Suzuki DT4 (2-stroke) strange noise.
OK...how do I describe a strange noise??
Engine starts and runs fine, but if opened up past about 1/3 throttle, it starts making a horrible noise/vibration. Goes away when throttle closed.
A number of knowlegeable people have listened, and declared that it was most likely a problem with the main bearings.
I dismantled the engine, replaced the bearings and started it this morning.
I now get the impression that it could possibly be coming be from the lower leg, and suspected it was coming from a partially engaged gear. (It's that sort of noise....like in a car when you try and engage gear with the clutch not fully depressed)
Checked the rod adjustment, and tried the gearshift in various positions...no change.
Set it up in a big water tank, and tried it in gear. Prop turning fine, and same noise.
Has anyone experienced anything like this?