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Old 05-26-2011, 09:17 PM   #1 (permalink)
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Honda 450 Foreman backfiring, no power but idles fine

Begging for help at this point... I have a 2002 Honda Foreman 450. Was running just fine through the farm, all at once lost all power and began backfiring through the carb. Funny thing is it idles fine just like its supposed to, but when you push the throttle, it starts backfiring and sounds like it chokes to death and will kill the engine if you dont let off quickly. Took off the lid to the air box and there was what appeared to be a puddle of oil. (Have made no recent adjustments or service work)

Now, I've changed plug, plug wire & coil, oil change and filter, cleaned breather foam and replaced air cleaner. Took jets out of carb and cleaned them thoroughly. No obvious debris in carb or jets. Cleaned and checked all vent tubes. Checked fuel flow and appears to be fine. Put it all back together and problem is EXACTLY the same. Idles perfectly, but when you hit the throttle it backfires through the carb into air box and chokes to death. I dont know what else to do. Please help! Thanks
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Old 05-26-2011, 09:33 PM   #2 (permalink)
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im not an expert, it may have a timing issue or something to due with valves if its backfiring thru carb, your intake valves open when its on compression stroke,
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Old 05-27-2011, 12:48 AM   #3 (permalink)
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Welcome to the forums,and give us some more background like,how much oil was in your airbox? Was it fresh,and hot? What did you do in the minute just prior to this happening:jumping,bouncing along,idling.....deep bottomless mudbogging,....??? Any strange noises at all from your engine once it lost power???
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Old 05-27-2011, 05:18 AM   #4 (permalink)
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Thanks for the replies and welcome! Wish I had known this site existed ages ago.

We use the bike mostly as a farm vehicle (to feed, spray round up, just get from one point to another, etc.). I was on the farm next door riding home when it started. Was moving along in 4th gear at a pretty good clip down a long flat gravel road. Never mudbog it. It was running smooth and fine and with the throttle open it was almost like you had thrown the kill switch. It began to backfire repeatedly through the carb and sounded like it choked to death. Never saw any smoke of any kind. It jerked a little every time it backfired. It died, and I immediately cranked it back. It idled and would barely limp forward in first gear at a crawling pace. When you let off the throttle, it would and still idles perfectly as it always has. Oil in the airbox was about a small pill bottle full. Oil was warm, but not hot. Very thin, could have had some gas mixed with it. Breather and air cleaner were saturated in oil. When I removed the air cleaner, the back side of interior of the carb (airbox side of the main needle?) was black with a film of what looked like oil. There are no mods to the bike and factory all the way around without ever any issue. Only routine maintenance ever done, but fair to say it was overdue for an oil change and plug change (which have been done now).

I also have a 2004 model of the exact same bike. I brought the other bike over and changed plugs and wire (with coil) thinking the plug was fouled. Nothing changed. I have since put in a new plug. The bike has never been apart, but reluctantly took out the carb, took it apart and cleaned all jets thoroughly with carb cleaner, a small wire and blew it out with air pressure. It idles fine now, and doesnt appear to be putting any new oil in the box while idling. When you ease into the throttle it starts getting choppy then backfiring and will die if you dont let off. If you do let off, it idles just fine.

Hope this helps! Thanks guys!
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Old 07-11-2011, 06:25 PM   #5 (permalink)
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I have a 2001 Honda Foreman ES that started doing the same thing today (no oil in air chamber). Idles fine, sputters and dies if you give it gas. Gas is flowing fine to carb.
What did you do to fix?
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Old 07-11-2011, 07:03 PM   #6 (permalink)
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Voltage regulator ??? I had this same issue about a year ago.
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Old 07-11-2011, 08:33 PM   #7 (permalink)
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I think you may have a carb issue like trash in the jets,sticking float problem perhaps...I'd thoroughly clean the carb,petcock,add an inline fuel filter then see what it does...
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Old 11-25-2011, 08:59 PM   #8 (permalink)
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Hey,

I have the same problem with my quad. I have cleaned the carb twice and the quad idles but hit the throttle and it dies.

What gives?
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Old 11-25-2011, 09:20 PM   #9 (permalink)
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X's 2 on the Carb cleaning. I would also install a in line fuel filter while your at it.
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Old 11-25-2011, 09:23 PM   #10 (permalink)
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Could also be a valve issue, but I don't think it would idle fine if your timing was off or had a warped valve.
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