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Old 07-17-2013, 01:02 PM   #78811
Albie
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Originally Posted by Rusty Rocket View Post
Still hate tire changes more.
So do I, but then I change tires a hell of a lot more often then I change oil.
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Old 07-17-2013, 02:08 PM   #78812
WhichWayNow
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Question Bike problem

I hate to interrupt another oil discussion, but I'm looking for some ideas on a problem that I have been having with my DR.

The bike is an '09 with over 25,000 miles on it. It has been well maintained with regular oil changes, valve adjustments, air cleaner cleanings, etc... It has an FMF Q4 pipe. The air box has been modded with most of the top cut out.

The problem started last summer. When passing at highway speeds, the engine will start to accelerate. It will then stop running completely for about a second or so, backfire and then accelerate again.

This problem has gotten progeressively worse. It has gotten to the point where the issue will occur while riding uphill at moderate throttle opening. It can even happen repeatedly sometimes at lower cruising throttle positions.

The problem is specific to certain specific throttle/load/rpm conditions. It does not appear to be random in nature.




I've spent a lot of time diagnosing this issue without any success in resolving it. The following are some of the things that I have looked into.
  • Cleaned the air cleaner. It is definitely not clogged
  • Adjusted main jets and needle richer, leaner and everywhere in between
  • Cleaned the carburetor throughly, including completely disassembling everything
  • Verified free flow of fuel out of the petcock. I removed the fuel line and opened the petcock. Fuel flowed out steadily. I also verified that the fuel line is not kinked.
  • I removed the little fuel strainer from the BST inlet.
  • Replaced the BST with a TM40 Pumper carb. The issue must not be the carb, because it is still happening with the TM40
  • New spark plugs
  • Adjusted valves
  • Added a cover on the top of the air box to restore nearly stock air opening
Basically I've tried all of the obvious steps that I can think of. Has anyone else run into this sort of issue? Does anyone have any idea where to look next?

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Old 07-17-2013, 02:15 PM   #78813
dankatz
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Quote:
Originally Posted by WhichWayNow View Post
I hate to interrupt another oil discussion, but I'm looking for some ideas on a problem that I have been having with my DR.

The bike is an '09 with over 25,000 miles on it. It has been well maintained with regular oil changes, valve adjustments, air cleaner cleanings, etc... It has an FMF Q4 pipe. The air box has been modded with most of the top cut out.

The problem started last summer. When passing at highway speeds, the engine will start to accelerate. It will then stop running completely for about a second or so, backfire and then accelerate again.

This problem has gotten progeressively worse. It has gotten to the point where the issue will occur while riding uphill at moderate throttle opening. It can even happen repeatedly sometimes at lower cruising throttle positions.

The problem is specific to certain specific throttle/load/rpm conditions. It does not appear to be random in nature.




I've spent a lot of time diagnosing this issue without any success in resolving it. The following are some of the things that I have looked into.
  • Cleaned the air cleaner. It is definitely not clogged
  • Adjusted main jets and needle richer, leaner and everywhere in between
  • Cleaned the carburetor throughly, including completely disassembling everything
  • Verified free flow of fuel out of the petcock. I removed the fuel line and opened the petcock. Fuel flowed out steadily. I also verified that the fuel line is not kinked.
  • I removed the little fuel strainer from the BST inlet.
  • Replaced the BST with a TM40 Pumper carb. The issue must not be the carb, because it is still happening with the TM40
  • New spark plugs
  • Adjusted valves
  • Added a cover on the top of the air box to restore nearly stock air opening
Basically I've tried all of the obvious steps that I can think of. Has anyone else run into this sort of issue? Does anyone have any idea where to look next?

I don't have an aftermarket pipe, but had a similar problem on my last trip (2008 with 21k miles). On my bike, it was obvious to me what the issue was - a burned clutch. Any uphill it would stop accelerating and sometimes even loose speed. Maybe, your clutch is slipping? Is it the original?
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Old 07-17-2013, 02:19 PM   #78814
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Quote:
Originally Posted by dankatz View Post
I don't have an aftermarket pipe, but had a similar problem on my last trip (2008 with 21k miles). On my bike, it was obvious to me what the issue was - a burned clutch. Any uphill it would stop accelerating and sometimes even loose speed. Maybe, your clutch is slipping? Is it the original?
I have had the clutch replaced. I did have a slipping issue a while back. This is an engine problem where the engine quits running completely for a breif moment.
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Old 07-17-2013, 02:25 PM   #78815
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Quote:
Originally Posted by WhichWayNow View Post
I have had the clutch replaced. I did have a slipping issue a while back. This is an engine problem where the engine quits running completely for a breif moment.
Sounds like a sidestand switch problem to me. Try holding the stand up with a bungee to see if it happens again.

My DR was cutting out, confirmed by the method I mentioned above, and a new set of sidestand return springs cured it.

In fact now that I see your original description, I'm sure that this is your problem. Passing at speed is exactly where I had the same problem as you describe.
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Old 07-17-2013, 02:38 PM   #78816
WhichWayNow
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Quote:
Originally Posted by Emmbeedee View Post
Sounds like a sidestand switch problem to me. Try holding the stand up with a bungee to see if it happens again.

My DR was cutting out, confirmed by the method I mentioned above, and a new set of springs cured it.
Interesting thought, I'll check that out. I would think that it would cut out when I hit bumps if that were the case. I haven't noticed any correlation there, but it's worth checking out.
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Old 07-17-2013, 02:42 PM   #78817
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Quote:
Originally Posted by WhichWayNow View Post
Interesting thought, I'll check that out. I would think that it would cut out when I hit bumps if that were the case. I haven't noticed any correlation there, but it's worth checking out.
I think vibration at passing speed and leaning out to pass is what makes it happen then. Bumps didn't have any effect, on my bike.
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"The motorcycle, being poorly designed for both flight and marine operation, sustained significant external and internal damage," police noted.
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Old 07-17-2013, 02:56 PM   #78818
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Quote:
Originally Posted by WhichWayNow View Post
I have had the clutch replaced. I did have a slipping issue a while back. This is an engine problem where the engine quits running completely for a breif moment.
That is odd - I agree. Do you think the petcock maybe malfunctioning sometimes?
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Old 07-17-2013, 02:56 PM   #78819
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Quote:
Originally Posted by WhichWayNow View Post
Interesting thought, I'll check that out. I would think that it would cut out when I hit bumps if that were the case. I haven't noticed any correlation there, but it's worth checking out.
I'd that's not it, inspect your other electrical connections, under the seat and tank. Not sure which tank you're running, but you may have a kinked vacuum line that is restricting flow intermittently.
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Old 07-17-2013, 02:58 PM   #78820
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Quote:
Originally Posted by Emmbeedee View Post
I think vibration at passing speed and leaning out to pass is what makes it happen then. Bumps didn't have any effect, on my bike.
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.
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Old 07-17-2013, 02:59 PM   #78821
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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, 03:05 PM   #78822
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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, 03:06 PM   #78823
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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, 03:13 PM   #78824
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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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Old 07-17-2013, 03:43 PM   #78825
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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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