xc 700 won't start - Snowmobile Forum: Your #1 Snowmobile Forum

gatorhator98 · 10-27-2009, 12:43 PM

On sunday i bought a 1998 xc 700. I met the guy there and we pulled it off the trailer and started it cold. It started first pull on full choke. That night when i went to start it it wanted about half throttle to get it started. Yesterday after it sat for a whole day it refused to start. The back end was raised too high and the whole sled had a pretty sharp angle. It is really flooded, with the plugs wet and fuel leaking out the exhaust ports. Would having it way too high cause such flooding. Also where are the plugs to drain the case. Thanks for any help.

onlypolaris · 10-27-2009, 02:53 PM

Could be as simple as turning the gas off when not in use. These sleds can flood themselves out by simply leaving the fuel on.

**RJ Gleason** · 10-27-2009, 03:27 PM

Drain plugs are under the exhaust manifold.
The needle valves on many of those did not seal right and if you left them on a stand overnight the base will fill with gas.
You have to either shut off the fuel valve every time you leave it for more than an hour, or fix the valve problem in the carb.

gatorhator98 · 10-27-2009, 04:59 PM

I had the carbs off all day today while i was at school. Then cleaned them when i got home. I put them back on and it started but only when it was at half throttle. Not any choke. I let it run for about 2 minutes then i looked down and there was a 3 and a half foot circle of gas and oil that came from the pipe. And gas and oil still dripped from under it. There are no leakes in lines etc. What would this be. Also are the drain plugs the 5/16 brass bolts at the very bottom of the crank case?

**BC_Dan** · 10-27-2009, 06:47 PM

Most likely, the inlet needle/seat in the carb was sticking open, allowing fuel to flow into the crankcase. As you cranked the sled to get it running, you pumped the fuel from the crankcase through the cylinder and into the exhaust. You are lucky. Sometimes when that happens, the fuel in the pipe/can sparks and blows things up big time.

Drain the case using the small plugs below the exhaust manifold as RJ suggests. Then pull the pipe/can and drain any remaining fuel from the pipe and can before you try to start it again. Make sure you start it outside with plenty of adaquate ventillation, sleds burn really well. (trust me on that one)

If you still have problems, replace the inlet needle/seats (viton tipped ones are less prone to sticking open). If that does not solve the problem, you may also have a hole in the fuel pump diaphram allowing fuel to enter the crankcase through the fuel pump impulse line.

gatorhator98 · 10-27-2009, 11:21 PM

Thanks alot that is a big help don't want my first sled to blow up.

gatorhator98 · 10-27-2009, 11:23 PM

K thanks. so once i got the carbs all lubed up it should work. Also why after i cleaned the carbs i still had to hold the half throttle. When i started it for the first time i put it on full choke and it fired right up?

**BC_Dan** · 10-27-2009, 11:59 PM

Most likely, if you have to hold the throttle open, the starting mixture is too rich. You could have a choke sticking open or the air screw may not be adjusted properly. One turn out usually is a good spot for the air screws. Make sure the choke lever is not tight, there should be about 1/8" freeplay from the choke lever to the lever nut.

gatorhator98 · 10-28-2009, 01:18 PM

When i took apart the carb the main jet in one was broken off. Would this make it where i have to hold half throttle? Also does anyone know someplace on the internet to get a new drain plug for the crank. Dropped it under the engine can't find it.

**BC_Dan** · 10-28-2009, 02:05 PM

gatorhator98 · 10-28-2009, 08:00 PM

The top part of the jet was was in the bowl and the rest of the threads i just unscrewed from the carb. Is that a reasoon it would be rich?

**BC_Dan** · 10-28-2009, 08:42 PM

That would definitely do it. The jet meters the fuel through the small, precise hole on the bottom of the jet; if your jet was broken and you were sucking gas through something the size of the ID of the threads, that would be MEGA rich. Sounds like you found your problem!

gatorhator98 · 10-29-2009, 12:30 PM

Ya that makes sense because the one that had the jet broken was the exhaust port that gas was leaking out of and the side the most gas came out of the crank. I ordered a new one and a new crank plug so hopefully that will fix it. Thanks for your help.