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Old 11-08-2009, 07:42 PM   #1
34for40dave OP
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Bogging Pig. XR650R Conundrum. Please Help!

Been chasing this problem for a month. Big ride coming up next weekend.

The bike: 2005 XR650R with less than 1,000 hours. New BD DSK.

Symptom: Bike bogs under load. ie. Throttle shot to wheelie, motor bogs. Hit the throttle at speed, bike bogs. Climb a hill, bike bogs. And sometimes, it just bogs. Bike starts very easily. Idles fine. Some backfiring when hard throttling in neutral.

My definition of bogs: Engine feels as though it is running out of gas.

What it isn't: The carburetor. Have switched carbs. Runs exactly the same on either carb.

What I have tested and passed:

No intake leak.

Nothing in the air intake. Have removed the air filter.

Not the gas. High octane. Low octane. Tried them all.

Not the spark plug. It has been replace 3 times. Shows great spark when tested.

Other tests:

Removed the dual sport kit to ensure there isn't an AC/DC ground/floating ground issue.

Adjusted the valves. Runs better since but still problematic.

Ran the bike in a dark garage to search for an errant spark.

What I have not been able to test due to not having the special tool for amp meter.

coil

cdi

I think this is an electrical problem. I guess my question is what could be going bad that would cause the spark to go weak during a load on the engine?

I have not taken it to the dealer because I worry they will charge me $100 an hour just to replace parts I can buy cheaper on the net and replace myself.
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Old 11-08-2009, 08:44 PM   #2
RecycledRS
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Check fuel flow to carb?
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Old 11-09-2009, 06:48 AM   #3
34for40dave OP
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Fuel flow checked. Have a clear line between tank and carb. Definitely has gas flowing.

Also checked and cleaned the pit cock filter.

No other fuel filter on bike.
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Old 11-09-2009, 08:31 AM   #4
D.T.
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Test compression? Valve or head gasket leaking?

Only bogs at WOT? Wrong size main jet? Are you short shifting and a heavy person? Did it pull hard a few months ago? What did you alter?

Quote:
New BD DSK
What is this??
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Old 11-09-2009, 08:47 AM   #5
larryboy
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Quote:
Originally Posted by D.T.
Wrong size main jet?

Yeah, what's the jetting like? Piped and all of that stuff? I've found most of the so called "experts" on the web to recommend jetting that is far too rich.
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Old 11-09-2009, 11:30 AM   #6
biscuit
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Stock stator with the dual sport kit?

I'd check that next, then.
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Old 11-09-2009, 04:00 PM   #7
Jonex
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Quote:
Originally Posted by larryboy
Yeah, what's the jetting like? Piped and all of that stuff? I've found most of the so called "experts" on the web to recommend jetting that is far too rich.

Amen. Too rich = fouled plug(s).
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Old 11-09-2009, 07:45 PM   #8
34for40dave OP
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Should have put that in the tests completed. Not too rich or lean. Adjusted the Edelbrock from way lean to way rich. Of course there was some issues in each of the extremes but the bottom line is that making changes to the carb did not fix the problem. Again, I think this is electrical. I remember an old car that use to bog down when the engine was under a load. Accelerating, climbing a hill, etc. The result was a poor spark under load but for the life of me I can't remember what was changed to fix the problem. I just replaced the cdi with one from another bike I have and it did not solve the problem. So the CDI isn't bad. I guess tomorrow I will somehow check the coil.

Again, it starts on first kick. It just doesn't want to run right. Slow acceleration it is fine. Give it the gas hard and it just bogs out.

Oh, and I rechecked the valves tonight. Exhaust perfect. One of the intake was a little tight. It's been readjusted and bike still runs bad.

Frustrated,

Dave
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Old 11-09-2009, 11:43 PM   #9
eshaw
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hmmm

I say its something to do with the accelerator pump. Now pay close attention... I dont know shat about carbs... , ok, a little more than that? Just sounds like giving it gas is the problem, and what I know about carbs (as you might recall, I dont know shat so this should be useful ) it sounds like an accelerator pump issue. The eddlebrock manual shows an adjustment for that (If I hear right that is what you have...pumper i assume, same as mine). good luck whatever it is.

Seems like if it was electrical it would be an RPM issue, not a throttle position issue. I've had a car do the high RPM cut out, but it was not related to throttle position unless RPM's were hight. I'd focus on carb adjustments, but if you do you'd be doing what I do, and I don't know that I'd always recommend that. Remember, good luck.

e
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Old 11-10-2009, 06:09 AM   #10
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I had the exact same problem with my pig when it was equipped with a Mikuni TM-40. No amount of fiddling with the jetting or the accelerator pump would fix it. I put a stock carb back on and problem solved. I know that doesn't help you, but that's my story.
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Old 11-10-2009, 07:26 AM   #11
34for40dave OP
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Scribe,

I hope that is not it. I bought the the Edelbrock because I was having problems with the factory carb. With the 'brock the problem was accentuated. So I have a new TM40 on the way.

Again, I do not think this is a carb issue since I have tinkered with two different carbs for hours and hours and hours.

Going to move to the coil tonight.
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Trans-Americas World Record Holder - 27:7:52

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Old 11-10-2009, 08:24 AM   #12
Reposado1800
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Quote:
Originally Posted by 34for40dave
Been chasing this problem for a month. Big ride coming up next weekend.

The bike: 2005 XR650R with less than 1,000 hours. New BD DSK.

Symptom: Bike bogs under load. ie. Throttle shot to wheelie, motor bogs. Hit the throttle at speed, bike bogs. Climb a hill, bike bogs. And sometimes, it just bogs. Bike starts very easily. Idles fine. Some backfiring when hard throttling in neutral.

My definition of bogs: Engine feels as though it is running out of gas.

What it isn't: The carburetor. Have switched carbs. Runs exactly the same on either carb.

What I have tested and passed:

No intake leak.

Nothing in the air intake. Have removed the air filter.

Not the gas. High octane. Low octane. Tried them all.

Not the spark plug. It has been replace 3 times. Shows great spark when tested.

Other tests:

Removed the dual sport kit to ensure there isn't an AC/DC ground/floating ground issue.

Adjusted the valves. Runs better since but still problematic.

Ran the bike in a dark garage to search for an errant spark.

What I have not been able to test due to not having the special tool for amp meter.

coil

cdi

I think this is an electrical problem. I guess my question is what could be going bad that would cause the spark to go weak during a load on the engine?

I have not taken it to the dealer because I worry they will charge me $100 an hour just to replace parts I can buy cheaper on the net and replace myself.
Maybe your cam chain is stretched too much and fouling up your cam timing. 1000 engine hours is quite a bit for a dirt bike. Worth a check.
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Old 11-10-2009, 06:46 PM   #13
HighwayChile
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you said 3 plugs , jetting is fine,... does that mean plug color is correct? whats the plug look like. it may be ok but its not mentioned.
i know you have said its not the carb but it sounds like a main jet issue???
since low rpm, starting etc are ok.

just probing. good luck.
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Old 11-10-2009, 06:55 PM   #14
scarysharkface
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My DR350 behaves similarly. I eagerly await the outcome of this, so I know where else to look on mine...

Good luck.
John
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Old 11-10-2009, 07:03 PM   #15
cyclewizard
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Check your stator.....
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