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Old 08-28-2013, 04:58 PM   #16
KPD OP
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Thanks everyone for all the feedback. Here's the latest update, my focus has shifted as I can't even get the bike to start now.

When I bought it, it would start up and run for a couple twists of the throttle then die. Now I have nothing... Here's what I've done.

New battery, points adjusted to spec, new petcock, cleaned fuel tank with CLR and gravel, cleaned airbox and put new filter in, cleaned and rebuilt carb including replacing float, cleaned fuel lines, replaced spark plug.

Now i don't even get it to turn over, the kicks feel empty.

All lights work when battery is charged. I checked the spark plug and i don't see a spark but I feel a shock when i touch it and kick while holding it to the engine block.

Any ideas??? Tomorrow I'm going to try it with a new fuse and spraying some starter fluid into the carb to see if it was either the fuse, or a fuel related issue with the carb. i don't know!
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Old 08-28-2013, 07:34 PM   #17
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Well as they always say; you need three things to run an engine. Fuel. Air. Spark. Are you sure you're getting fuel into the engine? Does the spark plug come out wet with gas? To me it sounds like an ignition issue. You said that you can feel a shock but I'd want to see a dang strong nice big blue spark. Perhaps you have a points or coil issue.

Post some pics of it too!
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Old 08-29-2013, 04:36 PM   #18
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Thanks alot - i agree, it's probably an electrical thing with the plug not getting good spark. next step here we go! thanks for the feedback
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Old 08-30-2013, 10:59 AM   #19
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"kick feels empty"... did you set the valves? if so may have been on the wrong stroke & a valve is open

if not.... check them anyway
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Old 08-31-2013, 03:26 PM   #20
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Ok, definitely not getting spark.

I bump started the bike and it started up, didn't stay afloat long, but at least it started. I guess i need a new ignition coil?
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Old 08-31-2013, 03:57 PM   #21
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Why do you think the ign coil is bad if it push starts. SOUNDS LIKE A MYRIAD OF OTHER PROBLEMS. Do you know how to properly clean carbs ,as in total dissassembly and making sure every little orifice and passage is open,setting float levels,are the points set properly,timing? good gas? I have a suspicion that the pilot jets are clogged and possibly the choke passages .
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Old 08-31-2013, 09:55 PM   #22
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2013-1971 = 35?
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Old 09-01-2013, 07:47 AM   #23
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Does it have compression? First thing I checked on my dump find XR100. Did not have any but an easy fix, dump oil in the cylinder and crank it up. I guess that freed the sticky valve and brought the compression where it should be, 145PSI for that bike.

Been running fine ever since but sure I also cleaned the carb after the compression check. Wouldn't have been worth my time cleaning the carb first and finding out later that it did not have any compression.
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Old 09-01-2013, 09:01 AM   #24
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i thought maybe i needed a new ignition coil because the spark plug isn't sparking at all, with the points cleaned and set to spec, on the bike and on the brand new spark plug.

Bump started a few more times this morning to see if i could rule anything out. any insight would be greatly appreciated.

Did it a couple times while spraying some starter fluid into the carb at 1/2 choke... that didnt do anything.

Tried a few different settings on the idle/air screws, still won't stay alive. I had already completely cleaned and rebuilt the carb, replaced all jets and gaskets, and the float. All jets were clean as a whistle, could see straight through them. Float level i don't know how to set that, it's possible that's the problem. When I cleaned the carb, it soaked overnight in pine sol, cleaned everything spotless, cleaned with carb cleaner too. blew it all out with compressed air.

Compression seems fine. I don't have a gauge, but i put my thumb over the spark plug hole and kick, real fast air coming out.

Finally, the clutch is just not working properly, i just need to go ahead and clean that out, de-gunk it. I feel like that isn't letting the bike stay afloat, is that even possible? Clutch lever pulled in doesn't always allow me to switch gears, it's just sticky and finicky in general.

Overall the bike would rather be off than on. I'd like to change that, hah.

Also, i'm aware the math doesn't add up for 1971 to 2013, i'm just going off what the bike's previous owner told me. maybe the guy rode it periodically for a few years then let it sit, who knows.

Thank you all so much, it is very helpful to get the feedback here, especially since this is my first bike and I'm figuring it out as I go.
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Old 09-01-2013, 09:31 AM   #25
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I think i need to clarify, or need clarification. I have no spark at all. that's for sure. I see nothing.

My newbie self maybe thought my bike was running, but in actuality it wasn't started, just turning as I clacked it into gear at low speed. i still think the ignition or whatever gets the spark going needs replacing, as it's just not wanting to start at all. what goes into getting a plug to spark, and how would i test for what's bad?

the weird thing, though, is it would start up when i bought it. Granted it would only stay alive for about 10 seconds or less, but it would actually kick start. now i get nothing after i did some stuff to the bike. i guess the ignition could have gone bad in that time? or me kicking it a bunch of times after it sat for so long burnt those parts? The plug is new and the points are set to spec and cleaned.

Son of a gun!

Any thoughts from you more experienced peeps would be great. thank you so much
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Old 09-01-2013, 09:58 AM   #26
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Thanks Benesesso,

I definitely had the plug metal touching the engine block when i tested.

I don't actually know if the bike is running, I know that's a newbie thing to say. i'm bump starting it and clack it into gear, and it seems like the bike tries to start. it will run and the piston moves because the bike is rolling, but it's not even close to staying alive. It wants to slow to a stop and die. giving it throttle does nothing. I think it's a spark issue. All the parts are essentially unused, like the CDI, ignition coil, Stator, etc... they're just really old. they possibly could have gone bad over that time. i don't know. I'll try setting the gap of the plug to .020

i prob just need to get a meter and check the coil and CDI box

thanks
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Old 09-01-2013, 10:26 AM   #27
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It ran before you changed the points.
Go back there and make sure they are correct.
Incorrectly set points will prevent starting.
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Old 09-01-2013, 10:58 AM   #28
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Actually the kid i bought it from cleaned the points and set them, it would start after he did that, so i don't think that's it. he also replaced the battery and changed the oil. otherwise I did everything else.

I just ordered a new ignition coil.. here we go, process of elimination.

While i wait for the new coil to arrive, gonna open the clutch up and clean it all out, clean the plates, etc.

if nothing else, i'm learning alot and will know this bike in and out. haha.

Thanks for your help guys (seriously). i'll keep you posted!
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Old 09-01-2013, 04:21 PM   #29
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Cleaned the points and set them, good if properly done but that bike should have a condenser connected to the points.

Those condensers can be so very aggravating when they fail and if you don't have an idea of the symptoms they cause...some just like you are finding.
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Old 09-01-2013, 07:32 PM   #30
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Points ignition is easy. turn on key and flick points with fingernail while watching for spark. NOS condensers can be bad out of the box. If it's on the points plate, toss it and put a known good one up on the coil bracket connected to the points terminal. It takes three things to make an engine run, compression, spark, and fuel. Have a good spark? Give it a shot of ether, and try it then.
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