• Welcome to the Yamaha FZ1 Forums. Member registration disables ads and allows you to post and share. Register Here.

Curious observation...

H

Hack'dTiger

Member
Joined
Aug 6, 2009
Messages
41
Location
Oklahoma
Visit site
While sitting at a stoplight the other day, I noticed something odd. Clutch in (or out for that matter), in gear (or out, tried both ways for comparison), idling at around 1,200rpm (from what I've read this is normal), with what I would describe as normal engine 'vibration'. In other words it's not missing, stumbling, sporadic tach, etc...just a purr. Here's where it gets interesting...

When I grab the brake, there's an ever so slight change in vibration (more), but enough that can easily be seen in the mirrors. My guess is that it's the extra load to the charging system for the brake light, but I'm not familiar with the alternators on these things...yet.

It's not enough to be alarmed, like I said...just a curious observation. I'll be installing a Motodynamics integrated LED taillight in the next couple of days, and I'm interested to see if the more efficient lighting affects this any...if at all.

Then again, maybe I just pay too much attention to the little things?! ;)
 
No, you could be very right in your observation. At idle the alternator is not putting out a full charge so any extra electrical load is going to be noticeable. Full charge output is not accomplished until 5-5.5k RPM believe it or not. That's why idling the bike for long periods of time (especially if the fan comes on) could eventually drain the battery.
 
NJFZ1 said:
No, you could be very right in your observation. At idle the alternator is not putting out a full charge so any extra electrical load is going to be noticeable. Full charge output is not accomplished until 5-5.5k RPM believe it or not. That's why idling the bike for long periods of time (especially if the fan comes on) could eventually drain the battery.
Click to expand...

Dang, if you're right, you're a genious. I mean it makes perfect sense.
 
Post Motodynamic install...

Update...if anyone is curious the condition is still there, even after installing the new Motodynamic integrated LED taillight.

No worries though.:cheers:
 
Charging system draw could certainly be the cause. . . .You also might consider that when you grab the brake lever you are clamping the bike more rigidly to its resting spot. The front/back wheel have a certain mass and that becomes more directly connected to the rest of the bike when the pads are tight to the rotor(s). Miniscule forward / backward movements are reduced with the brakes applied as well. . . .
 
eurban said:
Charging system draw could certainly be the cause. . . .You also might consider that when you grab the brake lever you are clamping the bike more rigidly to its resting spot. The front/back wheel have a certain mass and that becomes more directly connected to the rest of the bike when the pads are tight to the rotor(s). Miniscule forward / backward movements are reduced with the brakes applied as well. . . .
Click to expand...

Interesting as have noticed the same vibration on my 2006 since new, when I apply the front brake. I assumed same as you described - a mechanical related transmission with front disk clamped. Hadn't occured to me it may be the increase load on the charging system so I will try and loading up with high beam or rear brake and see if issue still happens.

No one else has noticed this?
 
eurban said:
Charging system draw could certainly be the cause. . . .You also might consider that when you grab the brake lever you are clamping the bike more rigidly to its resting spot. The front/back wheel have a certain mass and that becomes more directly connected to the rest of the bike when the pads are tight to the rotor(s). Miniscule forward / backward movements are reduced with the brakes applied as well. . . .
Click to expand...

+1------ I'm withya man.
 
You must log in or register to reply here.
Back
Top