Chain Saw Problem
Submitted: Monday, Sep 28, 2009 at 12:33
ThreadID:
72595
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3473
Replies:
14
FollowUps:
9
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Member - Roger B (VIC)
G'day All. Maybe one of you fine folk can throw some light on my chain saw (Talon) problem. Can't pull the starter rope. Motor is not seized and pull cord mechanism is fine. Remove the spark plug and it turns over as good as gold. It's got me buggered. Over to you lot. Cheers.
Roger B...........
Reply By: Member - Roger B (VIC) - Monday, Sep 28, 2009 at 17:31
Monday, Sep 28, 2009 at 17:31
Thanks everyone. I've removed the chain brake,and the problem still exists. The spark plug fitted, is the exact same one the saw was operating with until recently Plus, I put a rubber bung over the spark plug hole, and I still had the problem.That leaves the decompression device......all I have to do is find it, if one exists. It definately sounds like it might be the problem though. Thanks again everyone. I'll let you know the results. Cheers.
Roger B....
AnswerID:
384950
Reply By: Hairy (NT) - Monday, Sep 28, 2009 at 23:01
Monday, Sep 28, 2009 at 23:01
Gday Roger,
Buggered Spark Plug
Buggered Lead
Blocked filter
Old fuel
Not enough choke
Too Much choke
Crap in the fuel system ( carby etc )
Not pulling the cord hard enough
Not turned on
.................................
All of the above?????????????
Sorry mate.........But when cheap small engines dont work and you cant fix them yourself......throw them away...thats how they were designed .. and they will cost you more to send in for repair than they will to replce.
Good luck
Hairy
AnswerID:
385016
Reply By: mazcan barry - Tuesday, Sep 29, 2009 at 10:51
Tuesday, Sep 29, 2009 at 10:51
hi roger b
not sure whether i should stat another blog or add to this one as you may never see this now
after re -reading what you have done re talon chainsaw motor problem
i'm convinced the exhaust valve is carboned up to the point where the valve stem is jammed shut hence this is why you can get it to turn over with the spark plug out you proved and know it's not the plug but when replaced with a rubber plug in the plug hole it would;nt turn over
because simply the exhaust valve is not opening and when the plug is out it's using the plug hole as an alterative escape route i know the suggestion about a decompresion valve or lever does'nt apply to all single pot motors
they are only used in multi pot larger engines or older type diesels single pots that had very large flywheels on them and were hard to crank allowing one to wind it over then release the decompression lever in order for it to fire if you decompress a small single pot2 stroke motor such as a chain saw or simular while trying to start it,
it will never start in a million years simply because it's a single pot 2 stroke and needs compression to to make it fire also does'nt have a heavy flywheel to keep it rolling over between rope pulls
single pot engines have a habit of building up carbon on the ex valve stems and when you stop them hot the extreme heat from the motor has in the past burnt in the ex valve port/stem area and siezed many vlaves on chain saws /wipper snippers/ and briggs& stratton type motors they are notorious for it
think back to the last time your motor ran did you turn it off or did it stall stop either way the exhaust valve could till be jammed in the closed postion with carbon build up and it may have a broken a valve liffter and or camshaft on the exhause valve hoping htis trows a new light on the problem chers
mazcan barry
AnswerID:
385050
Follow Up By: mazcan barry - Tuesday, Sep 29, 2009 at 11:00
Tuesday, Sep 29, 2009 at 11:00
hi
roger b
correction to first sentence it should read ;;;;cant get it to turn over with the spark plug in
cheers mazcan barry
FollowupID:
652775
Follow Up By: dbish - Tuesday, Sep 29, 2009 at 13:11
Tuesday, Sep 29, 2009 at 13:11
Tallon chain saws are 2stroke. 2stroke motors dont have valves only inlet & ehaust ports inthe side of the barell which are un covered @ the botom stroke of the piston.
FollowupID:
652787
Follow Up By: Nargun51 - Tuesday, Sep 29, 2009 at 14:21
Tuesday, Sep 29, 2009 at 14:21
For the engine not to turn over there must be either one of two things stopping it; something stopping either the recoil starter from rotating (
check for loose screws or bolts) or the piston from moving up and down (such as a spark plug)
Flooding? By your description, I’d suggest that with the spark plug in the compression is too high; is the motor flooding or you’re leaving the choke out?
Another random thought…Did you run it without the correct mix one day… the conrod bearings could be knackered but will turn over without compression, but once this is applied the bearings collapse
The Talon saws are simplicity themselves; they can be taken apart with Allen Keys.
Spend a day getting your hands dirty and you might be able to fix it. They are so cheap it’s barely worth walking in the door of the mechanic…an hour’s work would be worth more than the cost of a replacement
FollowupID:
652793
Reply By:- Tuesday, Sep 29, 2009 at 22:36
Tuesday, Sep 29, 2009 at 22:36
G'day Roger B, I have a small Talon 2 stroke chainsaw and apart from replacing the2 spring loaded pivoting lugs in the recoil start mechanism, have found it to be robust and reliable. The parts were readily available and cost about $15.00. Your problem is perplexing, however I will put my money on the compresssion release mechanism and I would be surprised if it does not have one.Lawnmowers have them and they look like a mushroom screwed into the motor block. I suspect they house a spring loaded diaphragm which closes up once the motor starts. If you have a 4 stroke motor, the problem is most likely with the valves and in my opinion not worth repairing if the saw if getting short in the tooth, unless you are prepared to do a complete reconditioning. Regards Pauper.
AnswerID:
385135