engine starts and runs, then dies and won't restart - Honda Foreman Forums : Rubicon, Rincon, Rancher and Recon Forum
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Old 05-16-2011, 10:46 PM   #1 (permalink)
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Default engine starts and runs, then dies and won't restart

Hi all, I'm new to this forum, and new to 4 wheelers. I recently bought a 04 Foreman 450. It would start real easy, but smoked like crazy. So I put a new piston and rings in, had the cylinder bored etc... Anyway, ever since I got it all back together, I can start it when it's cold ath the beginning of the day, and it will run fine for a few minutes, with no smoke or odd noises, then it will die, and I am not able to restart it untill the next day, after it sitting over night. I'm out of ideas

I've double checked that the fuel is on, and it flows well to the carb. the carb has been gone through and thoroughly cleaned, it's got a new spark plug, I've double checked the valves, and they are both at .006" I've tried a different coil, a different carb, different CDI (used)

I have no idea what else to do/check and hope you guys can point me in the right direction. Thanks for your help
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Old 05-16-2011, 11:03 PM   #2 (permalink)
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welcome to the forum
1st thing i would do is check the compression both hot and cold (see if it differs)
2ndi would makesure there is no restrision in the muffler
3rd id change the sparkplug (if cracked it can stop working when it gets hot it expans)
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Old 05-16-2011, 11:09 PM   #3 (permalink)
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Compression is at 148 cold, I will try to check it hot tommorrow.
I will check the muffler, however, it originally had a straight pipe on it (there when I bought it) and it did the same thing with it on there. It's got a used factory muffler on it now.
I have tried two different spark plugs, one came with the bike, the other brand new, no noticalbe cracks or deffects in either one, it has not run enought to color/discolor the new plug yet. Spark plug gap is set to .035 Also I've noticed that the plug is dry when I pull it out after it dies, I expected it to be wet, from attempting to start it, I thought it might have gotten flooded after cranking it for a little bit, but it was totally dry.
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Old 05-16-2011, 11:13 PM   #4 (permalink)
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will it fire if you spray starting fluid in the carb?
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Old 05-16-2011, 11:16 PM   #5 (permalink)
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it will "sputter" but not start
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Old 05-16-2011, 11:18 PM   #6 (permalink)
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but nothing without starting fluid
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Old 05-16-2011, 11:20 PM   #7 (permalink)
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if i push the primer on the carb ( I can hear it squirt) it will sputter also. But without doing that or spraying starter fluid, nothing.
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Old 05-16-2011, 11:26 PM   #8 (permalink)
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did you clean the jets realy good in carb it sounds like a fuel problem
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Old 05-16-2011, 11:33 PM   #9 (permalink)
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The carb was dissassembled and soaked in carb acid, and then thoroughly cleaned with aerosol carb cleaner, and then reassembled. I even tried a second carb, it was not soaked but was cleaned with aerosol carb cleaner.
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Old 05-16-2011, 11:39 PM   #10 (permalink)
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did you see if the carb boot is cracked or split
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