98 WR400 won't kick start...HELP!
Posted August 07, 2008 - 04:22 PM
Last week it was acting a little temperamental about starting, but it did and ran good. So I went ahead and cleaned/oiled the air filter and changed the oil. Today when it would not start my first thought was spark plug, so I put a new one in (at the trail head ) but it still would not start. So I fiddled some more and then it started (with the kick starter). I let it run for a minute and then shut it off to put the seat back on. Then it would not start again. So we pull started it and took off up the trail. It never did start with the kick starter the rest of the day. It ran well, most of the day, but just before we got back to the truck it started faltering unless I kept the RPM's up.
So, now I am about to go and start testing the ignition system, but if anyone has any ideas I would sure like to hear them....
Posted August 07, 2008 - 04:34 PM
this is not a substitute for using feeler guages,but rather a quick diagnostic check.
if you got a little clearance on all the valves (thats good), then next thing to do is a compression check. do it hot and cold (trust me on this).
Posted August 08, 2008 - 04:03 AM
Posted August 08, 2008 - 09:57 AM
Sounds like it's ignition related - check your coil for good spark then test the stator.
+1 on this.
Posted August 08, 2008 - 01:44 PM
So, I am back to my original thought that it is a timing issue,which would point to the CDI, but I hate to buy something like that just on a hunch...
Posted August 08, 2008 - 08:50 PM
Posted August 08, 2008 - 10:40 PM
Posted August 09, 2008 - 09:12 AM
Is this possibly normal?
Posted August 10, 2008 - 06:14 AM
On the advise from some folks here at TT I re-visited the carb. The thought being the pilot circut which has some tight spots and isn't really easy to get to, had a little crud in it that needed to soften up in order to be blown out. I yanked off all the plastic bits and soaked it over night. I used a combination of gas/paint thinner and carb cleaner (from what I understand Yamaha makes a solution for this exact purpose) I reassembled it and sure enough she fired right up, after some basic carb adjustment everything was back to normal. I think if I had better understood how the pilot circut works in the first place I may have saved myself a lot of time and trouble. The pilot circut has everything to do with the way your bike is going to start and perform off idle. Besides a good thorough carb cleaning can't hurt.
Posted August 10, 2008 - 06:31 AM
Posted August 10, 2008 - 05:20 PM
So my last bright idea is timing which points to the CDI...
Thanks for all your thoughts, I will post when I finally do get it going again.
Posted August 11, 2008 - 06:05 AM
Posted August 11, 2008 - 06:23 AM
Posted August 11, 2008 - 10:15 PM
Posted August 13, 2008 - 03:59 PM
My best guess is that the carb was plugged after all. The exhaust valve the compression release is on is the one that I switched shims on, so maybe that changed where it liked to start on the compression release.....
Any way, thanks to everyone for your advice!
So I am having to re-learn the timing of starting it! I am going out trail riding tomorrow so I will see how it does. I think I am going to put my KLR in the trailer just in case!
Posted August 14, 2008 - 05:23 AM
Posted August 14, 2008 - 06:19 AM
Posted August 14, 2008 - 04:14 PM