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Cometic Top End Gasket Set

Fits Your MachineDisplaying parts for your 2017 YAMAHA YZ85
Cometic Top End Gasket Set
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Cometic Top End Gasket Set

Fits: 2017 YAMAHA YZ85

Part# 1009120132 | Mfg Part# C7851

Our Price: $25.55

Get $1.28 in Quick Cash

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5+ In-Stock

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Additional Videos

Cometic Engine Performance

How To - Four-Stroke Top End Rebuild (Part 2)

How To - Rebuild Motorcycle or ATV Top End (Part 2)

How To - Hone A Cylinder

RM YouTube Channel
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Details

Special Notes:

  • *Kit includes:
    1-Inner Head O-Ring
    1-Outer Head O-Ring
    2-Exhuast O-Ring
    The Cometic Top End Gasket Kit comes with everything you need to properly complete a total top end rebuild of your engine. Cometic manufactures their gaskets to exceed OEM quality from chemical resistant, non-asbestos, flexible aramid fiber that is laminated on top of a stainless steel core. This makes for thick, exceedingly robust gaskets that won’t fold or tear during installation, giving your top end the tight seals it needs to keep running strong no matter the speed.

    Specs:
  • Complete top end gasket kits with head and base gaskets
  • Laminated aramid fiber construction
  • Gasket material is laminated on top of stainless steel cores
  • Aramid fiber contains no asbestos
  • Gaskets are flexible and won’t tear
  • Aramid fiber resists chemicals including fuel, coolant, and oils
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Cometic Top End Gasket Set Reviews

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WRITE A REVIEW
4.5 / 5.0
313 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
226
48
18
6
15
Value
4.5 / 5
Durability
4.6 / 5
Fitment
4.6 / 5
Performance
4.7 / 5
Recommend it?
Yes (52)
No (6)
Value
3 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
5 / 5
Perfect
Best gaskets in the industry

-m-2002 HONDA CR125R--
January 28, 2020
Williston, OH, US
Age: 25-44
Purchased
2 months ago
Gender:
Male
Weight:
191 - 220 lbs.
Height:
5'10 - 6'0
Value
5 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
A+
Everything was there that was needed. great value during my rebuild. thanks.
November 12, 2019
fairmont, WV, US
Purchased
6 months ago
Value
5 / 5
Durability
5 / 5
Fitment
1 / 5
Performance
5 / 5
Recommend it?
No
No good for 02 Honda CR125
All gaskets and o-rings are great except for the reed block gaskets which are not for this bike totally unusable. Shame because the others where a perfect fit.
October 3, 2019
Gosnells, WA, AU
Purchased
7 months ago
Value
4 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
4 / 5
Recommend it?
Yes
Quality Gaskets
I always have had good luck with these gaskets. They are also metal do no trying to get old gasket gunk off. Makes life easier and they are cheap, so definitely recommend them if you are considering these.

-m-DIRT BIKE--
September 25, 2019
Prescott, WI, US
Age: 15-24
Purchased
7 months ago
Gender:
Male
Weight:
131 - 160 lbs.
Height:
5'10 - 6'0
Value
5 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
Very comparable and affordable
Works as advertised thanks!

-m-2007 KAWASAKI KX100--
August 28, 2019
Abilene , TX, US
Age: 45-64
Purchased
8 months ago
Gender:
Male
Weight:
191 - 220 lbs.
Height:
5'10 - 6'0
Value
5 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
Works great
Everything came as expected. Used on a PW50. No issues so far. As always, fast shipping.

-m-1999 YAMAHA PW50 YZinger--
July 25, 2019
Amherst, OH, US
Age: 25-44
Purchased
9 months ago
Gender:
Female
Weight:
101 - 130 lbs.
Height:
5'7 - 5'9
Value
5 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
Good Kit
Cometic gaskets are great! EXCEPT for the valve seals.. they seem kind of cheap by design and don’t fit very tight versus the OEM ones.

Order OEM valve stem seals along with this gasket kit and you’ll be good ????
May 9, 2019
Lincoln, AL, US
Age: 25-44
Purchased
11 months ago
Value
5 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
perfect fit and seal great
Used these for the top end rebuild of a 1998 YZ 250 and everything fit great.

-m-1998 YAMAHA YZ250--
April 21, 2019
MINERAL CITY, OH, US
Age: 25-44
Purchased
1 year ago
Gender:
Male
Weight:
221 - 250 lbs.
Height:
5'10 - 6'0
Value
5 / 5
Durability
5 / 5
Fitment
5 / 5
Performance
5 / 5
Recommend it?
Yes
Fast and easy to order perfect fit for my bike
-m-2001 YAMAHA YZ250--
April 14, 2019
Fox Lake , IL, US
Age: 45-64
Purchased
1 year ago
Gender:
Male
Height:
5'4 - 5'6
Value
4 / 5
Durability
4 / 5
Fitment
5 / 5
Performance
4 / 5
Recommend it?
Yes
Very good gasket set.
This is a good, complete set for any top end.

