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Post by allistah on Aug 31, 2014 16:25:09 GMT -5
Ok, I figured it out. When I was swapping main jets, I noticed that the bowl didn't have much fuel at all. The symptoms really looked like it was running out of gas, and how far I could run before it would run out really made me feel like it was running out of gas. Then when the bowl was empty I started thinking about the needle/seat/float. I put the carb on without the bowl and started it. Gas poured out fast. Ok, gas can get in the bowl. I lightly touched the float with the bowl still off.. No gas when I would turn it over. The lever that pushes the needle is just thin metal. I took a small screw driver and bent it up a little bit so the float would have to travel higher to cut the fuel off.
Bam - problem fixed. No more running out of gas. Wow... I was about to flip out! LOL
The only problem I have now is a bit of a hesitation on the low end. I'm guessing I can get rid of that with the idle adjustment screw?
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Post by 90GTVert on Aug 31, 2014 16:30:04 GMT -5
Try the idle mixture screw first and see if that will cure the hesitation.
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Post by 'O'Verse on Sept 1, 2014 21:11:49 GMT -5
#2 is the vacuum line that runs from your 3 line style petcock running alongside your fuel in line. #3 usually has a 2" elbow shaped tube facing down. Probably a vent since it's never capped.
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Post by niz76 on Sept 1, 2014 22:46:22 GMT -5
I found this guide online when I installed my new reed valves and wanted to make sure the throttle response was nice and crisp. My carb was already tuned pretty good- or so I thought- this step by step guide helped me tune it perfectly. It's for PHBG carb, but essentially the same as most. Now my throttle response up to 1/4 is tuned perfectly! (The rest was already good) HERE IT IS.
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Post by allistah on Sept 15, 2014 13:54:39 GMT -5
I have come to the conclusion that this carburetor I bought for this scooter is junk. The float sticks closed and the bowl runs out of gas.. The arms on the float are very thin metal which bend easy, the needle seems to get stuck closed and I've had it with this carb. I've rebuilt many many carbs over the years and never had any of these sort of problems. When I install it, I expect it to just work. I must have put 30 hours in on this thing just trying to get it to run right and have the needle stick closed. This carb is going right in the trash can.
Can someone recommend a good manufacture that makes a good carb for this scooter? It is a 1986 Yamaha Jog CE50.
Thanks for any info anyone might have for me..
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Post by allistah on Sept 15, 2014 15:15:04 GMT -5
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Post by 2TDave on Sept 15, 2014 15:18:30 GMT -5
I've had a few on stock scooters. A couple stamped Leader and one Mikuni. Never had a problem.
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Post by 'O'Verse on Sept 16, 2014 0:03:26 GMT -5
Amazon.com alot to choose from. $25. Free shipping. I have a 93' jog. Carb from amazon had no problems. Might only be a 15 or 17mm.
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Post by allistah on Sept 16, 2014 14:41:24 GMT -5
I looked around online and found a place that seems to sell a better quality carb. It has a brass float and a better needle/seat. Will post back once I get this thing and install it
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Post by allistah on Sept 26, 2014 16:55:23 GMT -5
I got a new carb for this scooter and installed it. No more needles sticking and we don't have the gas starving problems anymore. Now I just have a scooter that is hard to start.
Here is what happens:
The scooter runs great warmed up. When it sits for 3-4 days without being started and then when you start it, it starts right up, but soon runs out of fuel and then won't start again. I had to take the air box off and choke it with my hand to get the fuel flowing again. Once it's flowing again it runs great.
I'm thinking that it may be the auto choke at this point. Any opinions on that? I tried putting it in the freezer for a while and it was still about 18mm. The service manual said that it should retract to about 16.1mm but I haven't seen it go down that low.
Is there something else that I should look at to fix this?
Thank you,
-Allistah
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Post by niz76 on Sept 26, 2014 18:29:57 GMT -5
Is it a vacuum operated auto petcock? I didn't have my vac line seated properly on the carb and it gave me similar issues. Pushed it on nice and tight and made sure the clamp was nice and tight and good to go. Could be a float level issue again on the new carb. Is it jetted differently?
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Post by allistah on Sept 29, 2014 12:06:44 GMT -5
I saw that it seemed really rich when I would start it cold - so much so that it would die out. I leaned it out a bit and that was it. I let it sit overnight and it started right up in the morning. Now I just need to fine tune it a bit. I'm going to let it sit for two days and then try it out and see how it does. I need to get a battery for my tach but I'm going to see if I can fine tune it with that based on how you're supposed to tune it after it's warmed up to where you get the highest RPMs. I'll post back once I get that done and get some results.
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