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Had this 450es 2000 3 days now. Couldn’t get the oil dipstick to unscrew. Was riding grandbabies this evening and it kinda felt like it was missing or fuel. Then went dead. Gas tank gauge showed empty. Put about gallon and a half of gas in it. Wouldn’t start, pulled it up the street to house. Took air breather element out and found gas/oil in the plastic breather housing. Used big channel lock pliers on the dipstick and got it to moving. Unscrewed it and gas/oil came running out. Drained the oil and got one gallon and about a half pint to come out. What caused this. Do I need or “HAVE TO”always turn the fuel off when not running. Kinda believe fuel was in crankcase when I bought it. I rode around very briefly on it when I bought it. Got it on my trailer and loaded. The next day while still on the trailer I tried to unscrew the dipstick then and it wouldn’t budge. Today when I did get the dipstick out the o- ring was distorted and blowed out on one side. I am changing the oil and the filter, before starting the engine again what else should I do or examine? This is my first four wheeler ever alsoand it is full time four wheel drive. Steers very hard while trying to turn around at the intersection on my street. Is this normal? If so I dislike that enormously. Are all full time four wheel drives like that? This bike I bought has only one owner, never used in water or abused, everything works and looks excellent. Help with ideas. Do I need a carburetor rebuild or just alwaysturn fuel off. If Ineed a rebuild do I buy a rebuild kit from Honda or who?
 

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Carb needs attention, it's overflowing when it's parked, and most likely really rich when it's running. Stuck float is my first guess, but the overflow tube inside has a habit of cracking. When you get the float out, shake it to see if there's gas inside it. Also, the smallest bit of crud can hold the float valve open.


I get most of my parts from ebay.


With the oil caps, I only turn them until snug. Any tighter and they'll stick every time.
 

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What MR said, fix the carb! Fuel does not lubricate very well! The fuel is swelling your oil dipstick. I would buy a carb kit that has the floats and needle/seat. I’ve always used 2wheel drive on pavement. The front tires are fighting each other when turning on pavement in 4X4 mode...
 

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Pipercub the 2000 450 is full time four wheel drive though. Seems too hard to steer even in the back yard. I raised the front end with a jack and the handlebars turned very easily with tires off the ground.
 

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Moccasin Ranger, my overflow tube is doubled up and tie strapped. The owner had bought the little one way valve that goes on the end of the overflow tube. He gave it to me when I purchased the bike. He had just not installed. Am going to change the oil and filter and disassemble the carburetor today. If I feel it’s necessary I will buy a new needle and seat. Have to go to the Honda shop anyway to buy a new O-ring for the dipstick and oil filter. What weight oil do the 450’s require? Where is the overflow tube inside at specifically. You say they have a habit of cracking. Do you have a picture showing this? Been away from 3-&4-wheelers a long time now.
 

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It will look similar to the one below, this is a trx450r. The long brass tube sticking up from the bottom of the bowl. I found some drawings but this pic shows it better. Disregard the red pointer.



 

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Yep, stuck float, and the overflow tube (brass tube sticking up in MR's pic) must be stopped up, so when the carb filled up with gas, instead of it running out of the overflow tube and onto the ground, it filled up your crankcase with gas.


So take the carb off, clean it, put a Shindy carb kit in it, and put it back together. That SHOULD fix your leaky carb. Make sure the overflow is clear, and if the float sticks again you'll get a tell-tale puddle of gas on the ground under the wheeler instead of a crankcase full of gas.


It will not steer easily being a full time 4wd machine. You can buy a Wide Open 424 disconnect for it, which replaces your factory front driveshaft with a cable operated selectable front driveshaft, and allows you to put the machine in 2wd.


You can also swap in an 02-04 front diff, which has an electric actuator in it. That will require the 02-04 front diff, front driveshaft (which will have to be shortened about an inch), and a switch, which will have to be wired.


Either way you will have a MUCH easier to ride machine. While you're at it, you might look at adding disc brakes up front. You can either buy a conversion, or get knuckles, hubs/rotors, and calipers from an 05-11 Foreman, 05-14 Rubicon, or 06-19 Rincon and put them on there.


The 450's are the last of the really bulletproof Hondas IMO. They lack some creature comforts that the newer ones have, but you can add creature comforts to a 450, and once you do you will have a really tough bike.
 

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Jeepwm69 thanks so much for your input. What oil is recommended for the 450es, thank-you
I run Rotella 15W40 T4 (white jug) or Rotella T6 5W40 (blue jug). Look on the specs on the bottle and look for "JASO MA" which means it is wet clutch approved. The Rotella T5 blend does NOT have JASO MA on it so I wouldn't risk using that one, even though if I had to guess it also meets the specs.


Honda has their GN4, Valvoline makes ATV/Motorcycle 10W40, and Mobil makes the 4T. All are fine. Just look for a 40 weight oil that has JASO MA on the bottle somewhere.
 

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Thanks to all you guys who helped me with my post. The outcome was great. Rebuilt the carb., emptied all the old gas and cleaned the tank. Changed the oil and filter. Started right up, no leaking carb., no smoking exhaust, engine sounds quite. Now to accept the hard steering or change it. Checked air pressure in tires today. Front had 3 psi, rear had 4psi.

Jeepwm69 thank-you for all the info about the front end changes. I will read up more on all your info.
 

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You can air the front tires up quite a bit and it will help with steering.


I just build a 300 for my daughter with a 424 switchout. They're pricey but if you're going to keep the wheeler for the long term, and you ride a lot on hard pack/trails, the 424 is definitely worth it.
 

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I did exactly what Jeep mentioned, installing a newer front diff which is amazing. I have a 94 TRX300FW which is full time 4x4 and didn't want another one and going to put a 424 kit on it in the near future. You'll need the throttle off the same bike you get the diff from as it has the switch built in to go from 2x4 to 4x4, then add a light that will come on when in 4x4 so you can see at a glance that it is actually in 4x4. It's an excellent upgrade, you'll be glad you did it. Also, fuel isn't a lubricant, so I would definitely put fresh oil and after in her, run it a bit then change it out again. I'd actually do that a couple times before you put a lot of time on her. There are several expensive bearings inside the cases that stay in an oil bath and get lubricated when running. As you run it with diluted oil, it will obviously strip the lubricating properties of the oil and possibly burn a bearing. Oil and a 6 buck filter is way cheaper than having to pull a motor and bust it open to replace about 400 bucks worth of bearings, plus whatever damage, if any, is caused to the transmission gears, shift forks and things on that side as well. It's a viscous cycle lol. Just a little food for thought from someone who's been there, done that. Glad to hear the outcome on the carb rebuild, that's great! There's some very knowledge guys on here and years of experience and love to help so don't ever think you have a dumb question at all. Most of us didn't know much about em but knew we couldn't afford to have someone else work on out machines and started wrenching and learning on the fly. I'm still learning every day and lean on these ol boys when I need to and they jump right in with past experience and is a huge help! And for future reference, Shindy is the best aftermarket carb kit to use and they come with everything you need, and I mean everything but a new float, well worth it and a quality kit that will save ya few bucks without sacrificing anything.
 

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I look at full-time 4wd like this. It's harder to steer but usually goes where you point it without using body english. It also gives you well defined deltoid and trapezious muscles. :D
 
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