ArboristSite.com Sponsors
 
 



 
 


Results 1 to 11 of 11

Thread: Saw won't idle

  1. 12-29-2007, 03:27 PM #1
    Peacock
    Peacock is offline
    Arboristsite MVP
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Join Date
    Dec 2006
    Location
    Indiana
    Posts
    1,780
    Credits
    28

    Saw won't idle

    Ok, I've been intermittently fighting this problem for quite a while with my 280. Occasionally the saw would just die. Restart would be hard. I could rectify it with some light L jet opening. After doing this, the saw would have a slight hesitation coming off idle, especially when fully warmed up.

    Now, after I've ported the saw(it rips!!!) it is worse. I have the L jet 3 turns out and it will barely idle. Give it throttle and it dies instantly. I've tried everything I can think of. Took the carb apart and it was clean as could be, except for a very small piece of Dirko, presumably from initial assembly. Reassembled, same problem with no change.

    The saw, when off idle runs perfectly. Instant throttle response everywhere except idle.

    Seal leak?
    009L
    280
    441
    '95 2500 CTD
    Kubota MX5100
    Reply With Quote Reply With Quote
  2. 12-29-2007, 03:59 PM #2
    Scooterbum
    Scooterbum is offline
    Arboristsite MVP
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     Scooterbum's Avatar
    Join Date
    Oct 2006
    Location
    Virginia
    Posts
    4,509
    Credits
    723
    Your using Dirko when rebuilding your carb ?
    I did not send this from my Goofy Phone Thingie !!!



    Carburetor Adjustment On Pro Saws

    VACUUM TESTING


    It really sucks gettin' old and havin' ta' hang with the 30cc gang...............
    Reply With Quote Reply With Quote
  3. 12-29-2007, 04:23 PM #3
    Peacock
    Peacock is offline
    Arboristsite MVP
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Join Date
    Dec 2006
    Location
    Indiana
    Posts
    1,780
    Credits
    28
    Quote Originally Posted by Scooterbum View Post
    Your using Dirko when rebuilding your carb ?
    No. It was in the fuel inlet. No idea how it got there.
    009L
    280
    441
    '95 2500 CTD
    Kubota MX5100
    Reply With Quote Reply With Quote
  4. 12-29-2007, 04:27 PM #4
    huskydave
    huskydave is offline
    Arboristsite MVP
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     huskydave's Avatar
    Join Date
    Mar 2007
    Location
    Ontario Canada
    Posts
    1,452
    Credits
    72
    Did you turn up the idle speed screw? I would check out the impulse line for cracks. I would also check coil screws sometimes they vibrate loose and the coil will hit the flywheel at idle and kill the saw I have had that happen a few times loctite is the answer. Check fuel filter fuel lines and go from there. I would rebuild the carb and clean it very well there may be a piece of grit in there or a stiff diaphram.
    Last edited by huskydave; 12-29-2007 at 04:30 PM.
    Reply With Quote Reply With Quote
  5. 12-29-2007, 04:41 PM #5
    Peacock
    Peacock is offline
    Arboristsite MVP
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Join Date
    Dec 2006
    Location
    Indiana
    Posts
    1,780
    Credits
    28
    Quote Originally Posted by huskydave View Post
    Did you turn up the idle speed screw? I would check out the impulse line for cracks. I would also check coil screws sometimes they vibrate loose and the coil will hit the flywheel at idle and kill the saw I have had that happen a few times loctite is the answer. Check fuel filter fuel lines and go from there. I would rebuild the carb and clean it very well there may be a piece of grit in there or a stiff diaphram.
    The only way it will idle hot is with the idle screw in REAL far. Give it throttle and it dies instantly. The saw is WAAAYYYY too new to need a carb rebuild. I'd think. It starts and runs perfectly when cold, and when using choke. Plug was not wet when I just checked it and no fuel in crankcase.

    I just had the coil off, but set the gap per the manual.

    I did just find that I had an exhaust leak around the muffler gasket. Repaired that. Will retry in the morning.
    Last edited by Peacock; 12-29-2007 at 04:42 PM.
    009L
    280
    441
    '95 2500 CTD
    Kubota MX5100
    Reply With Quote Reply With Quote
  6. 12-29-2007, 04:42 PM #6
    Lakeside53
    Lakeside53 is offline
    Stihl Wrenching
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     Lakeside53's Avatar
    Join Date
    Dec 2004
    Location
    Woodinville, WA
    Posts
    24,831
    Credits
    103
    Pressure and vac test it... Sounds like you're compensating for a small air leak.
    Any sufficiently advanced technology is indistinguishable from magic."
    --Arthur C. Clarke,
    Reply With Quote Reply With Quote
  7. 12-29-2007, 04:44 PM #7
    Peacock
    Peacock is offline
    Arboristsite MVP
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Join Date
    Dec 2006
    Location
    Indiana
    Posts
    1,780
    Credits
    28
    Quote Originally Posted by Lakeside53 View Post
    Pressure and vac test it... Sounds like you're compensating for a small air leak.
    Ok, is it okay to use a 'smoke machine' to find the leak? We use them to leak check automotive EVAP systems. Basically no pressure and can find a leak down to .010"hg.
    009L
    280
    441
    '95 2500 CTD
    Kubota MX5100
    Reply With Quote Reply With Quote
  8. 12-29-2007, 05:01 PM #8
    Lakeside53
    Lakeside53 is offline
    Stihl Wrenching
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     Lakeside53's Avatar
    Join Date
    Dec 2004
    Location
    Woodinville, WA
    Posts
    24,831
    Credits
    103
    maybe, but if it's a seal it may only fail under vac.
    Last edited by Lakeside53; 12-29-2007 at 05:02 PM.
    Any sufficiently advanced technology is indistinguishable from magic."
    --Arthur C. Clarke,
    Reply With Quote Reply With Quote
  9. 12-29-2007, 05:04 PM #9
    Peacock
    Peacock is offline
    Arboristsite MVP
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Join Date
    Dec 2006
    Location
    Indiana
    Posts
    1,780
    Credits
    28
    Books shows .4 bar vacuum. How many inches is that?

    So, will that cause it die instantly when I open the throttle?
    009L
    280
    441
    '95 2500 CTD
    Kubota MX5100
    Reply With Quote Reply With Quote
  10. 12-29-2007, 05:13 PM #10
    Lakeside53
    Lakeside53 is offline
    Stihl Wrenching
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     Lakeside53's Avatar
    Join Date
    Dec 2004
    Location
    Woodinville, WA
    Posts
    24,831
    Credits
    103
    0.4x14.7=??? (at sea level)

    It's pulling marginal gas though the carb by the vac against the closed throttle plate. Open it and the carb runs out of gas.

    Are you sure you reconnectd the impulse line?
    Any sufficiently advanced technology is indistinguishable from magic."
    --Arthur C. Clarke,
    Reply With Quote Reply With Quote
  11. 12-29-2007, 05:15 PM #11
    Peacock
    Peacock is offline
    Arboristsite MVP
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Join Date
    Dec 2006
    Location
    Indiana
    Posts
    1,780
    Credits
    28
    Stupid math. I have all the info in my head, just no way to access it.

    I get what you're saying.

    Just checked the hose, pain to get to. Just runs to the carb gasket. Maybe 2" long.
    Last edited by Peacock; 12-29-2007 at 05:18 PM.
    009L
    280
    441
    '95 2500 CTD
    Kubota MX5100
    Reply With Quote Reply With Quote
« Previous Thread | Next Thread »

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules

Page generated in 0.28601 seconds with 43 queries [Server Loads: 3.55 3.07 : 2.70]