CDI unit question

[lee125]

on my 93 nsr 125r the spark is rubbish and it wont start off the electric start and it takes ages to bump off could it be the cdi causing the rubbish spark or is it more to do with the ignition coil but if it was the cdi causing the rubbish spark wouldnt the rest of the electrics be rubish and not work properly please help as im unsure cheers and also the spark plug is like a sutty carbon colour

[alains]

how can you say that your spark is rubbish ?
all ignition probs come from a lack of maintenance :
- worn plug
- clogged or dirty carb
- oil pump not adjusted
- dirty air filter
and rarely worn plug cap or ignition coil . also a bad process of starting .
i suggest : clean tank (fuel line) , air foam filter , carb , fit a BR9EIX plug . check the ignition as shown in my file https://www.geneva-racing.com/~alains/NSRtips.doc
to start :
- choke on , no acceleration
- start , let it run until it begin to stuff
- put a bit of acceleration (around 2000 rpm) and take choke off
- let it like that for 2-3 mn
then your engine must stay à 1400 rpm (+- 100)
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[Kickstart]

Hi

To go with the above, what condition is the battery in?

While a cdi unit can fail like that, more often they just stop working altogether.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[lee125]

hi i took my bike round to my local mechanic and he has told me it is to do with the generator that 1 of the coils needs to be re-done so it is being sent off today i should have it back on tuesday or wednesday

[lee125]

and also i had already cleaned the carb and got a new plug checked the ignition coil and cleaned the petrol tank filter in the tap cheers and also the air filter

[alains]

in case i've got here 2 stators (1 is nearly new) if you've got prob , send me a pm (it can be delivered within a week)
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the worst day fishing is better than the best day working

[lee125]

i got my generator thing back today after the ignition bits had been re-done and the spark is better but the bike still wont fire up and the carb has just been cleaned so petrol is getting there and the bike is sparking so i dont know wot could be causing this please help

[NSR Mick]

Bad compression? Is it due a rebuild?
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If you dont like the way that I ride.......Stop trying to keep up!!!

[bish777]

check in this order:

Battery
Coil
alternator
Ignitor (often wrongly called the CDI)

most likely you've got a shagged battery-if the battery is marginal, the draw of the started will drop the voltage enough to make the ignition box malfunction.
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GSXR1100J

[lee125]

how can you test if the compression is rubbish as i dont have a gauge

[lee125]

how do you check if the battery is nackered

[bish777]

[lee125]

hi i checked the compression and it was fine and the battery is fully charged so i got a new spark plug b4 and it was sparking brilliant so i put it together on the bike but when i try using the electric start it doesnt start but if you bump it it starts but its not reving properly it slowly revs to 7000rpm then wont go any higher thenit just dies and then if u try 2 start it with the electric start it almost fires up but then wont i think it might b the choke cable sticking but im not sure could that cause this cheers

[lee125]

found out its not the choke cable sticking i dont think its getting fuel to the cylinder but i have cleaned the fuel line and the carb any ideas wot else could be causing the petrol not to get to the engine cheers

[NSR Mick]

Blockage from the tank, does the fuel flow from the tap ok?
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If you dont like the way that I ride.......Stop trying to keep up!!!

[lee125]

yeah the fuel flows out fine

[bish777]

[lee125]

the battery is reading around 12.7

[meooo]

Check the fuse/fuse holder......my sons nsr had probs starting/running & electrical probs recently & the fuse holder and cables had parted company (corroded) new fuse & holder fixed in 5 mins.......could be you spark problem too.