2008 BF 750 4x4i question

[#34 KX 250]

im a newbie when it comes to quads but i have 10+ years experience on bikes. Either way i have a question, why does my brute force keep dying when i go through water thats not even near my foot pegs in depth? i have seen many non-snorkeled quads going through seat deep water.

is the intake on my utility quad by my front diff or what?

[99prairie400]

Alright, Water-proofing.101

The limiting factor on any quad is only the lowest sealed thing that keeps the engine running. For a stock quad it's usually the ignition system. For a modified mud racer it's usually however tall the snorkel reaches above the rack. (search HB boys busco for an idea of how deep a quad can continue to run under water, the engine was still running at the beginning of the video, the driver just couldn't hit the throttle anymore so they had to winch it back out)

You're probably experiencing ignition system shorts from splashing water. The coil and wire end is usually sealed together but the spark plug boot is relatively exposed. It has a lot of voltage running down that wire and even a little bit of moisture will short the plug out. The way to water proof your ignition is to remove the spark plug boot, shoot a good healthy squeeze of di-electric grease into the boot, and re-install. The use of a small tie-strap to help hold the boot down around the spark plug a little better is personal preference and application specific. I have run my Bayou 400 across a pond with 8" of water over the handlebars without a tie-strap on the spark plug boot but if you have room for it, it's not a bad idea.

[SWBF]

Your air-intake is in front of the air box, right above the header pipe, steam could be the problem. All it takes is either water or steam vapors to get sucked in and you will stall.

[#34 KX 250]

Originally Posted by 99prairie400

Alright, Water-proofing.101

The limiting factor on any quad is only the lowest sealed thing that keeps the engine running. For a stock quad it's usually the ignition system. For a modified mud racer it's usually however tall the snorkel reaches above the rack. (search HB boys busco for an idea of how deep a quad can continue to run under water, the engine was still running at the beginning of the video, the driver just couldn't hit the throttle anymore so they had to winch it back out)

You're probably experiencing ignition system shorts from splashing water. The coil and wire end is usually sealed together but the spark plug boot is relatively exposed. It has a lot of voltage running down that wire and even a little bit of moisture will short the plug out. The way to water proof your ignition is to remove the spark plug boot, shoot a good healthy squeeze of di-electric grease into the boot, and re-install. The use of a small tie-strap to help hold the boot down around the spark plug a little better is personal preference and application specific. I have run my Bayou 400 across a pond with 8" of water over the handlebars without a tie-strap on the spark plug boot but if you have room for it, it's not a bad idea.

I found a healthy amount of water in my airbox and my air filter was pretty damp.

[99prairie400]

I'd say it wasn't steam and it wasn't your spark plug shorting out. You may want to think about snorkeling the beast. I'd hate to ruin an expensive monster like that by sucking up a little water.