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Post by 1speed on Oct 1, 2020 11:00:08 GMT -5
I agree.. i will use my super smart skills to figure how to upload some pics and videos...
I only have the one vaccume line... it goes from the intake nipple to the diaphragm petcock..
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Post by 1speed on Oct 2, 2020 10:41:30 GMT -5
OK.. so after like hours of battling because im out of date with technology i got some videos uploaded to youtube...
In the scooter1 video i just want to point out 2 things.. during the filming i say two things that are not true..
1st being "Its Never ran this good" its a lie i was feeding air into the vac line with my finger...
2nd " it shakes" doesn't really shake
See where this goes
hope this upload stuff all works
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Post by GrumpyUnk on Oct 2, 2020 14:26:32 GMT -5
What I saw in the 1st vid was adequate. I would not complain, for the most part. The fact you have to bleed air into the intake via the vacuum line indicates you have a sealed intake... at least back to the carb and to the intake port on the head. You are adding air, and if there was a leak in the intake, you would not be able to add more air, likely. So that leaves the carb/choke byvalve heater/valve/thingy. If it is still rich smelling after the heater closes off the added fuel, check that you may trim the idle mixture a bit leaner. If it will still idle after you turn the misture screw 1/8-1/4 CW, then check for rich odor. TOdays fuel will not be as odorless as the regular gas of the days when you could get 3 gallons for a buck. It is not the same. ethanol or fried green tomatoes, I dunno what makes it stink, but it does, whether rich lean or right on. I did not see any puffs, so eh, what can i say? Did not watch #2. As far as I can tell it works close to proper. If it runs well, see if you can make the idle a bit stronger(I did not detect any problem...) if you feel it is weak. Tune the idle mixture screw. The KEY thing is, how does it run? Slow, fast, in the middle?
tom
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Post by 1speed on Oct 2, 2020 15:14:57 GMT -5
Do me a favor and watch the second one.. and just tell me if im crazy...
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Post by 1speed on Oct 2, 2020 16:16:12 GMT -5
One benefit of where I live in wisconsin.. our premium contains no ethanol..
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Post by 1speed on Oct 2, 2020 19:54:54 GMT -5
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Post by GrumpyUnk on Oct 3, 2020 7:40:46 GMT -5
A couple thoughts. The choke turned off after about 1:15. Counting via the video slider from startup. Close enough. The plug can be expected to be carboned up after startup as it is being fed a rich mix. Check after riding for a couple miles. If still like the pic, you are running to rich, obliviously. It did not sound bad in the video, but did have some stumbles here and there. I think your pilot may be too large or the idle set too rich. In general, the byvalve(choke dealy), flows a rich mix. It has a jet built into the float bowl, near the well tube that extends down from the choke area. The fuel in the bowl will get sucked up by the valve, and fed to the engine. Pretty rich at startup as the well is, likely, full of fuel that has slowly filled from the bowl. Once that slug of very rich has been consumed, the flow will be limited by the jet or by the valve closing. It has a direct port from the air cleaner side of the carb, right past the brass valve, and into the carb venturi behind/past the throttle plate. YOu might say it is almost a separate small carb that only works until the probe extends and cuts off fuel:air from that portion. Running in a closed area, even without ethanol laced fuel, can still cause things to smell. I have noticed just starting in the garage there's a lot more odor than before. I don't notice when driving as it is dissipated outdoors, and it is not close to my smeller. Can't say there is any visible smoke or puffs of same seen by me in the video. I just think its a bit rich from the way it runs. That and the need to poke at the throttle when it first starts means the mix may be off. Have you checked the float? With the bowl removed, carb inverted and as horizontal as you can judge, is the float parallel to the horizon(level), ignoring the float bowl gasket line as it is not. The float should be pretty much parallel to the line of the venturi, more or less, with the carb inverted. If the bowl is high at the non-pivot end, it will tend to have lower fuel level in the bowl. If the float sort of hangs below level, it will have higher fuel. If too high, it will be easy for the carb to pull more fuel. Easier, anyway, tending towards a too rich mix. If too low, a lower level in the bowl will ensue, leading to a leaner mixture overall. It is an eyeball kind of thing, but you may find a video explaining. tom
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Post by 1speed on Oct 3, 2020 9:59:49 GMT -5
Last night I put the scooter back together. Cleaned the plug. And ran the scooter after choke shut off... for 5 min at almost wot the whole time.. that's what the plug looked like when done...
It runs like its rich..
Throttle responce is a little sluggish.. and it stutters every once and awhile..
I've check float height like 10 times.. I will send picture later today.
Here's what I just dont get. I put same carb onto the wildfire. No pilot jet adjustment no float height change. Nothing... just swapped mj.. wildfire starts fire.. idles fine.. runs great. But carb back on motofino its rich..
I open motor up last night to re check timing.. all good.. 2 small holes line up with head.. big hole in center... everything looks good..
Here's another thing.. when I took the motor apart to install the bbk.. the old cylinder head had a ton of carbon in the combustion chamber built up as well as top of old piston..
Makes me think it's been rich for ever.. but why..
I just dont know..
I feel leaning it out with jet swap is the only way
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Post by GrumpyUnk on Oct 4, 2020 8:52:43 GMT -5
If you swap the whole induction system - from the air cleaner housing to the intake manifold from bike to bike, you will know if it is in the intake or the head/cylinder/crank/piston between the two. Could be the one has a more free flowing air cleaner/housing/etc, so leads to a better mix. Have you compared air cleaner gizzards and ports? I know that most have a rather small tube inside the cleaner, behind the port to atmosphere at the front of the assembly. I have removed a few, dunno if it makes a difference, but it sounds a bit more powerful. I just kinda like the change in intake noise, whethere it helps or not. Anyway, take both off and either compare or swap, note the difference. If there is none, then it must be within the engine - hard stuff as noted above. Ring seal? Piston actual compression ratio? Slight difference in crank throw, thus tiny bit of piston cycle length... little details. tom
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