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Enduro Engine 4 stroke (including EFI & Exhaust) 4 stroke engine, EFI, and exhaust discussion


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  #1  
Old 06-28-2014, 08:42 PM
Why Z? Why Z? is offline
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Join Date: May 2014
Posts: 54
Default Gunshot sound while starting

Hi,
I disconnected the blue/yellow wire as I was asking in a earlier post and left the black wire.

My main concern is upon startup, if I start with throttle closed, bike will randomly make a loud "GUNSHOT" noise when I hit the button. If I start with throttle at half-open or more, it roars to life first try.

Additionally, here is what I have noticed after disconnecting the blue/yellow wire :

Blue/yellow Disconnected :
-seems to run moderately better/less hot thru all RPMS .
-bike never backfires on decel.
-Harder starting (with throttle closed)
- (LOUD "gunshot" backfire sounds when trying to start (button)
- needs to start with throttle half open (starts 1st or 2nd time as long as I do that)

Before (With wires connected):
-seemed to run a bit hot/lean
-pipe would glow red at cruising speeds (cool outdoor temp) when throttle opened more
-started not super easily, but would start, w throttle closed. Sometimes had to kick the bike manually a couple times .


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  #2  
Old 06-29-2014, 07:08 PM
Why Z? Why Z? is offline
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Join Date: May 2014
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Default

Is this something to worry about or not?
Valves?
Is this popping on startup a sign I could be damaging something ?

Paranoid to ride ... :-(
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  #3  
Old 06-29-2014, 07:33 PM
wa_ndro wa_ndro is offline
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Join Date: Feb 2013
Posts: 144
Default

Quote:
Originally Posted by Why Z? View Post
Is this something to worry about or not?
Valves?
Is this popping on startup a sign I could be damaging something ?

Paranoid to ride ... :-(
its fine, just a bit of fuel backfiring in the exhaust. Ride it like you stole it!
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