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09-01-2021, 09:09 AM | #21 |
Vintage tech
Join Date: Sep 2009
Location: South
Posts: 3,216
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Re: CT Rebuild 375 (295) Robin Engine Won’t Run
With this spark tester make sure you leave one plug wire on spark plug when testing. If it fires across this tester then you don't have a spark problem which then leaves making sure your plugs are not gas fouled.
I didn't realize you had messed with the carburetor while waiting on engine. Let us know the results of spark then we can go from there. |
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09-01-2021, 09:28 AM | #22 | |
Not Yet Wild
Join Date: May 2019
Posts: 48
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Re: CT Rebuild 375 (295) Robin Engine Won’t Run
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09-01-2021, 11:34 AM | #23 |
Gone Wild
Join Date: Jul 2020
Location: NC
Posts: 773
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Re: CT Rebuild 375 (295) Robin Engine Won’t Run
Were you able to get both jets out of the carb when you cleaned it, or did you just spray carb cleaner in there? There are two. One on top, and one in the bowl. Also, look at the bolt that attaches the bowl to the carb There are passages in that bolt that allows fuel up to the main jet from the bowl. I've seen them partially clogged and often gets missed in clean up. If its clogged, adequate gas won't get to the main jet.
Since this carb worked days before the engine was sent off for rebuild, look closely at the carb gaskets and spacer/insulator as well. If they are leaking air, the mix will be wrong and it won't run right. These engines are finicky on fuel air mix. There isn't any adjustment, so the jets, ports, and air passages need to be right. I guess we will se what comes of this as the new parts are added. |
09-01-2021, 12:44 PM | #24 | |
Vintage tech
Join Date: Sep 2009
Location: South
Posts: 3,216
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Re: CT Rebuild 375 (295) Robin Engine Won’t Run
Quote:
The passages that usually need cleaning is under the main jet that is no longer available from ezgo and they are very hard to remove. Carb cleaner normally won't clean it. An Ultrasonic Cleaner will clean that. Maybe I misread |
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09-01-2021, 03:53 PM | #25 |
Not Yet Wild
Join Date: May 2019
Posts: 48
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Re: CT Rebuild 375 (295) Robin Engine Won’t Run
Well I picked up the spark checker as y’all recommended and tried it out. Both sides create spark. It still fired sporadically with only one plug, both right and left, while testing. I was not able to get a set of OEM plug wires. The videos show brief periods of no spark but it’s just the camera not picking it up, I watched with my naked eye extensively and it’s continuously firing spark on both sides.
Left (drivers) side plug Right (passenger) side plug I also picked up another set of NGK BPR4ES plugs, gapped to .030 and a set of Autolite 65 plugs gapped to .030 and tried both sets. No difference, still barely runs but backfires more with fresh set of plugs when I let off the throttle. Update: right after posting this Amazon showed up with the aftermarket coil, I took the plug wires off of it and installed them and still no change, barely runs. |
09-01-2021, 05:15 PM | #26 | |
Gone Wild
Join Date: Jul 2020
Location: NC
Posts: 773
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Re: CT Rebuild 375 (295) Robin Engine Won’t Run
Quote:
WingmanChris, Sounds like its carb related. Air fuel mixture. It has to be clogged passages or bad gaskets or maybe a crack in the carb to head spacer. Something else I noticed in the video, you aren't using choke when trying to start. Pre-MCI engines require choke to start when cold...Have you tried using the choke? Choke it till it starts, open the choke and it should run. |
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09-01-2021, 05:34 PM | #27 | |
Not Yet Wild
Join Date: May 2019
Posts: 48
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Re: CT Rebuild 375 (295) Robin Engine Won’t Run
Quote:
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09-01-2021, 10:02 PM | #28 | |
Vintage tech
Join Date: Sep 2009
Location: South
Posts: 3,216
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Re: CT Rebuild 375 (295) Robin Engine Won’t Run
Quote:
This is interesting on why it won't run. I didn't see but one video and I could hear it trying to hit. At least he now knows its firing now I hope. |
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09-01-2021, 10:31 PM | #29 | |
Vintage tech
Join Date: Sep 2009
Location: South
Posts: 3,216
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Re: CT Rebuild 375 (295) Robin Engine Won’t Run
Quote:
This is a puzzle for sure. You have fresh gas, fire , new plug wires, spark plugs and compression which I think is a little low for a rebuilt engine but it should at least run if the valve timing is correct. Manual says to leave one spark plug in when testing compression so it won't spin too fast and maybe give a false reading. You did mention yours was not turning that fast to begin with. Check that compression one more time and this time make sure you hold the throttle down with your hand to wide open and post back results for us. To be on the safe side I always reach over and unplug one of the small wires on coil when doing this. |
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09-02-2021, 05:49 AM | #30 |
Not Yet Wild
Join Date: May 2019
Posts: 48
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Re: CT Rebuild 375 (295) Robin Engine Won’t Run
So I double checked compression this morning when the engine was cold from sitting all night. Removed (+) coil wire, fuel line from carb, and crankcase signal line to fuel pump. Held carb linkage wide open and tested.
Left (drivers) side 133psi Right (passenger) side 145 psi When I get home today I will check valve lash. I know .004 is what the manual states but I see some recommending .006, not sure how much difference it will make. Also the engine supposedly has new intake valves per the rebuilder. I will also thoroughly go through the carb again. I also have an aftermarket carb showing up today that I can use to test if needed. Question, if I use a spray bottle to spray gas in the carb with the fuel lines disconnected, or directly into the intake with the carb removed, while cranking the engine should it run? Would this be a legit test or no don’t bother? |
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