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Crf100 cuts off after 45 minute ride
Posted: Fri Mar 05, 2021 8:41 am
by Mjleedle
Sons 2004 100f shuts off after 45-50 minutes of riding. Initially thinking it was flooding as letting it sit for 10-20 minutes it would restart. However, after fully rebuilding carb, double checking float, and watching his GoPro footage I’m leaning more toward electrical. It basically acts like the kill switch is being held because you can basically hear it stop firing and coast to a stop. I’m assuming the coil is going bad and over heating.
Is there a way to bench test the coil and CDI to see if one or both are bad? I hate throwing parts at problems without first knowing if they are bad or not.
Re: Crf100 cuts off after 45 minute ride
Posted: Fri Mar 05, 2021 12:44 pm
by JimDirt
What you can do is call the dealer (or go there) and see if they will give you the specs from the Service Manual or print you off the pages that show the test procedures and specs , as the Owners Manual will not have the specs you need to test the coil or anything else .... another item it also could be is the Stator , it can give the same symptoms .... , same goes for the CDI/ECU .... any one of them can work for a short period , then when they get hot , they shut down , but will work fine when cold , until they ultimately fail completely .... , but without buying a Service Manual , that would be your best and least expensive option
Re: Crf100 cuts off after 45 minute ride
Posted: Sun Mar 07, 2021 1:55 pm
by Mjleedle
What you can do is call the dealer (or go there) and see if they will give you the specs from the Service Manual or print you off the pages that show the test procedures and specs , as the Owners Manual will not have the specs you need to test the coil or anything else .... another item it also could be is the Stator , it can give the same symptoms .... , same goes for the CDI/ECU .... any one of them can work for a short period , then when they get hot , they shut down , but will work fine when cold , until they ultimately fail completely .... , but without buying a Service Manual , that would be your best and least expensive option
Thank you Jim, I’ll head over and ask. I have a service manual but refers to a CDI trouble shooting manual.
Re: Crf100 cuts off after 45 minute ride
Posted: Sun Mar 07, 2021 1:55 pm
by Mjleedle
What you can do is call the dealer (or go there) and see if they will give you the specs from the Service Manual or print you off the pages that show the test procedures and specs , as the Owners Manual will not have the specs you need to test the coil or anything else .... another item it also could be is the Stator , it can give the same symptoms .... , same goes for the CDI/ECU .... any one of them can work for a short period , then when they get hot , they shut down , but will work fine when cold , until they ultimately fail completely .... , but without buying a Service Manual , that would be your best and least expensive option
Thank you Jim, I’ll head over and ask. I have a service manual but refers to a CDI trouble shooting manual.
Re: Crf100 cuts off after 45 minute ride
Posted: Sun Mar 07, 2021 5:10 pm
by JimDirt
That is odd that the CDI testing is not part of the Factory Service Manual ... Maybe contact the dealer and see if they can print you a copy of the Supplement that has those specific tests ... and ask them why it is not part of the Factory Service Manual which is what their mechanics would use , so it "should" have everything ..
