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10-04-2011, 04:40 PM
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#1 (permalink) |
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Junior Member
Join Date: Aug 2011
Location: Houston, TX
Posts: 28
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Sound changed?
The bike doesn't seem to behave any differently that I can tell, but I recently left my key in the ignition and on for about 15 minutes by mistake, had to get the bike towed, then hooked up a trickle charger for a few hours and everything was fine (battery still had juice, just not enough to turn the starter.)
I ran it for a few rounds around the block revving and keeping the RPM's on the high side of things for a while after that, however, now the sound coming out of the exhaust is consistently quieter (like actually muffled,) as of my last startup. I have had this happen on the freeway at high rpm's, just never immediately after a cold start. Basically, should I be concerned? And more hopefully, does anyone know why/how this might have happened? I liked the louder noise, made me more visible. Thanks in advance! (And yes, I know I was dumb to have left the key in the ignition, no need to rub it in.) |
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10-05-2011, 11:43 AM
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#2 (permalink) |
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Senior Member
Join Date: Nov 2008
Location: Visalia, CA
Posts: 4,463
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Since you don't say what kind of bike, I'll assume its a Shadow.. Are BOTH cylinders firing?
__________________
93 VT1100C Harley Killer (1150cc), VH Exhaust, 2mm sleeved and bored, Modified Heads and Valves, Adjustable Timing, Touring Seat, Baby Apes, Metzlers   
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10-05-2011, 11:46 AM
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#3 (permalink) |
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Junior Member
Join Date: Aug 2011
Location: Houston, TX
Posts: 28
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Sorry, Honda Shadow Spirit 750C2, I would assume both cylinders are firing as I didn't experience any power loss and didn't hear any pinging or other noise that would lead me to believe that one had stopped firing consistently.
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10-05-2011, 12:02 PM
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#4 (permalink) |
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Senior Member
Join Date: Nov 2008
Location: Visalia, CA
Posts: 4,463
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NEVER assume.... Could be weak inconsistant spark. Due to Weak battery. The sound change will either be a dead cylinder, spark or fuel. Could be broken exhaust, but not likely.
__________________
93 VT1100C Harley Killer (1150cc), VH Exhaust, 2mm sleeved and bored, Modified Heads and Valves, Adjustable Timing, Touring Seat, Baby Apes, Metzlers
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10-05-2011, 12:09 PM
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#6 (permalink) |
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Senior Member
Join Date: Nov 2008
Location: Visalia, CA
Posts: 4,463
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First action should be to determine if BOTH cylinders and all plugs are firing and not fouled.
Second action should be to have the battery load tested.
__________________
93 VT1100C Harley Killer (1150cc), VH Exhaust, 2mm sleeved and bored, Modified Heads and Valves, Adjustable Timing, Touring Seat, Baby Apes, Metzlers
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10-05-2011, 12:15 PM
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#7 (permalink) |
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Junior Member
Join Date: Aug 2011
Location: Houston, TX
Posts: 28
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Forgive my ignorance, being new to motorcycles and not having a whole lot of experience in mechanics, but how would I go about ensuring that both cylinders are firing? (Any specific tools I should have to do so?) I'm all about learning, especially on the fly, it's essentially what I do for work.
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10-05-2011, 12:22 PM
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#8 (permalink) |
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Senior Member
Join Date: Nov 2008
Location: Visalia, CA
Posts: 4,463
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Easyway is to start the bike. Then dissconect 1 plug at a time. What happens?
__________________
93 VT1100C Harley Killer (1150cc), VH Exhaust, 2mm sleeved and bored, Modified Heads and Valves, Adjustable Timing, Touring Seat, Baby Apes, Metzlers
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10-05-2011, 02:07 PM
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#10 (permalink) |
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Senior Member
Join Date: Sep 2011
Location: Tredegar,South Wales, near England, not far from Scotland.
Posts: 3,480
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Easier way is to start the bike and feel the pipes..if one is cold ....
John.
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Beauty is only skin deep but ugly goes right to the bone. |
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