C7 to SC10-I Suspension Swap 93 Grand Touring PRS Chassis - Snowmobile Forum: Your #1 Snowmobile Forum
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post #1 of 17 (permalink) Old 02-05-2010, 12:44 PM Thread Starter
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Thumbs up C7 to SC10-I Suspension Swap 93 Grand Touring PRS Chassis

Just finished the C7 to SC10-I swap into the 93 Grand Touring which is a PRS chassis
Like to say thanks to all the folks with the great posts on this board and to smallengineguy for his assistance!
This is not a really hard mod to complete and there are lots of posts on doing the mod on newer sleds
PRS use the L brackets on the front which make it a bit more interesting.
The 93 Grand Touring came with a 16" x 121" track so the tunnel is wider than some of the newer sleds
The front L brackets provide a 1/2" spacer on each side
They need to move down 1 inch and back 4 inches to give enough clearance between the drives and the front of the skid. Just take the L brackets mark a 1" line and straighten them out in a vice and then rebend the bracket 1" shorter to drop the skid. On this sled the brackets end up on the rear side of 3 rivets on the tunnel.
Next
I used a piece of flat bar and marked it for the SC10 CTC of 24 3/4" and drilled it so I could mount in the front L brackets and to get the rear brackets in the right location
Mounted the Front L brackets onto the sled without the skid first but with the flat bar bolted on
This gave me the CTC mounting distance on the rear
As my sled has the wider tunnel I need to use 1/2" spacer on the back to mount the new skid
I had a spare set of front L Brackets so I straightened them in the vice and with about a 1/2" bend on the top end they fit perfect for the rear mount as to the height from the tunnel top
Put the L brackets on the front of the new skid You will have to narrow up the plugs in the sc10 skid about 1/8" to make the side to side fit properly. Measure the side to side of the old skid and make sure the new one is the same!
Couple of bolts and some steel poprivets and the job is done
I used the cross shaft in the middle of the tunnel from the SC10 I skid and mounted it in the same holes the shocks on the C7 used to ensure the track does not flop around in the middle
Hardest part of this mod is getting the new skid to push back into the tunnel far enough for the new mount holes
Use a rachet strap and pull down the front shock to give you extra room and drop the rear shock and springs down Makes the job a whole bunch easier.Keep the sled rear in the air and use a floor jack to raise the front of the skid to match up the holes worked the best for me
This took me a couple of nights to complete but I think it is well worth the effort
C7 to SC10-I Suspension Swap 93 Grand Touring PRS Chassis-skid-dimensions.jpg


Here are some pic's
http://s850.photobucket.com/albums/a...I/Skid%20Swap/

RR1

Last edited by RJ Gleason; 02-05-2010 at 01:20 PM. Reason: fix link
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post #2 of 17 (permalink) Old 02-05-2010, 01:21 PM
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Fixed your link.

Now you just need some of the completed work.

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'93 Wildcat 700EFI
w/ Comet 108 Pro-4 clutch & 01 ZR skid

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post #3 of 17 (permalink) Old 02-05-2010, 01:53 PM Thread Starter
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Red face Whoops!

I missed the most important shots
There are up on photobucket now
Now if we just got some snow here!!!

RRII
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post #4 of 17 (permalink) Old 02-05-2010, 03:42 PM
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Your link to the album was not syntaxed correctly and would not work so I edited to so that it would.


Nice work!!
The improved ride will be a very pleasant surprise to your back.

I will link this into the "how to" thread for the benefit of others.

Old Cat Rider
'93 Wildcat 700EFI
w/ Comet 108 Pro-4 clutch & 01 ZR skid

http://www.dcdrifters.net/

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post #5 of 17 (permalink) Old 03-02-2010, 09:26 AM
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Awesome conversion! I have a 93 Formula Plus which is mint, but man it needs some
suspension - would SC10 fit this? I can get this for $300. Great pics by the way,
just joined this forum & its gonna be a big help.
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post #6 of 17 (permalink) Old 03-02-2010, 09:31 AM
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Yes you can install the SC-10 in that with the right measurements from the donor sled.

