Noticed slightly more vibration today...

subxero · March 19th, 2013, 09:46 AM

So was riding to work and running late. Traffic was light and usually no 5-0 on main highways here so i was averaging around 80-85mph. About 1 mile from my exit just on a straight, i thought i noticed the vibration through the bars from the bike get slightly worse out of no where for no apparent reason. Nothing crazy, I immediately slowed down to speed limit, and debated pulling over, tryed to see if it was different pavement causing it and then Thinking well even if i pulled over i wouldnt be able to do much unless it was crazy obvious which i doubted and figured i'm close to work just take it easy get to work and take it from there.

So continued to work, no change in vibration from first change, i was trying to listen for abnormal sounds ect... but couldn't notice much. bike seemed to handle fine.

Got to work, but again was late, so did a quick looked and wiggled some things but could not see anything wrong with front end.

Will look at it better when i go to leave. Thinking it could be engine related? IDK, could be in my head?

Any thoughts? 2012 3600 miles, last oil change 300 miles ago everything looked good.

thanks in advance

Motofool · March 19th, 2013, 10:02 AM

I would check the tires first (pressure, foreign objects, cuts, etc.) and will lubricate the chain next.

Vibrations from chassis and final drive are related to bike's speed.

Vibrations from engine are related to rpm's.

Gear switching will determine what is what.

subxero · March 19th, 2013, 10:16 AM

Quote:

Originally Posted by Motofool

I would check the tires first (pressure, foreign objects, cuts, etc.) and will lubricate the chain next.

Vibrations from chassis and final drive are related to bike's speed.

Vibrations from engine are related to rpm's.

Gear switching will determine what is what.

Good thinking

thanks

subxero · March 19th, 2013, 04:45 PM

Rode home, thinking it is engine related as i notice it when rpm's are higher regardless of speed. Again it is a subtle vibration boarder line normal

not sure what to look at.

alex.s · March 19th, 2013, 04:55 PM

a bolt is probably loose or fell out

subxero · March 20th, 2013, 07:30 AM

didn't notice anything this morning on way to work.

So thinking it might have something to do with carbs/jetting air fuel ratio ect...

Yesterday started out a little chilly but was warming up quick on way to work + i had it running steady at 10.5k rpms for about 15 minutes straight before i noticed change in vibration. This morning was pretty chilly low 30's and the bike ran like it normally does. I have have been riding in cold temps pretty consistently and that is what i am used to so maybe change in temp caused something with carb ect... to change. IDK?

Time will tell as weather starts to warm up. I have all parts to do full exhaust mod, jetting ect... just need time to do it so with any luck this should be non issue soon.

DaBlue1 · March 20th, 2013, 09:45 AM

Altitude, air temperature, and humidity are big factors that will affect how an
engine will run. Air density increases as air gets colder. This means that there are more oxygen molecules in the same space when the air is cold. When
the temperature drops, the engine will run leaner (because of all those extra air molecules) and more fuel will have to be added to compensate. When the
air temperature gets warmer, the engine will run richer (because of less air molecules) and less fuel will be needed. An engine that is jetted at 32 degrees Fahrenheit may run poorly when the temperature reaches 90 Fahrenheit.

Some of those days you've had in the 50's and 60's, your bike would have run a little richer and the engine resonate differently as well. Believe it or not a bike will run better when it is a little leaner than normal (AFRs below 14.7:1)

