Strange tach and throttle issue

g3ck0 · July 21st, 2016, 04:06 PM

Hi guys, I had a strange issue during my commute today. I've been riding regularly 3-4 times a week for the past couple months and never had an issue until now.

I was sitting at a red light with the clutch in when I noticed that the needle was all the way past the '15' mark just resting there. It was weird. The engine was idling. When the light turned green, the bike was unresponsive to throttle. I seemed to notice that the needle was then seen bouncing back and fourth until my bike died, as if I had stalled it. It tried to restart it a couple times and it finally came back. I put the choke back on for a bit and then I rode it without issues.

I verified that I had gas in the bike. I haven't washed the bike recently.

Is there any cause for this? I don't want this to happen as the bike kinda suddenly died at a red light.

csmith12 · July 21st, 2016, 04:09 PM

Check your battery terminals for cleanliness and ensure they are tight.

jkv45 · July 22nd, 2016, 06:55 AM

I would say look at the battery also. Do check the terminals, but i would also check voltage.

Check it before you start it (should be 12.7V or more), then check it while you are cranking (should be 10V or more), then check it when it's running about 3000 RPMs (should be over 13V).

A bad battery, or loose connections, will do what you described.

g3ck0 · July 22nd, 2016, 11:52 AM

Thanks. I'll go check the battery voltages. Should I wait for the engine to warm up before revving it up to 3k rpm?

jkv45 · July 22nd, 2016, 11:57 AM

Quote:

Originally Posted by g3ck0

Thanks. I'll go check the battery voltages. Should I wait for the engine to warm up before revving it up to 3k rpm?

Give it a minute or so of run time, but no need for it to be up to operating temp to rev to 3000.

juliusmichaelhonrada · July 23rd, 2016, 05:53 AM

this happened to my grandfather's bike when a wire in the ignition switch got exposed and hits a chassis ground , the gauge is still alive but erratic , and the bike will stall when on low rpm

Ghostt · July 23rd, 2016, 08:20 AM

Don't forget to check the grounds as well.

July 21st, 2016, 04:06 PM	#1
g3ck0 ninjette.org newbie Name: A Location: Bay Area, CA Join Date: Oct 2013 Motorcycle(s): Ninja 250R Posts: 6	Strange tach and throttle issue Hi guys, I had a strange issue during my commute today. I've been riding regularly 3-4 times a week for the past couple months and never had an issue until now. I was sitting at a red light with the clutch in when I noticed that the needle was all the way past the '15' mark just resting there. It was weird. The engine was idling. When the light turned green, the bike was unresponsive to throttle. I seemed to notice that the needle was then seen bouncing back and fourth until my bike died, as if I had stalled it. It tried to restart it a couple times and it finally came back. I put the choke back on for a bit and then I rode it without issues. I verified that I had gas in the bike. I haven't washed the bike recently. Is there any cause for this? I don't want this to happen as the bike kinda suddenly died at a red light.

July 21st, 2016, 04:09 PM	#2
csmith12 The Corner Whisperer Name: Chris (aka Reactor) Location: Northern KY Join Date: May 2011 Motorcycle(s): 2010 250 (track), 1992 250, 2006 R6 (street/track), 2008 R6 (track) Posts: Too much. MOTY 2015, MOTM - Nov '12, Nov '13	Check your battery terminals for cleanliness and ensure they are tight. __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School
	1 out of 1 members found this post helpful.

July 23rd, 2016, 08:20 AM	#7
Ghostt in your machine Name: Scott Location: Summer Shade, Ky. Join Date: Oct 2014 Motorcycle(s): 98 Ninja 250/F12 aka ZX-2R "SERENITY", 91 Ninja 500/A5 aka ZX-5R "Phoenix", 84 Honda GL1200A "SIREN" Posts: A lot. Blog Entries: 25 MOTM - Jun '17, May '16, Mar '15	Don't forget to check the grounds as well. __________________________________________________ *violente et ignorantia* ZX-2R BLOG *Twitter and Instagram = Ghostt_Scott* *I'm not here to change your mind, just to inform.*

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July 22nd, 2016, 06:55 AM	#3
jkv45 Rev Limiter Name: Jay Location: WI Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot. MOTM - Jun '18, Oct '16	I would say look at the battery also. Do check the terminals, but i would also check voltage. Check it before you start it (should be 12.7V or more), then check it while you are cranking (should be 10V or more), then check it when it's running about 3000 RPMs (should be over 13V). A bad battery, or loose connections, will do what you described.

July 22nd, 2016, 11:52 AM	#4
g3ck0 ninjette.org newbie Name: A Location: Bay Area, CA Join Date: Oct 2013 Motorcycle(s): Ninja 250R Posts: 6	Thanks. I'll go check the battery voltages. Should I wait for the engine to warm up before revving it up to 3k rpm?

July 23rd, 2016, 05:53 AM	#6
juliusmichaelhonrada ninjette.org guru Name: Julius Michael Location: Philippines Join Date: May 2016 Motorcycle(s): GPX250-RII Posts: 296	this happened to my grandfather's bike when a wire in the ignition switch got exposed and hits a chassis ground , the gauge is still alive but erratic , and the bike will stall when on low rpm