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2003 Suzuki S40 Will Not Start (Read 347 times)
Dave
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Re: 2003 Suzuki S40 Will Not Start
Reply #30 - 04/16/18 at 18:01:12
 
Brentr wrote on 04/16/18 at 16:23:55:
U
Bad news-finally got my hands on a 12mm adapter for my compression tester... 40 PSI, barely got it to 60 with a shot of oil in the spark plug hole...

Safe to say the rings are cooked?


Did you disconnect the compression release before trying a compression test?
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Re: 2003 Suzuki S40 Will Not Start
Reply #31 - 04/16/18 at 18:30:39
 
No, what is the procedure for doing that?

That wouldn’t change the fact/implications that the PSI jumped by nearly 50% after squirting oil in the cylinder though, right?
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justin_o_guy2
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Re: 2003 Suzuki S40 Will Not Start
Reply #32 - 04/16/18 at 18:34:12
 
Have you adjusted the valves ?
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Re: 2003 Suzuki S40 Will Not Start
Reply #33 - 04/16/18 at 18:49:36
 
No valve adjustment has been done.
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Re: 2003 Suzuki S40 Will Not Start
Reply #34 - 04/16/18 at 18:52:56
 
Get the decompression disconnected
Test
Still low?
Make sure the valves aren't tight.
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Re: 2003 Suzuki S40 Will Not Start
Reply #35 - 04/16/18 at 21:18:07
 
Is that as simple as disconnecting the relay?
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Re: 2003 Suzuki S40 Will Not Start
Reply #36 - 04/17/18 at 02:54:50
 
I've never done it, but the solenoid that pulls the decompression lever can't do that if it's not plugged in.
And check the linkage, make sure it's not engaged. It's hard to get compression with the decompression engaged.
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Gary_in_NJ
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Re: 2003 Suzuki S40 Will Not Start
Reply #37 - 04/17/18 at 08:29:23
 
Disconnect the lever at the top of the cylinder head. Also, when running a compression check make sure the throttle is wide open too.
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Re: 2003 Suzuki S40 Will Not Start
Reply #38 - 04/17/18 at 14:28:52
 
Disconnected the decompression solenoid cable, retried the compression test and got the same results: 40 dry, 60 with oil in the cylinder see.
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Re: 2003 Suzuki S40 Will Not Start
Reply #39 - 04/17/18 at 19:48:33
 
You're going in to fix it
So
You might as well
Prop the carb slide up
Make Absolutely sure the valves are not tight
Test
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Re: 2003 Suzuki S40 Will Not Start
Reply #40 - 04/18/18 at 08:55:52
 
Do you have access to a leak-down or differential compression tester? It's the most complete cylinder diagnostic tool. Harbor Freight sells one for cheep.

The results will reveal whether its the intake valves, exhaust valves, rings or piston.
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Re: 2003 Suzuki S40 Will Not Start
Reply #41 - 04/18/18 at 10:45:43
 
You disconnected the wires to the decomp ,but you need to check that there is slack in the cable running to the arm on the  shaft , if not the exhaust valves could still be being held open.
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Re: 2003 Suzuki S40 Will Not Start
Reply #42 - 04/18/18 at 17:55:15
 
batman wrote on 04/18/18 at 10:45:43:
You disconnected the wires to the decomp ,but you need to check that there is slack in the cable running to the arm on the  shaft , if not the exhaust valves could still be being held open.


Spot on
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Re: 2003 Suzuki S40 Will Not Start
Reply #43 - 04/18/18 at 18:40:20
 
Yes. I made sure to test the compression with and without the slack. It yielded no difference in the compression values.

I’ll look into the differential compression tester. There is a harbor freight close by.
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Re: 2003 Suzuki S40 Will Not Start
Reply #44 - 04/18/18 at 19:37:16
 
Why would you test it without the slack ?
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