Spark plugs reading please

dunerider209
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Modesto, CA, USA
dunerider209
Edited Date/Time 1/6/2021 2:37pm
Cr250 running 50/50 sunoco standard and pump 91 at 32:1. Bike has a bog down low. Currently running lectron carb and typical bolt on parts. Bike randomly started having this bog issue, replaced servo and piston ring to no avail.
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Paw Paw 271
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Paw Paw 271 1/5/2021 1:37pm
1/5/2021 1:37pm
What compression are you showing when it is tested?
Have you done a leak test?

I see what looks like a bit of a rich condition, but I also see an oil condition.
The rich condition can be caused by low compression and the oil condition may be caused by a bad crank seal on the clutch side.

The photo also shows signs of may be running old fuel mix. Is you fuel mix fresh?

Have you done a chop test using a new spark plug?

Paw Paw
dunerider209
Profile picture for user dunerider209
Posts
35
Joined
11/20/2017
Location
Modesto, CA, USA
dunerider209 1/6/2021 2:37pm
1/6/2021 2:37pm
Paw Paw 271 wrote:
What compression are you showing when it is tested? Have you done a leak test? I see what looks like a bit of a rich condition...
What compression are you showing when it is tested?
Have you done a leak test?

I see what looks like a bit of a rich condition, but I also see an oil condition.
The rich condition can be caused by low compression and the oil condition may be caused by a bad crank seal on the clutch side.

The photo also shows signs of may be running old fuel mix. Is you fuel mix fresh?

Have you done a chop test using a new spark plug?

Paw Paw
Thanks for reply paw paw, the fuel mix is fresh and the ring has 5 hours on it. The last compression test was at 220 psi. I performed a leak test and found a massive air leak at the reed cage. The insulator is not sealing. I need to seal it up so I can then check the main seals which I suspect is the issue with the oil. Can I Honda bond around the insulator and put a paper gasket in between to solve the problem?

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