High Quality Chainsaw Bars Husqvarna Toys

Help with K760 saw

Agrarian

Super OPE Member
Local time
6:00 AM
User ID
819
Joined
Feb 7, 2016
Messages
161
Reaction score
273
Location
New Hampshire
Country flag
Maybe 15psi or more. And as Duce said above, you should remove the muffler and take a peek at the piston and intake side of the cylinder from the exhaust port. There could be a good clue there.
 

jpcjguy

New OPE Member
Local time
6:00 AM
User ID
26272
Joined
Mar 7, 2023
Messages
23
Reaction score
1
Location
Richmond, VA
Country flag
The video in an earlier post is through the muffler port - can you all see that?
 

Al Smith

Here For The Long Haul!
Local time
6:00 AM
User ID
537
Joined
Jan 14, 2016
Messages
6,050
Reaction score
13,357
Location
North western Ohio
Country flag
Cut-off,stone saws ,demo saws or whatever you want to call them operate in a really bad environments .They have better air filters than say chainsaws but injest a lot of abrasive particles .As such worn piston rings are not to be surprised . Generally speaking piston rings are not that costly and relarively easy to install .Fact you could use higher quality after market rings such as Caber which would work if you could find them .
 

Duce

Here For The Long Haul!
Local time
6:00 AM
User ID
809
Joined
Feb 6, 2016
Messages
2,138
Reaction score
7,342
Location
Roscommon, MI
Country flag
I think you will find that is a Partner saw.
 

jpcjguy

New OPE Member
Local time
6:00 AM
User ID
26272
Joined
Mar 7, 2023
Messages
23
Reaction score
1
Location
Richmond, VA
Country flag
Cut-off,stone saws ,demo saws or whatever you want to call them operate in a really bad environments .They have better air filters than say chainsaws but injest a lot of abrasive particles .As such worn piston rings are not to be surprised . Generally speaking piston rings are not that costly and relarively easy to install .Fact you could use higher quality after market rings such as Caber which would work if you could find them .
So a set of rings like this? I heard Caber are good: https://www.ebay.com/itm/172891956792
 

jpcjguy

New OPE Member
Local time
6:00 AM
User ID
26272
Joined
Mar 7, 2023
Messages
23
Reaction score
1
Location
Richmond, VA
Country flag
Can someone tell me if they can see the video?? :D If anything to let me know the sharing worked?!?! (darn google photos!)
 

jpcjguy

New OPE Member
Local time
6:00 AM
User ID
26272
Joined
Mar 7, 2023
Messages
23
Reaction score
1
Location
Richmond, VA
Country flag

Attachments

  • cylinder.jpg
    cylinder.jpg
    94.1 KB · Views: 12
  • cylinder2.jpg
    cylinder2.jpg
    69.2 KB · Views: 12
  • cylinder3.jpg
    cylinder3.jpg
    84.2 KB · Views: 12
  • cylinder4.jpg
    cylinder4.jpg
    71.6 KB · Views: 12

jpcjguy

New OPE Member
Local time
6:00 AM
User ID
26272
Joined
Mar 7, 2023
Messages
23
Reaction score
1
Location
Richmond, VA
Country flag
more pics
 

Attachments

  • piston side.jpg
    piston side.jpg
    130.1 KB · Views: 12
  • piston side2.jpg
    piston side2.jpg
    136.3 KB · Views: 12
  • piston top.jpg
    piston top.jpg
    123.4 KB · Views: 12

Agrarian

Super OPE Member
Local time
6:00 AM
User ID
819
Joined
Feb 7, 2016
Messages
161
Reaction score
273
Location
New Hampshire
Country flag
That color change in the cylinder wall indicates the plating is worn through which is common on those saws. You should be able to feel a very slight ridge between the two colors (plating is only a couple of thousandths). If I'm right, it's not something that can be fixed - time for a new top end. That certainly would explain the low compression.
 

Duce

Here For The Long Haul!
Local time
6:00 AM
User ID
809
Joined
Feb 6, 2016
Messages
2,138
Reaction score
7,342
Location
Roscommon, MI
Country flag
Not a cheap oem repair. Also look a Partner 750/760 parts.
 

jpcjguy

New OPE Member
Local time
6:00 AM
User ID
26272
Joined
Mar 7, 2023
Messages
23
Reaction score
1
Location
Richmond, VA
Country flag
Thanks everyone for helping me. I do appreciate it. I was expecting a top end. But what do you all think about the connecting rod play? There is a lot of slop - or so I think….
 

Agrarian

Super OPE Member
Local time
6:00 AM
User ID
819
Joined
Feb 7, 2016
Messages
161
Reaction score
273
Location
New Hampshire
Country flag
The biggest concern with crank play is the radial type. Put the crank at the top of its stroke. Then see if there is any slop when you push and pull the conrod straight up and straight back. Hard to describe but easy to check. If there is any play, the crank is bad.
 

jpcjguy

New OPE Member
Local time
6:00 AM
User ID
26272
Joined
Mar 7, 2023
Messages
23
Reaction score
1
Location
Richmond, VA
Country flag
Here are 2 pics of the rod when I push it from one side to the other
 

Attachments

  • rod1.jpg
    rod1.jpg
    110.7 KB · Views: 7
  • rod2.jpg
    rod2.jpg
    155.3 KB · Views: 7

Agrarian

Super OPE Member
Local time
6:00 AM
User ID
819
Joined
Feb 7, 2016
Messages
161
Reaction score
273
Location
New Hampshire
Country flag
Sliding side to side is normal and actually necessary to allow for minor alignment variations with the piston and cylinder. And some rocking sided to side is normal. It's the up and down play that can't be tolerated.
 

Agrarian

Super OPE Member
Local time
6:00 AM
User ID
819
Joined
Feb 7, 2016
Messages
161
Reaction score
273
Location
New Hampshire
Country flag
Yes but I did hear a click in the video when you were doing the up/down test. Was that from something else? The twisty test you did shows that there is a fair amount of wear to the bearing but it would work if there was no up/down play. For the limited use that you mentioned you had for this saw, a piston/rings/cylinder/piston bearing replacement should get it working for your needs.
 
Last edited:
Top