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Post by mojo89 on Sept 5, 2014 8:39:40 GMT -5
The oem carb is an updated model with fuel air mix screw that isn't sealed
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Post by mojo89 on Sept 4, 2014 13:40:28 GMT -5
That might work, but I'm gettin new ones for 50 bucks
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Post by mojo89 on Sept 3, 2014 16:56:24 GMT -5
So my new jug is scarred. My guess is since the air filter wasn't oiled it let in debris. Another new jug and piston.
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Post by mojo89 on Aug 22, 2014 21:16:17 GMT -5
That's what I figure. But this is twice for compression problems being my initial diagnosis, is something causing it? I've done a few basic upgrades; cdi, muffler, 60cc, cvt, but the carb and air filter are new oem stock. Would any of these be causing a specific part to go out? My old 50cc parts didn't look very bad at all, but it started right up after I replaced it.
Would you recommend opening the valves to say, .06 or .07 mm then? I haven't researched it, just going by the manuals
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Post by mojo89 on Aug 21, 2014 21:26:01 GMT -5
Will do sunday. I set my valves to .005 mm and head was torqued to 20 ft/lbs when I did the job, per the manuals I obtained from this forum. Basically going to do a cylinder tear down/build up inspection again.
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Post by mojo89 on Aug 21, 2014 10:12:08 GMT -5
2012 taotao atm50, about 14k on the odo.
I replaced the piston, cylinder, and head at about 11k due to low compression and it ran great for a few months. I used a 60cc piston/cylinder instead of a 50cc when I replaced it.
Some punk pushed my bike over one night and pulled my cdi out of the frame, but I reattached and it ran. The rubber holder for the cdi was broken, and allowed it to touch the frame and would bog when it did because it was short circuiting, but I have since replaced it.
It sat for a week after that incident, then it wouldn't start. I did valve adjustments and replaced the air filter and carb, before I had it compression tested and found that I only have 40 psi of compression. Could it be anything other than head/valves, cylinder, piston, or their gaskets?
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Post by mojo89 on May 19, 2014 7:28:12 GMT -5
I'm getting lots more power out of my scoot now, it's taking off faster than most traffic and keeping up all the way to 30. It'll pull pretty well to 35 and slowly up to 40, people are asking what I did lol
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Post by mojo89 on May 18, 2014 18:17:15 GMT -5
Put the new carb on and it runs great again. Same size as my stock carb, got it from my local taotao distribution center; it has a better throttle cable guide and a fuel/air screw that isn't sealed, though I don't know if jets are the same inside. The reason I put a 60cc piston on was because my original one lost compression one day, I posted about it back in january. Had to use a 60 because the distribution center didn't have any 50's for some reason. I didn't have to change the carb at all when I got the 60 for it to run.
Thanks for all the advice, knowledge, and wisdom, much respect and love for you all and your bikes. Ride on
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Post by mojo89 on May 16, 2014 12:07:08 GMT -5
My new carb has the fuel screw. I'll throw it on and hope that does it
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Post by mojo89 on May 15, 2014 20:32:54 GMT -5
Cleaned my carb, only issues I saw were the float bowl and autochoke gaskets being somewhat old. I reassembled and ran my bike, no changes. Have to see what a whole new carb will do if I don't have any other ideas by tomorrow.
If it matters, I upgraded my piston, cylinder, and head a couple hundred miles ago, used a 60cc cylinder and piston. Transmission upgraded slightly last november. It ran great with the upgrades; I replaced the exhaust, cdi, coil, and spark plug early last year as well. Got 100 mpg and cruised at 35(no hill or wind, ~75% throttle) with the 60cc. It's not even fully broken in yet.
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Post by mojo89 on May 14, 2014 18:44:17 GMT -5
I mispoke earlier; if I pull my throttle all the way open and release it immediately, it revs like normal and goes back to idle just like it would when it's running correctly. Only when I hold throttle open does it bog. Where else can air leak? Or fuel blockage? Fuel and vacuum lines, fuel filter, and carb have a good 15k km on them, they are original stock parts.
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Post by mojo89 on May 14, 2014 18:33:08 GMT -5
Valve gaps good at .05mm, vacuum lines and intake manifold still good, my carb is taotao atm50 stock and has no fuel/air mixture screw, replaced entire air filter housing.
Nothing helping performance so far. I'm a little loathe to put on a brand new carb in case I'm missing something, I'm disassembling and reassembling my old one once more first.
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Post by mojo89 on May 14, 2014 15:49:42 GMT -5
I'm about to check my intake manifold and vacuum system, check valves, and check my carb's settings and integrity; if it doesn't run after that, I will begin replacing the air filter, then the carb. This thing WILL work again.
Here's a video of the problem, look forward to posting one of the solution!
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Post by mojo89 on May 10, 2014 19:04:59 GMT -5
Diaphragm seemed ok, no rips holes or hardening. Anything else to watch out for?
If I open throttle all the way for even a second it dies right away, rpm drop off once I give enough gas for more than 1000(guess) but if I let go before it dies it will get back up to idle.
Think I'll try using a different carb to process-of-elimination the whole thing but if it is I still want to fix it.
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Post by mojo89 on May 9, 2014 19:48:14 GMT -5
My scooter ran great for about a mile after I started it the night this issue cropped up. I stopped at a light, and when I pulled the throttle on the green light, the engine died.
It starts up just fine with electric and kick starter, idles beautifully, but once I give it throttle to rev up and go, it bogs down and cuts out right around the rpm where my clutch engages if I don't lay off the gas.
I disassembled the carb itself and also air box to check jets and passages for any gunk or blockage; valves are set at .05; vacuum and fuel lines are all good.
I'm running aftermarket cdi, coil, cvt, exhaust, and upgraded from 50cc to 60cc cylinder, but the rest of it is stock. Put about 15,000 km on it since last feb.
I will recheck the valves, as they are still fairly new. Also will recheck the accelerator pump and main fuel jet.
Any other ideas?
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