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  #1  
Old 04-06-2018, 03:32 PM
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Default 1978 honda cr250

     

Just bought a couple months ago. Has fresh top end. New PWK carb. Rode it for 15 minutes on a practice track. It stopped running. Started it back up, rode back to truck. Would not start the rest of the day. Got home cleaned carb out with compressed air, drained gas tank for debris. Adjusted float, gas overflowing from carb. Re adjusted, stopped it. Getting really good blue spark. Now plug is dry, re adjust float still dry. Installed another brand new out of the box carb, still dry. A couple of times smoke has come out of spark plug hole after removing the plug. I am at a loss what to do , please help.
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Old 04-06-2018, 07:19 PM
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If you have already tried replacing the sparkplug, you could try removing the sparkplug and adding about a half oz. of gas directly in the cylinder. If it fires you have a fuel delivery problem. You will need to try this with a fresh sparkplug. If it will not fire, you will need to check the compression. Is the plug coming out dry after trying to start it?
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Old 04-06-2018, 09:24 PM
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I tried a couple of times, some gas down plug hole. Still would not start. Towed behind truck at good speed to bump start. It started, but I had to keep speed up or it would want to die. Wouldn't start pushing it down a hill & bump starting it. Starting to think it's electrical at low speed.

---------- Post added at 08:24 PM ---------- Previous post was at 08:21 PM ----------

Yes, spark plug is always coming out dry when I try to kick start it. Float adjustment again ?
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Old 04-06-2018, 11:38 PM
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Check the compression.

Paw Paw
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Old 04-07-2018, 11:06 AM
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Compression test was 60 psi
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Old 04-07-2018, 01:43 PM
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Quote:
Originally Posted by lendog 46 View Post
Compression test was 60 psi
I can't believe it actually cranked with only 60 psi!
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Old 04-07-2018, 02:19 PM
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Default Low compression

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Originally Posted by lendog 46 View Post
Compression test was 60 psi
With that low a compression number a tear down is in order. I would suggest that a lean fuel condition raised the heat level and thus the ring has stuck in the piston. Pull the exhaust pipe and look in the exhaust port at the piston. You may see scratches on the piston.

Paw Paw
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Old 04-07-2018, 02:30 PM
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Ok we'll do that. Thank you for your imput.
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