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Discussion Starter #1
Hi all! I am a newbie to the forum, also to the 400 Burgman. I once owned a 650 Burg, but it was too big and heavy to suit me. Anyway I recently traded my 1200 Yamaha Venture for an 07 400, and it is a theft recovery scoot. All the locks are jimmied and broken which doesn't concern me right now. The guy I traded with gave me a printout from a Suzuki dealer in SC saying the fuel pump was bad. I ordered a good used pump off the internet and installed it, but it still won't run well. It backfires thru the throttle body when the throttle is twisted, and the butterfly that u can see when the elbow is removed dances open and closed constantly. It even dances anytime the switch is turned on whether it is running or not. It is difficult to start, sometimes I have to stop up the venturi with my hand to get it started, and it idles very erraticly. It has very little power because of the missing and backfiring. I hope someone can point me in the right direction as to what to do, I am clueless! At least I am not scooterless, I have a Morphus 250 to ride, but when I get the Burg fixed, I am gonna try to get the wife into scooting. It only has a tick over 5,000 miles on it, all the parts look new except what the thieves broke stealing it (and a few battle scars). I will deal with that later after I see if I can get it running good. Please help me figure out what to do, I really will appreciate it very much. I live in the mountains of Western NC, near the Blue Ridge Parkway, and if it ever quits raining I am planning on doing some serious scooting! Thank all of you in advance, Jeff Boyter
 

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First job change the plug make sure its connection is on right and make sure
the coil is properly bolted to the frame and connections clean and tight.
 

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The butterfly you are referring to sounds like what they call the secondary throttle, it is suppose to modulate with throttle input and shouldn't be bouncing around as you are describing on its own. You could try taking the butterfly off (for testing purposes) after the bike is warmed up (It's also the choke when the bike is cold) and see if the bike runs any smoother.
 

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Man im Sick of these Fools, that's All People know how to do now is Steel, :?

Elliott,
 

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Discussion Starter #6
I have tried the suggestions mentioned on this forum, with no luck. It still bucks, snorts, backfires thru the throttle body, won't idle properly. Is there anything else I should be looking for? Fuel injection is wonderful until it breaks, then it's a nightmare. I wonder if all else fails could I put a carb on it? I would rather do that than spend out the wazoo trying to fix something the dealer cannot diagnose. The weather is getting better, and I would love to be tooling around on the Burg, but? If I cannot get it fixed for a decent cost, I guess I will sell it as is or part it out. I love the way it sits and feels, much lighter than the 650 I had, but this bug is driving me up the wall!!! Thanks again for your help, each one of you!
 

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Have you checked out the pair system?

I know that if the pair valve is allowing air into the exhaust in excess, it will cause backfiring. Check the Pair Hoses for leaks/cracks, and you could try blocking off the entry point at the reed valve (effectively by-passing the pair system) to see if that makes a difference.
 
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