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85 xr600 dies after warmup

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Hello. New to the site as a member but have been troubleshooting through y'all for a while. I have an 85 xr600 with fmf powerbomb and powercore 4 exhaust and jetted carbs. The rest is stock. The bike runs great for about 5 min or until it is warmed up after that it's slowly dies. I've ohmed the stator and that read good. When I ohmed the coil to the plug cap it was jumping like crazy and never above 7k. So I went and replaced the coil and it is still having the same issue. I'm not really sure what to do next other than get a new cdi and throw at it. Any suggestions or xr wisdom would be appreciated.

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Im confused by your question. I don't think this bike has a regulator. Unless you are talking about the little box under the seat.

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Update. I ran the bike until it got warm and tried ohming the stator while it was hot. I got a reading at about 350 oh. I have read here somewhere that a higher oh reading when warm is normal. Is that correct?

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Have you done any work to the bike recently, or did this just start happening out of the blue?

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 I put a full fmf exhaust and the proper jetting for the bike. It runs geat when cold when warm it dies. I will have the new Arrowhead cdi in today and see if that fixes it. If not it looks like I'm upgrading the stator

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No disrespect meant to your wrenching skills, but given that the carb has been altered and now there is a problem with the bike running, I would be really looking at the carb again with the possibility of fuel starvation.

I rebuilt my carb over the winter using a full rebuild kit and new jets (Dave's mod) and when I came to start the bike it would start easily when cold but would die if you gave it any gas. Lots of head-scratching later, I finally realized I had installed the Needle Set Jet wrong (installed from the top instead of sandwiched between the emulsion tube and the carb body). Ran great after fixing that dumb move.

Like I said, obvious things first. My money is on fuel at this point....

Edited by davenay67

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Thanks for the info I'll definitely look into it if the new cdi doesn't fix it. I never actually changed the needle just up jetted the mains and the pilot so that might be something I have to look at

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26 minutes ago, davenay67 said:

No disrespect meant to your wrenching skills, but given that the carb has been altered and now there is a problem with the bike running, I would be really looking at the carb again with the possibility of fuel starvation.

I rebuilt my carb over the winter using a full rebuild kit and new jets (Dave's mod) and when I came to start the bike it would start easily when cold but would die if you gave it any gas. Lots of head-scratching later, I finally realized I had installed the Needle Set Jet wrong (installed from the top instead of sandwiched between the emulsion tube and the carb body). Ran great after fixing that dumb move.

Like I said, obvious things first. My money is on fuel at this point....

Even if it's not the CDI, a spare working CDI is a good thing to have with BRP ownership. :)

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On 8/6/2017 at 9:50 AM, Nofatchicks said:

Im confused by your question. I don't think this bike has a regulator. Unless you are talking about the little box under the seat.

 

xr.png

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Well good news is the cdi fixed it 😀 now it's time to order a new uni filter, sprockets chain and rear tire and start shredding these trails.

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