Subject: Re: [Fot] Weber tuning help please

From: Bill Babcock via Fot <[email-masked]>
Date: Sun, 3 May 2015 09:21:09 -1000

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Sounds like an air leak somewhere. Perhaps it gets overcome at full =
throttle or is worsened at those specific RPMs because of harmonics in =
the vibration of the carb. Might be a crack or flaw in the carb, but =
more likely it=E2=80=99s in the mounting, either O rings or some other =
flaw. They can be hard to detect and locate. You could use the carb =
cleaner method=E2=80=94spray a little at each joint or suspect area and =
listen for changes in engine sound. I=E2=80=99ve used the ultrasonic =
detector I use for finding leaks in surfboards to some effect, a leak =
sounds like a calliope, but there=E2=80=99s a lot of other noise to sort =
it from.=20

> On May 3, 2015, at 8:40 AM, Jim Gray via Fot <[email-masked]> =
wrote:
>=20
> I just installed my webers and I=E2=80=99m running into something not =
covered in anything I=E2=80=99ve read so far.
> At cruise speed which I do on the street, 2500  -3000 RPM my exhaust =
gas temps on # 4  are 100 plus degrees
> over # 1and will climb to 1400 if I stay at that throttle setting. =
Under wide open throttle they equalize and seem
> to settle in at about 1300.
> However, I think this may be symptomatic of my other issue. When I=E2=80=
=99m tuning the idle air screws, open them up until
> it starts to miss & so on, I can get a predictable stumble from three =
out of the four screws.
> The screw on # 3 has no effect on the idle no matter how far I run it =
in or out.
> Also , when I put my syncrometers on #=E2=80=99s 3 and 4 they are =
significantly different.
> I=E2=80=99m not going to get my dyno tune before the first race in two =
weeks so I=E2=80=99m left to figure it out on my own for now.
> Any help would be greatly appreciated,
> Jim g
> =20
> _______________________________________________
>=20
> http://www.fot-racing.com <http://www.fot-racing.com/>
>=20
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Bill Babcock
[email-masked]
Editor: Ponostyle
Celebrating Water

Editor: Xtreme Geezer
Fitness and Fun After Forty
503.936.7660
http://www.PonoStyle.com
http://www.Xgeez.com

