Author Topic: 707D compression/pressure  (Read 561 times)

0 Members and 11 Guests are viewing this topic.

Offline dynodave

  • 4 cube
  • **
  • Posts: 35
  • Karma: 3
  • Location: Hamilton MASS USA
    • AGTS

  • Total Badges: 18
    Badges: (View All)
    Level 4 Fifth year Anniversary Fourth year Anniversary Karma Good Third year Anniversary Second year Anniversary
707D compression/pressure
« on: April 03, 2014, 07:05:14 pm »
Any one know what is cranking pressure for these old saws? My 707D blew just shy of 145psi. It has a new piston and rings running in a scratched, but not severely scored cylinder. It has now run Idled and throttled up for a total of about 10 minutes.
I have to send off my dead new tinytach and hope to get a warranty replacement, so I can set up the governor to 6K. Then I can cut wood and get it tuned to break from 4 stroke into 2 stroke...yeah baby...
pix of the patient here...
http://atlanticgreen.com/images/707da1t.jpg
32 saws
ECHO-HOMELITE-HUSQVARNA-McCulloch-PIONEER-POULAN-STHIL

Share on Facebook Share on Twitter


Offline Eccentric

  • Moderator
  • Nitro Hotsaw
  • *******
  • Posts: 2117
  • Karma: 217
  • Magnesium and Iron.
  • Location: Northwestern Wyoming

  • Total Badges: 37
    Badges: (View All)
    Tenth year Anniversary Nineth year Anniversary Eighth year Anniversary Seventh year Anniversary Sixth year Anniversary Fifth year Anniversary
Re: 707D compression/pressure
« Reply #1 on: April 04, 2014, 06:00:34 pm »
The Homelite Service Manual tells us to refresh the engine when compression falls below 100 psi.  You're doing very well to have 145 psi with a scratched cylinder.

Offline dynodave

  • 4 cube
  • **
  • Posts: 35
  • Karma: 3
  • Location: Hamilton MASS USA
    • AGTS

  • Total Badges: 18
    Badges: (View All)
    Level 4 Fifth year Anniversary Fourth year Anniversary Karma Good Third year Anniversary Second year Anniversary
Re: 707D compression/pressure
« Reply #2 on: April 04, 2014, 08:15:01 pm »
Thanks Aaron
I got curious and tried a pressure test on my 7-19C (82cc) also, and got just shy of 165psi. Both saws were converted to new std (no skip) 404 chain. The 7-19C is a 20" hard nose bar and the 707D is a new 30"carlton bar.
I've got a 15' piece of red oak 28" at the big end for testing cookies. I need the 707 running and cutting good for a maple at another property that is much bigger.... ;D
32 saws
ECHO-HOMELITE-HUSQVARNA-McCulloch-PIONEER-POULAN-STHIL

 

Related Topics

  Subject / Started by Replies Last post
56 Replies
2921 Views
Last post December 27, 2013, 02:20:57 pm
by 1manband
Compression

Started by ed McCulloch

8 Replies
3411 Views
Last post February 07, 2012, 03:07:10 pm
by Al Smith
19 Replies
3289 Views
Last post January 08, 2014, 03:28:06 pm
by 660magnum
6 Replies
749 Views
Last post November 10, 2013, 07:13:26 am
by rayvil01
9 Replies
5091 Views
Last post March 28, 2016, 10:51:30 pm
by 3000 FPS
0 Replies
315 Views
Last post August 01, 2015, 11:58:43 am
by Cut4fun .
1 Replies
430 Views
Last post March 31, 2017, 12:17:09 pm
by fossil
4 Replies
877 Views
Last post June 09, 2020, 12:32:29 pm
by Cut4fun .
0 Replies
350 Views
Last post February 01, 2021, 09:27:40 am
by Cut4fun
2 Replies
396 Views
Last post May 03, 2022, 02:46:30 pm
by joe_indi