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post #1 of 13 (permalink) Old 05-11-2011, 08:05 PM Thread Starter
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Running issue 650xt

I was wondering if anyone has had this issue and know a fix. When restarting my cat after engine is warm it back fires and sputters under low idle speeds. If you put the hammer down it takes off and runs fine. Then you can slow down and run at low speeds again with no problems. Almost like it is loading up when started. I have changed jets, needle, float,put a new gasket on exhaust header, changed plug. Still same issue. Any help would be appreciated. It does not do this when engine is cold.

2011 xtz white
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post #2 of 13 (permalink) Old 05-11-2011, 08:16 PM
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Originally Posted by dubbus6 View Post
I was wondering if anyone has had this issue and know a fix. When restarting my cat after engine is warm it back fires and sputters under low idle speeds. If you put the hammer down it takes off and runs fine. Then you can slow down and run at low speeds again with no problems. Almost like it is loading up when started. I have changed jets, needle, float,put a new gasket on exhaust header, changed plug. Still same issue. Any help would be appreciated. It does not do this when engine is cold.
Did the problem coincide with any of your mods? Checked your plug color after jetting? Have you adjusted your valves? Also check your plugwire.
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post #3 of 13 (permalink) Old 05-11-2011, 08:27 PM Thread Starter
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Problem did not start after any mods. Seemed to start after routine maintenance. Repacked exhaust. Checked plug before rejetting and it was black.(rich) checked after and it's a lot cleaner. Have not adjusted the valves in a while. Around 400 miles or so. Plug wire looks o.k. no signs of wear. Only have 1000 miles on it.

2011 xtz white
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28" zillas
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post #4 of 13 (permalink) Old 05-11-2011, 09:05 PM
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Do you smell gas when it is at low speeds and acting up?
When you do a plug check is it after a high speed run or just idling around? What we need to know is what or how were you driving right before you checked the plug?
What elevation are you at?
Have you installed a fuel filter?



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post #5 of 13 (permalink) Old 05-11-2011, 09:42 PM
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I would say valves after what i have witnessed and they are easy to check.

It is what it is....
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post #6 of 13 (permalink) Old 05-11-2011, 11:34 PM
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x2 I would check the valves.
Good precaution anyway.
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post #7 of 13 (permalink) Old 05-12-2011, 05:42 PM Thread Starter
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I checked plug after riding for a while. Also I do Smell gas sometimes when it was acting up. I am at around 600-1000 feet above sea level. Have not installed a fuel filter. It almost seems like the choke is stuck???

2011 xtz white
Custom snorkeled
ITP ss 312 wheels
28" zillas
QA1 350lb springs(rear)
HID's
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post #8 of 13 (permalink) Old 05-12-2011, 05:46 PM Thread Starter
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I did forget to mention that sometimes it is hard to start sometimes after riding a couple trails and then taking a quick break. It will crank but not start usually have to pump the pedal a couple times.

2011 xtz white
Custom snorkeled
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28" zillas
QA1 350lb springs(rear)
HID's
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post #9 of 13 (permalink) Old 05-12-2011, 05:46 PM
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That' what's I was leaning towards was the choke sticking. If it was mine I would pull the carb and take it apart and blow out all the passages. And would defiantly install a fuel filter.



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post #10 of 13 (permalink) Old 05-12-2011, 05:50 PM
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Pumping the pedal is doing no good other that giving it a lot of air. The accelerator pump on the stock 650 carb is not functional. It is there but there is no linkage to make it work. With it starting by you pumping it tells me it is flooded from the choke or float sticking. So when you pump it it gets alot of air to light off the over rich mixture.
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I did forget to mention that sometimes it is hard to start sometimes after riding a couple trails and then taking a quick break. It will crank but not start usually have to pump the pedal a couple times.


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