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Starter / Generator on snowmobile engine?

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Starter / Generator on snowmobile engine?

Postby 91marathon » Fri May 30, 2008 3:44 pm

Has anyone ever attempted to install a Starter / Generator on a snowmobile engine such as a Rotax 377 or a Yamaha 340? and then attempted to install an E-Z-GO 3PG crank pickup on one of these motors along with the E-Z-GO CDI to allow the Snowmobile engine to operate as the original 3PG did? This is something I have been considering attempting. I was considering getting a pulley welded onto a snowmobile engine clutch to all starting with a starter generator

My biggest concerns are:
1. Will the Starter generator have enough torque to start the higher compression snowmobile engine?
2. Will the E-Z-GO CDI have a "good enough" timing curve to run a snowmobile engine
3. Will I be able to find a way to mount and E-Z-GO pickup on one of these motors? Can the original pickup off one of these motors be utilized somehow?

Any thought you guys have would be much appreciated. I am trying to find a more powerful motor for my '90 Marathon 3PG without having to add a F/R rear end into the mix

A Yamaha 340 uses a single ignition coil to fire both cylinders (must fire twice per revolution I presume) so the crank sensor must pickup a signal twice per revolution. Hmmm... Could be a problem. Then there is snowmobile engines with reverse like Polaris PERV for Skidoo RER. These engines exceed the amount of money I'm willing to spend - I'd be better off just getting a F/R rear end in this case.
1990 Marathon
22" front leafs cut to 19"
75lb/inch front coil-over shocks
14" 200lb rear springs, AC Delco shocks
2" rear coil spring spacer
Rotax 440
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Postby AGC » Sun Jun 01, 2008 9:19 am

I run an starter generator on a 400JLO. But I re wired the whole cart. and didnt use any of the original cart componants (except soliniod and volt reg.) I drilled an tapped hole on the back side of the clutch and mounted my sheeve there.

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Postby 91marathon » Sun Jun 01, 2008 8:11 pm

Excellent info. So you're using the original Yamaha Starter Generator?

Does anyone know how the EZGO 2 stroke ignition system operates? Is the "pulsar coil" a VR sensor? Is the "Ignitor" simply fire the ignition coil when it received a voltage from the Pulsar Coil? Does the timing remain the same throughout the REV range? Or is the "ignitor" actually a CDI module?

If the EZGO system operates as I believe it does then it should be simply to adapt it to any Points ignition snowmobile engine and enable the Sled motor to operate in reverse as the EZGO" motor does - assuming the starter generator has been added to the sled motor.
1990 Marathon
22" front leafs cut to 19"
75lb/inch front coil-over shocks
14" 200lb rear springs, AC Delco shocks
2" rear coil spring spacer
Rotax 440
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91marathon
 
Posts: 175
Joined: Tue Sep 19, 2006 8:24 pm
Location: Ontario, Canada

Postby 91marathon » Thu Jun 12, 2008 2:17 pm

Where did you get the pulley that you mounted on the clutch? Does the starter have any trouble turning over the sled motor?
1990 Marathon
22" front leafs cut to 19"
75lb/inch front coil-over shocks
14" 200lb rear springs, AC Delco shocks
2" rear coil spring spacer
Rotax 440
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91marathon
 
Posts: 175
Joined: Tue Sep 19, 2006 8:24 pm
Location: Ontario, Canada

Postby harleymansam » Thu Jun 12, 2008 2:40 pm

I would really like to add on a starter like too.I just dont know if i have the time :roll: Also, :lol: its not PERV its PERC :lol:
My cart is a piece.
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Postby 91marathon » Fri Jun 13, 2008 1:18 pm

Yeah,I know. When I realized I had typed PERV instead of PERC I could no longer edit the post. I'm going to have to buy a v-belt pulley of the correct size and then cut the center out of it I think. I hope my starter generator will be able to turnover my Rotax 440with it's 12:1 compression.
1990 Marathon
22" front leafs cut to 19"
75lb/inch front coil-over shocks
14" 200lb rear springs, AC Delco shocks
2" rear coil spring spacer
Rotax 440
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91marathon
 
Posts: 175
Joined: Tue Sep 19, 2006 8:24 pm
Location: Ontario, Canada

Postby COMP » Sun Jun 15, 2008 5:38 pm

91marathon wrote:Yeah,I know. When I realized I had typed PERV instead of PERC I could no longer edit the post. I'm going to have to buy a v-belt pulley of the correct size and then cut the center out of it I think. I hope my starter generator will be able to turnover my Rotax 440with it's 12:1 compression.


any lind of compression release ???
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Postby 91marathon » Sun Jun 15, 2008 10:02 pm

No. There is no kind of pressure release - most people think the motor is seized when they try to start it with the recoil! The motor does have electric start though. I might have to abandon the starter generator and just use the sled motor's magneto to charge the battery; and find myself a reverse rear end.

