1981yamaha et300 3.29 to 2.52swap/121 track

3869 Views 21 Replies 3 Participants Last post by philipgagne5, Feb 4, 2018

philipgagne5

Discussion Starter · Jan 29, 2018

Looking to swap my track for a newer 121 setup as there readily available. Are drivers available for these to go to a 2.52pitch? And how far back will I have to move the skid back to fit the 121? I'm sure this swaps been done someones gotta have time I go around.?
Thanks y'all!

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kccats

· #2 · Jan 29, 2018

Welcome!
I have done this!
I took a Phazer drive and swapped it into my Ovation!
You will want to find a 121 skid, I used my SRV skid and ugraded it.
You will need the dimensions from the donner sled.
Transfer those dimensions to your tunnel. (measure from the drive shaft and top of tunnel)
You may have to relocate the steel reinforcement brackets?
Good luck!
Post before and during Pics!

philipgagne5

Discussion Starter · #3 · Jan 30, 2018

kccats said:
Welcome!
I have done this!
I took a Phazer drive and swapped it into my Ovation!
You will want to find a 121 skid, I used my SRV skid and ugraded it.
You will need the dimensions from the donner sled.
Transfer those dimensions to your tunnel. (measure from the drive shaft and top of tunnel)
You may have to relocate the steel reinforcement brackets?
Good luck!
Post before and during Pics!

Thanks for the tips appreciated

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yamadad4

· #4 · Jan 30, 2018

If you can find the drivers(2.52 share shaft), then your ahead of the game. Ebay would be my first venue as they have been long since gone in my catalouges.

You also need to factor in a tunnel extension and a new or different rear bumper to allow for the extended track. I did some other little tricks on mine and I can tell you from first hand experience that any longer track makes those things rock!

Another slick addition is adding plastic ski skins to the steel skis. Night and day difference. I adapt phazer skins to those skis by altering them slightly for the wear bars.

philipgagne5

Discussion Starter · #5 · Feb 1, 2018

yamadad4 said:
If you can find the drivers(2.52 share shaft), then your ahead of the game. Ebay would be my first venue as they have been long since gone in my catalouges.

You also need to factor in a tunnel extension and a new or different rear bumper to allow for the extended track. I did some other little tricks on mine and I can tell you from first hand experience that any longer track makes those things rock!

Another slick addition is adding plastic ski skins to the steel skis. Night and day difference. I adapt phazer skins to those skis by altering them slightly for the wear bars.

Any tips /process to changing the track?. I just scored and almost brand new stock replacement! Il b swapping on Friday. Skid is already removed.

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yamadad4

· #6 · Feb 1, 2018

Pull t chain and gears, then the chaincase. Remove the speedo cover and bearing from the clutch side, wrestle the track up and over the drivers while pushing the driveshaft towards the clutch side. Once the driveshaft clears the chaincase side, it should drop down and come out.

Reverse procedure for the install. Check the bearing on the clutch side, those had allen head set screws if I remember correctly. May be a pia to get the set screws loose. Pre-lube and hit them with a small torch.

philipgagne5

Discussion Starter · #7 · Feb 2, 2018

yamadad4 said:
Pull t chain and gears, then the chaincase. Remove the speedo cover and bearing from the clutch side, wrestle the track up and over the drivers while pushing the driveshaft towards the clutch side. Once the driveshaft clears the chaincase side, it should drop down and come out.

Reverse procedure for the install. Check the bearing on the clutch side, those had allen head set screws if I remember correctly. May be a pia to get the set screws loose. Pre-lube and hit them with a small torch.

Tracks out and I'm replacing all the bearings while I'm in there.only bearing not yet removed is in the lower chain case.i couldn't find my snap ring pliers. No Allen heads that I found yet. Anyways.
New sliders idler bearings. All shafts greased up new belt new track fixed front skis a bit. Replacement air box and belt guard on the way. Should b a lot nicer lol

Looks like the rear slider springs are gonna b pain tho...

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kccats

· #8 · Feb 2, 2018

Check out the sticky above on track swaps!
Also those rear springs are easy with a ratchet strap.

philipgagne5

Discussion Starter · #9 · Feb 2, 2018

kccats said:
Check out the sticky above on track swaps!
Also those rear springs are easy with a ratchet strap.

