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Have you check carb 'balance' ? The air flow thro each should be the
same but if for some reason the throttle shafts have moved relative to each
other you can get miss firing. With throttle on rear SU not opening the sam=
e
as thbe front it will in effect be running lean.
Joe
>>=20
>> I believe it is a lack of fuel to the rear carb. The miss/backfire is a=
lways
>> from the rear carb and down stream in the exhaust pipe serving the rear
>> cylinders. I have used a Colortune to try and tune the carbs. It works=
fine
>> on the front carb but I can=B9t even get a yellow color or see anything in=
the
>> viewer except when it backfires. I haven=B9t found the fuel choke point. =
I=B9ve
>> taken the floats apart and found some crud and cleaned them out. I=B9ve
>> removed the jet from the rear carb and cleaned a very small amount of cr=
ud
>> from it=B9s base. I=B9ve set the float bowls at 5/16=B2 and the needles
>> work
>> fine. Fuel flows freely from the front carb. The only remaining point =
I can
>> think of is the passage between the float chamber and the jet. I intend=
to
>> take the carbs off again tomorrow and clean/clean/clean.
>>=20
>> Just so you know I have:
>>=20
>> 1. new points, condenser and rotor
>> 2. new ignition cap, wires caps and plugs
>> 3. drained the fuel tank and replaced with fresh fuel
>> 4. tried a different coil - no help
>> 5. set the timing
>> 6. set the tappets
>> 7. checked the needles - they are standard UH
>> 8. verified the needles are seated properly and fall freely
>> 9. removed fuel filter
>> 10. changed fuel lines with new
>> 11. did a compression test - 149, 142, 142, 138, 142, 139 psi front to b=
ack
>> 12. there is no oil in the coolant
>>=20
>> Thank you so much in advance for whatever light you can shed on this.
>>=20
>>=20
>> Price Lindsay
>> 67 BJ8
>>=20
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<html><head></head><body style=3D"word-wrap: break-word; -webkit-nbsp-mode: s=
pace; -webkit-line-break: after-white-space; font-size: 14px; font-family: C=
alibri, sans-serif; "><div style=3D"color: rgb(0, 0, 0); ">Have you check carb=
'balance' ? The air flow thro each should be the same but if =
for some reason the throttle shafts have moved relative to each other you ca=
n get miss firing. With throttle on rear SU not opening the same as thbe fro=
nt it will in effect be running lean.</div><div style=3D"color: rgb(0, 0, 0); =
"><br></div><div style=3D"color: rgb(0, 0, 0); ">Joe</div><div style=3D"color:
r=
gb(0, 0, 0); "><br></div><span id=3D"OLK_SRC_BODY_SECTION"><div style=3D"color:
=
rgb(0, 0, 0); "><div dir=3D"auto"><blockquote type=3D"cite"><div><div
class=3D"gma=
il_extra"><div class=3D"gmail_quote"><blockquote class=3D"gmail_quote"
style=3D"ma=
rgin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style=3D"wor=
d-wrap:break-word"><div><br></div><div>I believe it is a lack of fuel to the=
rear carb. The miss/backfire is always from the rear carb and down st=
ream in the exhaust pipe serving the rear cylinders. I have used a Col=
ortune to try and tune the carbs. It works fine on the front carb but =
I can’t even get a yellow color or see anything in the viewer except w=
hen it backfires. <b>I haven’t found the fuel choke point</b>.&n=
bsp; I’ve taken the floats apart and found some crud and cleaned them =
out. I’ve removed the jet from the rear carb and cleaned a very =
small amount of crud from it’s base. I’ve set the float bo=
wls at 5/16” and the needles work fine. Fuel flows freely =
from the front carb. The only remaining point I can think of is the pa=
ssage between the float chamber and the jet. I intend to take the carb=
s off again tomorrow and clean/clean/clean.<div><br></div><div>Just so you k=
now I have:</div><div><br></div><div>1. new points, condenser and rotor</div=
><div>2. new ignition cap, wires caps and plugs</div><div>3. drained the fue=
l tank and replaced with fresh fuel</div><div>4. tried a different coil - no=
help</div><div>5. set the timing</div><div>6. set the tappets</div><div>7. =
checked the needles - they are standard UH</div><div>8. verified the needles=
are seated properly and fall freely</div><div>9. removed fuel filter</div><=
div>10. changed fuel lines with new</div><div>11. did a compression test - 1=
49, 142, 142, 138, 142, 139 psi front to back</div><div>12. there is no oil =
in the coolant</div><div><br></div><div>Thank you so much in advance for wha=
tever light you can shed on this.</div><div><br><div><span style=3D"border-col=
lapse: separate; color: rgb(0, 0, 0); font-style: normal; font-variant: norm=
al; font-weight: normal; letter-spacing: normal; line-height: normal; text-a=
lign: -webkit-auto; text-indent: 0px; text-transform: none; white-space: nor=
mal; word-spacing: 0px; font-family: 'Times New Roman'; "><br>Price Lindsay<=
br>67 BJ8<br><br></span></div></div></div></div></blockquote></div></div></d=
iv></blockquote></div></div><font class=3D"Apple-style-span"
color=3D"#0000ee"><=
u><br></u></font></span></body></html>
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