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Author Topic: Snowmobile belt size  (Read 7785 times)

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Offline thedoctor

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Snowmobile belt size
« on: May 01, 2009, 08:15:10 PM »
I am putting an old Massey Ferguson snowmobile engine in a jr dragster size sand dragster. It needs a new belt. It is a chinook model. It has a Cuyuna 297 I think. The question is, are snowmobile belts measured from the outside or inside? The old belt measures 42" on the outside by 1 1/8" wide. I know, it is an old engine, but it was free and I already had it. It runs good, snowmobiles in Missouri don't get used much. Tim ???
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Re: Snowmobile belt size
« Reply #1 on: May 01, 2009, 08:18:10 PM »
they dont really have a specific measurment, does the old belt have a number on it?
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Offline Yummi

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Re: Snowmobile belt size
« Reply #2 on: May 02, 2009, 02:42:23 AM »
This may help - The pdf document appears to have complete listings for all gates belts numbers and applications for snowmobiles.  The jpg is a snip from the pdf document.



also post up some pictures of that drag thingy...
« Last Edit: May 02, 2009, 02:44:19 AM by Yummi »
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SPEC

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Re: Snowmobile belt size
« Reply #3 on: May 02, 2009, 05:59:42 AM »
Bug's  right look to see if the numbers are still on the belt.
Unless the person that built the car set it up to the sled specs...
Otherwise a good source of info is
www.denniskirk.com
They have a really broad selection of belts for all sleds
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Offline thedoctor

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Re: Snowmobile belt size
« Reply #4 on: May 02, 2009, 07:28:02 PM »
I have Dennis Kirk snowmobile catalog. I don't know year of snowmobile. It shows 4 different belts for MF snowmobiles. The old belt is a Powerthrust 989900. I think it is the original belt. It says Powerthrust on the clutch and cover. I think it is the shortest belt they show[1 3/16" x 41 3/8"]. Thanks for the suggestions. Tim
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Re: Snowmobile belt size
« Reply #5 on: May 02, 2009, 07:29:31 PM »
Is the engine mounted? If not get a dayco 1 3/16 belt, and set the center to center distance with the belt lash, Put it were it fits in other words...
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SPEC

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Re: Snowmobile belt size
« Reply #6 on: May 02, 2009, 07:31:40 PM »
Check the cross reference page..on the belt size chart...the belt prolly started out as a 1 3/16 but more likely an 1 1/4...by 41 1/2" that was pretty common on the older sleds
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Re: Snowmobile belt size
« Reply #7 on: May 02, 2009, 07:36:38 PM »
I agree with spec, I thought you were posting the part # you found being 1 3/16 :)
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Offline thedoctor

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Re: Snowmobile belt size
« Reply #8 on: May 02, 2009, 08:09:23 PM »
The old belt measures 1 1/8", I assume it was a 1 3/16" to begin with. The ? is it measures 42" on the outside, is this a 41 3/8" belt? Tim
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In the words of my father "Never give up too soon, you might miss a good piece."

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Re: Snowmobile belt size
« Reply #9 on: May 02, 2009, 08:10:48 PM »
Man its all really a guessing game, you can return stuff to dennis kirk for like 6.00 tho, thats the plus side...
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Offline thedoctor

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Re: Snowmobile belt size
« Reply #10 on: May 02, 2009, 08:13:11 PM »
I plan on using sled craddle[holds engine and secondary] I'm lazy and this drivetrain won't be in this car too long. Sand draggers always want to go faster. Tim
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In the words of my father "Never give up too soon, you might miss a good piece."

SPEC

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Re: Snowmobile belt size
« Reply #11 on: May 02, 2009, 08:21:00 PM »
There is a method to check your actual belt dimensions
Measure the distance between the 2 clutches... if you think the belt was 1 3/16 measure that distance on the secondary...Take that distance at the top of the secondary and the distance of the primary about 3" and figure the circumfrance  divided by 2... times the centerline times 2...should put you in the ballpark
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Offline thedoctor

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Re: Snowmobile belt size
« Reply #12 on: May 03, 2009, 02:00:15 PM »
Dragster
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In the words of my father "Never give up too soon, you might miss a good piece."

Offline thedoctor

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Re: Snowmobile belt size
« Reply #13 on: May 03, 2009, 02:02:31 PM »
Old engine    I had to cut tubes to remove.
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Offline thedoctor

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Re: Snowmobile belt size
« Reply #14 on: May 03, 2009, 02:05:47 PM »
New engine   I wanted to use whole craddle, it won't fit. I will take more pictures of cutting and fitting. Tim
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In the words of my father "Never give up too soon, you might miss a good piece."
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