YM 1700 hard starting

[California]

... replaced rings and head gasket which are the two things that would keep it from having good compression

+ valve adjustment. Also compression release adjustment, on these engines.

 

[Jtullis13]

Good catch Kenmac and Winston....

 

[B man]

No ether since re-ringing.

 

[B man]

Ring gaps not aligned with each other. I知 thinking the injectors aren稚 atomizing the fuel, then again, there isn稚 a large quantity of fuel coming out when I crack the injectors.

 

[careyo63]

Your going to need to pull the Injectors so you can check the spray. Pull one out and take a piece of cardboard and see what the spray looks like. If any. And here a U-tube Video of what the spray should look like. And while you have them out I would check the compression. I have a feeling your going to find the problem.
Yanmar tractor injector spray check. - Bing video

 

[normde2001]

You also need good airflow, in and out. . . how sure? :confused3: No mention of air filter, and how sure are you of no back pressure? Only way is to remove exhaust and start tractor.

 

[careyo63]

I went over that! Told him to pull the Exhaust and clean it even. Then try it and if it hits put it back on. It won't even try to hit apparently and there isn't anything that hasn't been recommended to do.

 

[normde2001]

I went over that! Told him to pull the Exhaust and clean it even. Then try it and if it hits put it back on. It won't even try to hit apparently and there isn't anything that hasn't been recommended to do.

Yep, only re-read his posts, and no mention. . . As said, if everything mentioned has been tried it HAS to start:confused3:
. As my old cash register repair manuals used to say, if not fixed after going through the flow chart, do it again, there is no magic.

 

[careyo63]

That also why I said to pull the Inj.. We don't know the condition of them and if they show good then he's getting out the Comp. tester. Do inj go bad or get dirty and plugged up ? Sure so by his prev. post and used the either before the lower end I'm not ruling that out!!

 

[B man]

Good air flow in and out. Lower end is done also. Head looked good, valves doing what they should. Decamp working correctly. Got to check the injectors. Then I guess the pump would be next. Should be like new then. I’m like you guys, compression, air, (fuel?) should start. Will keep at it, kinda bullheaded about things.