Author Topic: A question about spark  (Read 2671 times)

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Torch654

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A question about spark
« on: October 15, 2005, 01:00:22 PM »
I am getting things in order and it is going well (in no small part thanks to all the info here). My bike starts and runs well, sounds great now :twisted: . But it seems the spark is a lot weaker when the bike is warm. What is the most likely problem? Thanks for any help.

Robert

Offline hughes

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A question about spark
« Reply #1 on: October 16, 2005, 06:53:11 AM »
Does the bike start when hot?? There is added resistance to elec. components when they are heated.
Open Class 2-Stroke Kawasaki KX500
Yamaha 2005 YZ250
Richard Hughes
Dirt Hammers - Online Off-Road Journal
hughes@dirthammers.com
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Torch654

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A question about spark
« Reply #2 on: October 16, 2005, 11:45:30 AM »
The bike is vary hard to start after it gets warmed up but starts good when cold. (I should have been more clear in my first post but I was going to work sorry) This led me to eyeball the spark and when it is cold is looks a lot weaker. I would also like to set up a folder in the gallery, I need an admin to do this for me, correct?

Offline hughes

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A question about spark
« Reply #3 on: October 16, 2005, 11:50:56 AM »
Have you tried jetting (pilot) and air mix screw adjustments :?: How old are the reeds :?: They may need to be inspected. Compression test on a warm engine might be in order. You can set up your own photo gallery.
Open Class 2-Stroke Kawasaki KX500
Yamaha 2005 YZ250
Richard Hughes
Dirt Hammers - Online Off-Road Journal
hughes@dirthammers.com
http://www.dirthammers.com

Torch654

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A question about spark
« Reply #4 on: October 16, 2005, 12:07:14 PM »
Quote from: hughes
Have you tried jetting (pilot) and air mix screw adjustments :?: How old are the reeds :?: They may need to be inspected. Compression test on a warm engine might be in order. You can set up your own photo gallery.


The jetting is to the chart here, I will finish dialing the air screw on my next day off (hard to do on a bike that is set up to not idel and is hard to start warm) The reeds are carbon and look new (Fresh top end on a new to me bike) and a through series of compression tests sounds like a very good idea. Thanks for the input. I will look these things over this week and post the results.

Offline hughes

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A question about spark
« Reply #5 on: October 16, 2005, 12:13:39 PM »
My bike was very hard to start when hot. After resetting float height and playing with the pilot and air screw it's one kick hot.
Open Class 2-Stroke Kawasaki KX500
Yamaha 2005 YZ250
Richard Hughes
Dirt Hammers - Online Off-Road Journal
hughes@dirthammers.com
http://www.dirthammers.com

Offline hughes

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A question about spark
« Reply #6 on: October 16, 2005, 12:16:49 PM »
I see you figured out the photo album.
Open Class 2-Stroke Kawasaki KX500
Yamaha 2005 YZ250
Richard Hughes
Dirt Hammers - Online Off-Road Journal
hughes@dirthammers.com
http://www.dirthammers.com

Torch654

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A question about spark
« Reply #7 on: October 16, 2005, 01:15:03 PM »
Thanks for the help :D

Torch654

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A question about spark
« Reply #8 on: October 21, 2005, 09:49:02 AM »
I just wanted to say thanks for the help (both to my sometimes foolish questions and the things I read using search). Bike starts first kick hot or cold :D still need to clean up the jetting on the needle as it is rich from 1\2 or so. but it runs and starts great,  :o .