March 19th, 2013, 09:46 AM	#1
subxero dirty boy Name: Joe Location: Johnstown, PA Join Date: Sep 2012 Motorcycle(s): I don't even know anymore?? Posts: A lot. MOTM - Apr '14	Noticed slightly more vibration today... So was riding to work and running late. Traffic was light and usually no 5-0 on main highways here so i was averaging around 80-85mph. About 1 mile from my exit just on a straight, i thought i noticed the vibration through the bars from the bike get slightly worse out of no where for no apparent reason. Nothing crazy, I immediately slowed down to speed limit, and debated pulling over, tryed to see if it was different pavement causing it and then Thinking well even if i pulled over i wouldnt be able to do much unless it was crazy obvious which i doubted and figured i'm close to work just take it easy get to work and take it from there. So continued to work, no change in vibration from first change, i was trying to listen for abnormal sounds ect... but couldn't notice much. bike seemed to handle fine. Got to work, but again was late, so did a quick looked and wiggled some things but could not see anything wrong with front end. Will look at it better when i go to leave. Thinking it could be engine related? IDK, could be in my head? Any thoughts? 2012 3600 miles, last oil change 300 miles ago everything looked good. thanks in advance

March 19th, 2013, 10:02 AM	#2
Motofool Daily Ninjette rider Name: Hernan Location: Florida Join Date: Mar 2011 Motorcycle(s): 2007 Ninja 250 Posts: A lot. MOTY - 2016, MOTM - Dec '12, Jan '14, Jan '15, May '16	I would check the tires first (pressure, foreign objects, cuts, etc.) and will lubricate the chain next. Vibrations from chassis and final drive are related to bike's speed. Vibrations from engine are related to rpm's. Gear switching will determine what is what. __________________________________________________ *Motofool* *.................................Never ride faster than your guardian angel can fly* "Mankind is composed of two sorts of men — those who love and create, and those who hate and destroy. Love is the bond between men, the way to teach and the center of the world." - José Martí

March 19th, 2013, 04:55 PM	#5
alex.s wat Name: wat Location: tustin/long beach Join Date: Sep 2009 Motorcycle(s): wat Posts: Too much. Blog Entries: 5 MOTM - Oct '12, Feb '14	a bolt is probably loose or fell out __________________________________________________

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March 19th, 2013, 04:45 PM	#4
subxero dirty boy Name: Joe Location: Johnstown, PA Join Date: Sep 2012 Motorcycle(s): I don't even know anymore?? Posts: A lot. MOTM - Apr '14	Rode home, thinking it is engine related as i notice it when rpm's are higher regardless of speed. Again it is a subtle vibration boarder line normal not sure what to look at.

March 20th, 2013, 07:30 AM	#6
subxero dirty boy Name: Joe Location: Johnstown, PA Join Date: Sep 2012 Motorcycle(s): I don't even know anymore?? Posts: A lot. MOTM - Apr '14	didn't notice anything this morning on way to work. So thinking it might have something to do with carbs/jetting air fuel ratio ect... Yesterday started out a little chilly but was warming up quick on way to work + i had it running steady at 10.5k rpms for about 15 minutes straight before i noticed change in vibration. This morning was pretty chilly low 30's and the bike ran like it normally does. I have have been riding in cold temps pretty consistently and that is what i am used to so maybe change in temp caused something with carb ect... to change. IDK? Time will tell as weather starts to warm up. I have all parts to do full exhaust mod, jetting ect... just need time to do it so with any luck this should be non issue soon.

March 20th, 2013, 09:45 AM	#7
DaBlue1 Long Time Rider Name: Blue Location: Charlotte, NC Join Date: Sep 2010 Motorcycle(s): 2009 Kawasaki Ninja 250R Posts: A lot.	Altitude, air temperature, and humidity are big factors that will affect how an engine will run. Air density increases as air gets colder. This means that there are more oxygen molecules in the same space when the air is cold. When the temperature drops, the engine will run leaner (because of all those extra air molecules) and more fuel will have to be added to compensate. When the air temperature gets warmer, the engine will run richer (because of less air molecules) and less fuel will be needed. An engine that is jetted at 32 degrees Fahrenheit may run poorly when the temperature reaches 90 Fahrenheit. Some of those days you've had in the 50's and 60's, your bike would have run a little richer and the engine resonate differently as well. Believe it or not a bike will run better when it is a little leaner than normal (AFRs below 14.7:1)