What would cause a backfire so bad it damages your air filter housing? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 05-07-2012, 07:34 PM Thread Starter
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What would cause a backfire so bad it damages your air filter housing?

Hey All!

I recently picked up another Vulcan 750 mainly for parts.. But I decided.. "Hey, let me see if I can get it running".. Cleaned the tank, put new plugs on it.. changed the wires out with another set I had and put seafoam in the carbs overnight...

Tried to start it yesterday and it literally blew my air filter housing in half... It shot about 5 feet and was stopped by my trailer...

WTF?

Not trying to fix this bike.. Just want to know your thoughts?

Thanks
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Accomplishments;

Changed Final Drive Fluid
Iridium Plugs

NGK Spark Plug Wires
Bridgestone Spitfire Tires
Maintenance Free Battery
Lubed the Spline
Shaved and Coastered
Under Tank Air Filter
Re-Jetted
Vn900 Seat Mod w/ Honda 1100 Backrest
Rebuilt Petcock
Custom Mirrors
Custom SaddleBags
LED Taillight
Heads Up Voltage Monitor

Upcoming: Change front fork Seals & Oil, install highway pegs & floorboards
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post #2 of 8 (permalink) Old 05-07-2012, 07:43 PM
Crap, I WAS in 5th gear.
 
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Quote:
Originally Posted by MaDeInSin View Post
Hey All!

I recently picked up another Vulcan 750 mainly for parts.. But I decided.. "Hey, let me see if I can get it running".. Cleaned the tank, put new plugs on it.. changed the wires out with another set I had and put seafoam in the carbs overnight...

Tried to start it yesterday and it literally blew my air filter housing in half... It shot about 5 feet and was stopped by my trailer...

WTF?

Not trying to fix this bike.. Just want to know your thoughts?

Thanks
That must have been exciting! Causes of backfiring include:

1. Lean condition (carb problem or intake leak, vacuum hose missing)
2. Incorrect ignition timing (wires in the right place, etc.)
3. Valve timing (cam gear slipped a tooth)
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post #3 of 8 (permalink) Old 05-07-2012, 08:27 PM
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^+1 Also stuck or leaking intake valve too. The only way for it to backfire thru the carb is to have the intake valves open.

MCCT Mod
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Bought 09/10 12.2k miles - 04/12 33.4k miles
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post #4 of 8 (permalink) Old 05-07-2012, 09:37 PM
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Well, that will wake you up!!

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 8 (permalink) Old 05-07-2012, 09:45 PM
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Quote:
Originally Posted by MaDeInSin View Post
Hey All!

I recently picked up another Vulcan 750 mainly for parts.. But I decided.. "Hey, let me see if I can get it running".. Cleaned the tank, put new plugs on it.. changed the wires out with another set I had and put seafoam in the carbs overnight...

Tried to start it yesterday and it literally blew my air filter housing in half... It shot about 5 feet and was stopped by my trailer...

WTF?

Not trying to fix this bike.. Just want to know your thoughts?

Thanks
I sure hot you were not sitting on the bike at the time and possibly standing on the opposite side. I can almost hear the pop by looking at the picture.

and always remember, "Ride until you rot!"
**Really not sure if the Big "C" is back right now
but having to face the fact that this is a lifetime routine
going forward. Five operations done and it still continues.

Tom
Vulcan 2000
New ride: 2009 Victory Vision Arlen Ness Signature Series
4507 miles
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post #6 of 8 (permalink) Old 05-07-2012, 09:50 PM
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Quote:
Originally Posted by MaDeInSin View Post
Hey All!


Tried to start it yesterday and it literally blew my air filter housing in half... It shot about 5 feet and was stopped by my trailer...

WTF?
ROTFLMMFA! That happened to me as well except it was the whole cover. After cleaning the carbs and tank due to rust everything was fine.

1986 Black Kawasaki Vulcan VN750 "Black KAWK"
VN750 #9300 & VROC #33453

EMGO Handlebar, V&H Exhaust, Drop Shocks, Raised/Painted Fork, MeanStreak Seat, Tank Bib, ME880 Oversize Tires, Engine Guard, Custom Mirrors, Chris Products Turn Signals, Ear Shave, 150/42 Jets, PINGEL Fuel Valve, MCCT, Volt Meter, Shendegen R/R, AGM Battery, Coastered, .020 Coils, Relo Gauges & Headlamp, SilverStar Ultra, LED Flashing Brake Light, Center Stand Delete, WOLO Airhorn.
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post #7 of 8 (permalink) Old 05-07-2012, 10:17 PM Thread Starter
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Ahhhhhh thanks everyone for the feedback...

I will admit.. It def made my ass jump... I was standing on the same side as the "explosion" :-)..

I am going to pull the carbs tonight or tomorrow and get a looksee.. I think the rear carb is clogged up... When I went to drain the carbs nothing came out of that one...

Def an experience!

Have a Great [email protected]

Accomplishments;

Changed Final Drive Fluid
Iridium Plugs

NGK Spark Plug Wires
Bridgestone Spitfire Tires
Maintenance Free Battery
Lubed the Spline
Shaved and Coastered
Under Tank Air Filter
Re-Jetted
Vn900 Seat Mod w/ Honda 1100 Backrest
Rebuilt Petcock
Custom Mirrors
Custom SaddleBags
LED Taillight
Heads Up Voltage Monitor

Upcoming: Change front fork Seals & Oil, install highway pegs & floorboards
MaDeInSin is offline  
post #8 of 8 (permalink) Old 05-07-2012, 10:41 PM
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Don' t think dynamite is a good substitute for gas--(LOL)

04-3,200 miles bought July 2011 with 928 miles. Loaded with acessories to many to list here, see my albums for more details! I also make a custom tank bib specific for the 750 if anyone is interested, ck my albums for some pics.
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