YM 1700 hard starting

[winston1]

Ditto Carey's post.

 

[SailorBob]

Did you try cracking the injectors while cranking..decomp lever release d? I recently had to do this in my YM1700 recently after I had run out of fuel

 

[Jtullis13]

Did you try cracking the injectors while cranking..decomp lever release d? I recently had to do this in my YM1700 recently after I had run out of fuel

Agreed. It really seams like a fuel problem that should be an easy fix.

 

[B man]

Big difference between using compression release and not using it. Lots of grey smoke, just no black and the glow coil flame does not seem to make a difference either. Have cracked the injector lines more than once. Guess I’ll do the head now. Grew up running JD so I thought this one would be a piece of cake��

 

[Jtullis13]

Well back to an earlier post in this thread, it probably is low compression since everything else seems to be in working order. Have done a compression test yet?

 

[California]

If all the reasonable alternatives have been explored, then another alternative could be - the injection pump is out of time. 360 degrees out would inject when the valves are open, for example. Was the pump ever removed?

 

[B man]

Rings have been replaced this past week.

 

[B man]

No, the pump has not been removed. I wonder if the fuel system needs to be cleaned, pump and injectors.

 

[careyo63]

Drain that tank and Napa has the Fuel Filter. Check the valves. Something tells me it's the fuel. The comment of being a big difference between the Decompression and Not makes me believe that. Now If it was mine I would remove the exhaust so you blow everything out esp. if there maybe water in the fuel. If it hits put it back. But blow it out with the air compressor. If you have Air and then your know its clear...

 

[B man]

Fuel is new, filter is new, exhaust is good no back pressure, just a head scratcher for sure.

 

[California]

Have you tried warming it with a heat gun or hair dryer into the intake long enough to make the head warm to the touch? Try that, with the compression release turned so the warm air can go clear through.

And put the charger on it, so the battery will be warm when you crank it, and to assist cranking.

 

[SailorBob]

I wonder if the decompression lever is not closing completely? If you have air fuel and compression it should fire. Did you replace the head gasket? Or has the head not been pulled?

 

[careyo63]

The decompression lever I thought of that to. New Rings so it's been pulled. Linkage backwards? The Decompression shaft should be pointing straight up. Coming out of the valve cover. Turn it to the left and downwards and it's on "Holding the Valves open" back straight up is off. I remember putting it on wrong myself checking my valve clearance..

 

[B man]

Will give it a try.

 

[B man]

New head gasket. Decompression linkage is correct. Just plain frustrating.

 

[kenmac]

Something sure isn't right. By your statement, you didn't remove anything to get it out of time
If it isn't out of time, and getting good compression, good fuel, then it should fire up !

 

[clemsonfor]

I agree with kenMac. If it started before and ran and you have not touched the pump then it should be fueling close enough to start, and probably run fine. Assuming you have the right parts and the gasket was installed undamaged and torqued right, with new fuel it will start??

You didnt re use a head gasket did you?

 

[B man]

No, used a new head gasket. Could the injectors need to be changed? Before I overhauled it, I could only get it to start with a shot of ether(I know not good for the two cylinders).

 

[winston1]

No, used a new head gasket. Could the injectors need to be changed? Before I overhauled it, I could only get it to start with a shot of ether(I know not good for the two cylinders).

You stated in post #36 you replaced the rings. Have you used starting fluid since then? These little engines won't tolerate it.

 

[kenmac]

I'm sure you paid attention to the ring gaps . that they were offset.
Just trying to come up with something here, as all you need is fuel, good compression, timing
You said you didn't fool with the timing, but you replaced rings and head gasket which are the two things that would keep it from having good compression