rebuilt j 17 engine won't start

willie1981 · 10-30-2014, 06:22 PM

Guys, I have a g1 with the j 17 engine that has been rebuilt from top to bottom. It ran good and one day it quit and not start again so I took it off and sent it to be rebuilt. I installed the engine today and it will not start. I marked the timing plate before I took the engine apart and put it back the same way it was removed. I have not used a volt meter but I took the plug out and layer is on the engine and it I'd firing. I put a new fuel pump on it and it still would do nothing so I hook up a small tank and started gravity feeding. Still nothing. It does back fire now and then and seems like it is going to fire up. I have cleaned the carburetor And it seems to be in good condition. Any help and advice would be greatly appreciated. Thanks

1989Marathon · 10-30-2014, 06:27 PM

Here's a quick test.
Remove the spark plug and spray about 2 teaspoons of fuel into the hole. Install the plug and see if it fires. That will send us in the right direction.

willie1981 · 10-30-2014, 06:55 PM

Ok, and thank you sir. I will try this first thing in the am. Sometimes it seems like it is trying so hard to start and then it just backfires and becomes dead again.

willie1981 · 10-31-2014, 08:58 AM

Ok, so I installed a new spark plug, and did the test with approximately 2 teaspoons of gas this morning and still nothing. It did seem like it wanted to start at times, but the rpm's never got above an idle. For what it's worth, the exhaust is getting hot when I am cranking the engine. There seems to be good flow coming out of the tail pipe.

1989Marathon · 10-31-2014, 06:42 PM

It's not running and the muffler is getting hot?

willie1981 · 10-31-2014, 07:31 PM

I think it is firing up now but the engine will not rev up no more than an idle. I took the carburetor apart and ensured that the jets are clean, and the float is adjusted properly. As I said, I have an auxillary tank gravity feeding gas to the carburetor, and I have the vacuum line plugged off. I pulled the magneto and clutch to double check the crank seals and they looked to be ok. I am clueless at this point.

1989Marathon · 10-31-2014, 07:34 PM

Are you sure the choke is open and the throttle plate is opening when you press the pedal? Also, is the exhaust butterfly opening when you press the pedal?

willie1981 · 10-31-2014, 07:54 PM

Im positive that the choke is open and the throttle plate is opening but I am unsure about the exaust. I do know that there is a lot of flow coming out of the exaust pipe. I did notice that the spark plug was wet the last time I pulled it out. Is it possibe that it's not firing good enough?

1989Marathon · 10-31-2014, 08:01 PM

It is more likely that you have too much fuel going into the motor. Is the float level set correctly so it shuts off the fuel to the carb when the bowl is full?

willie1981 · 10-31-2014, 08:07 PM

When I adjusted the float I set it to where I could barely blow through fuel inlet when the float was hanging down. Does that sound right?

10-30-2014, 06:22 PM	#1
willie1981 Not Yet Wild Join Date: Sep 2013 Location: east,ky Posts: 23	rebuilt j 17 engine won't start Guys, I have a g1 with the j 17 engine that has been rebuilt from top to bottom. It ran good and one day it quit and not start again so I took it off and sent it to be rebuilt. I installed the engine today and it will not start. I marked the timing plate before I took the engine apart and put it back the same way it was removed. I have not used a volt meter but I took the plug out and layer is on the engine and it I'd firing. I put a new fuel pump on it and it still would do nothing so I hook up a small tank and started gravity feeding. Still nothing. It does back fire now and then and seems like it is going to fire up. I have cleaned the carburetor And it seems to be in good condition. Any help and advice would be greatly appreciated. Thanks

10-30-2014, 06:27 PM	#2
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: rebuilt j 17 engine won't start Here's a quick test. Remove the spark plug and spray about 2 teaspoons of fuel into the hole. Install the plug and see if it fires. That will send us in the right direction.
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

10-30-2014, 06:55 PM	#3
willie1981 Not Yet Wild Join Date: Sep 2013 Location: east,ky Posts: 23	Re: rebuilt j 17 engine won't start Ok, and thank you sir. I will try this first thing in the am. Sometimes it seems like it is trying so hard to start and then it just backfires and becomes dead again.

10-31-2014, 08:58 AM	#4
willie1981 Not Yet Wild Join Date: Sep 2013 Location: east,ky Posts: 23	Re: rebuilt j 17 engine won't start Ok, so I installed a new spark plug, and did the test with approximately 2 teaspoons of gas this morning and still nothing. It did seem like it wanted to start at times, but the rpm's never got above an idle. For what it's worth, the exhaust is getting hot when I am cranking the engine. There seems to be good flow coming out of the tail pipe.

10-31-2014, 06:42 PM	#5
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: rebuilt j 17 engine won't start It's not running and the muffler is getting hot?
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

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10-31-2014, 07:31 PM	#6
willie1981 Not Yet Wild Join Date: Sep 2013 Location: east,ky Posts: 23	Re: rebuilt j 17 engine won't start I think it is firing up now but the engine will not rev up no more than an idle. I took the carburetor apart and ensured that the jets are clean, and the float is adjusted properly. As I said, I have an auxillary tank gravity feeding gas to the carburetor, and I have the vacuum line plugged off. I pulled the magneto and clutch to double check the crank seals and they looked to be ok. I am clueless at this point.

10-31-2014, 07:34 PM	#7
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: rebuilt j 17 engine won't start Are you sure the choke is open and the throttle plate is opening when you press the pedal? Also, is the exhaust butterfly opening when you press the pedal?
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

10-31-2014, 07:54 PM	#8
willie1981 Not Yet Wild Join Date: Sep 2013 Location: east,ky Posts: 23	Re: rebuilt j 17 engine won't start Im positive that the choke is open and the throttle plate is opening but I am unsure about the exaust. I do know that there is a lot of flow coming out of the exaust pipe. I did notice that the spark plug was wet the last time I pulled it out. Is it possibe that it's not firing good enough?

10-31-2014, 08:01 PM	#9
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: rebuilt j 17 engine won't start It is more likely that you have too much fuel going into the motor. Is the float level set correctly so it shuts off the fuel to the carb when the bowl is full?
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

10-31-2014, 08:07 PM	#10
willie1981 Not Yet Wild Join Date: Sep 2013 Location: east,ky Posts: 23	Re: rebuilt j 17 engine won't start When I adjusted the float I set it to where I could barely blow through fuel inlet when the float was hanging down. Does that sound right?

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