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cobra0702

01 426 kickstart ceased

15 posts in this topic

Hello everyone, new to TT.

Just bought an 01 YZ426F and the kickstart is ceased up. I have not been able to take anything apart yet to inspect but I plan to do so when I get home. I'm just looking to see if anyone can provide me with some insight and if this is a common issue. Hopefully it's nothing too major and can get it running soon.

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This can be anything from a seized crank to a jammed up starter gear.  Exploratory surgery is required.

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Seized? Or the crazy compression? Did you try kicking it with the decompression lever?

I did try pulling the decompression level and it felt like it was working. Could I also try removing the spark plug?

This can be anything from a seized crank to a jammed up starter gear. Exploratory surgery is required.

That's what I figured I was going to need to do

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OK, wait.

 

You can turn it over with the compression release pulled?  Then nothing mechanical is frozen up.  You cannot expect to be able to kick a healthy YZ426 through its compression stroke without assistance, thus the decomp lever.  The correct procedure is to push (not kick) the starter down until the engine stops against compression.  Hold the starter there, pull the compression release and push the starter down about 1 to 1 1/2" farther and stop.  Release the compression lever, return the starter to the top and kick through the full stroke forcefully but smoothly. 

 

Watch: http://api.viglink.com/api/click?format=go&jsonp=vglnk_145339254599111&key=fd4d0c8927dbf2331e83bbda32ac7c21&libId=ijogctul010004is000DL1j6kbizcw0vhs&loc=http%3A%2F%2Fwww.thumpertalk.com%2Ftopic%2F378677-common-threads-look-here-1st-mods-maintenance-common-issues-and-faqs%2F&v=1&out=http%3A%2F%2Fwww.yamaha-motor.com%2Fsport%2F4stroke_vid%2F4_stroke_vid_a.mpg&title=Common%20Threads%3A%20Look%20here%201st!%20Mods%2C%20Maintenance%2C%20Common%20Issues%20and%20FAQ%27s%20-%20YZ%20400%2F426%2F450%20-%20ThumperTalk&txt=http%3A%2F%2Fwww.yamaha-mo...troke_vid_a.mpg

 

http://api.viglink.com/api/click?format=go&jsonp=vglnk_145339256377412&key=fd4d0c8927dbf2331e83bbda32ac7c21&libId=ijogctul010004is000DL1j6kbizcw0vhs&loc=http%3A%2F%2Fwww.thumpertalk.com%2Ftopic%2F378677-common-threads-look-here-1st-mods-maintenance-common-issues-and-faqs%2F&v=1&out=http%3A%2F%2Fwww.yamaha-motor.com%2Fsport%2F4stroke_vid%2F4_stroke_vid_b.mpg&title=Common%20Threads%3A%20Look%20here%201st!%20Mods%2C%20Maintenance%2C%20Common%20Issues%20and%20FAQ%27s%20-%20YZ%20400%2F426%2F450%20-%20ThumperTalk&txt=http%3A%2F%2Fwww.yamaha-mo...troke_vid_b.mpg

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OK, wait.

You can turn it over with the compression release pulled? Then nothing mechanical is frozen up. You cannot expect to be able to kick a healthy YZ426 through its compression stroke without assistance, thus the decomp lever. The correct procedure is to push (not kick) the starter down until the engine stops against compression. Hold the starter there, pull the compression release and push the starter down about 1 to 1 1/2" farther and stop. Release the compression lever, return the starter to the top and kick through the full stroke forcefully but smoothly.

Watch: http://api.viglink.com/api/click?format=go&jsonp=vglnk_145339254599111&key=fd4d0c8927dbf2331e83bbda32ac7c21&libId=ijogctul010004is000DL1j6kbizcw0vhs&loc=http%3A%2F%2Fwww.thumpertalk.com%2Ftopic%2F378677-common-threads-look-here-1st-mods-maintenance-common-issues-and-faqs%2F&v=1&out=http%3A%2F%2Fwww.yamaha-motor.com%2Fsport%2F4stroke_vid%2F4_stroke_vid_a.mpg&title=Common%20Threads%3A%20Look%20here%201st!%20Mods%2C%20Maintenance%2C%20Common%20Issues%20and%20FAQ%27s%20-%20YZ%20400%2F426%2F450%20-%20ThumperTalk&txt=http%3A%2F%2Fwww.yamaha-mo...troke_vid_a.mpg

http://api.viglink.com/api/click?format=go&jsonp=vglnk_145339256377412&key=fd4d0c8927dbf2331e83bbda32ac7c21&libId=ijogctul010004is000DL1j6kbizcw0vhs&loc=http%3A%2F%2Fwww.thumpertalk.com%2Ftopic%2F378677-common-threads-look-here-1st-mods-maintenance-common-issues-and-faqs%2F&v=1&out=http%3A%2F%2Fwww.yamaha-motor.com%2Fsport%2F4stroke_vid%2F4_stroke_vid_b.mpg&title=Common%20Threads%3A%20Look%20here%201st!%20Mods%2C%20Maintenance%2C%20Common%20Issues%20and%20FAQ%27s%20-%20YZ%20400%2F426%2F450%20-%20ThumperTalk&txt=http%3A%2F%2Fwww.yamaha-mo...troke_vid_b.mpg

No it did not fully kick it's still seized with the level pulled but I was saying that it felt like the level is working Edited by cobra0702

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Previous owner just told me he fired it up one day and when it was warming up it started sputtering and shut off, then would not budge when kicked

Edited by cobra0702

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Okay I just figured out that the bike will not move in gear with the clutch pulled in. It will only roll in neutral. Does this mean the issue is located in the transmission?

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It's pretty typical for the bike to hard to move in gear when not running, so I doubt it.  The crank is a $400 item, and if it need or the trans replacement, the entire engine must be disassembled.

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So I took the top end off and the cam chain is extremely tight, does anyone know how tight it is supposed to be? There is absolutely no play whatsoever. I am currently stuck with one of the stator plate torx bolts because it was rounded. Does anyone know what material the plate is made of that holds the stator? I might have to weld the torx socket to the bolt to get it out and I am unsure about heat transfer.

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Well, that's one approach.  The stator plate is aluminum.  If you're going to use an electric welder, shield the coils from the arc and be sure the stator harness is disconnected.  The plate itself should be alright as long as you don't arc to it.  

 

There are other ways..

 

The chain will always seem very tight when it's cold as long as the tensioner is working right. 

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So, how much did you pick this 426 up for?

Paid 700 and other than not kicking it's in really good shape Edited by cobra0702

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