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Discussion Starter #1
I just got my 600 running. Now it is blowing the carb off the intake. It does not backfire it's almost like it just slips off. It doesn't have very good throttle response and seems to take a while to rev up. It will pop out the exhaust a little when first exhilarating then goes away when you give it a little more throttle. I have the needle under the diaphragm set to the second clip up. Thanks for any help!


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Carb adapter boot torn?
Valve clearances adjusted correctly?
 

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could timing be off a hair?
 

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Discussion Starter #4
New boot and valves were just done. After I posted this I found a big hole in the muffler probably 3 inches in diameter on the top near the mount. Could this be part of it? Is it worth getting an aftermarket muffler or just try to patch this one?


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Yes the muffler can cause this, believe it or not.
Oem mufflers are crazy expensive. I did a full wrap repair on my 1998 600 muffler. But I also own a welder and had access to a metal roller.
 

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Discussion Starter #6
I can use the welders at work so that's no problem. I'll give it a shot today


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Did they make a 600 that didn't do this? Just kidding. I have owned and seen numerous 600s that do this. I'm in the salvage business and don't have a lot of good to say about the 600. In my opinion its one of the worst bikes Yamaha ever put out. They are also fire prone, I've seen more of them that have caught fire than all other bikes I've had come in combined. The advice DEEZ and others gave is gave is good but also make sure it doesn't have the knock off China carb on it. They are junk and I personally have hardly ever seen them run right on anything but youth bikes. Usually when a bike coughs it is not getting enough fuel so raising the needle can also help it.
 

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Also had a 45 dollars zoom zoom carb off ebay for 2 years and never had an issue, might of just got lucky tho cuz I've heard of a couple buddy's not having luck with them
 

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Discussion Starter #10
Still has the original carb on it. Got a new to me muffler dialed the carb in and now it's running awesome


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I've had this issue only once now I'm not sure what cause it ive been runnin a glass pack for over a year and just now am having problems but I think my problems are cause the header is about to fall out


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