Author Topic: MS 460 No Start  (Read 540 times)

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Offline artsamm

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MS 460 No Start
« on: October 12, 2013, 09:14:06 am »
Good Morning, have a MS 460 that will not start. After about 20 minutes of use it stopped. Pulled oin cord and would not pull. First thought was. "This is not good"
Pulled recoil assembly off and it must have been bound up, crankshaft turned. Put it back together, and it would turn over but would not start. Does not even "hit" like it does right before you would drop it to 1/2 choke.
Did some further checks:
Plug: clean, and .020 gap (good according to spec)
air filter: clean (tried starting without air filter, no go)
Gas filter: clean
gas: Not old,  and do have a small odor of fuel when cranking over, does not seem enough of an odor to be flooded. Besides if flooding was an issue, should clear out over time.
ignition: has spark at plug when pulling cord with  switch on; none when switch off.
compression PSI: 75 psi at first pull, 100-110, after 4 consecutive pulls (appears OK, although not certain what spec is on a small 2 stroke). Used 2 different gages, same result.
Removed compression release to make sure that was not stuck open or damaged;  that looks OK.
Tried starting with compression release in both positions (pushed in, puled out), No go. Been trying to start saw on ground with foot on lower part of rear handle.
Any advice? Thanks alot everyone!

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Offline Cut4fun .

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Re: MS 460 No Start
« Reply #1 on: October 12, 2013, 09:28:14 am »
Pull muffler off and look at piston and rings.  PSI sounds like this.

 Check fuel line, fuel filter, impulse line, tank vent also while you are at it.  Good looking over basically.
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Offline artsamm

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Re: MS 460 No Start
« Reply #2 on: October 12, 2013, 09:42:21 am »
Not certain what the impulse line is. Tank vent, I believe that is top of tank near fuel cap? I work on trucks, not small 2 strokes (2 srtoke Detroit diesel, I know better) Thanks for the help.

Offline Cut4fun .

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Re: MS 460 No Start
« Reply #3 on: October 12, 2013, 09:46:38 am »
Pull the muffler off first for a look at the piston and rings first hand. 

Then I will post a pic of impulse later.  Going to a chainsaw gtg.   

Need to figure why it toasted topend if it is scored.
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Offline artsamm

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Re: MS 460 No Start
« Reply #4 on: October 12, 2013, 09:49:45 am »
Thanks alot!

Offline Cut4fun .

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Re: MS 460 No Start
« Reply #5 on: October 12, 2013, 09:50:19 am »
That was 2 easy.  Here is a 046 460 thread of rebuild I just did.

You can see impulse line between tank running to cylinder.  It is off in pic, not attached to cylinder in one I seen.  http://chainsawrepair.createaforum.com/stihl/stihl-046-460/
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Offline Adirondackstihl

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Re: MS 460 No Start
« Reply #6 on: October 14, 2013, 08:43:35 am »
Hmmm......nobody mentioned flywheel key  ;)

 

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