Hey matt!

It doesn't matter how high your intake is. If you EVER put it "under" then it will not run. If the air intake is underwater it has no way to get air. Also I would only advise you to put a snorkel on your 300 if, and only if, you intend to do a lot of mud riding in deep water areas. I say this because the snorkel does get in the way sometimes during regular trail riding, but in my case it's worth the trade off.

"LOCK 'EM AND LEAVE 'EM!!!"
SwampMonster

1999 Foreman 450S Locked, Lifted, Vamped, Snorkeled, and did I mention widened? (wheel spacers)

 

This may sound stupid, but I may just snorkel my exhaust pipe.In many cases, it goes under way before my air intake does! Most of the time in deep water the rear tends to dip down. What do you think about just the rear exhaust breather?

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Matt Sibley

1999 Honda 300 4x4 Vampires, Lift Kit, 2500lb WARN winch

 

hey matt, swamp is right about the breather, like i said on my earlier post all the serious 4x4s have them. another thing is there is no water out there, just soupy mud. this is a plus because your qaud, hondas especially, float better than they normally do. but if swamp says to get one then get one. im
sure he knows more about hondas than i do. and the talepipe snorkel isnt a bad idea. alot of quads have them, and the plus side to that is you can come of the gas without having to worry about your quad dying, but the ones that dont do ok just as long as they stay on the gas. i do plan on having one by marengo.

LATER

 

So should I weld on a pipe, or is there another option to snorkel the rear exhaust. I'm going to get my bearings fixed next week, I hope, my front wheels are rattling bad now. Then I'll look into building the breather a little more. I was really hoping to have the high perf. kit on soon, but now I have to spend over a hundred bucks on bearings. That sucks huh? Also, today for the first time, I let my vamps down to six psi in each tire(rear) and 3 psi (front) Major difference in the mud, it actually helps you stay more on top rather than digging straight down. Now I have around 10 in each tire. I rode down this creek, very little water with gumbo mud, when I had the tires with less psi, I seemed to stay on top of the mud and keep on going, also able to use second gear. When I went back with around 10 psi, I sunk down more and was forced to use first gear. Just a little experiment I did today. Thought I'd let you guys know. However when in water, keep the vamps aired up to about 15-20. They'll make that thing float like a boat(without you on it)

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Matt Sibley

1999 Honda 300 4x4 Vampires, Lift Kit, 2500lb WARN winch

 

Matt....u can go to a local muffler shop in your area to have your tailpipe extended...i had mine done at a place here in Tyler and they only charged me $15

 

the bear's right matt, your local muffler shop is probably your best bet. there cheap and they can bend your pipe extension however you want it. heres something to think about too, when they weld it on and it 90's up pass your rack a ft. or two, however high you want it, dont let the muffler shop weld the upper part to your rack. if you want to take it off later you'll either have to grind it or cut it with a torch. either way your chancing popping a hole in the thin-walled tubing your rack is made out of. my advise is to U-bolt it on there. your muffler shop should also have this too.

bigbear you coming to marengo?

LATER

 

Matt,
One other thing to consider when they build your "highwater" pipe..
Make SURE they bend it 90 degrees BACK. Three reasons; One is that if the pipe end straight up, the exhaust pulse with leave you with a ringing ear after awhile.
Another thing is taht when it rains, it'll fill your muffler full of water.
Third, and most improtant, the air coming by your body as you drive along with create a "void" at your back and swirl exhaust fumes( carbon monoxide) right up behind you and you will inhale some of it whether you know it or not... We didn't realize it until the Big BEar we had it on started running rich... We could smell it stronger.
They are great to have though.. Do that, put some RTV silicone around the inside of your sparkplug boot, and go play submarine...
A basketball in the front end with 15 p.s.i. if air in it will increase the fun factor and allow you to ride water wheelies...

See ya'll at Marengo....

 

Thanks guys. It doesnt sound very difficult or expensive so I think I might go get it done real soon. I was also looking at the air intake today. It seems pretty easy to get to with the removal of the gas tank. I may start working on it soon too. This is my main question though, what else needs to be rerouted to a higher point along with the air intake and where do I find these parts???

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Matt Sibley

1999 Honda 300 4x4 Vampires, Lift Kit, 2500lb WARN winch

 

oh yea, one more thing, with just the rear exhaust extension will I have to adjust the needle or whatever on the carb? What about with the air intake breather?

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Matt Sibley

1999 Honda 300 4x4 Vampires, Lift Kit, 2500lb WARN winch

 

Hey matt!

With any airflow modifications done on your quad (air intake/exhaust) you will probably need to make some adjustments in the carb. Of course this may not be necessary if you are some kind of super engineer and design your system to exactly duplicate your stock system. I'm no carb expert by any means. And I hope this info is correct because it worked for me (please correct me if I'm wrong guys), but you can change your needle setting to accomodate for the change in air flow through your modified air intake. This will not give you more power though. You are only trying to get back to the original air/fuel mixture that your stock system had. Now if you wanted to get the extra power benefit out of an increased air intake capacity you would then need to start re-jetting the carb to allow sufficient fuel to mix with the added air.

Another topic you brought up was what else to extend for deep water. Well, on the Honda you need to run an extension off of the vent for the carb, the front and rear brakes, and also the front and rear differentials. On my 450 all of those (except the carb) were vented to the frame right under the handlebars. You can easily extend them with 1/4" nylon tubing. Also be sure to leave a "service loop" in the small tubing so that you can take it loose and drain any moisture that gets in the tube before it gets down into the other parts.

I hope this helped.

"LOCK 'EM AND LEAVE 'EM!!!"
SwampMonster

1999 Foreman 450S Locked, Lifted, Vamped, Snorkeled, and did I mention widened? (wheel spacers)