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Old 07-17-2013, 03:59 PM   #78796
Adv Grifter
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Location: Passing ADV Stalkers in California
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Given that the cut out occurs at a more predictable point ... I'm guessing it's not the side stand switch (but of course it could be ), certainly worth checking.

IMO, the problem is definitely electrical/spark related.
Start with the simple things:
Check Kill switch for grounding
Ignition key switch issue?
Check for shorting or broken wire (like in the stand switch and clutch disable area)
Replace the Spark plug wires and caps (unlikely as DR will run on just one)
Check out the coil (very rare to fail on the DR ... never heard of a failure)
God Forbid ... ECM. Best way to check is to replace with a "known good" ECM unit and pray that is not it. Expensive.

I'm not certain if an intermittent Regulator/Rectifier could cause that sort of total cutting out or not? Perhaps one of our resident EE's could chime in?
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Old 07-17-2013, 04:05 PM   #78797
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Quote:
Originally Posted by barko1 View Post
Recently I had a similar issue, changed out the fuel but it seemed so abrupt, seemed electrical. Happened in several gears and seemed to be when the engine was under a heavy/accelerating load. Today I rode it hard on some rougher dirt and it never happened.
Water in fuel can cause a sudden cutting out. It really can mimic an electrical problem. And sometimes if takes full throttle (and enough vacuum) to suck the water up from deep in the Carb Bowl. (water sinks in gasoline)

Draining Carb bowl or tank worth a shot ... can't hurt!
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Old 07-17-2013, 04:06 PM   #78798
thump!
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Quote:
Originally Posted by Adv Grifter View Post

I'm not certain if an intermittent Regulator/Rectifier could cause that sort of total cutting out or not? Perhaps one of our resident EE's could chime in?
Not likely as the ignition and charging systems are completely separate.
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Old 07-17-2013, 04:13 PM   #78799
ER70S-2
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Gas cap may not be venting properly.

My first guess would have been the inlet filter, but you BTDT.

If you're jetted for the open airbox, just closing the opening (closer to stock), you'll be jetted way too rich.
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Quote:
Originally Posted by Threewheelbonnie View Post
"BTW, I don't do style. It's a dirt bike, not some girlie dress-up thing." -
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Old 07-17-2013, 04:43 PM   #78800
Ever Onward
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Seat decisions

Sargeant vs Seat Concepts kit.

I need a comparison. Both in how the long term feel is and their shape / construction. How they effect seat width and height between the two would be great.
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Old 07-17-2013, 05:11 PM   #78801
Graniteone
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Sargents is very comfortable. But I prefer the Seat Concept seat I have now. I like a little narrow seat profile and I like the texture of the SC seat better. Just my .02.
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Old 07-17-2013, 05:28 PM   #78802
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Quote:
Originally Posted by Emmbeedee View Post
Sounds like a sidestand switch problem to me.
+1
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Old 07-17-2013, 05:41 PM   #78803
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Quote:
Originally Posted by Low Budget View Post
Sargeant vs Seat Concepts kit.

I need a comparison. Both in how the long term feel is and their shape / construction. How they effect seat width and height between the two would be great.
I have no comparison to make.

My purchase (today, in fact) of my first Sargeant saddle was determined by them creating a whole new seat pan from which to build off of. Sounds like a reasonable idea to me.
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Old 07-17-2013, 05:44 PM   #78804
barko1
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Quote:
Originally Posted by Adv Grifter View Post
Water in fuel can cause a sudden cutting out. It really can mimic an electrical problem. And sometimes if takes full throttle (and enough vacuum) to suck the water up from deep in the Carb Bowl. (water sinks in gasoline)

Draining Carb bowl or tank worth a shot ... can't hurt!
Did that to no avail, but thanks. There was some remains of an IMS gas cap in there which I removed and replaced but it still had the miss. May be that pesky sidestand but it sure would seem that it would be an issue in rougher terrain
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Old 07-17-2013, 07:56 PM   #78805
tlmaffucci
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Passive, cheap modifications

For example:
  • Magnetic oil plug
  • Fuel cap, fuel filter bag
  • Lucas fuel treatment (not as passive, but quite helpful)

Can anyone think of more?
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Old 07-17-2013, 08:28 PM   #78806
WhichWayNow
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Thanks for all of the replies. I have checked the fuel tank cap and vents, no clogs there. It has an IMS tank. The petcock came with the tank. It's a basic three position one; off, on and reserve. The stock vacuum operated one was removed.

I've had the carb apart so many times, the float bowl is clean. I also replaced the float assembly not long ago. I took the bike to a local shop and they put a rebuild kit in the carb (needle, emulsion tube, o-rings, etc...) None of that helped either.

I fiddled with the side stand this evening and don't think that is it, but I will try a bungee cord on it next time I ride it.

I'll look into more of the electrical side as well. I had to replace the stator at the end of '11 because it lost spark completely. Fortunately, I am an EE so if it is electrical, I can probably track that down.
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Old 07-17-2013, 09:34 PM   #78807
8gv
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Here's how you bypass the sidestand switch:

http://www.google.com/url?sa=t&rct=j...nHPE6RokJqOt_g
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Old 07-17-2013, 11:09 PM   #78808
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Quote:
Originally Posted by 8gv View Post
Here's how you bypass the sidestand switch:

http://www.google.com/url?sa=t&rct=j...nHPE6RokJqOt_g
That's a good video explanation and belongs in Krusty's Index.

http://www.advrider.com/forums/showt...=636395&page=5
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Quote:
Originally Posted by Threewheelbonnie View Post
"BTW, I don't do style. It's a dirt bike, not some girlie dress-up thing." -
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Old 07-17-2013, 11:45 PM   #78809
WhichWayNow
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Thumb

I have to give a big thanks to everyone who said to check the side stand switch.

I jumpered it out this evening and took the bike for a test ride. It ran great! No stumbles at all.

The way it was acting, I don't think I would have guessed that would have been the problem.

Once again, Thank you everyone!
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Old 07-17-2013, 11:57 PM   #78810
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Quote:
Originally Posted by 8gv View Post
.
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Quote:
Originally Posted by Threewheelbonnie View Post
"BTW, I don't do style. It's a dirt bike, not some girlie dress-up thing." -
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