-mapping. No head change is needed on the 2003 440 SnoPro!
TECH NOTE 2:
On the 2004-2007 440 SnoPro Models, a Speedwerx head kit is required but no re-mapping is necessary! Speedwerx Head Part # AC440BH-12.8.
ID #: RPI
Price: $100.00 for the remapping only!!
Model Year Part # Description Price Dome Only Part # Price
Arctic Cat
Speedwerx head kit 4Head 40cc
Sno Pro 03-07 AC440BH-12.8
Pump Gas Conversion 0-5000 ft. Premium Fuel $395.00
Replacement Dome AC440BH-12.8D $69.00
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4. The home made Low Compression set up
For 2002 and 2004 – 2006 sno pro 440’s
a. Take your stock high compression heads 95B3 to a machine shop and have them re-chambered to low compression heads.
NOTE: (Not just cutting the squish band deeper as this will cause predetination issues!!)

b. Rejet to 310 mains
c. stock pilots
d. middle needle clip position on the stock needle
e. Add a Holtzmen TEMPA FLOWgood from +40 F to -20 F
<http://www.holtzmaneng.com>
f. with the timing set at -3 Deg
__________________________________________________ ______________________________
_________________________________________
If you do not know of a good machine shop to use or where to find one. I have been going to this shop in Anoka MN since 1979 and can not say enough good things about Bill and his shop. Thanks for all the good work and help Bill.
Bill Bune Enterprises-Anoka Minnesota-motorcycle, snowmobile, atv ...
rodwork, milling,cylinder boring, sleeving, honing, crankshaft rebuilding, head work,
www.billbune.com
__________________________________________________ ______________________________
_________________________________________
For remapping of your CDI send it to the following address:
Arctic Cat Race Department
17442 US Hwy 59 NE
Thief River Falls, MN 56701
Call the Race Shop 218-681-9884 to set this up in advance of shipping unit out to them.
__________________________________________________ ______________________________
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*** The High Compression Engine****

The High compression engine uses the heads that are marked 95B3 again the other markings for our purposes are irrelevant.

You must run 110 octane race gas with these heads!!!!

The stock jetting is between 260-280 main jets.

The timing can be set any where from +1 to +3 depending on jetting/ altitude and weather conditions /temp /baro etc….

Gains to the mid through top end can be made with the addition of after market intake systems exhaust manifolds and pipes.
These may not be legal in your class of racing so check the rules before you send the money on them if you are a racer.
__________________________________________________ ______________________________
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__________________________________________________ ______________________________
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Cooling the Sno Pro down for the trails.

The stock system is only good for Ideal snow conditions!
Think 6-12” of fresh powder not compacted down from the last one hundred riders.
There are three common types of ad on cooling systems for the sno pro’s.
1. Adding a set of running board heat exchangers from the F5 F6 F7 and
a F7 type of rear cooler which requires that you cut out a section of your rear tunnel
with interconnect hoses at the rear from the cooler to each side of the tunnel to the outer edge tunnel coolers
.
2. Adding a short extruded cooler at the rear (2002 style)with the F cat chasis type of cooler running down the boards.
3. Adding a custom U Cooler under the seat in the tunnel.
The minimum thing to add is an extended snow flap for very good snow conditions.
************************************************** ******************************
**********
Torque specs.
The torque specs for the heads are 250 in lbs or 21-25 ft lbs for the 8mm Head bolts and 6-8 ft lbs 72 - 96 in lbs for the 6mm water crossover manifold bolts and Allen head screws.

There is an Allen screw in the top of the head at the 12 o’clock position.
It is under the cooling bar interconnect manifold ends.Can be seen when you remove the manifold ends from the heads and look inside the opening.
NOTE:It is common not to see it so here is your heads up.
The heads have two O-rings on each head. (Total of four) and two gaskets on the Thermostat water manifold across the heads.
Here are some of the part numbers and the prices from A/C.
O-RING, CYL HD BLT (10 per pack)
3003-227 12 $14.15
O RING,HEAD-INNER (2 per pack)
3003-224 2 $24.55
O RING,HEAD-OUTER (2 per pack)
3003-226 2 $17.07
CYLINDER COMP,04' 440 L/C SNO PRO
3006-738 2 $644.00
GASKET,CYLINDER
3006-423 1 $13.61
SPARK PLUG, BR9EYA (BR9EYA) (10 per pack)
0217-709 2 $27.50
HEAD COMP,CYL-2003 L/C SNO PRO (inc. 2)
3006-622 2 $182.98
GASKET, THERMOSTAT MANIFOLD
3004-260 2 $5.87

NOTE: Replace the cylinder head O-rings when ever you do a head replacement.
Why risk a blown head and over heating or warping your heads and jug’s over a few bucks???

FAQ’s

How much HP loss is there with the low comp heads around 15hp?
More likely that you will loose 5-9 tops.
The stock High Compression Heads have around 170 PSI of compression on my gauge.
The stock Low Compression Heads have around 150 PSI of compression on my gauge.
I have seen customers sleds with 120 PSI that run just fine for a whole season.
You can make that back with a few little modifications like adding….
Boysen RAD Valve and reeds.
Delta V-Force Reed Valves
High Flow Exhaust systems and canisters
A good porting and polishing job can add a lot of power too.
Use all of the old tried and true methods to make power / gasket matching / tuning / timing /porting /carb mods /etc…
With these you probably won’t notice the difference if you do a good job of tuning for your conditions and elevation.
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Old 12-06-2009, 08:53 PM   #2 (permalink)
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nice gathering of info, maybe these questions might not get asked as much
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Old 12-07-2009, 06:57 PM   #3 (permalink)
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nice gathering of info, maybe these questions might not get asked as much [/b]
Doubt it. But now we have a link we can post.
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Old 02-23-2011, 03:58 PM   #4 (permalink)
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just bought an 05 sno pro 440 and want to convert it to pump gas but am going to race next year (just for fun) and was wondering if that would make a difference or if i would even be allowed.
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Old 02-23-2011, 04:04 PM   #5 (permalink)
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run pump gas wont notice a diff except in your wallet less fuel costs
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Old 02-23-2011, 06:42 PM   #6 (permalink)
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thanks I'll be converting it this summer.
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Old 02-23-2011, 07:23 PM   #7 (permalink)
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also this may seem like a stupid question and isn't to do with sleds but how do i start a thread like this person did
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Old 03-21-2011, 03:39 PM   #8 (permalink)
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Great information!!! I have a 2002 Low Compression sled that I am making into a dragger so if anyone wants to trade heads I want the High compression ones! PM me if you are interested!
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Old 03-22-2011, 09:09 PM   #9 (permalink)
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Originally Posted by SuperSonicTNT View Post
Great information!!! I have a 2002 Low Compression sled that I am making into a dragger so if anyone wants to trade heads I want the High compression ones! PM me if you are interested!
I have a set from an 05 still on the sled I would trade.
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Old 11-08-2011, 01:26 PM   #10 (permalink)
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4. The home made Low Compression set up
For 2002 and 2004 – 2006 sno pro 440’s
a. Take your stock high compression heads 95B3 to a machine shop and have them re-chambered to low compression heads.
NOTE: (Not just cutting the squish band deeper as this will cause predetination issues!!)

how much should i take off if i have to mill down the high comp heads on a 2006 sno pro 440

will .02 mean 150 psi? or 140 psi?
has anyone done the math?
has anyone done it?
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