Image

Specs:
Type: Twin Cylinder Rotax 440

Displacement: 436.6cc
Bore: 67.5mm
Stroke: 61mm
Compression Ratio: 12:1
Horsepower: 42hp
1990 Marathon
22" front leafs cut to 19"
75lb/inch front coil-over shocks
14" 200lb rear springs, AC Delco shocks
2" rear coil spring spacer
Rotax 440
User avatar
91marathon
 
Posts: 175
Joined: Tue Sep 19, 2006 8:24 pm
Location: Ontario, Canada

Postby COMP » Sun Jun 15, 2008 10:11 pm

91marathon wrote:No. There is no kind of pressure release - most people think the motor is seized when they try to start it with the recoil! The motor does have electric start though. I might have to abandon the starter generator and just use the sled motor's magneto to charge the battery; and find myself a reverse rear end.

Image

Specs:
Type: Twin Cylinder Rotax 440

Displacement: 436.6cc
Bore: 67.5mm
Stroke: 61mm
Compression Ratio: 12:1
Horsepower: 42hp



can one be added ???
COMP
 
Posts: 18
Joined: Sat Jun 07, 2008 2:49 am
Location: so. in.

Postby AGC » Sun Jun 15, 2008 10:52 pm

You have a ring gear on your clutch. have you tried to find a starter for it? you should have a charging stator under your fly wheel. give me the bolt patern measurements for the starter mount holes. I know a fella that might have a starter for it.
If you take the pulser coil assembly from your EZ (if it fit) and put it behind your fly wheel on your rotax it would run in rev. but you will probly loose some spark capacity. and would loose your Alt.Stator
2014 Oddpowers Spring Nationals June 20-21 London, KY Dragway!!
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Postby 91marathon » Mon Jun 16, 2008 1:30 pm

I am able to pick up a brand new starter locally for $50 so I'm going to use that and just buy a 4 stroke rear end when I can afford it. Until then no reverse I guess.
1990 Marathon
22" front leafs cut to 19"
75lb/inch front coil-over shocks
14" 200lb rear springs, AC Delco shocks
2" rear coil spring spacer
Rotax 440
User avatar
91marathon
 
Posts: 175
Joined: Tue Sep 19, 2006 8:24 pm
Location: Ontario, Canada

Postby 91marathon » Tue Jul 15, 2008 3:36 pm

I have begun disassembling the motor for a freshen up. I will be installing new crank seals and new gaskets. All the bearings and the pistons / cylinder bored have checked out good. I should have the motor installed and running in about two weeks. I still need to make up a plate to mount the motor. the cart is 300 miles away so I'm relying on memory and pictures to help me build the motor mount.

Does anyone have a picture of a 244 3PG swing arm without the motor installed?
1990 Marathon
22" front leafs cut to 19"
75lb/inch front coil-over shocks
14" 200lb rear springs, AC Delco shocks
2" rear coil spring spacer
Rotax 440
User avatar
91marathon
 
Posts: 175
Joined: Tue Sep 19, 2006 8:24 pm
Location: Ontario, Canada

Postby Sho305 » Wed Jul 16, 2008 3:16 pm

Maybe too late but a guy on here did mount a G1 ignition onto a bravo 250 sled motor and it works with reverse. Also I am told the old yamaha (70s) sleds use the same basic engine up to a 400cc, of course they are all single cylinder. G1 has two pickups on crank one advanced for each direction, in one unit. I would use the sled starter/charger if possible.
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Postby 91marathon » Wed Jul 16, 2008 3:31 pm

I abandoned the reverse idea because the only way I'd by able to start the 440 in reverse is with a starter generator and my motor has crazy compression and I can bare turn it over with the recoil - too much for the stock EZGO starter IMO
1990 Marathon
22" front leafs cut to 19"
75lb/inch front coil-over shocks
14" 200lb rear springs, AC Delco shocks
2" rear coil spring spacer
Rotax 440
User avatar
91marathon
 
Posts: 175
Joined: Tue Sep 19, 2006 8:24 pm
Location: Ontario, Canada

Postby 91marathon » Sat Jul 19, 2008 4:59 pm

Here are a few pictures of my cart for those interested
Image
Image
Image
Image
1990 Marathon
22" front leafs cut to 19"
75lb/inch front coil-over shocks
14" 200lb rear springs, AC Delco shocks
2" rear coil spring spacer
Rotax 440
User avatar
91marathon
 
Posts: 175
Joined: Tue Sep 19, 2006 8:24 pm
Location: Ontario, Canada

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