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Post by cjarvis64 on Jul 7, 2021 10:58:14 GMT -5
Just got my '08 Zuma back from my parents place and am trying to get it up and running again. I can get the starter motor to turn over a few times with starter fluid and the kickstart, but it only stays running for maybe a second.
Here's what I've done so far, in this order:
1. Initially tried to start it with the kickstarter, noticed battery is dead. (electric starter didn't work, none of the lights turning on.) No start at all.
2. Trickle charged the battery for 15 hours or so on 12v-2A setting. Electric Starter and all lights and electric functions working properly. Engine will not start with electric starter. Removed trickle charger leads.
3. Removed air filter cover, air filter was rotted and oily. I have a new yamaha air filter on order currently.
4. Sprayed starter fluid into carburetor air intake. Tried to kickstart - engine acts like its going to start for a second or so then stops. 5. Removed spark plug for inspection, noticed brown discoloration around spark gap. Replaced spark plug with new one. Engine will still not start.
5. Removed carb and disassembled. appeared to be very clean, all ports and jets clear. cleaned with carb cleaner just to be sure and then re-installed the carb.
I have also confirmed spark on my plug, confirmed fuel flow by sucking on the vacuum line to let gas flow out the fuel line, and have tried jumping it with a car battery (car was OFF) - no dice. I have a compression tester on the way but from what I can tell I'm getting good compression. does anyone have any ideas? Thanks.
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Post by aeroxbud on Jul 7, 2021 11:58:48 GMT -5
I would drain, and put fresh fuel in it.
Without the air filter, it's sucking too much air.
Did you clean out the choke starter passageway in the carb?
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Post by cjarvis64 on Jul 7, 2021 12:06:40 GMT -5
I would drain, and put fresh fuel in it. Without the air filter, it's sucking too much air. Did you clean out the choke starter passageway in the carb? I have drained the fuel and refilled with fresh gas, but maybe I should try emptying the fuel line more just to be sure all of the bad gas has been evacuated. There was some gas at the bottom of the tank that my siphon could not get to. I assume I cleaned out the choke starter passageway, as I cleaned everything out pretty good but I’m not sure. What does it look like on this carb? |
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Post by lunatuck on Jul 7, 2021 12:16:53 GMT -5
Have you checked the pressure activated petcock? Remove the fuel line and suck on the pressure line and see if fuel flows out. They can go bad.
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Post by cjarvis64 on Jul 7, 2021 12:30:06 GMT -5
Have you checked the pressure activated petcock? Remove the fuel line and suck on the pressure line and see if fuel flows out. They can go bad. I have done this already. I sucked on the vacuum line going into the carb and watched gas flow out of the fuel line onto the ground |
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Post by cjarvis64 on Jul 7, 2021 12:33:41 GMT -5
I would drain, and put fresh fuel in it. Without the air filter, it's sucking too much air. Did you clean out the choke starter passageway in the carb? I’ve ordered another air filter from Amazon as the old filter was deteriorated, and oily. I’m assuming from the many times I’ve flooded the carb trying to get the thing started. The air filter won’t be in for a couple of weeks, is there a place I can get this stuff faster? Thanks again. |
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Post by aeroxbud on Jul 7, 2021 12:58:19 GMT -5
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Post by captincvmn on Jul 7, 2021 13:01:34 GMT -5
Also dump carb as gunk hides in the bowl
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Post by lunatuck on Jul 7, 2021 13:48:21 GMT -5
Without an air filter in there, your old jetting will be too rich and would make it hard to start.
You may be able to find some sort of air filter foam on amazon that you could cut to fit.
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Post by cjarvis64 on Jul 7, 2021 17:24:38 GMT -5
I’ve got the battery charging up right now on a 12v 2A trickle charger, and will test the battery voltage once it’s charged for 12 hours or so. Something else to note, the gas cap is missing a screw that fell in the gas tank (fishing it out later) The gas cap isn’t getting a good deal on the tank because of this, not sure if that messes with the fuel vacuum flow or not. I’ve also read where my issue could lie with a bad reed valve or a need for a valve adjustment.
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Post by Zino on Jul 7, 2021 19:08:27 GMT -5
I did not hear you verify that after kicking it over that you have fuel on the plug .
Your pilot jet is probably varnished shut .
Old Gas will do that.
Bare minimum
Clean the Pilot jet
It has small holes in the length of it make sure you can see through all of them if not a thin wire and a soaking in carb cleaner can make a difference .
You could do a full carb cleaning all jets and passages.
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Post by cjarvis64 on Jul 8, 2021 8:47:01 GMT -5
I did not hear you verify that after kicking it over that you have fuel on the plug . Your pilot jet is probably varnished shut . Old Gas will do that. Bare minimum Clean the Pilot jet It has small holes in the length of it make sure you can see through all of them if not a thin wire and a soaking in carb cleaner can make a difference . You could do a full carb cleaning all jets and passages. I kicked it over the other day with the plug removed to try and clear the carb of fuel and I noticed a slight fuel vapor spit out on the first kick, so fuel must be getting to it. I remember the pilot jet being really clean, but I will check it again for good measure. I have cleaned the carb already to the best of my ability, it already looked super clean when I took it apart initially. Only two small spots in the bowl that I was able to clean out. |
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Post by cjarvis64 on Jul 8, 2021 12:45:53 GMT -5
I just ran a compression test (no air filter in yet) and I’m reading 125 PSI kickstarted. Is this too low? And if so is it because of the lack of air filter?
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Post by geoffh on Jul 8, 2021 13:51:55 GMT -5
125 is fine,you have to have the scoot complete,wait until you have the air filter assy fitted you may have unused fuel in the crank case,pull the reed cage/valve check it seals and the crankcase is clear. Is it a good strong spark?
Geoff
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Post by chadbullet on Jul 8, 2021 14:00:06 GMT -5
I have been able to get those motors running with as little as 90psi. Another thing to check is if maybe the exhaust is plugged. I've had oil run into the pipe on these from leaky seals on the oil pump and wouldn't start until I pulled it off and dumped it out.
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