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Post by onceler on Sept 8, 2014 13:50:22 GMT -5
Hello, this is my first post on here and I've read many similar posts, but I still can't get my scoot running. I bought a 2010 taotao with 1P39QMB (sp?). It has run ok for the first few weeks, however the lack of speed and acceleration was too scary for me, I've owned a couple 2T's in the past and they seemed to be faster. Anyway, I was riding it and the drive belt broke. So I decided to buy a BBK that came with 50mm cylinder, new head,new rockers, new Keihin carb., different size main jet, coil, and cdi. and I also replaced the belt. To make a long story short it hasn't ran since I installed the kit. I've checked for spark on the valve cover and it seems to have a blue spark, the plug never appears wet, but it does get black after several attempts. I've tried starting fluid. It just cranks over and kind of putts as long as the starter is on, but as soon as I let go it will not run on it's own. I've advanced and retarded the timing chain, it seems to have good compression. Honestly I'm out of ideas at the moment, can anyone help?  |
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Post by alleyoop on Sept 8, 2014 14:11:57 GMT -5
Are you sure you timed it right when you put it back together? I will start with verifying the timeing, take the Valve cover off and Align the Cam Sprocket with the two little holes even with the top of the head and the big hole straight up, THEN take a PICTURE of it AND a PICTURE of the flywheel to see where it is timed at.
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Post by onceler on Sept 8, 2014 18:27:18 GMT -5
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Post by alleyoop on Sept 8, 2014 18:42:02 GMT -5
Well that looks good, did you adjust both valves to .003 inchs or .003 inchs on the INTAKE and .004 inchs on the EXHAUST?
What size carb did you get, And what size was on there? Also which cam did you get?
Also turn the fuel ratio screw clockwise until it stops and then turn it out 2 - 2 1/2 turns. If you crank it and it is BLACK with soot that means the plug is not firing or hardly firing or it is getting to much fuel. Do you have a ground wire from the motor to the FRAME, if not a good ground the plug will not fire while in the motor?
Can you take a picture of the carb area?
Alleyoop
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Post by onceler on Sept 8, 2014 19:38:46 GMT -5
Here are some answers to your questions, Alleyoop.
1.) Intake gapped at 0.003 in.
2.) Exhaust gapped at 0.004 in.
3.) carb is same size 18mm that I took off, except it has the air/fuel adjustment
4.) I'm honestly not sure what cam it is. It looks the same as the original except for more numerous holes on the gear. I measured the lobe height and couldn't tell much difference.
5.) I made the adjustment that you recomend 2 to 2 1/2 turns out as a starting point
6.) I re-did the conections on the Batt (-) to the valve cover bolt and put a new wire on the valve cover to frame ground
I'll post a picture of the carb area tomorrow as well as a video of the plug firing cause I'm not sure if it is a strong enough spark or not, it also seems to fire the entire time the engine is being cranked instead of intermittently like only when it's around TDC? Not sure if this makes sense to you...maybe the, video will help.
I've messed with this thing for the last 2 weeks with the same results, so I really appreciate the help.
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Post by alleyoop on Sept 8, 2014 20:26:48 GMT -5
So the carb is a 18mm and did you up-jet the carb? Because it will need more fuel with the BBK that may be the whole problem. So try this just to see if it is lack of fuel it may start and or do a little better.
Take the AIR TUBING off and COVER the air intake side of the carb with your hand just leaving a few fingers a little open so it does get some air but not fully open air. Doing that should suck in more fuel and see if it actually starts or the same.
Alleyoop
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Post by rcq92130 on Sept 8, 2014 21:19:09 GMT -5
Just a thought - might want to try with the old cam (since that's easy). Will eliminate one variable.
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Post by Moat on Sept 8, 2014 21:47:57 GMT -5
... it seems to have good compression. How much is "seems"? Can you do a compression test? Did you leak-check the valves before installing the head? If you've got a good spark at the right time, cam timing is correct, fuel in the (clean!) carb - and it still won't fire on ether... looks to me like it's just not quite making enough compression. Bob |
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Post by alleyoop on Sept 8, 2014 22:10:00 GMT -5
Easy way to test if it has enough compression for the motor to run is use the finger test. Most folks do not have a compression gauge so test if compression is descent.
Take the plug out and stick your finger in the plug hole and hold it nice and snug, then OPEN and hold the throttle wide open and crank it. If it lifts your finger off the hole you have enough for the motor to run, if you just feel some pressure on your finger then it is very low on compression.
Alleyoop
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Post by onceler on Sept 12, 2014 21:24:42 GMT -5
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Post by onceler on Sept 12, 2014 21:39:29 GMT -5
Just re-read Moats post and he may be on to something, I didn't leak test the valves. I lapped them just using my finger and some paste, but I never checked them afterwards...I'll look into this also hopefully this weekend.
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Post by alleyoop on Sept 12, 2014 21:39:27 GMT -5
One thing connect the Air Filter to the carb without the air filter it may not be sucking in fuel. If you have starting fluid then spray it into the air intake. Or you can drip some gas directly into the intake by taking the Vacuum hose off and pouring a teaspoon of gas then reconnect it. If it fires at least once then we know fuel is not being sucked in.
Alleyoop
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Post by onceler on Sept 13, 2014 13:34:50 GMT -5
I just bought a compression gage with the right fitting for use on this scooter. I hooked it up opened the throttle and after 5 compression strokes it read 150 psi, after 8 compression strokes it reached it's peak of 165 psi.
Does anyone know what a 82cc BBK should read?
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Post by alleyoop on Sept 13, 2014 14:01:02 GMT -5
Anything over 150PSI is EXCELLENT, you do not have a compression problem.
Alleyoop
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Post by onceler on Sept 13, 2014 14:25:24 GMT -5
hmmm...here's what I just did....I pulled the check valve out of the compression tester and applied 30 psi to the engine at TDC and it would not hold any air. It just came out the carb along with fuel. So I'm gonna go ahead and pull the head and check the intake valve. It can't hurt at this point just to check it out. Even if I did this "leak down" test wrong...I'll let you guys know. Thanks
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..BAD TO THE BONE..
