Re: Suzuki DT 75 Low RPM's at full throttle.
You probably did, but a moderator moved your other one and then removed it. That is my guess anyway.
Check to make sure the timing is advancing properly like the spec call for.
If compression is good on all cylinders( it is best to give the #s on the post) and the spark on all cylinders and timing is good at problem RPM then you are more than likely having a fuel problem.( timing light will show spark on individual cylinders along with timing)
Check fuel pressure and vacuum to make sure there is not a supply problem with a fuel pressure/vacuum gauge.Look under frequently asked questions for a good explanation
If all that is good Then check by spraying a fuel mix into the individual carbs while problem is happening.
If you are trying to do this out of the water or in neutral that maybe your problem .
Some motor have safeties to keep from over revving the motor out of gear.
Just keep in mind too much fuel as well as too little will cause a cylinder not to fire properly and limit RPM under load. Some safeties limit RPM by retarding the timing, not sure about yours. A service manual will help you greatly