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Post by fickertravis on Dec 7, 2012 20:32:12 GMT -5
Are these orange box cdi's that are going for 10-20 bucks shipped reliable? Are they "chipped" properly? Seems like a ridiculously good price at 10$ shipped . What's the timing advance on these orange boxes. Howdo they ddiffer from the others?
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Post by 90GTVert on Dec 8, 2012 0:55:43 GMT -5
Hard to know what you're getting. The one I got was basically a stock CDI. 190mech got one that never changed timing at all. Just stayed at base timing all of the time. I look at them as a good option if you have a rev limiter, otherwise, I leave them alone. Good to have for a spare to test with even if it doesn't do what you'd like for $10 though. I'd like to find a cheap CDI that had a really good curve for sure or was adjustable, without requiring building it from a kit or something. Best bet I know of for a cheap timing change is to mod the stator plate and advance the timing that way.
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Post by skuttadawg on Dec 8, 2012 1:39:49 GMT -5
Most have an unlimited CDI from the factory . I have heard many horror stories about Ebay generic junk . I would check out pfs or one of the other sponsors here as they would be more trustworthy . My 2T it would only run up to 8,000 RPMs and I thought it was a CDI restriction but in fact was limitation in the exhaust port and pipe . I did have a better takeoff but exact same top end . I put on a BBK with unrestricted exhaust and can hit 11,000 but try to not go over 9,000 RPMs You will need to know if your CDI is AC or DC before you buy one . Here is info www.scrappydogscooters.com/Tech_Talk_with_Mo_.html |
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Post by fickertravis on Dec 8, 2012 2:42:37 GMT -5
It's an AC cdi. It doesn't have a rev limiter and i thought about modifying the staor as it's not very difficult but i thought a cdi that had a specified advance timing would be easier. That's basically what this post was about though. Comparing places like pfs that carry one for 40$ plus shipping to something that is 10$ shipped. There obviously has to be a reason it's so much more.
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tvnacman
Scoot Enthusiast
Posts: 408
Location: NYC
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Post by tvnacman on Dec 8, 2012 9:06:06 GMT -5
Hard to know what you're getting. The one I got was basically a stock CDI. 190mech got one that never changed timing at all. Just stayed at base timing all of the time. I look at them as a good option if you have a rev limiter, otherwise, I leave them alone. Good to have for a spare to test with even if it doesn't do what you'd like for $10 though. I'd like to find a cheap CDI that had a really good curve for sure or was adjustable, without requiring building it from a kit or something. Best bet I know of for a cheap timing change is to mod the stator plate and advance the timing that way. I think I have what your looking for , I see you have done many video's . Its clear you know your way around the shop . Interested ? I intend to do some more testing with a timing light . Perhasps a video of the test would be a better selling point . John |
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Post by usmcdoc on Dec 8, 2012 9:45:10 GMT -5
Hard to know what you're getting. The one I got was basically a stock CDI. 190mech got one that never changed timing at all. Just stayed at base timing all of the time. I look at them as a good option if you have a rev limiter, otherwise, I leave them alone. Good to have for a spare to test with even if it doesn't do what you'd like for $10 though. I'd like to find a cheap CDI that had a really good curve for sure or was adjustable, without requiring building it from a kit or something. Best bet I know of for a cheap timing change is to mod the stator plate and advance the timing that way. Same here...have tried orange and blue CDI's on the QMB139 engines..saw no gain...and in fact when I tried the blue one on a stock engine and a BBK one..it ran worse..almost like they retarded the timing vice advanced it. Same with my Minarelli 2T performance CDI. So I 'slotted' the pickup mounting bracket on the QMB139's and adjusted them back a tad where I did notice a bit more pep. But as you know..it is linear that way..vice a curve...but still worked well. Now I am going to mod my Minarelli stator plate as well. |
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Post by 90GTVert on Dec 8, 2012 9:56:38 GMT -5
Oh yeah, sorry I had 2 strokes on the brain. For the GY6 I modded the pickup mounting holes to allow me to move it and advance timing. Also a simple and free mod (assuming you have basic tools).
