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There is a manual for a Troy-Built 4-stroke backpack leaf blower here:
https://www.leafblowersdirect.com/manuals/TB4BPEC_manual.pdf
Around page 13 they detail idle speed adjustment, rocker clearance, etc..
Don't know if it your model, but might be a good place to start.
----------------
All the best,
Al Fuller
From: Shop-talk <shop-talk-bounces@autox.team.net> On Behalf Of Jim Franklin
Sent: Wednesday, August 5, 2020 5:29 PM
To: Shop-talk@autox.team.net
Subject: Re: [Shop-talk] M*th%&$#c<ing small engines d*mn again
If the valves have tighened up, which is normal as things wear, they won't
be sealing and you won't have enough compression to light off the charge, or
when it does light off it's leaking out instead of making power. Is there an
adjustment available on this engine? I don't know tiiny 4 strokes at all. I
would think they'd build it with more clearance than woul devery be used up
by wesr. Can you do a compression test on the cylinder? Leakdown test? Does
it feel easier to start (assuming a pull start) than when it was new? A
leaky valve would make it feel easier - the more leaky the easier it would
be.
You checked the spark plug wire for cracks? Can you try it in the dark and
see if the spark leaks out of the wire anywhere?
jim
On Aug 5, 2020, at 5:09 PM, Scott Hall <scott.hall.personal@gmail.com
The carb is getting fuel. I can see it in the fuel lines and it pumps using
the primer bulb.
The symptoms are identical with the old and new carb. I can't see the end of
the fuel line but the only remaining fuel issue could be that the new fuel
filter (a pumice stone-like thing on the end of the fuel line) could be
restrictive. Working against that theory is that it did the same thing with
the old fuel filter.
I don't think the problem is the fuel system. The problem is...what's left?
I swapped the spark plug just to do it.
It's a four-cycle engine. Might the valves (like the intake and exhaust
valves in the head) come out of adjustment? This condition has been
developing over more than a year...perhaps the valves are slowly coming out
of adjustment?
I don't know what conditions un-adjusted valves cause. I can't think of what
else it could be.
On Wed, Aug 5, 2020 at 3:23 PM <alfuller194@gmail.com
Can you confirm whether it is actually getting fuel to the carb? Try
starting it with ether/carb cleaner/gasoline directly to the carb?
----------------
All the best,
Al Fuller
From: Shop-talk <shop-talk-bounces@autox.team.net
Sent: Wednesday, August 5, 2020 4:06 PM
Subject: [Shop-talk] M*th%&$#c<ing small engines d*mn again
Troy Bilt four-stroke backpack leaf blower.
Replaced the carb and plug.
No change in symptoms: hard start, choke useless, engine bogs on application
of throttle.
That sounds like fuel/air to me. That's the carb. The carb and plug are
brand new. The old carb and plug look fine and it's doing the same thing.
The carb isn't the problem.
I am literally out of ideas. Any idea what to look at next before I just
toss it?
Thanks and (*&^*&%&#()_#@&*$&#^&^%.
Scott
_______________________________________________
Archive: http://www.team.net/pipermail/shop-talk
http://autox.team.net/archive
http://autox.team.net/mailman/options/shop-talk/jamesf@groupwbench.org
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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal>There is a =
manual for a Troy-Built 4-stroke backpack leaf blower here: <a =
href=3D"https://www.leafblowersdirect.com/manuals/TB4BPEC_manual.pdf";>htt=
ps://www.leafblowersdirect.com/manuals/TB4BPEC_manual.pdf</a><o:p></o:p><=
/p><p class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>Around =
page 13 they detail idle speed adjustment, rocker clearance, etc.… =
Don’t know if it your model, but might be a good place to =
start.<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><div><p =
class=3DMsoNormal>----------------<o:p></o:p></p><p =
class=3DMsoNormal>All the best,<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>Al =
Fuller<o:p></o:p></p></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b>From:</b> Shop-talk =
<shop-talk-bounces@autox.team.net> <b>On Behalf Of </b>Jim =
Franklin<br><b>Sent:</b> Wednesday, August 5, 2020 5:29 PM<br><b>To:</b> =
Shop-talk@autox.team.net<br><b>Subject:</b> Re: [Shop-talk] =
M*th%&$#c<ing small engines d*mn =
again<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>If the =
valves have tighened up, which is normal as things wear, they won't be =
sealing and you won't have enough compression to light off the charge, =
or when it does light off it's leaking out instead of making power. Is =
there an adjustment available on this engine? I don't know tiiny 4 =
strokes at all. I would think they'd build it with more clearance than =
woul devery be used up by wesr. Can you do a compression test on the =
cylinder? Leakdown test? Does it feel easier to start (assuming a pull =
start) than when it was new? A leaky valve would make it feel easier - =
the more leaky the easier it would be.<o:p></o:p></p><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal>You checked the spark plug wire for cracks? Can you =
try it in the dark and see if the spark leaks out of the wire =
anywhere?<o:p></o:p></p><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal>jim<o:p></o:p></p><div><p =
