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[quote="bennylupid"]Hi everyone. Before I say anything about the troubles ive been having with my bike I just wanted to say how much I appreciate this resource! It's been a life saver as a new rider/amateur mechanic. I have a 1998 Ninja 250 and ever since I got the bike it has had issues on cold starts. I've done a lot of digging online and posted on other forums but to no avail. Hoping the experts on this forum can help me out... The process goes like this. i turn on my bike with choke fully on. it starts up just fine and idles around 3-4k for about 30 seconds. after that the idle starts to drop and it will completely die if i don’t feather the throttle to keep it running. i feather the throttle for about 60-90 seconds to keep it running, after that it will generally settle back around 4-5k with choke still fully on. then it will take, i wanna say, around 6-8 minutes while slowly turning the choke down and allowing the bike to warm up before it will settle at the idle i have set. then i can ride off, runs and drives real smooth, however engine will sometimes drop in revs and die when i come to a stop light. i’m looking for some next steps i can take to try to take that time way down, plus that little feathering the throttle situation at the start. from what i've seen this is not normal for a healthy ninja. This is the work I've done on the bike so far and has not helped the problem: - Cleaned and synced carbs, replaced gaskets, float needles, and mixture screws. Mixture screws are set to around 3.5 - 4 turns out. I had been struggling with a hanging idle and syncing/tuning the mixture screws seemed to fix that problem. - Checked the air filter. Fairly clean, no problem there - Checked/regapped my spark plugs before I cleaned the carb, they looked in decent shape but I've attached some photos anyways. Maybe I should check them again now that the carb has been cleaned and retuned? Hopefully some of you will have some insight and some things for me to try. Thanks a lot for all your help![/quote]
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<table border="0" cellpadding="3" cellspacing="1" width="100%" class="forumline"> <tr> <td width="15%" align="left" valign="top" class="row1"><span class="name"><a href="profile.php?mode=viewprofile&u=-1" name="867420"><b>bennylupid</b></a></span></td> <td class="row1" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><span class="postdetails"><img src="templates/ninja250rc/images/icon_minipost.gif" width="12" height="9" alt="Post" title="Post" border="0" /> Posted: Thu Mar 07, 2024 5:17 pm<br> <img src="templates/ninja250rc/images/spacer.gif" width="12" height="9"> Subject: <a href="viewtopic.php?p=867420">On Valves...</a></span></td> </tr> <tr> <td colspan="2"><hr align="left" /></td> </tr> <tr> <td colspan="2"><span class="postbody">Haven't checked the valves, I've mostly been trying to eliminate any other causes before touching the valves. Good to know they are particularly crucial on this bike... this will be my next course of action and I'll check back after. Thanks a lot!</span> </td> </tr> </table></td> </tr> <tr> <td colspan="2" height="1" class="spaceRow"><img src="templates/ninja250rc/images/spacer.gif" alt="" width="1" height="1" /></td> </tr> <tr> <td width="15%" align="left" valign="top" class="row2"><span class="name"><a href="profile.php?mode=viewprofile&u=5" name="867419"><b>MIK</b></a></span></td> <td class="row2" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><span class="postdetails"><img src="templates/ninja250rc/images/icon_minipost.gif" width="12" height="9" alt="Post" title="Post" border="0" /> Posted: Mon Mar 04, 2024 5:36 pm<br> <img src="templates/ninja250rc/images/spacer.gif" width="12" height="9"> Subject: <a href="viewtopic.php?p=867419">Also</a></span></td> </tr> <tr> <td colspan="2"><hr align="left" /></td> </tr> <tr> <td colspan="2"><span class="postbody">I used to warm up my bike under load. Start it, and ride away, keeping a bit more throttle if needed. But checking valves would be my next step in either case. It's a high reving little motor, they need to be checked/adjusted regularly.</span> </td> </tr> </table></td> </tr> <tr> <td colspan="2" height="1" class="spaceRow"><img src="templates/ninja250rc/images/spacer.gif" alt="" width="1" height="1" /></td> </tr> <tr> <td width="15%" align="left" valign="top" class="row1"><span class="name"><a href="profile.php?mode=viewprofile&u=5" name="867418"><b>MIK</b></a></span></td> <td class="row1" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><span class="postdetails"><img src="templates/ninja250rc/images/icon_minipost.gif" width="12" height="9" alt="Post" title="Post" border="0" /> Posted: Mon Mar 04, 2024 5:33 pm<br> <img src="templates/ninja250rc/images/spacer.gif" width="12" height="9"> Subject: <a href="viewtopic.php?p=867418">What about valves? Have you checked those?</a></span></td> </tr> <tr> <td colspan="2"><hr align="left" /></td> </tr> <tr> <td colspan="2"><span class="postbody"></span> </td> </tr> </table></td> </tr> <tr> <td colspan="2" height="1" class="spaceRow"><img src="templates/ninja250rc/images/spacer.gif" alt="" width="1" height="1" /></td> </tr> <tr> <td width="15%" align="left" valign="top" class="row2"><span class="name"><a href="profile.php?mode=viewprofile&u=-1" name="867417"><b>bennylupid</b></a></span></td> <td class="row2" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><span class="postdetails"><img src="templates/ninja250rc/images/icon_minipost.gif" width="12" height="9" alt="Post" title="Post" border="0" /> Posted: Thu Feb 29, 2024 7:01 pm<br> <img src="templates/ninja250rc/images/spacer.gif" width="12" height="9"> Subject: <a href="viewtopic.php?p=867417">Cold start issues...</a></span></td> </tr> <tr> <td colspan="2"><hr align="left" /></td> </tr> <tr> <td colspan="2"><span class="postbody">Hi everyone. Before I say anything about the troubles ive been having with my bike I just wanted to say how much I appreciate this resource! It's been a life saver as a new rider/amateur mechanic. <br /> <br />I have a 1998 Ninja 250 and ever since I got the bike it has had issues on cold starts. I've done a lot of digging online and posted on other forums but to no avail. Hoping the experts on this forum can help me out... <br /> <br />The process goes like this. i turn on my bike with choke fully on. it starts up just fine and idles around 3-4k for about 30 seconds. after that the idle starts to drop and it will completely die if i don’t feather the throttle to keep it running. i feather the throttle for about 60-90 seconds to keep it running, after that it will generally settle back around 4-5k with choke still fully on. then it will take, i wanna say, around 6-8 minutes while slowly turning the choke down and allowing the bike to warm up before it will settle at the idle i have set. then i can ride off, runs and drives real smooth, however engine will sometimes drop in revs and die when i come to a stop light. <br /> <br />i’m looking for some next steps i can take to try to take that time way down, plus that little feathering the throttle situation at the start. from what i've seen this is not normal for a healthy ninja. This is the work I've done on the bike so far and has not helped the problem: <br />- Cleaned and synced carbs, replaced gaskets, float needles, and mixture screws. Mixture screws are set to around 3.5 - 4 turns out. I had been struggling with a hanging idle and syncing/tuning the mixture screws seemed to fix that problem. <br />- Checked the air filter. Fairly clean, no problem there <br />- Checked/regapped my spark plugs before I cleaned the carb, they looked in decent shape but I've attached some photos anyways. Maybe I should check them again now that the carb has been cleaned and retuned? <br /> <br />Hopefully some of you will have some insight and some things for me to try. Thanks a lot for all your help!</span> <br><img src="./uploads/867417.jpg" alt="Spark Plugs.jpg"> </td> </tr> </table></td> </tr> <tr> <td colspan="2" height="1" class="spaceRow"><img src="templates/ninja250rc/images/spacer.gif" alt="" width="1" height="1" /></td> </tr> </table>
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