120xr wont crank unless plugs are pulled

[Dsawyer16]

so i have a sugar sand with a 120xr, it started up fine after storage, but when i had the carbs rebuilt and put back on it wont crank over at all. i pulled the plugs and tried to crank it and it turns over fine but shoots an un-godly amount of gas/oil out of the bottom cylinder. rebuilt fuel pump, still does it....anyone have any ideas?!?! i wanna go out on the water!!!

 

[pnwboat]

Re: 120xr wont crank unless plugs are pulled

Sounds like maybe you're fuel pump diaphragm is busted.

 

[Dsawyer16]

Re: 120xr wont crank unless plugs are pulled

i just replaced it

 

[jerryjerry05]

Re: 120xr wont crank unless plugs are pulled

Batteries good???Do compression test.Then a starter check.Take it apart and check for burnt anything and loose/broken magnets.J

 

[Dsawyer16]

Re: 120xr wont crank unless plugs are pulled

battery is good, compression is great, and the starter is fine. it will crank right over with the plugs out but as soon as i put the plugs in it wont turn over at all

 

[jerryjerry05]

Re: 120xr wont crank unless plugs are pulled

What are the comp readings?Are the connections good.All the grounds right?

Bad comp on 1 cyl can do that.The bad starter will turn it over and when the plugs are out,plugs back in the comp makes it too hard to turn.J

 

[milehighboater]

Re: 120xr wont crank unless plugs are pulled

I don't know how much this can help, but I had a 350 chevy that was holding oil in two of the cylinders (the motor was stored on its side, full) and wouldn't turn over, like the motor was sized. the point is the oil was not able to compress like the air therefore locked up the motor until the plugs were removed and the cylinder was drained. Now I do not know your definition of "un-godly amount" but if it is enough the cylinder is filled and won?t allow compression then it might be a problem. Because it is the lower carb there is a possibility fuel is pouring though the lower carb and filling that lower cylinder and removing the plug is doing nothing more than relieving the pressure. If that is a possibility then make sure the float is set properly in that lower carb. I hope you can figure it out. good luck.

 

[Dsawyer16]

Re: 120xr wont crank unless plugs are pulled

thanks for all the replies guys!!! im gonna tear the lower carb apart tomorrow...is there any other way for that cylinder to get fuel/oil other than the carb?? i know there is a crazy fuel recirculation sytem on this thing...how should i go about emptying that bottom cylinder? and could there be somthing wring with the oil injection system causing it to inject too much oil?? sorry about all the questions im new to boat motors

 

[jerryjerry05]

Re: 120xr wont crank unless plugs are pulled

Sounds like the float is stuck on the bottom carb.When I read it before I didn't understand the problem.What year/model?J

 

[Dsawyer16]

Re: 120xr wont crank unless plugs are pulled

its a 1997 sugar sand mirage

 

[Dsawyer16]

Re: 120xr wont crank unless plugs are pulled

anyone else have any ideas?

 

[milehighboater]

Re: 120xr wont crank unless plugs are pulled

No what is the year and make of the motor? Is it the origional motor for the boat? If you can get the serial number off of the motor it would be very helpful, then we will know exactly which motor you have. It should be on the motor mount right next to the year.

 

[Dsawyer16]

Re: 120xr wont crank unless plugs are pulled

ohh its a 1996 120xr made by force dont have serial number right here but when i ordered the fuel pump rebuild kit they said it was a chrysler motor

 

[Dsawyer16]

Re: 120xr wont crank unless plugs are pulled

i put a new battery and cleaned all the terminals, cleaned the carbs, still wont turn over...when i try to crank it i can hear a kind of hissing noise like liquid is leaking into something...pulled the plugs and it turns over fine but is still shooting a lot of gas/oil out of only the bottom cylinder, other cylinders its just a mist

 

[Dsawyer16]

Re: 120xr wont crank unless plugs are pulled

could it be a bad starter?

 

[PaulO]

Re: 120xr wont crank unless plugs are pulled

Is it possible the starter solenoid is being shorted out when the plugs are in? Is there a short in the plug?

Are the fwd control wires connected properly on the terminal bar?

Do you have a manual?

 

[Dsawyer16]

Re: 120xr wont crank unless plugs are pulled

yea i have a manual...they only thing that gets me is a week before i had the carbs rebuilt it started fine no problems

 

[jaybirddog11]

Re: 120xr wont crank unless plugs are pulled

Make sure you have a good ground to your engine block. Clean all connections and firmly mount.

 

[Dsawyer16]

Re: 120xr wont crank unless plugs are pulled

where will the grounds to the block be?

 

[Dsawyer16]

Re: 120xr wont crank unless plugs are pulled

with the plugs in it will start to turn over but will only turn the engine about half a turn then nothing