Oil in the air box-SRX

A

averagesleder

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I searched but had no luck.
Sled 00 SRX700
So tonight I took the first 2 layers of the air box off. I noticed the second layer(part with tubes for air flow) was kinda dirty from oil residue. Once I removed this piece, the bottom of the air box had puddles of Yamalube in the bottom of it. I saw that the bottom of the air box had drain holes in it as well. So did the Manufacture know this would happen?

The sled has not been started since it was stored. The carbs and power valves were cleaned at the start of last season.
So why is there oil in the air box? Is this normal and how did it get there?

Thanks
Slightly puzzled Matt
 
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Funny when my dad got his 02 it was on yamalube and I never noticed, only noticed after he switched to amsoil interceptor. Having said that, it seams to be a nature of the beast thing with all the yamaha tripples. Never really understood why.
 
It's the design of the engine. When the piston is moving down to BDC, it creates a vacuum that draws the air/fuel in through the cyl. ports. When the piston reaches bottom & starts traveling upward, it actually pushes some of the air/fuel back out the ports-through the carbs- until the piston is covering those ports & what is left in the cyl. is what gets burned. If you ever owned an old sled with the carb about where the gas cap is on your srx, you would be familiar with this problem. When you get done riding & the front of your coat is full of gas & oil from being spit back at you, just hope it doesn't backfire. I have seen a snowmobile suit go up in flames from that. You will make a very quick dive into the snow.
 
LOL..I'd love to see that..snowmobile suit on fire while riding your sled.Would make a great video and a good night time ride warning anyone around you that you are coming through...lmao
 
ottawaair said:
It's the design of the engine. When the piston is moving down to BDC, it creates a vacuum that draws the air/fuel in through the cyl. ports. When the piston reaches bottom & starts traveling upward, it actually pushes some of the air/fuel back out the ports-through the carbs- until the piston is covering those ports & what is left in the cyl. is what gets burned. If you ever owned an old sled with the carb about where the gas cap is on your srx, you would be familiar with this problem. When you get done riding & the front of your coat is full of gas & oil from being spit back at you, just hope it doesn't backfire. I have seen a snowmobile suit go up in flames from that. You will make a very quick dive into the snow.
Click to expand...


LOL, I remember the one piece "SKi-Doo" suit my uncle had. He'd play with the carb while riding having the simulated-imitation woodgrain carb cover off and end up with the infamous round oil/fuel stain on the belly of his suit.

I have not seen any 2 stroke not produce some sort of spit back.

I believe a post from Daman recommended placing vacuum hose into the bottom drain holes to create a dam of sorts to keep oil from draining into the belly pan thus avoiding a mess.
 
Carbs mounted under the hood & not at your bellybutton was one of the best inovations to come to snowmobiles. I remember all you could hear was carb noise with the cover off. You definately won't be the first one anywhere with those units, on fire or not. It was a site to see, grown man in full blown panic.
 
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