2020/21 redesigned front drive sprocket

[TIMMB]

I won't replace it till the beginning of March so I don't have anything to compare it to. But this is the redesigned one hope it's quieter!

 

[RICZ]

Not having anything to compare it with...what's different about it? Will it retrofit all 1330s? Got a part number?

 

[fatboy]

the part number is stamped into it with date pic 2

 

[ButterSmooth]

/*humor on*/ That's a new special coating that sheds red dust... /*humor off*/

 

[TIMMB]

Don't know what's different was redesigned to get rid of the whirring humming whistling noise

 

[RICZ]

Did I read that part number correctly? 105563244?
Anyone know if it retrofits all 1330s?

 

[TIMMB]

705503244

 

[Snoking1127]

Well BRP parts catalog for 2021s built after Sept 2020 list part number 705503239 and before that date part number 705502134. So is the 705503244 a third version of the part?

 

[TIMMB]

This is what I ordered but you see what came

 

[JayBros]

To my eye, and it's difficult to be certain because there is no common scale with either of the two sprockets, it appears the holes may be larger and there is obviously no raised ring on the inner circumference of the flange on the 10/20 sprocket. Larger holes probably would reduce the tone of any whistling (think flute or penny whistle notes). Just a WAG on my part. The date on the 705503244 is obviously later than the Sept 20 date mentioned in the parts catalog and I thought the "new" '21s were supposed to begin production in Jan '21. Ergo a part with a 10/20 manufacture date would be available for 1/21 production. Another WAG.

 

[Snoking1127]

To my eye, and it's difficult to be certain because there is no common scale with either of the two sprockets, it appears the holes may be larger and there is obviously no raised ring on the inner circumference of the flange on the 10/20 sprocket. Larger holes probably would reduce the tone of any whistling (think flute or penny whistle notes). Just a WAG on my part. The date on the 705503244 is obviously later than the Sept 20 date mentioned in the parts catalog and I thought the "new" '21s were supposed to begin production in Jan '21. Ergo a part with a 10/20 manufacture date would be available for 1/21 production. Another WAG.

I think OP's pictures are of the back and front side of the same sprocket?

 

[JayBros]

Very valid point, particularly noting the wrinkles in the bolt bag. Question then would be what do the new and old ones look like side by side.

 

[RICZ]

Yes, photos with the new and old pulleys side by side would be very helpful. Hint, hint.

 

[PW2013STL]

I have the same sprocket to put on my wife's 2018 F3 tomorrow. I will take a picture of the new and old sprocket side by side. The only thing I noticed was that the new one is painted, but I did not measure the hole sizes. The new one does have made in the USA printed on it. I will need to look to see if the old one has that as well.

 

[PW2013STL]

Side by side pictures.
Holes are the same size. Looks like the flange to sprocket hub is sloped compared to the old one.

 

[RICZ]

Thanks for the photos. Am I wrong, or is the new one larger?

 

[BLUEKNIGHT911]

Side by side pictures.
Holes are the same size. Looks like the flange to sprocket hub is slopped compared to the old one.

" SLOPPED " :dontknow:...?????? Thanks .... Mike :thumbup:

 

[PW2013STL]

Thanks for the photos. Am I wrong, or is the new one larger?

Same size. The clean painted surface gives the illusion it's larger.

 

[Snoking1127]

Side by side pictures.
Holes are the same size. Looks like the flange to sprocket hub is slopped compared to the old one.

I assume that in the third picture the old one is turn 180 degrees? Are the splined hubs the same length or is the new one wider?

 

[PW2013STL]

" SLOPPED " :dontknow:...?????? Thanks .... Mike :thumbup:

One to many beers so I got 2 p's��