Homer1
Well-Known Member
- Joined
- Jul 25, 2015
- Threads
- 19
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- 170
I have been working on an older Command CV740 27 hp engine on a ZTR trying to figure out what's wrong with it. It ran last year but with a little valve noise. Has been maintained as far as I know. This year, it turns over, but won't start. I have already been through a few checks to try and shed some light on it, but I keep coming up blank.
1. Checked and cleaned carb (did not open the accelerator as I don't have a new seal on hand) All jets and flow seem ok.
2. Checked operation of the fuel shut off solenoid, works correctly.
3. Checked fuel pulse pump, working.
4. Checked for spark, and changed plugs, both cylinders, good.
5. Tried to check for compression but came up blank, not sure if I am doing it correctly honestly (using a screw in gauge and turning over a few times) results in zero both cylinders.
6. Checked rocker movement, one valve seems to open half the rate of the other left side when turning engine over by hand.
7. Battery voitage good, 12.4
8. Fuses good (only 2 I can find on entire mower)
Haven't tried starter fluid yet.
I'm not sure if it's something I'm missing or something electrical. The safety sensors all appear to be working, as the engine cranks, and I assume it shouldn't even do that if one of them was not working.
Any suggestions?
Thanks.
1. Checked and cleaned carb (did not open the accelerator as I don't have a new seal on hand) All jets and flow seem ok.
2. Checked operation of the fuel shut off solenoid, works correctly.
3. Checked fuel pulse pump, working.
4. Checked for spark, and changed plugs, both cylinders, good.
5. Tried to check for compression but came up blank, not sure if I am doing it correctly honestly (using a screw in gauge and turning over a few times) results in zero both cylinders.
6. Checked rocker movement, one valve seems to open half the rate of the other left side when turning engine over by hand.
7. Battery voitage good, 12.4
8. Fuses good (only 2 I can find on entire mower)
Haven't tried starter fluid yet.
I'm not sure if it's something I'm missing or something electrical. The safety sensors all appear to be working, as the engine cranks, and I assume it shouldn't even do that if one of them was not working.
Any suggestions?
Thanks.