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post #1 of 12 (permalink) Old 07-13-2010, 08:08 PM Thread Starter
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Carb tuning questions

A couple of questions about tuning the carbs.

How do I check whether the float levels are correct?

What size wrench is the synch screw?

What is a good baseline for the air/fuel mixture and how do I tell what adjustments to make with out a tuning plug?

I have a vn750A2 with straight pipes and eyelet baffles; Iridium plugs; K&N filters in the stock filter housing's; the stock jets; and I am at around 1200' elevation.

Thnak you for the help!
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post #2 of 12 (permalink) Old 07-14-2010, 05:33 PM
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Quote:
Originally Posted by cneher View Post
A couple of questions about tuning the carbs.

How do I check whether the float levels are correct?

What size wrench is the synch screw?

What is a good baseline for the air/fuel mixture and how do I tell what adjustments to make with out a tuning plug?

I have a vn750A2 with straight pipes and eyelet baffles; Iridium plugs; K&N filters in the stock filter housing's; the stock jets; and I am at around 1200' elevation.

Thnak you for the help!


Clymer's has a section on checking the float levels - see pp.268-9
The sync screw is VERY SMALL (how's that for accuracy?), but I think it's a 5mm OD. If you want to turn the screw while running the bike, get a carb sync tool (sometimes you can find them on eBay); if you want to turn off the bike, adjust, try again, you can just use a small flat screwdriver. Turn off the bike, open the throttle, make an adjustment, try it again.

A/F factory is 1 5/8 turns, which is a tad lean. Most folks are turning 2+ - your goal is to reduce the lean popping.

C
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post #3 of 12 (permalink) Old 07-14-2010, 06:23 PM
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if you are going to adjust it search you tube on homemade manometers (spellcheck). you can usually make one for less than 10 dollars. as far as the size it is a 7mm. it is easiest to use a 7mm ignition wrench as they have much smaller bodies than a normal wrench. I am at sea level ear shaved de-goated I am at 2-3/4 turns with a .042 pilot jet and a .150 main jet and 2 shims under the needle.


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post #4 of 12 (permalink) Old 07-14-2010, 07:40 PM Thread Starter
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Thanks guys!

I'll give it a shot tonight!
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post #5 of 12 (permalink) Old 07-14-2010, 10:22 PM
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Originally Posted by vulcanjoe View Post
if you are going to adjust it search you tube on homemade manometers (spellcheck). you can usually make one for less than 10 dollars. as far as the size it is a 7mm. it is easiest to use a 7mm ignition wrench as they have much smaller bodies than a normal wrench. I am at sea level ear shaved de-goated I am at 2-3/4 turns with a .042 pilot jet and a .150 main jet and 2 shims under the needle.
Actualy it is 0.42mm "#42" pilot and 1.50mm "#150" main.


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REBUILT ENGINE
CUSTOM PAINT
VANCE & HINES CRUZERS
EAR SHAVED AND RE-JETTED W/K&N'S
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VOLTMETER
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COASTERD
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LEATHER TOOL AND ROLL BAG
PICKUP COILS GAPPED AT .018"
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post #6 of 12 (permalink) Old 07-14-2010, 10:30 PM
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Quote:
Originally Posted by cneher View Post
A couple of questions about tuning the carbs.

How do I check whether the float levels are correct?

What size wrench is the synch screw?

What is a good baseline for the air/fuel mixture and how do I tell what adjustments to make with out a tuning plug?

I have a vn750A2 with straight pipes and eyelet baffles; Iridium plugs; K&N filters in the stock filter housing's; the stock jets; and I am at around 1200' elevation.

Thnak you for the help!
You need:

#40 Pilot Jets
#135 Main Jets
set pilot screws to 2.0-2.5 turn out from stop.


