BVEBRAD Posted September 30, 2017 Share Posted September 30, 2017 I have 15,000+ miles on my FJ now. To date the only service done to the bike was the initial 600 mile (I believe) break in service and 3 oil/filter changes that I did. My bike also has a Kev's O2 controller on it. My bike has started to run very poorly when between 3500-4500 rpms. I would describe it as jerky or go as far as saying it's "missing". I was wondering if it's possibly related to the O2 controller or if the bike just needs serviced. I do plan on pulling the controller off to see if it improves. I also believe my chain and sprockets are due for replacement. Can anyone with an O2 controller or anyone for that matter offer any feedback? Brad Selbyville, DE Link to comment Share on other sites More sharing options...
xlxr Posted September 30, 2017 Share Posted September 30, 2017 Throttle body sync is first step, new spark plugs since you have the tank out of the way wouldn't hurt. Link to comment Share on other sites More sharing options...
skipperT Posted September 30, 2017 Share Posted September 30, 2017 Bvebrad - you said that you have a new chain and sprockets planned. Put her on the center stand, and slowly turn the back wheel - looking for a much tighter spot vs a much loser spot in the tension. If so, replace that first before worrying about anything else. It’s a good possibility that’s what you are feeling. If not - the other advice given here are all good first steps. HTH, -Skip Link to comment Share on other sites More sharing options...
BVEBRAD Posted September 30, 2017 Author Share Posted September 30, 2017 Skipper T, thanks for the reply, I do believe the chain may be a big part of the problem. I will certainly try your recommendation. Thanks again. Brad Selbyville, DE Link to comment Share on other sites More sharing options...
BVEBRAD Posted September 30, 2017 Author Share Posted September 30, 2017 I just watched a video on how to change the plugs last night. I already have the plugs. Replacing them looks like a real PITA but what do ya do. Things were much easier in the ole days. Brad Selbyville, DE Link to comment Share on other sites More sharing options...
skipperT Posted September 30, 2017 Share Posted September 30, 2017 I just watched a video on how to change the plugs last night. I already have the plugs. Replacing them looks like a real PITA but what do ya do. Things were much easier in the ole days. They’re really not a big deal. Hardest part is usually getting the coil packs out of the cylinder head. I swear Yamaha engine builders pound those suckers in with a rubber mallet! Good luck! -S Link to comment Share on other sites More sharing options...
xlxr Posted October 1, 2017 Share Posted October 1, 2017 The coil packs are easy to get off. I put tape around some long nose needle plies and put the taped ends under the coil. I stuffed a rag under the middle of the pliers to act as a fulcrum to lever up the coil packs. I used my fingers to pull up on the coil pack at the same time to take as much pressure off the pliers as possible. Before putting them back on, be sure to apply some spark plug boot grease. Link to comment Share on other sites More sharing options...
BVEBRAD Posted October 11, 2017 Author Share Posted October 11, 2017 I have 15,000+ miles on my FJ now. To date the only service done to the bike was the initial 600 mile (I believe) break in service and 3 oil/filter changes that I did. My bike also has a Kev's O2 controller on it. My bike has started to run very poorly when between 3500-4500 rpms. I would describe it as jerky or go as far as saying it's "missing". I was wondering if it's possibly related to the O2 controller or if the bike just needs serviced. I do plan on pulling the controller off to see if it improves. I also believe my chain and sprockets are due for replacement. Can anyone with an O2 controller or anyone for that matter offer any feedback? Brad Selbyville, DE Link to comment Share on other sites More sharing options...
BVEBRAD Posted October 11, 2017 Author Share Posted October 11, 2017 Just a quick followup on this, it turns out the problem was a tank of bad gas. Once I ran out the tank and filled with good gas she runs great again. I still need to replace the chain/sprockets but I'll finish out the season on the old ones. Brad Selbyville, DE Link to comment Share on other sites More sharing options...
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