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rossco

FZ-07 Front Sprocket Nut size-answered

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rossco
Can anyone tell me the size of socket I need for the front sprocket? 
 
EDIT. YAMAHA FZ-07 FRONT SPROCKET NUT IS 30MM, REAR SPROCKET NUT IS 27 MM.

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Cruizin
Can anyone answer this please? If so, ill add it to our tech tip section @guru ?

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peteinpa
My standard socket collection has larger sizes than my metric. On the larger nuts (rear axle, countershaft,etc.) I'm always using standard. They fit tightly.
 
I don't remember what size though.

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rick
The parts list just calls it a nut, but this is the part number 90179–22018
 
[HASH]42 here http://www.partzilla.com/parts/search/Yamaha/Motorcycle/2015/FZ07%20-%20FZ07FCGY/TRANSMISSION/parts.html
 
It appears to be the same part on the FZ09 and a bunch of other Yamaha. Maybe a quick question to the FZ9 group will give socket size.
 
According to the service manual, this nut gets staked once torqued to 69 ft-lbs, so it should be replaced if yer changing sprockets. The washer behind that nut is a conical spring washer (sometimes called a Bellville washer) and has a marking on one side that reads "out" - kinda self-explained
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i28
Someone mentioned needing a 30mm socket once
https://fz07.org/thread/810/talk-chain-sprocket-upgrades?page=5
 
 
The fz-09 and fj-09 also seem to have a 30mm sprocket nut
 
Sources:
https://fj-09.org/thread/2166/front-sprocket-nut-size
 
http://www.fz09.org/forum#/topics/9252?page=1
 
 
My only question is why is the "drive sprocket nut" listed as a size m22 in the service manual? It's the only item torqued to 69ft lbs.
Isn't that the same part?

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rick
Someone mentioned needing a 30mm socket once https://fz07.org/thread/810/talk-chain-sprocket-upgrades?page=5
 
 
The fz-09 and fj-09 also seem to have a 30mm sprocket nut
 
Sources:
https://fj-09.org/thread/2166/front-sprocket-nut-size
 
http://www.fz09.org/forum#/topics/9252?page=1
 
 
My only question is why is the "drive sprocket nut" listed as a size m22 in the service manual? It's the only item torqued to 69ft lbs.
Isn't that the same part?
what page in the manual are you seeing the m22?  Looked again in mine and did not see this.  
My guess is that's the threaded inner diameter (threaded size of the output shaft) , which would make a 30mm socket a decent guess. 

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i28
what page in the manual are you seeing the m22?  Looked again in mine and did not see this.  
My guess is that's the threaded inner diameter (threaded size of the output shaft) , which would make a 30mm socket a decent guess. 
 
In the tightening torque sections, one or the last items is the "drive sprocket nut" (page 2-22 in my manual). Says the thread size is m22 - so your explanation makes sense.
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markstertt
The parts list just calls it a nut, but this is the part number 90179–22018  
[HASH]42 here http://www.partzilla.com/parts/search/Yamaha/Motorcycle/2015/FZ07%20-%20FZ07FCGY/TRANSMISSION/parts.html
 
It appears to be the same part on the FZ09 and a bunch of other Yamaha. Maybe a quick question to the FZ9 group will give socket size.
 
According to the service manual, this nut gets staked once torqued to 69 ft-lbs, so it should be replaced if yer changing sprockets. The washer behind that nut is a conical spring washer (sometimes called a Bellville washer) and has a marking on one side that reads "out" - kinda self-explained
I wish I could remember the nut size, sorry, but I'd like to add that the nut has a narrow staking flange around it's inner diameter and you can carefully pop the staked section out of the groove in the shaft without ruining the nut. When I retorqued my used nut, it actually lined up with a clean unused section of flange over the shaft groove and if it hadn't I believe there is another groove 180* around the shaft (I think). I didn't see any reason to wait for a new nut or spend the money...just me. 
 
yep, looks like 2 staking grooves
 
DSCN1241.jpg
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rick
The manual implies 2 tabs be staked at 180 degrees - the drawings points to both and say unstake and restate, but never actually says "one" or "both". Could read it either way. Sounds like the factory is only doing one.
 
as long as that flange is OK, I'd probably reuse as well. Can always use a drop of blue loctite in a pinch.
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hobbs
Can anyone tell me the size of socket I need for the front sprocket?
 
 
It's 30 mm.
 
And the rear is 27 mm, just for posterity.
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USMCFieldMP
It's 30 mm. 
And the rear is 27 mm, just for posterity.
 
Can confirm. Just changed sprockets and chain.
 
RXSwZJ1.jpg
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Cruizin
Thanks guys and gals! Moved to the "Tech Tips" section. Also put some SEO into this so it gets shared on Google search results for anyone who searches for this.
 
facebook group tech tips do not show up in google search results.
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