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Post by tvnacman on Dec 29, 2014 13:57:39 GMT -5
leave the old air box where it is , pull the hose from the air box to the carb . Slip this on the back of your carb . John Why leave the air box where it is? Wouldn't the arm be in the way of the new filter? look at the hose from your air box to your carb next to the size of the pod filter . |
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Post by tvnacman on Dec 29, 2014 7:44:30 GMT -5
leave the old air box where it is , pull the hose from the air box to the carb . Slip this on the back of your carb . John |
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Post by tvnacman on Dec 29, 2014 6:39:27 GMT -5
Is it doing it when you shut down the throttle? Considering your head has a broken exhaust stud I'd say that is your problem. Air is sucked back into the combustion chamber causing a lean condition. Since there is not enough gas to provide adequate combustion the remainder passes into the hot exhaust where it ignites. I know that seems counterintuitive but that's the way it works. I'd put the new head on with a good gasket before doing anything else. I bet that will fix it. It is doing it constantly pretty much, less when at higher RPMs this is starting to sound like timing , the other day I had a hard time getting my scooter started . when it did start it backfired via the muffler .. The ran really bad . I keep a few cdi's under my seat , I plugged in a different cdi perfect . Can you shoot a video with you magneto on the "T" mark and the position of the cam . I would like to check that/see that . John |
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Post by tvnacman on Dec 28, 2014 20:25:11 GMT -5
there is a vin check somewhere.
John
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Post by tvnacman on Dec 27, 2014 19:38:37 GMT -5
What several members have done is drill a 1/16 inch hole in the gas cap, then plug the gas tank vent tube if it had one. Most of those who did this did not have a vent tube, and needed the extra ventilation to prevent vacuum lock. 2nd this |
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Post by tvnacman on Dec 27, 2014 18:32:49 GMT -5
if you look at the details of the link I posted the idle shaft gear (#14) comes in two sizes . I wold all so check the teeth on the variator pulley that the bendix contacts .
John
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Post by tvnacman on Dec 27, 2014 17:29:22 GMT -5
are you filling it till it just about spills ? your all over the place . are you getting all the kick starter parts back in and in the correct places ? John |
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Post by tvnacman on Dec 27, 2014 15:10:35 GMT -5
an overly rich mix will cause backfiring . see where it is firing .
John
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Post by tvnacman on Dec 27, 2014 13:27:25 GMT -5
With the 100cc bbk you really need to be at TDC to get it started . A HP cdi with fixed advanced (preset) timing will stress all components more than more than a TDC . If you guessing on timing that is a big problem . vac and ring problems will not cause backfiring problems .
John
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Post by tvnacman on Dec 27, 2014 7:13:08 GMT -5
Lain I agree with what Geh has told you in the last few hours . Your welcome to do things as you wish . Certain things are done a certain way because it gives a positive lasting result . He is not telling you if you just put the rings in without honing it will not run . The question is how long will it run for verses honing ? When you load test an automotive battery , a heavy electrical load is placed on the battery , if the voltage drops while the heavy load is on it they deem the battery no good . In most cases batteries are rated and the heavy load placed on them is based on there rating .
John
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Post by tvnacman on Dec 26, 2014 19:09:04 GMT -5
the 50cc carbs don't have do not have a loop to fish a hose through .
Did you get it with a new Bendix ?
Seems till you get the bugs worked out it happens to be one thing after another . Very rare that vacuum will cause back firing .
John
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Post by tvnacman on Dec 26, 2014 18:08:19 GMT -5
are you getting the tip of the shaft in the hole of the cvt cover ? Did you check the spring on the bendix gear , is it working smoothly ? I think there is a bushing that sits in the hole the bendix sits could you have lost it this . John |
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Post by tvnacman on Dec 26, 2014 14:42:26 GMT -5
the sound in the video is you starter clutch/bendix not engaging . I see that problem with a weak battery , not a strong enough spin to push out and engage . It could be binding up , open up the cvt and check the bendix for free movement .
John
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Post by tvnacman on Dec 26, 2014 8:31:27 GMT -5
Well , I'm glad you have gotten it sorted out . I can tell you you now know the ignition system in and out .
John
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Post by tvnacman on Dec 25, 2014 13:12:57 GMT -5
do you have a kickstand switch , with everything in the run position you should have infinite on the black/white wire .
John
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