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Post by essayford on Mar 9, 2020 17:37:42 GMT -5
Hello scooter community.Do any of you know of an aftermarket performance CDI box that is compatible / will work on an 06' SYM DD50 scooter?? Thanks in advance.
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Post by Zino on Mar 9, 2020 18:03:52 GMT -5
I believe the stock sym cdi is unrestricted. I have seem them stock run close to 40 mph which usually the tip off they are not restricted. Before buying find a steep hill and go down it if your speed levels out instead of continuing to climb. If you have a tach you will see the rpms cut out around 7k rpms . partsforscooters probably is the place to start give them a call send them a picture member Dexameth on here works there and is very helpful. they have a discount code up rightnow 49ccscoot.proboards.com/thread/23280/partsforscooters-com-discount-codes |
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Post by benji on Mar 9, 2020 21:25:41 GMT -5
Zino18 is right, your OEM cdi is probably unrestricted, although the OEM ignition probably starts to break up between 10k-12k rpm Aftermarket cdis don't usually work well with 2stroke bikes. With these bikes, the power is in the exhaust pipe. Not cutting off the pipe, but getting a properly tuned pipe. 2strokes work off of resonant sound frequencies guiding the air/fuel mixture into the combustion chamber at the proper time. An expansion chamber style pipe is what you need, probably one for a dio would work. www.partsforscooters.com or scooter tuning are both excellent places to find aftermarket pipes. |
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Post by christopher on Mar 10, 2020 6:24:36 GMT -5
What are you trying to accomplish, aftermarket usually just remove the rev limiter if you even have one.
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Post by Kenho21 on Mar 10, 2020 7:31:05 GMT -5
Also, from most of what I've seen the "performance" CDI's tend to have the opposite effect or equal to stock at best.
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Post by 90GTVert on Mar 10, 2020 10:20:55 GMT -5
The easy way to look for a rev limiter for me has been to simply put the scoot on the stand and rev it. Don't just hold it wide open, but you can quickly see if it's cutting out at low RPM. The other very important thing to remember if doing this is to make sure the scoot is secure. You don't want to get that engine wound out and have it come down and take off on you. Also, let it warm up first or do it after a ride. If you happen to be servicing the CVT, you can do it easily if you have everything off of the crankshaft that's under the CVT cover without having to worry about spinning the tire.
Some scoots are speed limited too, but the hill test that Zino mentioned will tell you that part or you may find what looks a lot like an ignition pickup mounted near the clutch bell. Unfortunately I don't know if the SYM scoots were known for any of that, but it's not tough to find out with these checks.
You can absolutely get gains from ignition timing, but a lot of aftermarket replacement CDIs really don't do that much. Proper timing is even more beneficial with tuned exhausts so I'd agree with the above to consider a pipe or a big bore kit first unless you find that the CDI is truly restricted. Even then, research the CDI before buying. Very few CDIs actually have a good curve. A lot of the cheap ones are of unknown timing. They claim one thing and do another sometimes or they can just be stock CDIs in a fancy case. I usually just buy stock replacements for my scoots and so far I've owned 1 CDI that really had a good curve and it is part of an expensive racing ignition setup. The rest have been similar to stock or flat line "curves", though I haven't been buying them for your engine platform.
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