ZXR bad fueling low RPM
Posted: Sun Apr 09, 2017 3:13 pm
Hey everyone,
I've recently had some problems with the ZXR400, it felt very boggy on WOT and didn't like to go above 6k RPM, but it would run decently in the lower RPM range.
Now I've had my carbs ultrasonically cleaned and now it feels wrong in the lower RPM range, needs loads of throttle to get off the line (I gave it throttle and slightly released the clutch to its biting point, this led to a drop in RPM but no feeling of torque), the bike struggles and it makes a sort of BRRRR sound when on the throttle hard. (I have a feeling it might be running on 3 cylinders in the low RPM range).
Above 6K RPM it goes great, screaming to 10K RPM which is what I believe the limiter because of my restriction.
When stood still the engine hangs at ~2000rpm a bit before dropping down to its idle speed.
We've had the carbs cleaned, we've have changed the sparkplugs, all of which were a nice coffee brown colour and we've changed the fuelfilter so far.
Any idea what this could be?
Also I must mention, the previous owner told me he and his mate restricted the bike by changing out the jets.
Thanks!
I've recently had some problems with the ZXR400, it felt very boggy on WOT and didn't like to go above 6k RPM, but it would run decently in the lower RPM range.
Now I've had my carbs ultrasonically cleaned and now it feels wrong in the lower RPM range, needs loads of throttle to get off the line (I gave it throttle and slightly released the clutch to its biting point, this led to a drop in RPM but no feeling of torque), the bike struggles and it makes a sort of BRRRR sound when on the throttle hard. (I have a feeling it might be running on 3 cylinders in the low RPM range).
Above 6K RPM it goes great, screaming to 10K RPM which is what I believe the limiter because of my restriction.
When stood still the engine hangs at ~2000rpm a bit before dropping down to its idle speed.
We've had the carbs cleaned, we've have changed the sparkplugs, all of which were a nice coffee brown colour and we've changed the fuelfilter so far.
Any idea what this could be?
Also I must mention, the previous owner told me he and his mate restricted the bike by changing out the jets.
Thanks!