Hdgunnell Posted March 31, 2017 Share Posted March 31, 2017 Hey folks. I purchased a 2015 through a private sale with 9000 miles, brought to the dealer for maintenance and all that (documented). I finally have had the weather to ride it and I've discovered that when cruising and decelerating there is a constant sort of surging going on. It's jerky, and feels like an engine or chain problem. If I clutch in it minimizes or gets rid of the problem. Accelerating I feel nothing or its not there. I took it into a local mechanic I've had good luck with and they thought the problem was that the rear axle was off a bit, and was causing the chain to move around? He explained that the sprocket was almost clean and unused on one side with the other side worn and dirty (I don't really know what this means). They claimed they fixed that, and that it fixed the problem. I went for an hour ride to enjoy the weather (its going to snow tomorrow, hooray for NE), and the problem was defiantly still there. Anyone have similar problems, know a fix, or know the problem I have? Link to comment Share on other sites More sharing options...
docsimple Posted March 31, 2017 Share Posted March 31, 2017 i'd bet either a flash of the ecu or kev's 02 mod would fix it. Of course I am NOT a mechanic I am just someone who had issues with surging at low speeds and used the o2 mod to fix the issue. 2015 Red FJ 09 2013 WR250R - little boy blue - sold 2012 DL650 V Strom - sold 2007 FZ6 - sold 1986 FJ600 - sold Link to comment Share on other sites More sharing options...
Hdgunnell Posted March 31, 2017 Author Share Posted March 31, 2017 Both, I can feel it quite well. It's almost like small braking. I can also hear it, the engine follows with the movement in sound. Link to comment Share on other sites More sharing options...
norcal616 Posted March 31, 2017 Share Posted March 31, 2017 Is the TC light going off when its surging? 2012 wr250f - C-class 30+ age group 2015 fz-07- Hordpower Edition-80whp 2015 fj-09- Graves Exhaust w/Woolich tune by 2WDW @120whp Link to comment Share on other sites More sharing options...
Hdgunnell Posted March 31, 2017 Author Share Posted March 31, 2017 No TC light, and rolling on minimizes it or makes it go away. Being in a higher gear makes it seems less noticeable, but cruising, engine braking, and low speeds its very noticeable. Link to comment Share on other sites More sharing options...
duhs10 Posted March 31, 2017 Share Posted March 31, 2017 Did we finally figure out what not doing a throttle body sync will cause??? Sorry you're dealing with this.. no surging on my '15. '15 FJ-09 w/ lots of extras... Fayetteville, GA, USA Link to comment Share on other sites More sharing options...
nsmiller Posted March 31, 2017 Share Posted March 31, 2017 Did we finally figure out what not doing a throttle body sync will cause??? Sorry you're dealing with this.. no surging on my '15. I totally agree with this. The first thing I would do is a Throttle Body Sync to see if that cures it. While you're there you could opt to look at the spark plugs and possibly change them since I doubt they've ever been changed. The service manual says they should be replaced at 8K miles and you said you're at 9. See my YouTube videos on TBS and spark-plug replacement. Link to comment Share on other sites More sharing options...
norcal616 Posted March 31, 2017 Share Posted March 31, 2017 There is also the " tilt over " sensor which is located right under the seat.. 2012 wr250f - C-class 30+ age group 2015 fz-07- Hordpower Edition-80whp 2015 fj-09- Graves Exhaust w/Woolich tune by 2WDW @120whp Link to comment Share on other sites More sharing options...
scaley Posted March 31, 2017 Share Posted March 31, 2017 check for air getting in between throttle body and cylinder head. ie. check they are seated and clamped correctly and that the rubber nipples sealing the vacuum take off are in good condition. Any extra air getting into the intakes will cause surging. Could be worth pushing some injector cleaner through with the fuel too, if the bike has stood for some time before you got it. Link to comment Share on other sites More sharing options...
koth442 Posted March 31, 2017 Share Posted March 31, 2017 Can you replicate the surging in neutral? '15 FJ09 Link to comment Share on other sites More sharing options...
Supporting Member betoney Posted March 31, 2017 Supporting Member Share Posted March 31, 2017 It's jerky, and feels like an engine or chain problem. If I clutch in it minimizes or gets rid of the problem. Accelerating I feel nothing or its not there. the sprocket was almost clean and unused on one side with the other side worn and dirty It sounds like your chain adjusters were previously set wrong, wearing the sprocket on only one side? When they re-adjusted it, they probably set chain slack to factory specs. The manual that tells you to sync your throttle bodies every 4,000 miles and replace spark plugs every 8,000 miles also tells you to set your chain slack at 0.20 - 0.59 inch. Try the simple things first, inspect your sprockets for damage and your chain for kinks or tight spots, then set the chain slack a little looser than factory recommendations. ***2015 Candy Red FJ-09*** Link to comment Share on other sites More sharing options...
Hdgunnell Posted March 31, 2017 Author Share Posted March 31, 2017 Thanks for all the responses. I can't replicate it in neutral as far as I know. Could it be a problem with the air filter? I haven't had the chance to open it up or change anything yet. Link to comment Share on other sites More sharing options...
Hdgunnell Posted March 31, 2017 Author Share Posted March 31, 2017 It's currently snowing right now and I have the bike tucked away in the garage. I'm bringing it to a well trusted home business motorcycle mechanic later this week. I'll let y'all know the results. Thanks for all the replies again. Link to comment Share on other sites More sharing options...
koth442 Posted March 31, 2017 Share Posted March 31, 2017 If you can't replicate the problem in neutral then the issue is caused by something after the crankshaft (so to speak). Like the chain, or gear box, etc etc. '15 FJ09 Link to comment Share on other sites More sharing options...
norcal616 Posted March 31, 2017 Share Posted March 31, 2017 Is the clutch still adjusted to spec? 2012 wr250f - C-class 30+ age group 2015 fz-07- Hordpower Edition-80whp 2015 fj-09- Graves Exhaust w/Woolich tune by 2WDW @120whp Link to comment Share on other sites More sharing options...
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