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Post by usmcdoc on Dec 8, 2012 10:05:25 GMT -5
Oh yeah, sorry I had 2 strokes on the brain. For the GY6 I modded the pickup mounting holes to allow me to move it and advance timing. Also a simple and free mod (assuming you have basic tools). How did you do it on the Minarelli?.. That is next on my list since that is my ride....the Gy6 scoots are family members. Willing to bet you have a post or link on here..on how to do it...knowing you and as much kewl tinkering ya do..  |
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Post by 90GTVert on Dec 8, 2012 16:39:23 GMT -5
Here's a vid showing how I did it on the minarelli and what it accomplished. You'll see I elongated it to allow for retard as well, don't bother with that, and the mounts don't have to be so long. I could move mine way farther than I would ever need to. www.youtube.com/watch?v=3d8qHNNi5CA |
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Post by usmcdoc on Dec 8, 2012 18:12:51 GMT -5
Here's a vid showing how I did it on the minarelli and what it accomplished. You'll see I elongated it to allow for retard as well, don't bother with that, and the mounts don't have to be so long. I could move mine way farther than I would ever need to. www.youtube.com/watch?v=3d8qHNNi5CAYee haw! tx...knew you have a vid or go by That was how I planned on adjusting mine...I was just afraid to ruin a stator as they cost more to replace than just the GY6 pickup coil. So it appears that 20 degrees BTDC was the best... That was a stock 50 and mine is a Hoca 70 BBK..so I am sure there will be a slight difference..but it sure beats those 'Not so Plug N Play' orange or blue CDI's... :thumb: |
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Post by Fox on Dec 8, 2012 21:06:05 GMT -5
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Post by usmcdoc on Dec 8, 2012 21:35:23 GMT -5
Fox...now those do work..at least from the ones I have seen customers buy. Costly however. But sad part is...kids tweak them all the way up...cause more is better?  I test ride their scoot...set it for best performance....and yup...you guessed it...they get home and turn it all the way max..then complain again of poor performance.. :stumped: WTH though right...we were kids once and would have done the same thing.. |
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Post by Fox on Dec 9, 2012 2:44:47 GMT -5
WTH though right...we were kids once and would have done the same thing.. When I was a kid I watched and listened to the older guys that knew what they were talking about and did what they did but were talking about dirt bikes that had no CDI's. Contact points and condenser. I was fortunate enough to have neighbors with bikes that let me hang around while they wrenched. I handed them tools and they taught me how stuff works. I had a paper route and saved for months to get my first bike. It was such a big deal in my life words can't explain the feeling I had when I took ownership. I was so excited. A few months later I had a concussion and a broken collar bone. Go figure!@ LOL For you youngsters out there, you got it easy now with all the computer CDI's nowadays. Here's a vid showing what us old farts had to adjust ignition timing back in the day. We used a feeler gauge, a slotted screw hole and trial and error but once you got everything set just right it was wheelie time! The more cylinders you had the more intricate it became. |
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Post by usmcdoc on Dec 9, 2012 7:48:30 GMT -5
WTH though right...we were kids once and would have done the same thing.. When I was a kid I watched and listened to the older guys that knew what they were talking about and did what they did but were talking about dirt bikes that had no CDI's. Contact points and condenser. I was fortunate enough to have neighbors with bikes that let me hang around while they wrenched. I handed them tools and they taught me how stuff works. I had a paper route and saved for months to get my first bike. It was such a big deal in my life words can't explain the feeling I had when I took ownership. I was so excited. A few months later I had a concussion and a broken collar bone. Go figure!@ LOL For you youngsters out there, you got it easy now with all the computer CDI's nowadays. Here's a vid showing what us old farts had to adjust ignition timing back in the day. We used a feeler gauge, a slotted screw hole and trial and error but once you got everything set just right it was wheelie time! The more cylinders you had the more intricate it became. Fox..omg...did ya have to flash me back to...points and condensers? My first dirt bike had that...a Yamaha GT 80..and not only did ya have to set them..frequently it would sputter out on the trail..and ya had the clean the points with a tiny file....then reset them... When they went to CDI...I was boggled. Huh?..how does it run with out points? :stumped: |
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Post by prodigit on Dec 9, 2012 8:22:20 GMT -5
The CDI can somewhat correct (tard) the voltage spikes, but if the stator is set to spike too late, or if it's too early, not even the CDI can correct it; and there will always be losses. It's better to have the stator tuned correctly, even with CDI.
If not, there's always going to be losses somewhere.
Though the retarding of the spark also depends on the fuel type.
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I test ride their scoot...set it for best performance....and yup...you guessed it...they get home and turn it all the way max..then complain again of poor performance.. :stumped: WTH though right...we were kids once and would have done the same thing..