Engine won't rev above 4K after carb clean - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 5 (permalink) Old 09-02-2015, 11:41 AM Thread Starter
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Engine won't rev above 4K after carb clean

My bike was running fine, but backfiring a lot while decelerating. Seemed like at times it was not idling quite right.

I pulled the carb and cleaned it out. I replaced the diaphragms with the JB industries one. I put it all back together and it started up and ran great. I jumped on the bike and rode 10 miles down the road at 60 mph. When I got to the next town I slowed down and the bike started to cough and sputter. It still idles great, better than it did before, but if I open the throttle it won't rev above 4K and it start to cough, pop and backfire. I thought I might have gotten water in the gas while the tank was off so I drained the tank and filled it with fresh gas. Still having the same issue. Any ideas as to what could cause this?

I really don't want to pull the carb again. Doing it once was a bear. I would hate to do it again. Not to mention finding time to do it between work and grad school classes and homework is very difficult! I wanted to be riding my bike to campus today! GRRR!
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post #2 of 5 (permalink) Old 09-02-2015, 11:53 AM
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How clean is the inside of your tank? Any possibility of crud finding its way in the carbs, even right after cleaning?

There is the blowback method to help blow crud out of the carbs w/o having to take them off.

Maybe a float issue? Some of the other guys will chime in with some other ideas im sure.

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 #3 of 5 (permalink) Old 09-02-2015, 12:07 PM Thread Starter
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I'm sure there could be a little bit of crud in the tank, but nothing that the filter shouldn't be able to handle. Certainly not enough to plug it immediately like that.

I'm not familiar with the blowback procedure, can you describe it?

I could believe there may be a float issue, but if so that would mean pulling the carbs again, correct?
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post #4 of 5 (permalink) Old 09-02-2015, 01:15 PM Thread Starter
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I FIGURED IT OUT!! HOORAY!

I had a pinched carb vent hose. I blew/sucked on it momentarily and all of a sudden the bike came to life again!

Thanks for your help!
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post #5 of 5 (permalink) Old 09-02-2015, 01:44 PM
1986 VN750
 
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I love when it's the simple stuff!

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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