Author Topic: 5100s air leak  (Read 493 times)

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Offline dolmar

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Re: 5100s air leak
« Reply #10 on: September 22, 2014, 08:02:02 pm »
what makes you guys think it might be a fuel problem it was running just fine as soon as I pulled it up to cut again I noticed it was starting to rev way up I shut it down and started to check things out it was fueled up with fresh gas I work on all of my stuff it sounded like it just got leaned out right now

Offline brokenbudget

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Re: 5100s air leak
« Reply #11 on: September 22, 2014, 08:25:38 pm »
if the little screen in the carb is getting blocked (either from a passing fuel filter or fuel gumming) it will act somewhat like an air leak.
best to check the easy and most obvious first.
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Online jmester

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Re: 5100s air leak
« Reply #12 on: September 23, 2014, 05:54:44 am »
saw run great last year but now I got a air leak somewhere any help would be great thanks.

This is where I was thinking maybe a fuel issue. Saw ran great last year but now I have an air leak. Witch I assumed that you have not run the saw since last year.
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Offline aclarke

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Re: 5100s air leak
« Reply #13 on: September 23, 2014, 12:25:25 pm »
Run away motor is gonna be lack of fuel or too much air.  If it has been running great and the issue is spontaneous I would look first at a torn fuel line, pulse line, intake boot.
 In my experience that particular carb in the 5100 runs really lean and any small amount of crap under the Welch plug or low speed metering circuit can compound that issue and burn up a motor quickly.  Check the basics, like the above items as well as loose cylinder bolts and make sure the piston isn't damaged from the lean out.  Granted, everything else checks out, I would suspect dirty low speed circuit on the carb or worst case crank seals...

Offline 660magnum

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Re: 5100s air leak
« Reply #14 on: September 23, 2014, 01:08:37 pm »
5100's were kind of known to get this way.
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Online jmester

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Re: 5100s air leak
« Reply #15 on: September 23, 2014, 04:21:39 pm »
Did you try and richen up the high speed?
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Offline woodplayer

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Re: 5100s air leak
« Reply #16 on: January 10, 2015, 11:46:55 am »
what makes you guys think it might be a fuel problem it was running just fine as soon as I pulled it up to cut again I noticed it was starting to rev way up I shut it down and started to check things out it was fueled up with fresh gas I work on all of my stuff it sounded like it just got leaned out right now

Mine would run well on an upcut but lean out when cutting normally.  I found that the fuel lines on the early models were a little soft and too long and would sometimes kink and restrict the fuel.

Here is a link to dating back a few years to someone else who had the same problem, as well on the 2nd page of the thread I had included a link to my original problem.
http://www.arboristsite.com/community/threads/my-dolmar-5100-wont-run.106668/page-2

I might have some photos kicking around if you need them.

Offline 7sleeper

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Re: 5100s air leak
« Reply #17 on: January 13, 2015, 03:38:06 am »
+1 and no decomp on a 5100
Here in europe they had the Makita 5001(I forgot what the exact Dolmar counterpart was) which came standard with a decomp. I know because I had one.

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Offline Nathaniel Vansickle

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Re: 5100s air leak
« Reply #18 on: January 14, 2015, 10:46:11 am »
i was doing a bit of research on the 5100-5105 and ran across this. So it is possible that you will see one with a decomp.
5105H and 6400H in stock

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Offline 660magnum

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Re: 5100s air leak
« Reply #19 on: January 14, 2015, 11:24:59 am »
My 5105 is the hardest to pull over saw I have.

However it fires if you can get it past Top dead center and has never back fired or kicked back.
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
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