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Post by crujonesisradd on Jan 23, 2014 12:40:12 GMT -5
So far the only thing I haven't done is a compression check. I'll try that as soon as possible and post up my results.
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Post by crujonesisradd on Jan 22, 2014 18:57:49 GMT -5
I start adjusting the air fuel from 1-3/4 turns out, and go from there. I got it to around 3 turns out before it was at the best idle. What is this telling me? The intake manifold isn't cracked, I've checked it probably 5-10 times at this point. Intake to the air box isn't cracked either, all seems good there. I have all new vacuum tubes, as well as fuel lines; nothing is stock at this point, and the fuel valve is working correctly from the tank. I have no egr, there wasn't any from the factory on this one. The oil is clean, and right on level. It seems to stay clear much past the 500 mile mark, and it doesn't ever seem to get lower than when I initially set the oil level.
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Post by crujonesisradd on Jan 22, 2014 17:58:35 GMT -5
Today it started, ran smooth from idle to top end. Now there is absolutely no power from stop, but runs fine past 10mph. I almost have to give it a hard push to go anywhere from a stop sign. I checked the variator and clutch, both look perfect. Took apart the intake manifold today and it looked fine, as well as the airbox. I don't really understand how a crack in the airbox could make a difference while running a  jet, when some people run the jet with a pod filter with great results. The pod filter I ran had pretty much the same result as the stock airbox and filter. I've exhausted pretty much everything I can do. Would aftermarket 6g sliders make that much of a difference from a stop? If anything I feel it would accelerate from a stop better than stock rollers. |
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Post by crujonesisradd on Jan 19, 2014 17:00:10 GMT -5
Finally have an update. I took everything apart and inspected the CVT, everything acts correctly, cleaned all the surfaces, and reassembled. I still get a pretty good studder when I give it full throttle before it is warm. I have started to notice it wants to die on takeoff now, and when the stalling problem isn't present, it has nearly no power at takeoff, but runs perfectly normal above 10 miles per hour. I got a new plug to see whether I'm running rich or lean, and here is the result of a 20 minute run through the neighborhood. I don't understand how it can be running so lean with a jet, and everything assembled correctly with no issues.  |
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Post by crujonesisradd on Jan 9, 2014 17:38:15 GMT -5
I'll give all of those a try for sure. Can I start the scooter without the variator and cover on, or do I need to pull them off after I get it running? I've never tried, and it seems like the starter gear would fly out if not held in securely by the cover....
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Post by crujonesisradd on Jan 9, 2014 16:46:46 GMT -5
alleyoop, I agree with you on thinking it's a fuel delivery problem. I get nothing other than a bogging from the motor. On the center stand it dies out just the same as on the ground. I thought the same of the needle, which is the entire reason for swapping to a carb which was on a scooter running correctly at the time. The needles in both of the carbs I have aren't adjustable, so I'm on the lookout for a few small washers I may be able to add to see if it helps. There's no evap, egr, or any type of recirculation emissions parts on this scooter at all. Both carbs were initially tamperproof, both of which have been drilled out and replaced with adjustable parts. I will pull the CVT back off today and see if I see anything strange going on. What would hold the belt from climbing? I may pull the clutch setup from the good running scooter also and swap it to see if I see a difference in performance. The problem I see is that it ran perfectly fine, and pretty much over night decided to start running the way it is now.
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Post by crujonesisradd on Jan 9, 2014 16:01:53 GMT -5
Hi all, I've had a Big Chief QMB139 for around a year now. It ran perfect for several months, even reached speeds around 50mph down hills a few times. Now, the scoot starts on command every time and idles perfect, however, it bogs when twisted past 1/2 throttle. I've done tons of research to find an answer to my problems, but nothing has helped up to this point. Here are the things I've checked or changed in hope of solving my issues: -Adjusted valves to .004", and rechecked gap after running -new battery - jet, tried everything from 60-  -checked diaphragm for damage -new fuel lines, filter, and petcock was checked -new gas, and seafoam -new plug gapped at .3 -new plug wire -tried several cdi -tried stock filter box, pod filter,and no filter , all combinations -6g sliders -cleaned variator, clutch pads, and checked belt -adjusted and re adjusted carb tried another carb and auto choke, with  jet -starts first fire, idles perfect, but bogs on more than 1/2 throttle, stalls and dies if you don't let off back under 1/2 throttle. After warm up, plug is a nice brown, not covered in gas. I tried another carb with an accelerator pump to see if that would help, it made no difference. This scooter ran perfect and even broke 50mph down a few hills using a GPS as a speedo previously , but now won't go over 25, and will barely creep 5-10 mph up hills. I'm at a loss, as I can't think of anything else that could cause these problems. Anyone else have any ideas? |
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jet, when some people run the 
jet