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General Category >> Rubber Side Down! >> Stalling at 70 (NO SPARK - RESOLVED)
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Message started by eanon on 06/03/09 at 17:18:42

Title: Stalling at 70 (NO SPARK - RESOLVED)
Post by eanon on 06/03/09 at 17:18:42

A couple of mornings ago she started to stutter on the way to work, so I figured low gas, threw on the reserve, and rode the rest of the way no problem. Got to work, checked tank, plenty of gas. Huh. Two days later (this morning), while doing 70 on the highway, mind you, she starts to stutter again. Only this time I notice my tach, which is hooked up to the coil, is jumping 1000 rpm's (4K-5K) right before she stutters. Running fine, tach jumps, bike stutters. Any idea what would make the tach misread and make her stutter like that? I don't like sudden deceleration while in the fast lane. :o

Title: Re: Stalling at 70
Post by serowbot on 06/03/09 at 17:28:24

Unplug and re-plug the connections to the kickstand and clutch lever safety cutouts. The contacts my be dirty. My clutch lever did that and caused a similar symptom...

Title: Re: Stalling at 70
Post by verslagen1 on 06/03/09 at 18:40:05

And it wouldn't hurt to check the vac line

Title: Re: Stalling at 70
Post by Stimpy on 06/03/09 at 19:44:50

yup, verslagen is right on
could be the vac line from your carb
(try running w/ur valve in PRI, not ON)

Could also be a lose cable (battery/spark plug)

Title: Re: Stalling at 70
Post by verslagen1 on 06/03/09 at 21:59:44

40444B4A4B250 wrote:

... Only this time I notice my tach, which is hooked up to the coil, is jumping 1000 rpm's (4K-5K) right before she stutters. Running fine, tach jumps, bike stutters. Any idea what would make the tach misread and make her stutter like that?

I beleave the coil generates just enough voltage to do the job.
If there is an issue with firing sparky off, it will cause noise.
This noise will throw off the accuracy of the tach.
Running out of gas is one way to cause an issue.

So check the vac line for cracks or just replace.
use clamps on the ends, tie wrap or hose clamps.
check for fuel in the line while you're at it.

Title: Re: Stalling at 70
Post by eanon on 06/04/09 at 15:10:05

Thanks guys. I'll check it out this weekend and post results!

Title: Re: Stalling at 70
Post by Reelthing on 06/04/09 at 15:34:52

Had an odd issue like this a little while after a tach install - I'll guess you used a twin tail blade connectors on the coil to splice in the tach wires - check those two blade connectors for a tight fit

Title: Re: Stalling at 70
Post by eanon on 07/02/09 at 19:20:26

I know I said I would reply within a couple days but I managed to sprain my ankle pretty bad that weekend, so I haven't had a chance to mess with her for a couple of weeks. Wasn't going to work, could barely get of the couch!

http://s170.photobucket.com/albums/u274/eanonhorton/?action=view&current=june10.jpg
http://s170.photobucket.com/albums/u274/eanonhorton/?action=view&current=june14.jpg

It felt a lot worse than it looks in the pics, I promise! :-[

Anyway, I got to working on her a couple of days ago, and now have new problems... joy

I moved the battery to the left saddle bag. Had to make new cables. No problem. Got her put back together and she started right up. Very nice! gonna go for a quick ride around the block! It's been weeks since i've gotten to ride....

(Forgot to mention the battery was sitting on the ground next to the bike during the test run) Put the battery in the saddle bag, go to start up bike, click, click, nothing. Hmmm.

I can see the decomp cable moving. I've checked all the connections, everything is tight and clean. (In the process of test fitting, I actually broke a the negative terminal on my battery, so.... )Brand new battery. Also got a new spark plug and vac line.

I'm in the process of walking through the clymer's, (Resistance of the electrical connector from the signal generator reads 225 ohms), but i killed the battery looking/testing for loose/dirty connections. So while it's charging, any body got any ideas?

(I know this has been covered before, but i searched for 30 minutes, then went page by page, till I hit page 45....
Plus, once I get her running, I can try to fix to stalling issue! ::))

Thanks in advance

Title: Re: Stalling at 70
Post by T Mack 1 on 07/03/09 at 08:32:51

My tach jumped a bit till found that the connection was loose. How did you connect the tach???

T Mack

Title: Re: Stalling at 70
Post by eanon on 07/03/09 at 10:08:17

to the coil. just checked, coil is good, decomp is good, signal generator is good. still, no spark, as far as i can tell. i tried testing it by touching the base of the plug to the cylinder wall then trying to start the engine, like clymers suggests, but no spark. i guess i'm on to the ignition unit. think i just saw a post about checking that out, which will be handy, since yeah, clymers says "take it to the stealership".

Title: Re: Stalling at 70
Post by eanon on 07/03/09 at 10:12:25

nope. that was a post about the voltage regulator. anybody know how to test the ignition unit?

Title: Re: Stalling at 70
Post by eanon on 07/03/09 at 11:29:25

turns out my hot wire going into the starter relay had come un-soldered. Can't remember who posted that they had the same problem when their starter relay wasn't hooked up correctly, but thanks. she's turning over now. still not starting, but turning over. she always hard to start after not being ridden for a while, so i'm gonna give her a few minutes, charge my battery some more, and try again. wish me luck!

Title: Re: Stalling at 70
Post by ineclipse on 07/03/09 at 16:09:11

Good luck! Know how it feels to waltz around knowing for certain I've got my problems straight, taking moments to relax and enjoy my brilliant mechanical mind... when I return to find only the opposite. You do sound like you found a major issue, however. Like I said, my wishes are with you, good luck!
-Luke.

Title: Re: Stalling at 70
Post by justin_o_guy2 on 07/04/09 at 08:27:07

Good find. Just close visual inspection?

Title: Re: Stalling at 70
Post by eanon on 07/04/09 at 08:40:57

yeah. just tracing wires, checking connections. still no spark though. I used AWG 8 to remake the battery cables. on further research, I find out awg 8 is only rated to 24 amps. Could that be my problem? What is the cranking amps needed to achieve spark?

Title: Re: Stalling at 70
Post by eanon on 07/04/09 at 08:50:06

vroom1776 : "I don't think starting would be an issue (I think the starter motor draws about 30 Amps)"

maybe that's my problem. as everything I can check with the multi meter seems to be ok, maybe I just need some bigger wire. It's worth a shot.

Title: Re: Stalling at 70 (NO SPARK - RESOLVED)
Post by eanon on 07/04/09 at 12:50:06

Turns out 8 gauge doesn't move enough amps to make a spark, but 6 gauge does! Just got back from a test ride, and everything is great! She runs like a champ. Thanks for all the help guys. Still haven't resolved the initial issue of cutting out, but now that she's back on the road, I can try and diagnose that as well. Thanks again. HAPPY 4TH O' JULY!!! ;D