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Post by flatland2d on Aug 13, 2014 22:42:14 GMT -5
I just had a problem pop up seemingly at random, not after messing around with anything. The carb needs to be primed in order to start after sitting for a while.
I use the overflow tube at the top of the carb to put a little gas inside and it will start right up after that. But cold starting will just crank with without firing.
Today I thoroughly cleaned out the carb and rechecked the idle air mixture screw. It's about 2.5 turns out. The carb bowl seemed to be full of gas when I took the carb off. It starts up when warm with just a blip of the starter button but just won't start on its own if it's been sitting.
Any ideas?
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Post by jjoshua20213 on Aug 13, 2014 23:18:52 GMT -5
Sounds as if the vacuum is to low to supply the gas. Try letting it idle for  secs before you cut it off after a run and see if it does anything. Do you ever get a popping sound? Check your plug to see if its been running lean. |
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Post by JerryScript on Aug 13, 2014 23:23:26 GMT -5
Trouble cold starting is usually either an issue with your enricher not working, or your valves being out of adjustment.
You can test the enricher by removing it when cold, then hook it up to your battery with jumper wires. Within 1-5 minutes the small metal probe should extend out by 3/8" further than before hooking it up. If it doesn't move, it's busted.
If your enricher is fine, and you only have trouble with hard cold starts, it's most likely valves out of adjustment.
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Post by alleyoop on Aug 13, 2014 23:27:19 GMT -5
Check you ENRICHER if it has one, it may be extended and not feeding extra fuel for cold starts. So just take it off and look at it and if it looks like this that is most likely your problem. Alleyoop EXTENDED ENRICHER SHUTS OFF EXTRA FUEL FOR COLD STARTS:  RETRACTED ENRICHER FEEDS EXTRA FUEL FOR COLD STARTS:  |
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Post by scotttx on Aug 14, 2014 10:18:57 GMT -5
bypass your vacuum petcock just to eliminate that
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Post by tvnacman on Aug 14, 2014 16:52:45 GMT -5
I had that problem at or below 40 degrees . I put in a larger pilot jet .
John
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Post by flatland2d on Aug 14, 2014 20:42:20 GMT -5
So I may have fixed the problem, but I don't know exactly what did it.
I started with the enricher. When I took it off (cold) it was in the retracted position which would be correct. The pins were far into the connector and close together so I wasn't able to put voltage on it. I may take it off again after the next time I ride to see it in the extended position, but I feel like I can rule out it being stuck since it was already retracted.
I cleaned out all the holes where the enricher goes and removed the header piece that attaches the enricher to the carb. I cleaned it out just to be sure. The carb is only about two months old so everything still looked pretty new.
In the process of cleaning the enricher, I sprayed a lot of carb cleaner into the holes in the carb. I didn't know if this would mess with the gas in the bowl, so I drained it out a few times with the drain tube. I noticed the screw at the end of the tube felt a little loose when I opened it. Maybe it was loose enough for gas to leak out over time? Anyway, when I put it all back together, it started up fine.
I don't know if messing with the carb by filling and draining it helped it to start cold, but I will know tomorrow when I go to try to start it again.
Thanks for the input!
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Post by geh3333 on Aug 14, 2014 22:47:48 GMT -5
Sounds as if you fixed the problem . " hopefully"
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Post by flatland2d on Aug 14, 2014 23:13:03 GMT -5
Just went out to check since it has been sitting for a few hours and was cold again. Sure enough, it started right up. I'll wait until tomorrow to say it's definitely fixed, but this was a very good sign. It must have been something wonky with the enricher or I was leaking gas out the drain tube.
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Post by geh3333 on Aug 14, 2014 23:20:17 GMT -5
Nice easy fix .
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Post by JerryScript on Aug 14, 2014 23:26:47 GMT -5
There could have been some deposits from sitting gas in your carb that were loosened by the carb cleaner. Regardless, glad to hear you got it working!
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Post by flatland2d on Aug 15, 2014 22:45:45 GMT -5
Just wanted to update to say the it started up fine this morning after sitting for 10 or 11 hours, so I think I can say this issue is gone. Thanks to everyone for pointing me in the right direction!
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secs before you cut it off after a run and see if it does anything. Do you ever get a popping sound? Check your plug to see if its been running lean.
..BAD TO THE BONE..
