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Author Topic: Help me troubleshoot my No-Start  (Read 5903 times)

JayPortland

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Help me troubleshoot my No-Start
« on: September 28, 2020, 07:58:20 PM »
Hey guys.
I started another thread earlier thinking it was my Kill Switch but evidently the thread has been locked so I'll just start another thread.

Someone suggested I take a look at my battery.  Its new, its fully charged and yes it is turning the engine.  Below you can see my multimeter test results on the battery.

A couple of other things to make note of.  I used a sparkplug tester to see if I was getting spark.  Here is the video showing I'm getting spark. 

New oil
New spark plug gapped at 0.7mm
New battery
New carburetor
All fuses are good and connected well
New gas (yesterday)
Verified Petcock is fully functional

Trying to adjust both the idle throttle cable and the idle gas screw next.  Still not turning on.

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Iahawk

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Re: Help me troubleshoot my No-Start
« Reply #1 on: September 28, 2020, 10:12:38 PM »
basic troubleshooting video from Scooter 911...

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CROSSBOLT

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Re: Help me troubleshoot my No-Start
« Reply #2 on: September 28, 2020, 11:01:17 PM »
Sounds like you have no compression. Troubleshoot that and if it was running before leave the idle adjustments for after it actually starts.
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Karl

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JayPortland

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Re: Help me troubleshoot my No-Start
« Reply #3 on: September 28, 2020, 11:31:28 PM »
Quote from: Iahawk on September 28, 2020, 10:12:38 PM
basic troubleshooting video from Scooter 911...



Hahaha.  I remember watching that video with silly Cletus.  Yup.  I'll watch it again for the hell of it.


3 basis questions.

Question 1.  Does your engine Crank?
Yes.
I just went outside to check to see if it was cranking and made a quick video. 

Question 2.  Is it getting fuel?
Yes.
New carburetor was installed.  Also, tank was drained and new gas was put in the tank yesterday.

Question 3.  Does the Scooter have spark?
Yes.
New NGK CR7HSA spark plug was installed about 2 weeks ago and it has been running fine.  Yesterday I also tested the spark plug.  Here is the video showing I'm getting spark. 

I just went out there and tested the spark plug again, here is the resulting video. 
« Last Edit: September 29, 2020, 01:26:06 AM by JayPortland »
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JayPortland

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Re: Help me troubleshoot my No-Start
« Reply #4 on: September 29, 2020, 01:26:46 AM »
Quote from: CROSSBOLT on September 28, 2020, 11:01:17 PM
Sounds like you have no compression. Troubleshoot that and if it was running before leave the idle adjustments for after it actually starts.

Okay, that sounds like a plan.  Test compression.  I'll get back to you guys on that.
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JayPortland

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Re: Help me troubleshoot my No-Start
« Reply #5 on: September 29, 2020, 01:41:13 AM »
Okay, so I just tried to start the engine with starting fluid.  It didn't start.  Someone else mentioned compression.  I hope its not that but its looking more and more likely.  Dang!
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JayPortland

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Re: Help me troubleshoot my No-Start
« Reply #6 on: September 29, 2020, 03:24:45 AM »
OUCH!!!

No compression.

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Pablo.gyds03

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Re: Help me troubleshoot my No-Start
« Reply #7 on: September 29, 2020, 03:49:12 AM »
Try adjusting your valves to see if compression returns. Did the engine just die on you when it was running last? A sudden loss of compression could be a bent valve, piston rings lined up etc.

Sent from my Pixel 2 XL using Tapatalk
« Last Edit: September 29, 2020, 04:09:44 AM by Pablo.gyds03 »
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Paul

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CROSSBOLT

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Re: Help me troubleshoot my No-Start
« Reply #8 on: September 29, 2020, 05:03:44 AM »
I mentioned compression and Pablo is right about the valve clearances. His questions should be answered since they are important keys to diagnosis.
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Karl

Three motorcycles 1960-1977 (restored a 1955 BSA)
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Yager 200i
Downtown 300i
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JayPortland

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Re: Help me troubleshoot my No-Start
« Reply #9 on: September 30, 2020, 05:41:10 PM »
Quick update here. 

The other day I checked to see if I had compression by moving the kickstand by hand to see if it built up resistance.  There was no resistance obviously.  That leads me to believe I have no compression.  I have a compression tester today that I'll install into the spark plug hole to see what kind of readings I'm getting.

I'll get back to you guys on this later.
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Iahawk

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Re: Help me troubleshoot my No-Start
« Reply #10 on: September 30, 2020, 09:19:20 PM »
good luck, Jay. Eagerly awaiting your results!
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JayPortland

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Re: Help me troubleshoot my No-Start
« Reply #11 on: October 03, 2020, 12:45:41 AM »
I have another update guys.  I had a chance to break down the engine to see if the piston was broken or not.  As it turns out I found the result of why I wasn't getting compression.  Check out the photos of the bent valve.  It looks like its time to get a new cylinder head with valves.





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CROSSBOLT

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Re: Help me troubleshoot my No-Start
« Reply #12 on: October 03, 2020, 01:02:32 AM »
Yup! That'll do it!

Replace valve. If piston not beat up one valve ought to do it. Lap in the new one, clean 'er up and go for it. Good job!
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Karl

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Agility 50
Yager 200i
Downtown 300i
Navy tech, Ships Engineer, pilot and aircraft mechanic

scooterfan

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Re: Help me troubleshoot my No-Start
« Reply #13 on: October 03, 2020, 06:57:36 AM »
It would be interesting to know what caused the bent valve on this scooter.
How many miles are on this scooter ?
Did something just suddenly happened while you were riding, or did somebody fiddled with the valves before it got bent ?
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Pablo.gyds03

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Re: Help me troubleshoot my No-Start
« Reply #14 on: October 03, 2020, 07:38:51 AM »
Sounds like the valve floated and made contact with the piston possibly due to over rev.
Here is a pic of my Skyteam 125 head with a bent valve. It's an easy swap, the only tricky part is getting the valve keepers back in.
https://photos.app.goo.gl/yPszdUbqBn51P4h56
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Paul

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