i got problems choking her!!!! - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 12 (permalink) Old 09-01-2012, 06:45 PM Thread Starter
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i got problems choking her!!!!

ok this is whats going on on the first start up of the day i have to either hold the throttle up to get her warmed up or put the choke on for about a minute

to me that seems about right but know i have noticed that on the first initial wake up when i choke her the back cylinder does not fire every time

but as soon as i turn the choke off it fires just fine

so i figure somehow the choke is cutting fuel to the rear carb

what could be causing this

bike info:
factory caps still on carbs just cleaned the jets two weeks ago
all emissions removed
ears on
stock jets
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post #2 of 12 (permalink) Old 09-01-2012, 06:52 PM
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Few things you could look into..


- Weak spark in rear cylinder, has a harder time with the low temperature a/f mixture

- Out of sync carbs, less likely but since you had the carbs off I assume this was done?

1986 Kawasaki Vulcan 750
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post #3 of 12 (permalink) Old 09-01-2012, 07:04 PM
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Quote:
Originally Posted by thtanner View Post
Few things you could look into..


- Weak spark in rear cylinder, has a harder time with the low temperature a/f mixture

- Out of sync carbs, less likely but since you had the carbs off I assume this was done?
can't sync the carbs with the fuel adjustment screws still capped.
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post #4 of 12 (permalink) Old 09-01-2012, 07:18 PM
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Originally Posted by slimvulcanrider View Post
can't sync the carbs with the fuel adjustment screws still capped.
Didn't notice that.

Definitely needs to take those off and make sure his idle A/F mixture is set properly. Could be rich on that cylinder.

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350
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post #5 of 12 (permalink) Old 09-01-2012, 07:36 PM Thread Starter
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not weak spark for sure i have three day old ngk iridiums and the relay mod im kicking 12.5 to the coils

forgot to mention if i throttle up to warm the engine instead of choking her the back side fires just fine
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post #6 of 12 (permalink) Old 09-01-2012, 07:45 PM
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Quote:
Originally Posted by new rider 9984 View Post
not weak spark for sure i have three day old ngk iridiums and the relay mod im kicking 12.5 to the coils

forgot to mention if i throttle up to warm the engine instead of choking her the back side fires just fine
See above.

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350
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post #7 of 12 (permalink) Old 09-01-2012, 08:06 PM Thread Starter
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meaning knock off the caps and check if the screws have moved?
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post #8 of 12 (permalink) Old 09-01-2012, 08:37 PM
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From what I have read... every time you break the carbs apart to clean them, you have to re-sync them.....

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post #9 of 12 (permalink) Old 09-01-2012, 09:50 PM
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Originally Posted by Chris32250 View Post
From what I have read... every time you break the carbs apart to clean them, you have to re-sync them.....
Absolutely.

The screws are not set properly from factory anyways, pretty much for any setup, so definitely may need to make adjustments there.

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350
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post #10 of 12 (permalink) Old 09-01-2012, 09:51 PM Thread Starter
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well aint that a biznitch but i didnt remove them from the float chamber i just sprayed two cans of carb clean in each chamber thru the fuel inlet and thru the jet holes while the jets were out

just took a ride to see if htere was any other symptoms i missed and there were but they may or may not be related i have alot of popping out of the right pipe on decel and idleing at a light i here a very faint pop on the right
i do have vance and hines pipes

Last edited by new rider 9984; 09-01-2012 at 09:53 PM.
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