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Post by GrumpyUnk on Jul 25, 2021 7:47:45 GMT -5
I just remembered about the CDI with the 'exta' wire that was effectively an rpm limiter. Some have suggested that as a way to bypass the legal limits. Being ignorant of current CDI construction, if the limit lead was still used, routing it through a switch, appropriately hidden, could make passing a 'dyno' test relatively easy. Maybe finding a CDI with the limit circuit, installing that along with a switch would be a viable method to allow a bit of performance and passing. tom
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Post by blackpowder on Jul 25, 2021 18:15:25 GMT -5
Yup that would work, but thats where the remote comes in The cops being so interested in scooters have learned a little over the years. And have been known to look for a button. The remote controlled way is more difficult, but can go undetected, no matter how much time they wanna waste looking for one.
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Post by FrankenMech on Jul 25, 2021 18:45:04 GMT -5
My three wheel trike had an electronic rev limiter installed to limit speed when the front suspension was locked (two wheels in front). with the suspension locked it pushed REAL bad. It had an adjustment pot and was activated with a switch on the locking mechanism. I removed it and tossed it and so I never messed with the adjustment. There are probably similar parts available somewhere. There are remote activated switches also.
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Post by GrumpyUnk on Jul 26, 2021 8:08:41 GMT -5
Frank, I worked on a machine like yours a few years ago, a Dong Fang? Anyway, you may have a link to the parts list that may show the part number of the rev limiter you reference. I do not remember having one. I have not seen a rev limiter on any site so far, though have not really been looking. That machine also had a fuel pump operated by intake manifold pressure. I do not know how that works given that most times it would have little to no vacuum, so how does it make the pump work? Or am I wrong about the vacuum? I have a 'victoria' with a duplicate setup, tank under your feet, and it takes FOREVER cranking to get fuel to the carb if you let it sit for more than a few days. Is there a shortcut to that? Or does the DF not have that problem? tom
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Post by FrankenMech on Jul 26, 2021 11:36:44 GMT -5
It is a Dong Fang. DF is the only manufacturer that makes them. The front suspension makes them weak, heavy, and have a lot of drag (slow). I don't have any parts list. The vacuum fuel pump operates off the vacuum pulses from the intake. I use an electric pump in parallel to the vacuum pump to prime the fuel system. The Dong Fang company now has a direct import website that supposedly has parts lists. I don't think they will work with anyone that is not one of their dealers. I bought mine from an old out of business dealer so I seem to be SOL for any unique parts, -fabrication time. Rucks also have a tank underfoot so they must also use a vacuum pulse pump. The pumps seem to be commonly available. Due to meds and a few strokes I can not ride a two wheeler. I am expecting delivery of another three wheeler today, an adult 'senior' tricycle. I may make it into an Etrike LOL
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Post by snaker on Jul 26, 2021 12:12:59 GMT -5
The police have a portable dyno to test scooters here too. They had it at the local collage a couple of years ago. Testing all the mopeds! There are a few different adjustable rev limiter boxes available. The drawback is they limit revs, not speed. So with a CVT it's not so effective. If you limit the opening of the variator. This would restrict speed. Think restriction ring, but bigger. It would take about 10 minutes to remove. That's my thoughts as well. Controlling engine rpms is a pretty indirect method of controlling ground speed. There are some brands that apparently use a special driven pulley with a trigger pad similar to the ignition trigger on the flywheel. That could get a signal out to possibly govern the ignition specifically for ground speed. May also have done something with a speedometer. There are some threads floating around in this forum.
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Post by blackpowder on Jul 27, 2021 16:58:48 GMT -5
I found this cdi : It comes with a manual toggle switch, which makes it possible to change between two rpm settings. If this thing works, I would only need a remote modul that could run on 12v from the battery. Any particular modul I should look for ? Im not sure what the lowest rpm setting is on the cdi, because the description is in polish. So I will have to do some testing myself. progess none the less :-)
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Post by FrankenMech on Jul 27, 2021 17:20:27 GMT -5
Good find! Many car remote-start systems have accessory relays and outputs for controls.
The Dong Fang speed control ran off the timing pulse for the CDI. The little black box was probably custom but it looked similar to what you found. The pot was partially embedded in some sort of electronic potting compound and the adjustment screw was coated with a sealant. The Dong Fang unit was not a CDI and was mounted remotely in a hard to access area.
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Post by blackpowder on Jul 28, 2021 20:45:51 GMT -5
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Post by FrankenMech on Jul 28, 2021 22:29:41 GMT -5
looks like you get a standard N.O. output relay. I am sure 40A is more than enough.
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