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used to bog down randomly, now won't start

  • Thread starter Thread starter malorty
  • Start date Start date
M

malorty

Guest
Hey everyone, I finally got on here. Hello again to those I met at Kevin's BBQ/carb sync party in Portland. So I guess I will start from the beginning for those of you not familiar with my problem. A few months ago my GS300L started bogging down suddenly and randomly. It felt like the engine power was cut in half and then abruptly it would jump back up to full power. It progressively started happening more frequently until about a month ago it pretty much always ran like that and was unridable. If it sat idling in this bogged down state it would often stall. Now it won't even start.

I took the carb to Kevin's party and we cleaned it (it wasn't that dirty though) and he boiled the body in simple green. I put it back on the bike and it still won't start. From this I am assuming the carb is fine. Check!

Today I went through the electrical and tested the signal generator, the coils, and the regulator/rectifier. I am not too good at electrical so I am not too sure as to what my readings meant so I thought I'd post them here for you guys to take a look. I've included what my manual has as the specs.

Coils (both L&R):
Primary winding= 4 ohms Spec: 3-5 ohms
Secondary winding= 12.7K ohms Spec: 22-33K
*This reading was obtained with the plug caps off. When tested with them on the reading jumped all over the place.

Signal Generator:
wires B/Bl - Br= 220 ohms* very jumpy reading (300-1000), not sure on this value
wires B/Bl - G/W= 230 ohms This reading was very clear
Spec for both above: 200-280 ohms

Regulator/Rectifier:
-On all normal direction tests meter read "1"
-On all reverse direction tests meter read around 580 except for R - B/W which was around 980
-Specs: Normal direction= continuity
Reverse direction= no continuity

From what I can see there are no loose connections or other visible problems. If anyone can offer any help or input I would greatly appreciate it.
 
Greetings and Salutations!!

Greetings and Salutations!!

Hi Mr. malorty,

According to the numbers you report, you have a couple of components out of spec. Do the easy/cheap stuff first. Have you tried new plug caps? Let me roll out the welcome mat for you...

Please click here for your mega-welcome, chock full of tips, suggestions, links to vendors, and other information. Then feel free to visit my little BikeCliff website where I've been collecting the wisdom of this generous community. Don't forget, we like pictures! Not you, your bike! :D

Thanks for joining us. Keep us informed.

Thank you for your indulgence,

BassCliff
 
Malority, if the signal gen is out, your bike won't run. Try researching replacements or upgrades for it, as well as the r/r seems the values for it are all wrong.

Anybody else have any ideas?
V
 
Thanks for the mega-welcome BassCliff. What items are out of spec? The r/r results should be opposite right? Normal direction should have a reading and reverse should be "1" right? What does it mean when those values are opposite like mine? I guess I will start with new plug caps since I got crazy readings when using the old caps. Any other suggestions?
 
malorty said:
What items are out of spec?
Click to expand...

malorty said:
Secondary winding= 12.7K ohms Spec: 22-33K
Click to expand...

If the spec is 22K-33K ohms and you are reading 12.7K, I'd say that was out of spec. Am I misreading something? Wouldn't be the first time. I must admit that I'm not pouring over the manual and doing the research. I'm relying on your reports. Check the Odds and Ends page on my website, in the Electrical section, for some good troubleshooting suggestions from some of our smarter members. :D

Thank you for your indulgence,

BassCliff
 
One of the coils is new and both are reading exactly the same resistance so I found this to be strange.
 
the spec is with the plug caps on thats what your missreading cliff
 
So with the plug caps on I should get a solid sustained reading right? Not just a quick random number and then back to "1" again? Why would the reading be so different with the plug caps off?
 
the plug caps have resistors in them to cut down on radio interference i think they are 5000 Ohm or 5K Ohm caps and it can be jumping because of a bad connection(if there is corrosion on the plug cap or if the leads not touching it right)
 
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