I figure ratchet strap was the key lol thanks.

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philipgagne5

Discussion Starter · #10 · Feb 2, 2018

philipgagne5 said:
I figure ratchet strap was the key lol thanks.

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All I see for stickies is the phaser track swap buy doesn't give much I sight on the skid Install tricks lol but I should b fine.

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kccats

· #11 · Feb 2, 2018

Good luck and keep us posted and go ahead and ask if you get stuck!

philipgagne5

Discussion Starter · #12 · Feb 2, 2018

kccats said:
Good luck and keep us posted and go ahead and ask if you get stuck!

Belt deflection is my next question lol. Got a new belt it may b just just too tight.

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kccats

· #13 · Feb 2, 2018

It's only too tight if it creeps and squeals!

philipgagne5

Discussion Starter · #14 · Feb 2, 2018

kccats said:
It's only too tight if it creeps and squeals!

I wanna say about 1/8" above the secondary. Give er take.
And today I got all the driveshaft and jackshaft seals and bearings changed out then fought with the bearing cups on mag side of the driveshaft for 2 hours!...not sure why lol. But it's in chaincase is all sealed up. Tracks in the tunnel just have my new airbox to install. And the skid.

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yamadad4

· #15 · Feb 3, 2018

No adjustments short of moving the engine. 1/8 seems a bit high, but maybe it will roll in when your done. Actually not a bad spot, and as KC mentioned, if its not grabbing, your good. OEM belt or aftermarket belt?

Engine mounts could be whacked, be sure to check them.

Curious as to how you are obtaining parts so quickly along with finding parts. I spend more time moving sleds and storing sleds than I do putting them together waiting for parts, and not just Yam. Its a constant battle finding available real estate awaiting parts and you seem to have some sort of direct line or your gathering all the eggs to the same basket before inquiring for guidance.

Please indulge your parts sources as to perhaps expand my options.

philipgagne5

Discussion Starter · #16 · Feb 3, 2018

yamadad4 said:
No adjustments short of moving the engine. 1/8 seems a bit high, but maybe it will roll in when your done. Actually not a bad spot, and as KC mentioned, if its not grabbing, your good. OEM belt or aftermarket belt?

Engine mounts could be whacked, be sure to check them.

Curious as to how you are obtaining parts so quickly along with finding parts. I spend more time moving sleds and storing sleds than I do putting them together waiting for parts, and not just Yam. Its a constant battle finding available real estate awaiting parts and you seem to have some sort of direct line or your gathering all the eggs to the same basket before inquiring for guidance.

Please indulge your parts sources as to perhaps expand my options.

Parts are readily available through kimpex dealer local to me most stuff over night. Belt is the dayco 3021 to believe it was. Airbox and belt guard/track are used from Kijiji. Had them shipped over night. Track also Kijiji
But idler bearings chaincase bearing ets are all easy easy finds.

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philipgagne5

Discussion Starter · #17 · Feb 3, 2018

philipgagne5 said:
Parts are readily available through kimpex dealer local to me most stuff over night. Belt is the dayco 3021 to believe it was. Airbox and belt guard/track are used from Kijiji. Had them shipped over night. Track also Kijiji
But idler bearings chaincase bearing ets are all easy easy finds.

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Enticer parts are all over the place around me just sometimes a few hours drive or have them shipped.

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kccats

· #18 · Feb 3, 2018 (Edited)

I have a fairly good stash of parts myself!
But I really do understand the real estate though!
I have to plan the weather and Help to get to stuff!
I have 2 enclosed 4 place trailers just for sleds!
And a 4k sq ft shop that I just added a 3 rd loft too!
But I have my VW and my Mini truck and a sled in the shop!

philipgagne5

Discussion Starter · #19 · Feb 3, 2018

Well track and skids all installed new belt makes it run 100times better too!I also put the track on backwards as I heard they get better traction due to there design seemed too help anyone else try this?.

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yamadad4

· #20 · Feb 4, 2018

I have been installing tracks the opposite way for years. What you gain in traction, you lose for braking. The way I learned it years ago was that the tracks were more worried about whoahing than going due to liability concerns.

In my opinion, good for you for running it in grip mode, but be prepared for slip mode. It makes a big difference for traction. Half my sleds have the directional arrow facing the wrong way.

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