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  73 Blizzard Twin jack shaft have me wondering
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   Author  Topic: 73 Blizzard Twin jack shaft have me wondering  (Read 210 times)
72 Blizzard 340
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73 Blizzard Twin jack shaft have me wondering
« on: September 5, 2018, 04:51:26 PM »
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I've seen three different styles of jack shaft in 73 blizzard twins. One is the webbed style that runs across the chassis as you would see in the larger blizzards.  Another has two separate brackets no conjoined parts like the first one mentioned. The break mounts high on the chain case. The other is the same as the second but the brake mounts low on the chain case. Which one is proper for the twin style blizzard? Do they vary between cc? I have seen a very nice original 340 winter sled with the two separate brackets. I have also seen a 340 being raced with the webbed style.
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John Taylor
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Re:73 Blizzard Twin jack shaft have me wondering
« Reply #1 on: September 8, 2018, 05:25:10 PM »
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Here is what I have found and from owning 73 Blizzards:
298= small webbed style
340/440 = no webbing  (only the one bracket over by the secondary, like a 73 f/a tnt)
645/797 = large webbed ones just like the 72 Blizzards

I would be curious to see if anyone had a 340 with the small webbed one, for I haven’t out the ones here in the Midwest.

John
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My stuff:
# Phil Mickelson's Open Class alky Blizzard he ran from 1970-'72.
# Larry Rugland's factory 1976 Ski-Doo 440 liquid Sno-pro, starting resto
# 1999 Mini-Z for when the grandkids visit
# 1975 Can-am 125 T'nt
72 Blizzard 340
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Re:73 Blizzard Twin jack shaft have me wondering
« Reply #2 on: September 10, 2018, 04:54:06 PM »
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I wonder why they didn't put a webbed style on the 440s and 340s. Ive heard that the sleds where manufactured from biggest to smallest CC wise. Maybe they didn't add them on till the 440s started having bulkhead issues. Would the small webbed style fit on all the rv style blizzards?
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John Taylor
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Re:73 Blizzard Twin jack shaft have me wondering
« Reply #3 on: September 12, 2018, 10:40:00 PM »
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John, what do you mean by the "RV style Blizzards"?
Also, I should note that the small webbed style on the 298 had the unique small spline gear end on the jackshaft  - which were a pain at the races, for they used a special top gear that always seemed to be mixed in with the" normal" gears in the tool box - lol.
« Last Edit: September 12, 2018, 10:41:47 PM by Blizzard GR » Report to moderator Logged

My stuff:
# Phil Mickelson's Open Class alky Blizzard he ran from 1970-'72.
# Larry Rugland's factory 1976 Ski-Doo 440 liquid Sno-pro, starting resto
# 1999 Mini-Z for when the grandkids visit
# 1975 Can-am 125 T'nt
72 Blizzard 340
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Posts: 820



Twins

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Re:73 Blizzard Twin jack shaft have me wondering
« Reply #4 on: September 13, 2018, 05:24:23 PM »
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By RV i mean the twin style rotary valve 73. Would that jack shaft fit the 340 and 440 with out modification?
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John Taylor
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Re:73 Blizzard Twin jack shaft have me wondering
« Reply #5 on: September 13, 2018, 05:51:20 PM »
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Yes, but you will need the inner chaincase to match what you put in, because of the brake mounting. But all 3 jack shaft styles will fit in those twin Blizzards  (and the big triples chassis, too)

John
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My stuff:
# Phil Mickelson's Open Class alky Blizzard he ran from 1970-'72.
# Larry Rugland's factory 1976 Ski-Doo 440 liquid Sno-pro, starting resto
# 1999 Mini-Z for when the grandkids visit
# 1975 Can-am 125 T'nt
72 Blizzard 340
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*****

Posts: 820



Twins

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Re:73 Blizzard Twin jack shaft have me wondering
« Reply #6 on: September 15, 2018, 01:15:38 PM »
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Thanks for the info John!

John
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John Taylor
Blizzard GR
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Debut of the new 1970 Blizzard in fall of 1969

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Re:73 Blizzard Twin jack shaft have me wondering
« Reply #7 on: September 16, 2018, 07:43:49 AM »
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Glad to help, John!

John
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My stuff:
# Phil Mickelson's Open Class alky Blizzard he ran from 1970-'72.
# Larry Rugland's factory 1976 Ski-Doo 440 liquid Sno-pro, starting resto
# 1999 Mini-Z for when the grandkids visit
# 1975 Can-am 125 T'nt
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