85 VN700 "Old Yella"

REBUILT ENGINE
CUSTOM PAINT
VANCE & HINES CRUZERS
EAR SHAVED AND RE-JETTED W/K&N'S
DUNLOP ELITE K591 FRONT & REAR
VOLTMETER
SYNTHETIC BRAKE FLUID
SYNTHETIC OIL & GEAR LUBE
PLEXISTAR 2 WINDSHIELD
SPLINES LUBED
ACCT'S GREASED W/TOC SPRINGS
COASTERD
LEATHER SADDLE BAGS
LEATHER TOOL AND ROLL BAG
PICKUP COILS GAPPED AT .018"
NGK CAP, WIRES, IRIDUMS
BARNETT FRICTION PLATES & SPRINGS
CUSTOM GRIPS, MIRRORS, LEVERS
ORIGINAL STATOR & R/R 14.5v
DEKA MF AGM ETX15L

Best Auto/Moto Insurance | Motorcycle Protection Today | FREE Trade-In Quote
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post #7 of 12 (permalink) Old 07-14-2010, 10:58 PM
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thanks for the correction glad you are back


34k so far
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Keep the shiny side up
coastered
de-goat and baffles removed
jetted 42-150 2 shims
Earshaved with unifilters
inside of tank coated
spline lube
long Beach Blue Pearl Paint 4/07
Shindengen FH012AA r/r
TPE stator
Exide sc30lfa Battery 28ah 445cca
Saddlemen saddlebags
2001 HD fatboy solo seat
Custom taillight & rear turn signals
Fergy's coil relay mod
Fiamm El-Grande high/low tone horns
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post #8 of 12 (permalink) Old 07-22-2010, 05:24 PM
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Hola amigos soy de costa rica quisiera saber como desmontar los carburadores de la vulcan vn 750 1994 y donde puedo encontrar el kit de reparacion completo
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post #9 of 12 (permalink) Old 11-08-2010, 02:54 AM
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Quote:
Originally Posted by PANDILLERO View Post
Hola amigos soy de costa rica quisiera saber como desmontar los carburadores de la vulcan vn 750 1994 y donde puedo encontrar el kit de reparacion completo
Hola PANDILLERO, yo tambien soy de Costa Rica pero no estoy seguro que muchos aca hablen espaņol. Vas a tener que escribir las preguntas en ingles para que le respondan mas rapido.

con respecto a desmontar los carburadores, yo lo acaba de hacer (el Sabado) tiene que quitar el tanque, levantar un poco el "airbox" (la caja negra que esta debajo del tanque, quitar todas las mangueras que estan pegadas al carburador junto con las gasas, y con mucha paciencia quitar los carburadores moviendolos y girandolos para que salgan.

tuanis.

Adrian Murillo C.
'92 Vulcan 750.
RR Relocated.

Heredia, Costa Rica.
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post #10 of 12 (permalink) Old 11-08-2010, 11:53 AM
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Quote:
Originally Posted by PANDILLERO View Post
Hola amigos soy de costa rica quisiera saber como desmontar los carburadores de la vulcan vn 750 1994 y donde puedo encontrar el kit de reparacion completo
Quote:
Originally Posted by Adrianmur View Post
Hola PANDILLERO, yo tambien soy de Costa Rica pero no estoy seguro que muchos aca hablen espaņol. Vas a tener que escribir las preguntas en ingles para que le respondan mas rapido.

con respecto a desmontar los carburadores, yo lo acaba de hacer (el Sabado) tiene que quitar el tanque, levantar un poco el "airbox" (la caja negra que esta debajo del tanque, quitar todas las mangueras que estan pegadas al carburador junto con las gasas, y con mucha paciencia quitar los carburadores moviendolos y girandolos para que salgan.

tuanis.
I just tried to use the toolbar translate icon for these two posts. It says it is translated, but I can`t find the English anywhere. Does the translate function work on individual posts on an Engish site, or does it only work on a foreign language website? I know it worked for me once, several months ago on a foreign language site.

Can someone provide a translation here?
I think Pandillero says something like "Hello, I`m from Costa Rica and I need a complete repair kit for my vulcan 750 carbs."
Am I close? <G>

I`m not even going to try on Adrianmur`s answer, lol.

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Last edited by OlHossCanada; 11-08-2010 at 12:03 PM.
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