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  1. #11  
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    To illustrate the difference a good performance CDI can make, take my Skyteam ST110-6 (Honda Dax or CT70 replica), with a 107cc Lifan engine. It has been uprated with a 22mm carb, free air filter and exhaust, cylinder head breather, and rear suspension.
    I have tried two types of CDI on it: The first one just removes the RPM limiter, and therefore of little use in normal circumstances. Just allows you to rev a bit higher in the intermediate gears. The second one did improve things a bit, like a little higher top speed and better throttle response, but the third one is quite incredible. The engine just howls away after passing the half revs mark and accelerates a lot better. Even the sound has changed, it's now sharper with a spine tingling tone. The only proviso is that It's wise to use a higher grade of petrol. I'm using 98 grade now. There's a danger of pinking or pre-ignition with the more advanced timing curve.

    Got it from here:

    http://xian.west-wire.co.uk/index.ph...od&productId=3

    Looks like this. The make is POSH. This make has a very good reputation:





    This is where it fits on the bike, just wedged in next to the battery:



    This is the bike. I've put original Honda stickers on it to stop people asking me "what make is that". The amount of attention it gets, considering it's a 35 year-old design is incredible:

    Jincheng Monkey JC50Q-7
    Skyteam Dax replica ST110-6
    Zongshen ZS125-43
    Qingqi QM200GY-BA Super Motard
    Qingqi QM110GY
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  2. #12  
    C-Moto Regular Luis Carlos's Avatar
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    Quote Originally Posted by forchetto View Post
    I'm quoting myself here, but deep down I KNEW I was pissing against the wind...this is the reply I received today:

    "Hello Ernesto.
    We do not want to introduce a new product for Sundown STX200. In Brazil
    there are few owners of this model of Sundown.
    We appreciate your contact and interest in our products.
    Regards,

    Eng. Elet. Marcelo José Rodrigues
    Departamento de Engenharia
    e-mail: engenharia@servitecmoto.com.br"

    "Few" owners of the STX Sundown, when they have a factory in Brazil?, are they aware of all the other names these bikes are sold with all over the world?. Would Sundown have published such an expensive service manual to sell just a "few" of these bikes?. The potential market must be considerable. As manufacturers they should know. Agree?.
    Response of servitec:
    Luis Carlos hello, hello Vanessa.

    Although the model 200cc Sundown be marketed by a motorcycle world, we have commercial access only to the domestic market, since we have no official representatives outside Brazil.
    So with only the domestic market is not commercially viable to introduce a product as required. Macional estimated market of more than 10 pieces / year for this product.

    Furthermore the product 50.100.05 may be used in STX200 the ignition coil of STX200 is changed and if 50.100.05 is updated to synchronize properly with STX. We can develop this update, but not now because the priorities of engineering.

    Regards,

    Eleta Eng. Marcelo José Rodrigues
    Department of Engineering
    e-mail: engenharia@servitecmoto.com.br
    Phone / Fax: (54) 3224.2299

    Servitec Electronics Industry Ltda.


    • Programming via computer, online (requires Servitec 50.111.30 communication cable not included);
    • Curve-point adjustable according to the rotation and position of the accelerator (the bike must have the TPS sensor);
    • Limiting the rotation fully programmable;
    • Exchange between two different schedules via the handlebar CTR, even with the engine running;
    • Configurable output for tachometer or shift-light;
    • Entry of block configurable;
    • Correction of the point of temperature (requires sensor not included);
    Sundown 200cc STX motard
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  3. #13  
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    Brilliant work Luiscarlos. Thanks once again. I thought that one of the adapters on the photo would suit the STX (the bottom one).

    It's a real shame they don't seek representatives in other countries, they appear to be professional and technically competent.
    The silly thing is that these days with things like the Internet, you don't really need representatives. Lots of companies trade worldwide with just a good website that can be found by Google enquiries and some Google ads placing. If they just got a Google ad account with a few well-chosen words, anyone making an enquiry would soon find them.
    Jincheng Monkey JC50Q-7
    Skyteam Dax replica ST110-6
    Zongshen ZS125-43
    Qingqi QM200GY-BA Super Motard
    Qingqi QM110GY
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  4. #14 Performance CDI unit for Qingqi QM200 (Qlink, STX, etc) 
    Honorary C-Moto Guru
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    Gareth, from Xian Racing, tells me that he's not only sending me one uprated CDI free for trials on the Qingqi, but TWO units. It seems he has convinced another Far East manufacturer to develop one as well. So there you have it, two different Far Eastern manufacturers that at least try to seek out new markets and listen to what customers want.