Old Cat Rider
'93 Wildcat 700EFI
w/ Comet 108 Pro-4 clutch & 01 ZR skid

http://www.dcdrifters.net/

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post #7 of 17 (permalink) Old 03-02-2010, 09:49 PM Thread Starter
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Quote:
Originally Posted by Parkolad View Post
Awesome conversion! I have a 93 Formula Plus which is mint, but man it needs some
suspension - would SC10 fit this? I can get this for $300. Great pics by the way,
just joined this forum & its gonna be a big help.
You can fit an SC 10 I or SC10 II
SC10 III will required a different CTC measurement
Your Formula Plus will have the same tunnel setup as the 93 GT I believe
So L brackets rebend 1" shorter to lower the mount out of the tunnel
Move the L Bracket mount to the rear of the sled 4"
Make up a template and bolt it to the L bracket and mark your holes to the rear
Measure down from top of the tunnel per the diagram
If you intend to stud your track I would suggest lowering the rear mount an extra inch
Give you a bit more clearance

Enjoy
Best think you can do to these sleds to improve the ride
My son is thrilled with it and is doing a good deal of riding since we completed the swap. He is amazed at how well the sled handles with the new skid

RRII
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post #8 of 17 (permalink) Old 02-06-2011, 02:57 PM
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Quote:
Originally Posted by RoadrunnerII View Post
You can fit an SC 10 I or SC10 II
SC10 III will required a different CTC measurement
Your Formula Plus will have the same tunnel setup as the 93 GT I believe
So L brackets rebend 1" shorter to lower the mount out of the tunnel
Move the L Bracket mount to the rear of the sled 4"
Make up a template and bolt it to the L bracket and mark your holes to the rear
Measure down from top of the tunnel per the diagram
If you intend to stud your track I would suggest lowering the rear mount an extra inch
Give you a bit more clearance

Enjoy
Best think you can do to these sleds to improve the ride
My son is thrilled with it and is doing a good deal of riding since we completed the swap. He is amazed at how well the sled handles with the new skid

RRII
Does anyone know the ctc measurement for a sc10 III? I don't have access to the donor sled.
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post #9 of 17 (permalink) Old 02-06-2011, 04:15 PM Thread Starter
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Cool

I have seen posts for the SC10 III as CTC of 24" even and 24 1/8"
SC10 I and SC10 II are both 24 3/4"
These are all on the 121" track
If you are doing the conversion on a 136" skid the measurements are different
I beleive the measurement on the 136" is 30.5 but please do a Google search and all of your questions will be answered
This forum and a couple of others have lots of posts on SC10 conversions

A search of SC10 III CTC will get you there

Enjoy as these conversions are the best thing to happen to a C7 equip'ed sled


RRII
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post #10 of 17 (permalink) Old 02-06-2011, 04:59 PM
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Thanks for the info, it is a 121. I am really looking forward to riding this sled.
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post #11 of 17 (permalink) Old 02-17-2012, 07:18 PM
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Just bought a SC-10 1 skid and looking forward to slipping it into my 1992 Formula Plus!! This forum will be a great help. Thank to all
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post #12 of 17 (permalink) Old 02-17-2012, 07:39 PM Thread Starter
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Enjoy the SC-10
Your back will thank you!
Been a really poor year for snow here in the Sarnia Area
More rain than snow!
My son and I trailered over to Baldwin Michigan for a weekend of riding
We put 330km's on About 200 miles
The SC-10 on the old 93 took it all in stride!
Still believe it was the best thing we ever did to that Machine!
Nothing broken and our back's where not that sore!

RRII
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post #13 of 17 (permalink) Old 02-17-2012, 08:09 PM
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Glad u got some snow time in. Definitely a bad year for the white stuff. Here in SW Michigan we were only able to get out a hand full of times :-( Luckily there is always next year and it will be great running with this new suspension. My chiropractor will miss me though. LOL
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post #14 of 17 (permalink) Old 02-17-2012, 08:37 PM
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enough room for a 1.25?
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post #15 of 17 (permalink) Old 02-19-2012, 07:25 AM
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wont know until i get it in. Not sure what others with this conversion are running. would like to have enough room for studs. Anybody else know?
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post #16 of 17 (permalink) Old 02-19-2012, 07:27 AM
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1.25 should fit without studs.
If you want to use studs, 1" is all you can run in it.

Old Cat Rider
'93 Wildcat 700EFI
w/ Comet 108 Pro-4 clutch & 01 ZR skid

http://www.dcdrifters.net/

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post #17 of 17 (permalink) Old 02-19-2012, 07:30 AM
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Sounds good. Thats all i need around here. Too bad it looks like no more snow for this year
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