I have a 97 F3. I recently replaced the plugs with ngk's and it was running great for 1k+. Now at idle it sounds like its running rich or its miss firing. I have been having some issues with it not starting easily as well.. rough/low idle Any help would be appreciated...
Thanks

 

sounds like its fouled out and its not firing on all cylinders. check the plugs
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Does that realy happen? I have 2strokes and am used to plug problems... I just wasnt sure if it would be the plugs.. Think it could be the Gas? or stuck slides on the carbs?...Thanks for the help

 

well it could be those too, but with these bikes and what i have seen, 9 out of 10 times its the plugs. those are the easiest to check anyways, so pull them out 1 by 1, ground it out and check to see if all of them are sparking
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I've had this problem with an F2 and it's probably related to E-10 gasoline. The ethanol in E-10 gas can cause things that weren't affected by straight gas to dissolve and collect in your carb jets. Since the primary jets are smaller than the secondary jets, they are more prone to clogging.When you open the throttle,the plugged primary jets fail to provide enough fuel to run the motor, so the motor leans out. At higher RPMs, the secondaries kick in. Being bigger, they are less prone to clogging, consequently, your higher rpm (4k+) performance isn't affected or is affected much less. It might take a while to clear up, but if you run several tanks with Seafoam gas treatment, it should clear up. Either that or spend $300 to have your carbs overhauled. BTW, I have no affiliation with Seafoam, but I tried a bunch of other products, some cheaper, some more expensive, and Seafoam was the only one that resolved this issue for me.

My $.02, for what it's worth...

JRM

P.S. I suspect that revving the motor with Seafoam in it might not help much. Most of the gas will be passing through the secondaries. On the other hand, I'm not sure how good of an idea it would be to leave the bike idling for a long period of time either...

 

It usually takes a period of sitting around for the carbs to be plugged up. I would check a couple other things first, air filter and fuel filter. When was the last time they were changed out. Also, check the battery voltage. If the battery voltage is low, your ignition doesn't have enough voltage to make adequate spark. They are easy checks without having to spend any money. Unless you don't have a digital multimeter that is.