    Not having access to a rolling road dynamometer or anything like that, and not wanting to give them a vague report on the performance improvements (if any), does anybody know of a way to measure the performance in an objective and repeatable manner?.
    Jincheng Monkey JC50Q-7
    Skyteam Dax replica ST110-6
    Zongshen ZS125-43
    Qingqi QM200GY-BA Super Motard
    Qingqi QM110GY
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  5. #15  
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    Quote Originally Posted by forchetto View Post
    Gareth, from Xian Racing, tells me that he's not only sending me one uprated CDI free for trials on the Qingqi, but TWO units. It seems he has convinced another Far East manufacturer to develop one as well. So there you have it, two different Far Eastern manufacturers that at least try to seek out new markets and listen to what customers want.

    Not having access to a rolling road dynamometer or anything like that, and not wanting to give them a vague report on the performance improvements (if any), does anybody know of a way to measure the performance in an objective and repeatable manner?.
    Thats AWESOME forchetto!!! Let me know the results after you test them out...I am interested in getting one!
    Qlink XF200 Flat Black MODS: P&P Exhaust Pipe-125 Main Jet-35 Idle Jet-Jet Needle Clip On Forth From Top Position-Denso Iridium Spark Plug IX24-Sprocket Specialists #550-16 16T Front Sprocket-SAI Removed-Rear Fender Cut Off-Brake Light Flasher-55 Watt Headlight Bulb
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  6. #16  
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    I'm hoping someone can suggest a way of testing the units so that the results are not just subjective. If no one suggests a better way I considered using the method that poster FROG on Chinariders.net has used. This are his comments on a POSH brand CDI fitted to his LIFAN 200GY-5 and his testing method and results:

    First impressions are good! Starting has not been adversely affected and immediately the changed engine note is noticable - bike sounds and feels less 'soft' than it did. Driveability is definately improved - this has got rid of a flat spot in the rev range I did not really know I had - bike revs more cleanly through out the rev range and pick up is noticably better. I think it is faster or at the least easier to drive faster.

    Had a chance to do some testing this lunch hour.

    Conditions:
    Lifan GY5 200cc
    level road
    no wind
    heavy rider
    standing start in first gear
    Measured half kilometer (GPS measured)
    17/46 sprocket set up

    Test method:
    dictaphone in jacket top pocket. Beep horn on start and when crossing finishing point - use stop-watch later to time between beeps

    Several runs in both directions

    Times with original CDI - 27.50 to 28.72 secs
    Times with POSH CDI - 24.32 to 25.44 Secs

    So probably around a 12% improvement. ( I would expect this to be greater over a shorter distance) as I do not think top speeds were that much different - but you get there quicker with the new CDI.

    I have to say I was not thoroughly thrashing the bike but acceleration was a lot harder than I would normally use in day to day riding. Main benefit to me is the cleaner pick up and nippier feel to the new CDI. People with less mechanical sympathy may get a bigger difference.........

    I may repeat this Testing over a shorter run - say a standing start 1/4 mile a la drag racing............


    Last edited by forchetto; 04-22-2009 at 07:02 PM.
    Jincheng Monkey JC50Q-7
    Skyteam Dax replica ST110-6
    Zongshen ZS125-43
    Qingqi QM200GY-BA Super Motard
    Qingqi QM110GY
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  7. #17  
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    Only thing I can think of to test Horsepower and torque is a motorcycle dyno but I am not sure if you have access to one. We have alot of them in bike shops over here is the USA.
    Qlink XF200 Flat Black MODS: P&P Exhaust Pipe-125 Main Jet-35 Idle Jet-Jet Needle Clip On Forth From Top Position-Denso Iridium Spark Plug IX24-Sprocket Specialists #550-16 16T Front Sprocket-SAI Removed-Rear Fender Cut Off-Brake Light Flasher-55 Watt Headlight Bulb
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  8. #18  
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    Warning: Extremely boring post...


    My English and Chinese friends have hit a problem with the CDI units for the Qingqi. It seems that they're not a CDI at all, whatever they call them in the manuals or parts lists. They're in fact "Inductive discharge Ignition". This means that there's no exciter coil in the generator, which is not a "magneto" like lots of other Chinese bikes, but a proper 3-phase alternator.