class=3DMsoNormal><br><br><o:p></o:p></p><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><p =
class=3DMsoNormal>On Aug 5, 2020, at 5:09 PM, Scott Hall <<a =
href=3D"mailto:scott.hall.personal@gmail.com";>scott.hall.personal@gmail.c=
om</a>> wrote:<o:p></o:p></p></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><p =
class=3DMsoNormal>The carb is getting fuel. I can see it in the fuel =
lines and it pumps using the primer bulb. <o:p></o:p></p><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal>The symptoms are identical with the old and new carb. =
I can't see the end of the fuel line but the only remaining fuel issue =
could be that the new fuel filter (a pumice stone-like thing on the end =
of the fuel line) could be restrictive. Working against that theory is =
that it did the same thing with the old fuel =
filter. <o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p class=3DMsoNormal>I =
don't think the problem is the fuel system. The problem is...what's =
left? I swapped the spark plug just to do =
it. <o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal>It's a four-cycle engine. Might the valves (like the =
intake and exhaust valves in the head) come out of adjustment? This =
condition has been developing over more than a year...perhaps the valves =
are slowly coming out of adjustment?<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p class=3DMsoNormal>I =
don't know what conditions un-adjusted valves cause. I can't think of =
what else it could be.<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><p class=3DMsoNormal>On =
Wed, Aug 5, 2020 at 3:23 PM <<a =
href=3D"mailto:alfuller194@gmail.com";>alfuller194@gmail.com</a>> =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in =
6.0pt;margin-left:4.8pt;margin-right:0in'><div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Can you =
confirm whether it is actually getting fuel to the carb? Try starting it =
with ether/carb cleaner/gasoline directly to the carb?<o:p></o:p></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p><=
/o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>------------=
----<o:p></o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>All the =
best,<o:p></o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p><=
/o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Al =
Fuller<o:p></o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p><=
/o:p></p><div style=3D'border:none;border-top:solid #E1E1E1 =
1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b>From:</b>=
Shop-talk <<a href=3D"mailto:shop-talk-bounces@autox.team.net"; =
target=3D"_blank">shop-talk-bounces@autox.team.net</a>> <b>On Behalf =
Of </b>Scott Hall<br><b>Sent:</b> Wednesday, August 5, 2020 4:06 =
PM<br><b>To:</b> <a href=3D"mailto:Shop-talk@autox.team.net"; =
target=3D"_blank">Shop-talk@autox.team.net</a><br><b>Subject:</b> =
[Shop-talk] M*th%&$#c<ing small engines d*mn =
again<o:p></o:p></p></div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p><=
/o:p></p><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Troy Bilt =
four-stroke backpack leaf blower.<o:p></o:p></p><div><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p><=
/o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Replaced =
the carb and plug.<o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p><=
/o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>No change =
in symptoms: hard start, choke useless, engine bogs on application of =
throttle.<o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p><=
/o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>That sounds =
like fuel/air to me. That's the carb. The carb and plug are brand new. =
The old carb and plug look fine and it's doing the same thing. The carb =
isn't the problem.<o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p><=
/o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>I am =
literally out of ideas. Any idea what to look at next before I just toss =
it?<o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p><=
/o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Thanks and =
(*&^*&%&#()_#@&*$&#^&^%.<o:p></o:p></p></div><div=
><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p><=
/o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Scott<o:p></=
o:p></p></div></div></div></div></blockquote></div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>__________________________________________=
_____<br><br><a =
href=3D"mailto:Shop-talk@autox.team.net";>Shop-talk@autox.team.net</a><br>=
href=3D"http://www.team.net/donate.html";>http://www.team.net/donate.html<=
/a><br>Suggested annual donation $12.96<br>Archive: <a =
href=3D"http://www.team.net/pipermail/shop-talk";>http://www.team.net/pipe=
rmail/shop-talk</a> <a =
href=3D"http://autox.team.net/archive";>http://autox.team.net/archive</a><=
br><br>Unsubscribe/Manage: <a =
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h.org">http://autox.team.net/mailman/options/shop-talk/jamesf@groupwbench=
.org</a><o:p></o:p></p></div></blockquote></div><p =
class=3DMsoNormal><o:p> </o:p></p></div></div></div></body></html>
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_______________________________________________
Shop-talk@autox.team.net
Archive: http://www.team.net/pipermail/shop-talk http://autox.team.net/archive
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