need help cdi fault? *need a engineer head*
Posted: Thu Oct 11, 2012 1:48 am
hi i have a cbr400rr nc29 1990 i broke down a while back and have never really found the problem, while driving the bike cut out and decided not to start again until the next day it started fine with out a problem,
from then on the bike has never run at it original rpm of 1300/1200 rpm, and now all it wants to run at is 1600rpm thats the lowest it will go the idle seems very slow as if the bike wants to stall.
I have done the valve clearances, balanced and cleaned and sealed the carbs, check every connector for wear,check resistant in every place possible, volts check every bit of wiring loom for splits breaks in wires and resistance back to the ecu everything is sound, checked primary and secondary coil pack resistance, check ht lead the whole lot everything has been done properly, no air leaks no blocked jet nothing, pick up resistance is fine, cleaned and oiled the air filter, change the spark plugs, fuel filter, made sure the fuel pumps working, all good
but the bike still wants to run at 1600rpm, but its hard to explain just by words but at 1600rpm the bike sounds like its idle extremely slow, and not in control of its idle and when it wants to it will just cut out and die, but it will start back up again.
The idle sounds great at 2000rpm perfect as if it was running at its correct idling speed of 1300rpm, there is spark but it is extremely weak, doesn't even have that pinging sound you would normally hear from the spark, even when i rev the bike up it seems to get a little strong but not to what the spark should be like, the bike does rev through out the whole of the rev range extremely well in neutral, i have not drove the bike recently because it was quite difficult to change gear while riding at what seemed to be a steady idle of 2000 rpm,
but while riding at a idle of 2000 rpm i had this problem, each thousand rpm used to be 10 mph, so for example i would be sitting at 30mph and the bike would be reving at 3000 rpm or 50 mph 5000rpm, think you get the drift of what i mean, well now instead when im doing 30 mph it is now reving at 4000rpm or 4500rpm always 1000rpm higher then what it used to be,
I have not changed any parts everything is still the same as before when it was running fine.
Thanks for reading my life story guys any information will be much useful to me
from then on the bike has never run at it original rpm of 1300/1200 rpm, and now all it wants to run at is 1600rpm thats the lowest it will go the idle seems very slow as if the bike wants to stall.
I have done the valve clearances, balanced and cleaned and sealed the carbs, check every connector for wear,check resistant in every place possible, volts check every bit of wiring loom for splits breaks in wires and resistance back to the ecu everything is sound, checked primary and secondary coil pack resistance, check ht lead the whole lot everything has been done properly, no air leaks no blocked jet nothing, pick up resistance is fine, cleaned and oiled the air filter, change the spark plugs, fuel filter, made sure the fuel pumps working, all good
but the bike still wants to run at 1600rpm, but its hard to explain just by words but at 1600rpm the bike sounds like its idle extremely slow, and not in control of its idle and when it wants to it will just cut out and die, but it will start back up again.
The idle sounds great at 2000rpm perfect as if it was running at its correct idling speed of 1300rpm, there is spark but it is extremely weak, doesn't even have that pinging sound you would normally hear from the spark, even when i rev the bike up it seems to get a little strong but not to what the spark should be like, the bike does rev through out the whole of the rev range extremely well in neutral, i have not drove the bike recently because it was quite difficult to change gear while riding at what seemed to be a steady idle of 2000 rpm,
but while riding at a idle of 2000 rpm i had this problem, each thousand rpm used to be 10 mph, so for example i would be sitting at 30mph and the bike would be reving at 3000 rpm or 50 mph 5000rpm, think you get the drift of what i mean, well now instead when im doing 30 mph it is now reving at 4000rpm or 4500rpm always 1000rpm higher then what it used to be,
I have not changed any parts everything is still the same as before when it was running fine.
Thanks for reading my life story guys any information will be much useful to me
i am very sorry. Like i said it wasn't set to send the replied to my emails so i did not notice, i was looking at my emails every day, never thought to check the site as i thought it would tell me i had replies via email