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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Sounds like an air leak somewhere. Perhaps it gets overcome =
at full throttle or is worsened at those specific RPMs because of =
harmonics in the vibration of the carb. Might be a crack or flaw in the =
carb, but more likely it=E2=80=99s in the mounting, either O rings or =
some other flaw. They can be hard to detect and locate. You could use =
the carb cleaner method=E2=80=94spray a little at each joint or suspect =
area and listen for changes in engine sound. I=E2=80=99ve used the =
ultrasonic detector I use for finding leaks in surfboards to some =
effect, a leak sounds like a calliope, but there=E2=80=99s a lot of =
other noise to sort it from.&nbsp;<div class=3D""><br =
class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D"">On =
May 3, 2015, at 8:40 AM, Jim Gray via Fot &lt;<a =
href=3D"mailto:[email-masked]" class=3D"">[email-masked]</a>&gt; =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"Section1" style=3D"page: Section1; font-family: Helvetica; =
font-size: 18px; font-style: normal; font-variant: normal; font-weight: =
normal; letter-spacing: normal; line-height: normal; orphans: auto; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: =
0px;"><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman';" class=3D""><font size=3D"2" =
face=3D"Arial" class=3D""><span style=3D"font-size: 10pt; font-family: =
Arial;" class=3D"">I just installed my webers and I=E2=80=99m running =
into something not covered in anything I=E2=80=99ve read so far.<o:p =
class=3D""></o:p></span></font></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman';" =
class=3D""><font size=3D"2" face=3D"Arial" class=3D""><span =
style=3D"font-size: 10pt; font-family: Arial;" class=3D"">At cruise =
speed which I do on the street, 2500&nbsp; -3000 RPM my exhaust gas =
temps on # 4 &nbsp;are 100 plus degrees<o:p =
class=3D""></o:p></span></font></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman';" =
class=3D""><font size=3D"2" face=3D"Arial" class=3D""><span =
style=3D"font-size: 10pt; font-family: Arial;" class=3D"">over # 1and =
will climb to 1400 if I stay at that throttle setting. Under wide open =
throttle they equalize and seem<o:p =
class=3D""></o:p></span></font></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman';" =
class=3D""><font size=3D"2" face=3D"Arial" class=3D""><span =
style=3D"font-size: 10pt; font-family: Arial;" class=3D"">to settle in =
at about 1300.<o:p class=3D""></o:p></span></font></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman';" class=3D""><font size=3D"2" face=3D"Arial" class=3D""><span =
style=3D"font-size: 10pt; font-family: Arial;" class=3D"">However, I =
think this may be symptomatic of my other issue. When I=E2=80=99m tuning =
the idle air screws, open them up until<o:p =
class=3D""></o:p></span></font></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman';" =
class=3D""><font size=3D"2" face=3D"Arial" class=3D""><span =
style=3D"font-size: 10pt; font-family: Arial;" class=3D"">it starts to =
miss &amp; so on, I can get a predictable stumble from three out of the =
four screws.<o:p class=3D""></o:p></span></font></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman';" class=3D""><font size=3D"2" face=3D"Arial" class=3D""><span =
style=3D"font-size: 10pt; font-family: Arial;" class=3D"">The screw on # =
3 has no effect on the idle no matter how far I run it in or out.<o:p =
class=3D""></o:p></span></font></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman';" =
class=3D""><font size=3D"2" face=3D"Arial" class=3D""><span =
style=3D"font-size: 10pt; font-family: Arial;" class=3D"">Also , when I =
put my syncrometers on #=E2=80=99s 3 and 4 they are significantly =
different.<o:p class=3D""></o:p></span></font></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman';" =
class=3D""><font size=3D"2" face=3D"Arial" class=3D""><span =
style=3D"font-size: 10pt; font-family: Arial;" class=3D"">I=E2=80=99m =
not going to get my dyno tune before the first race in two weeks so =
I=E2=80=99m left to figure it out on my own for now.<o:p =
class=3D""></o:p></span></font></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman';" =
class=3D""><font size=3D"2" face=3D"Arial" class=3D""><span =
style=3D"font-size: 10pt; font-family: Arial;" class=3D"">Any help would =
be greatly appreciated,<o:p class=3D""></o:p></span></font></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman';" class=3D""><font size=3D"2" face=3D"Arial" class=3D""><span =
style=3D"font-size: 10pt; font-family: Arial;" class=3D"">Jim g<o:p =
class=3D""></o:p></span></font></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman';" =
class=3D""><font size=3D"2" face=3D"Arial" class=3D""><span =
style=3D"font-size: 10pt; font-family: Arial;" =
class=3D"">&nbsp;</span></font></div><div style=3D"margin: 0in 0in =
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class=3D""><div class=3D""><font face=3D"Comic Sans MS" class=3D""><span =
style=3D"font-size: 14px; " class=3D"">Bill =
Babcock</span></font></div><div class=3D""><font face=3D"Comic Sans MS" =
class=3D""><span style=3D"font-size: 14px; " class=3D""><a =
href=3D"mailto:[email-masked]" =
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style=3D"font-weight: normal; font-style: normal; " class=3D""><font =
face=3D"Georgia" class=3D""><span style=3D"font-size: 14px; " =
class=3D"">Editor: Ponostyle</span></font></div><div class=3D""><font =
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_______________________________________________
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---

From: Bill Babcock via Fot <[email-masked]>
Date: Sun, 3 May 2015 11:53:22 -1000

--===============7194647677685925345==

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If you overtighten the rubber compression mounts they don=E2=80=99t =
work.=20

out of the four screws.
in or out.
significantly different.

Editor: Xtreme Geezer

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class=3D"">If you overtighten the rubber compression mounts they don=E2=80=
=99t work.&nbsp;<div class=3D""><br class=3D""><div><blockquote =
type=3D"cite" class=3D""><div class=3D"">On May 3, 2015, at 8:40 AM, Jim =
Gray via Fot &lt;<a href=3D"mailto:[email-masked]" =
class=3D"">[email-masked]</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div =

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