    Rather than relying on an exciter coil generating a highish AC voltage, rectifying it and then charging a capacitor with it, to be discharged across the HT coil by a pulse signal applied to a Thyristor, this system just takes 12 volts from the bike's system and applies to the coil primary winding through a semiconductor, probably a MOS-FET or an IGBT type transistor. The pulse coil signal acts to interrupt that primary current by switching off the transistor very rapidly, inducing a high voltage in the coils secondary winding.

    The advantages of this system is that the longer duration of the spark (2000 microseconds compared with 600 for the CDI), and greater spark energy (50 milijoules compared with 10), makes for a better system to fire weaker mixtures and reduce pollution. It seems that only bikes on the cheaper end of the market persist on using CDI (Capacitor discharge Ignition) nowadays.

    This means they'll be a delay in creating an alternative performance unit for our bikes, until they can fathom out how to copy and improve an original.

    This type of ignition box is better termed an "Ignitor" or "igniter".
    Jincheng Monkey JC50Q-7
    Skyteam Dax replica ST110-6
    Zongshen ZS125-43
    Qingqi QM200GY-BA Super Motard
    Qingqi QM110GY
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  9. #19 Performance CDI for Qingqi QM200GY (Qlink XF200, STX, etc) 
    Honorary C-Moto Guru
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    Following many months of development and the testing of various prototypes, Xian racing can now offer the first ever uprated performance CDI (igniter) available for our bikes.


    Suppliers of performance CDI or any other alternative parts for relatively low volume bikes like ours are virtually non-existent,low volume because they're sold under 22 different trade names so far!, if you added up all the sales of different brands worldwide it would amount to a quantity that would make it worthwhile for after-market parts to be made.

    Thanks to the perserverance of Gareth from Xian Racing to persuade their suppliers of other performance CDI units to develop and make a unit suitable for our bikes, and to me bending his ear to get one made... they can now offer a unit at a price that is more or less the same as the standard factory unit.

    This is very good value for that type of ignition unit. These igniters are
    considerably more complex than the usual CDI magneto-driven units, and sell for around $125-200 (when they're available!). A similar unit for my PGO mini buggy cost $150.

    The cost is £39.99 +postage. This is about $65.00 which is very good value in my opinion.

    I've had a prototype unit on long term test now for some months and can report that it's reliable, doesn't affect cold starting like some units do due to their over-advanced ignition setting, and perks up performance in the 4 to 8000 RPM range. The roll-on acceleration from mid-revs is noticeably better and so is hill-climbing and cruising speed. The engine copes better with adverse conditions on the open road, like hills and head winds.

    The factory rev-limit has been removed and moved much higher up.This is of interest to those that want to do further tuning and need a higher rev limit.

    The fitting is incredibly simple. Double sided tape or velcro strips fix it to the rear mudguard and an OEM-style connector on flying leads connects it to the wiring loom without any mods.

    The standard unit doesn't have to be removed as there's plenty of space there for both of them. This means in effect that you carry dual ignition units on the bike. It only takes seconds to swap the connector from one unit to the other. This gives some security and peace of mind.



    I have to add that I have nothing to gain financially from this. Gareth is a friend and an honest, approachable and reliable supplier of various bits and pieces for my stable of Chinese bikes.

    My reward has been to see such a unit being developed and made available where there was none, and a prototype unit supplied free of charge.

    The unit can be seen here. It will fit both 125 and 200 cc variants of these Suzuki-derived engines on bikes sold with any of these brands:

    QINGQI QM200GY
    QLINK XF200
    STX 200 Sundown.
    Pulse Adrenaline 125 (XF125GY-2B)
    Sinnis Apache QM200GY
    Superbyke RMR200
    Pioneer XF200GY-B
    Konker KSM200
    QMT200
    GXT Euromot
    Sinski Motard 200R
    Genesis GXT200 B
    KMF
    I-moto Tiger sm 125
    Ramzey QM200GY
    YUKI 250 SM
    QINGQI DRAGON 200 SUPERMOTO
    Hooper 125 SMR
    PIONEER monodust XF125T
    Kreidler Supermoto 125 DD
    Arqin motorcycles RT200SM
    TMS Supermotard 200cc
    SkyMoto Dragon-200
    Matador 200
    Viper 200
    Jincheng Monkey JC50Q-7
    Skyteam Dax replica ST110-6
    Zongshen ZS125-43
    Qingqi QM200GY-BA Super Motard
    Qingqi QM110GY
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  10. #20 Re: Performance CDI for Qingqi QM200GY (Qlink XF200, STX, etc) 
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    I'll be grabbing one of these for sure!
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