Evaluate my pistons/rings/cylinders please

A

adamg

Free Member

Mar 14, 2011

510

124

43

Saskatoon, SK

• Nov 4, 2017

• #1

Hi all, looking for advice. This is my 2016 Axys RMK 163x3 800 with about 1400miles on it. The engine and exhaust has been left stock.

Please take a look at these photos looking into the exhaust ports and tell me if anything looks concerning. Anything that would justify doing a top end.

Also, if I were to do a top end, why are there different part numbers for the 2016 pistons and rings VS the 2018 pistons and rings? Which should I buy?

Link to photos (about 80MB)
https://drive.google.com/open?id=1cRv9u4V2Bdmw-md1yHGa77dYvBIgm2Xb

 

Last edited: Nov 4, 2017

snoballssnoglory

Well-known member

Lifetime Membership

Nov 20, 2008

322

132

43

51

• Nov 5, 2017

• #2

Guessing there are no replies b/c of the google link. I can’t see the pics in my phone.


Sent from my iPhone using Tapatalk

 

A

adamg

Free Member

Mar 14, 2011

510

124

43

Saskatoon, SK

• Nov 5, 2017

• #3

Fair enough. Does this work better?
PTO side:
https://imgur.com/a/9Ou47

mag side:
https://imgur.com/a/VgEYf

 

J

jhurkot

Well-known member

Nov 26, 2007

772

352

63

Revelstoke, BC

• Nov 6, 2017

• #4

adamg said:

Fair enough. Does this work better?
PTO side:
https://imgur.com/a/9Ou47

mag side:
https://imgur.com/a/VgEYf

Click to expand...

Was it down on compression?

 

Indy_500

Well-known member

Lifetime Membership

Jul 8, 2011

1,054

465

83

29

Greenville, WI

• Nov 6, 2017

• #5

Doesnt necessarily look bad, but i just peeked at my 16 with 1200 miles and it looks A LOT better than that.

 

S

sumtinwong

Free Member

Oct 4, 2016

695

209

43

north pole alaska

• Nov 6, 2017

• #6

if its not down on compression or performance I would leave it but you should look at the turbo form post New Top End in Turbod Axys - Which Pistons? indy dan gives a good discursion on when and what to look for FWIW he has ben building sleds for a lifetime....... or two

 

A

adamg

Free Member

Mar 14, 2011

510

124

43

Saskatoon, SK

• Nov 6, 2017

• #7

jhurkot said:

Was it down on compression?

Click to expand...

I'm having trouble finding a compression gauge I trust, but seems to be 125 psi both sides at 1800'ASL.

 

J

jhurkot

Well-known member

Nov 26, 2007

772

352

63

Revelstoke, BC

• Nov 7, 2017

• #8

125 is pretty good. Is the warranty finished?

While you’re there have a look at the reeds. I’ve had a petal go through the engine and trash a cylinder.


Sent from my iPhone using Tapatalk

 

diamonddave

Chilly’s Mentor

Lifetime Membership

Apr 5, 2006

5,577

3,890

113

Wokeville, WA.

• Nov 7, 2017

• #9

jhurkot said:

125 is pretty good. Is the warranty finished?

While you’re there have a look at the reeds. I’ve had a petal go through the engine and trash a cylinder.


Sent from my iPhone using Tapatalk

Click to expand...

Agree. The decision to go deeper is subjective to a lot of variables. How hard you ride, where you ride, chopper needed for breakdowns, time between rides if you do breakdown? Friendship loss for being the guy?

These motors are extremely hard on rings. The piston skirts still collapse on these pistons but PI finally found the right combination with the thickness.

Sometimes pulling the Y-pipe just leads to more questions. Looking at your pics, I don’t like the wear between the transfer ports. There is such a small surface area there that I have seen where that leads to more wear and cracks. Some engine builders will tell you not to worry about it after you’ve installed their pistons and find it in 300 miles. Not me. This is from the ends of the rings and locator pins chewing into the bore. Cleaning and polishing these ports is a must.

I rebuilt a ‘16 with about 600 miles last year that was low on RPM. I installed a MTNTK Fix Kit in it and R’s came right back and the guy had to jump up 2 more grams of weight.


You could probably run it but if it were mine, I’d be throwing a Fix Kit on it.

 

A

adamg

Free Member

Mar 14, 2011

510

124

43

Saskatoon, SK

• Nov 8, 2017

• #10

jhurkot said:

125 is pretty good. Is the warranty finished?

While you’re there have a look at the reeds. I’ve had a petal go through the engine and trash a cylinder.


Sent from my iPhone using Tapatalk

Click to expand...

Still on warranty.

 

J

jhurkot

Well-known member

Nov 26, 2007

772

352

63

Revelstoke, BC

• Nov 16, 2017

• #11

adamg said:

Still on warranty.

Click to expand...

throw her back together and pin it all day long.

 

A

adamg

Free Member

Mar 14, 2011

510

124

43

Saskatoon, SK

• Nov 18, 2017

• #12

jhurkot said:

throw her back together and pin it all day long.

Click to expand...

That's what I've been doing... or as long as my lack of fitness allows. I want more power though.

 

S

Snowbird11

Well-known member

Lifetime Membership

May 29, 2011

691

202

43

43

SLC/Samak, Ut

• Nov 18, 2017

• #13

adamg said:

That's what I've been doing... or as long as my lack of fitness allows. I want more power though.

Click to expand...

nothing a turbo won't cure.

 

A

adamg

Free Member

Mar 14, 2011

510

124

43

Saskatoon, SK

• Nov 19, 2017

• #14

Snowbird11 said:

nothing a turbo won't cure.

Click to expand...

I don't think a motor that is down 15hp NA would be worth turboing. I want to get this problem fixed before I spend that kind of money.

 

MKULTRA

Well-known member

Lifetime Membership

Dec 31, 2015

493

349

63

115

quebec, canada

• Nov 20, 2017

• #15

where that 15hp number is coming from?

if you lost 15hp you probably dont need other opinion if your need a rebuild, just do it