vinnie Posted September 15, 2017 Share Posted September 15, 2017 Anyone know if I can adjust an idle screw for my FJ? It stalls every so often when the bike is cold and I just start it. The idle RPMs have been on the low side for a while now, though. The bike has 37k miles and the valves should be okay. Link to comment Share on other sites More sharing options...
Supporting Member betoney Posted September 15, 2017 Supporting Member Share Posted September 15, 2017 The bike has 37k miles and the valves should be okay. Should?... Meaning that they have never been checked? ***2015 Candy Red FJ-09*** Link to comment Share on other sites More sharing options...
skipperT Posted September 16, 2017 Share Posted September 16, 2017 The bike has 37k miles and the valves should be okay. Should?... Meaning that they have never been checked? Wait... what? Vinnie, there's NO basis that I can think of for that argument. Go get your valves checked and adjusted before you do anything else. Otherwise you will be wasting time, money and energy at finding a a solution to what (might be) a problem before you have a baseline of your bike being up to date on maintenance. Sorry to be harsh but that's my opinion. And no, the idle is NOT adjustable on any YCCT Yamaha machine. There are several reasons the bike might be reluctant to idle, start with the simple stuff first. -Skip. Link to comment Share on other sites More sharing options...
vinnie Posted September 18, 2017 Author Share Posted September 18, 2017 Should?... Meaning that they have never been checked? Wait... what? Vinnie, there's NO basis that I can think of for that argument. Go get your valves checked and adjusted before you do anything else. Otherwise you will be wasting time, money and energy at finding a a solution to what (might be) a problem before you have a baseline of your bike being up to date on maintenance. Sorry to be harsh but that's my opinion. And no, the idle is NOT adjustable on any YCCT Yamaha machine. There are several reasons the bike might be reluctant to idle, start with the simple stuff first. -Skip. Yea, they have been checked and adjusted already. They should still be good. I should have added *still* be okay in my original post. Link to comment Share on other sites More sharing options...
stuna Posted September 18, 2017 Share Posted September 18, 2017 clean the throttle plates Link to comment Share on other sites More sharing options...
vinnie Posted September 18, 2017 Author Share Posted September 18, 2017 clean the throttle plates I don't really know what that means. Are you saying to clean out the throttle body? Link to comment Share on other sites More sharing options...
stuna Posted September 19, 2017 Share Posted September 19, 2017 yup dirty plates will affect base idle Link to comment Share on other sites More sharing options...
skipperT Posted September 20, 2017 Share Posted September 20, 2017 What he said. This will only help if your lack of idle is due to carbon build up. Check the cyl side of the throttle plates and see if they're gummed up. Link to comment Share on other sites More sharing options...
vinnie Posted October 6, 2017 Author Share Posted October 6, 2017 I'm still not sure what it means to clean the throttle plates. However, the problem seems to be getting worse. It's only after starting it when it's cold. It usually fires up immediately after, but last night, my bike stalled at a stop sign and took about 4-5 seconds of holding the start button to get it fired up. I ran Seafoam through a tank last week, which I rode through in one day, and no changes there. I am going to put a new air filter (almost ready to put one on anyways), new spark plugs, and do a compression test while I'm in there. Link to comment Share on other sites More sharing options...
skipperT Posted October 7, 2017 Share Posted October 7, 2017 Sorry you are still having issues. Please post the results of your compression test. Bear in mind, that with YCCT the throttle plates may not stay open even if you are giving it full throttle while cranking the engine. So to get an accurate compression test you’ll need to manually open them up. If you pry open the throttle plates and see a lot of black/dark residue on either side of the 3 throttle plates and the inside of the throttle bodies - that means you should clean off all that gunk (usually carbon buildup). Then you will need to reset the “learned idle value” in the ECM which must be done with the dealer software. -Skip. Link to comment Share on other sites More sharing options...
norcal616 Posted October 7, 2017 Share Posted October 7, 2017 are you using Iridium spark plugs? or still on stock plugs? 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...
xlxr Posted October 7, 2017 Share Posted October 7, 2017 What is your idle RPM, engine hot and cold? Is your engine RPM always higher when cold? Does it have a consistent idle when hot? Have your resynched throttle bodies recently? A complete basic tune up is a good place to start. If you plan on trying to fix it yourself, you must get a factory service manual. If it dies when cold, look into what ever mechanism the FJ 09 uses to increase idle when cold. If it dies when hot, look elsewhere. Unfortunately, I seem to have forgotten more than I remember, so I am not sure if the FJ 09 has one, but there is something called a stepper motor that kicks in when engine is cold to increase idle. Google how to clean throttle plates (or throttle bodies), lots of videos out there, even if not about FJ 09, you will get the idea. Link to comment Share on other sites More sharing options...
brokenhat Posted October 7, 2017 Share Posted October 7, 2017 My 2 week old 2017 does as well, not enough to really bother me but I notice it especially compared to other bikes I've had. Link to comment Share on other sites More sharing options...
skipperT Posted October 7, 2017 Share Posted October 7, 2017 Xlxr- the ecm uses the stepper motor to control the amount of airflow by opening and closing the throttle plates in the throttle bodies. That’s it. The only adjustment is resetting the value I discussed above, and cleaning the throttle bodies. There are contributing factors as well (tight valves, vacuum leak, water in the gas, poor spark, etc.) to whether the bike will idle. Google YCC-T for a good explanation. It’s been used by Yamaha since 05 or 06 IIRC. -Skip Link to comment Share on other sites More sharing options...
skipperT Posted October 7, 2017 Share Posted October 7, 2017 (Sorry, I was trying to be helpful in the above comment, no offense intended. It sounded strange when I proof read it) Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.