04 zr 900 efi . Top end rebuild, ring end gap - ArcticChat.com - Arctic Cat Forum
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post #1 of 15 Old 05-23-2019, 01:24 PM Thread Starter
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04 zr 900 efi . Top end rebuild, ring end gap

Hi, quick question. On dual ring pistons should you gap your second ring gap a little bigger then the top one ? Like 12,000 top one , second ring 16,000 thanks


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post #2 of 15 Old 05-23-2019, 09:37 PM
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Nope. And keep them as close to “low side” of recommended specs as possible.

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post #3 of 15 Old 05-23-2019, 10:32 PM Thread Starter
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Ok thanks, have to quit reading so many post on google , by the time you get done reading 15 post by different people on how they set up the ring end gap , I think more then 3/4 of them are all wrong or don’t no what there talking about I am finding out. Makes me wonder if guys go on there and post anything just to play with peoples minds. Thanks again . Was just going to clean up the cylinders a little bit and throw some new rings in this spare 04 900 efi if I blow my 02 zr 800/900 next year , how does it look? mag back side of cylinder looks like something was going on but when you run your finger tips in there no groves or marks. Weird???


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post #4 of 15 Old 05-23-2019, 11:53 PM
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Cylinders look great. I would give them a hone and gap rings accordingly and run it. Rule of thumb is .004" x the cylinder diameter. So if the cylinder is 3" around x .004" that would equal .012" MINIMUM. I would in that case go .014" and call it good.



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post #5 of 15 Old 05-24-2019, 10:58 AM
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Originally Posted by CatFever900 View Post

1) I think more then 3/4 of them are all wrong or don’t no what there talking about I am finding out. Makes me wonder if guys go on there and post anything just to play with peoples minds.



2) Mag back side of cylinder looks like something was going on but when you run your finger tips in there no groves or marks. Weird???
1) IMHO, I feel that way sometimes too. With some peoples comments, it’s like trying to pick up a by its “clean end” 😏

2) Good question, could have been a few different things, really.

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Cylinders look great. I would give them a hone and gap rings accordingly and run it. Rule of thumb is .004" x the cylinder diameter. So if the cylinder is 3" around x .004" that would equal .012" MINIMUM. I would in that case go .014" and call it good.
I’m sure you just referred to 3” bore as a “grab it out of the air” comment/post.... (Didn’t you....??? 🤭 ) The 700 twins are 3.189” themselves....

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0637-185: '99 Sno-Pro APV (guide and button) update kit p/n...
0637-186: '99 Sno-Pro APV superseded valve inserts update kit p/n...
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http://www.randakksblog.com/more-on-...fear-the-corn/

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post #6 of 15 Old 05-24-2019, 11:16 AM
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Specs (OEM)

Pic to left is ring end gap recommendations, I’d go .013” on both rings.

Pic to right is piston skirt to cylinder wall, if nearing the .0041”, I’d at least look into a couple SPI piston assembly’s for it.
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Quote:
If it's cnote approved it will work good
Quote:
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That is freeking sick man........
Don
0637-185: '99 Sno-Pro APV (guide and button) update kit p/n...
0637-186: '99 Sno-Pro APV superseded valve inserts update kit p/n...
https://www.arcticchat.com/forum/z-z...tml?highlight=

http://www.randakksblog.com/more-on-...fear-the-corn/

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post #7 of 15 Old 05-24-2019, 11:22 AM Thread Starter
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Thanks , have to check my old post on what I set the rings on zr 900 I built this year but it sounds about right thanks for the info. Didn’t no on the efi motors if things where set up different on the ring end gap. And why would someone off set the ring gap on dual ring pistons ? Better compression? Less wear on rings .


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post #8 of 15 Old 05-24-2019, 11:42 AM
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[QUOTE=C-note;3671935]
I’m sure you just referred to 3” bore as a “grab it out of the air” comment/post.... (Didn’t you....??? 🤭 )


Yes, that's right.
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post #9 of 15 Old 05-24-2019, 11:51 AM
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Originally Posted by CatFever900 View Post
Thanks , have to check my old post on what I set the rings on zr 900 I built this year but it sounds about right thanks for the info. Didn’t no on the efi motors if things where set up different on the ring end gap. And why would someone off set the ring gap on dual ring pistons ? Better compression? Less wear on rings .


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How would offsetting (having different measurements) of ring gaps add compression? Keeping them (both, top and bottom) towards their lowest spec will accomplish this. 👍🏻

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That is freeking sick man........
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0637-185: '99 Sno-Pro APV (guide and button) update kit p/n...
0637-186: '99 Sno-Pro APV superseded valve inserts update kit p/n...
https://www.arcticchat.com/forum/z-z...tml?highlight=

http://www.randakksblog.com/more-on-...fear-the-corn/

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post #10 of 15 Old 05-24-2019, 12:22 PM Thread Starter
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Was just reading some guys where setting there top ring at 13 and the bottom at 15 and some at 12 top and 14 bottom. Didn’t no the reason behind it. I set mine at the same gap.


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