-m-2013 KTM 350 SX-F--
March 28, 2019
Fillmore, UT, US
Age: 25-44
Purchased
over 3 years ago
Gender:
Male
Weight:
191 - 220 lbs.
Height:
6'1 - 6'3
Show more
Rocky Mountain ATV/MC gift card Each question or answer submitted enters you into a:
$100 gift card monthly drawing and a
$500 gift card quarterly drawing!
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 20 questions Browse 20 questions and 29 answers
What gaskets come with it for a 2001 400ex?
Logan H on Jan 18, 2017
Oil in radiator and crankcase. Head gasket look. Good.what. could. It be?
A shopper on Dec 11, 2016
BEST ANSWER: What vehicle is it for? It could possible be a water impeller seal or even a crank seal... not sure what vehicle you have?
Is this for the standard bore or big bore top end?
Justin T on Apr 3, 2018
BEST ANSWER: It is for standard bore cylinder.
I’m having trouble with my piston exceeding past the cylinder on stroke an slapping bottom of head. Are these gaskets thick enough to prevent that? Any help is appreciated. Thank you
Jeremy C on Nov 27, 2019
BEST ANSWER: Depending on what piston is used you may need a thicker base gasket or more than one to get the correct “X” clearance measurement between the top of the piston and the top of the cylinder wall to prevent the piston from contacting the cylinder head surface.
For KTM 2 stroke, does it include the copper washers for the cylinder head?
Adam P on Aug 9, 2018
BEST ANSWER: I,m not sure on the copper washers as it was almost a year ago.I do remember i bought some additional gaskets from a dealer (oem),because some were not correct. The cylinder base gasket must be measured and replace with the same thickness.That is critical and bought seperate for certain.
what size is the cylinder gasket?
Jeromy G on Mar 27, 2018
BEST ANSWER: The gasket is the same thickness of the OE, not any thicker or thinner.
Do the valve seals come in this kit for kfx450r?
Jason L on Apr 20, 2017
BEST ANSWER: Those are in the complete gasket set not a top end set
Does this come with the .3 and .5 mm base gasket. I'm reading it changes the port timing and is critical to maintain proper timing?
Adam W on Feb 7, 2020
BEST ANSWER: I installed the base gasket provided in the kit and it did not change the port timing. I did not measure the gasket before I installed it; the kit only had one base gasket included.
This product can be ship in to philippines?
BOB E on Jan 26, 2020
BEST ANSWER: Please email [email protected] with a list of part numbers you'd like to order and your full shipping address and they will be able to reply with a shipping quote for you.
Does it come with the gaskets for the power valve?
steven c on Jun 3, 2019
BEST ANSWER: Yes, this came with every gasket above the base gasket. Including power valve and exhaust
Valve seals included?
steven s on Apr 30, 2019
BEST ANSWER: Power valve seals are not included
They make a set for a 2018 ktm 300xc but not a 250xc I’m pretty sure they are the same?
Jake S on Jan 27, 2019
BEST ANSWER: I show this will fit 2017-2019 KTM 300 XC. I am sorry but I do not show this fitting the 2018 KTM 250XC model.

To see if this part will fit your machine please enter the make, model, and year into our "Choose a vehicle" drop down boxes found above the product image. If your machine is not listed, we may not carry the right item for your application. If you have a 2019 year model but don't see your machine as an option, please contact a tech via Live Chat or call us at 1-800-336-5437 for assistance.
Hi can I buy thicker base gaskets? For my lt250r
Gary C on Nov 29, 2018
BEST ANSWER: In this set we are unable to mix and match parts. However, I would be happy to check our inventory for a thicker base gasket. What year is your LT250R?
08 KTM 200 XCW - does this kit have all gaskets for power valve assembly, too? Intermediate flange, and what thickness base gasket?
Brian W on May 31, 2018
BEST ANSWER: Yes. This will come with all of the gaskets to replace the power valve cover gaskets as well.
Does this kit fit a 2017 husqvarna tc125?
DYLAN B on May 5, 2018
BEST ANSWER: Yes, you will just need to enter in your machine in the drop down boxes above the product image.
IS IT A 3 LAYER METAL HEAD GASKET?
JEREMY S on Jan 16, 2018
BEST ANSWER: What machine do you have?
So these gaskets will work with a 1988 xr200r?
A shopper on Oct 1, 2017
BEST ANSWER: Yes, this will fit your machine. If your machine is listed in the drop down menu above the product image then it will fit.
Does this Cometic top end gasket kit for a 2017 KTM sx 150 come with all the O-rings and gaskets for the power valve too? Or is just the cylinder base, head gaskets, O-rings and copper washers for the head bolts? The power valve has four O-rings and one large rectangular O-ring.. Thanks
doer on Sep 25, 2017
BEST ANSWER: This comes with everything you need including the power valve o-rings and gaskets.
What gaskets come in a 2015 crf250r kit? Thanks
Taite P on Nov 24, 2016
BEST ANSWER: Everything required to re do a top end.
What gaskets come in the kit for a 2003 ktm 125 sx?
Zach B on Aug 25, 2016
BEST ANSWER: Base Gasket, Cylinder Head O-Ring, Exhaust Flange Gasket, Reed Case Gasket, Side Cover Gaskets, Exhaust O-Rings.
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