The MX 360 engines were definitely different that the DT Enduro engines because they had lighter flywheels and the piston use was a piston ported piston with the 2 ports in the intake side of the piston that changed how the transfer ports timing worked while the DT 360 engines didn't have this . Also the MX 360 engines pistons were a 1 ring piston to help reduce friction and it helps reduce the weight of the piston while the DT 360 used a 2 ring piston . All of this stuff used on the MX 360 engine made the engine rev quicker and pull harder. The MX 360 engine also had a close ratio transmission so the engine RPM wouldn't drop nearly as much between shifts to help keep the engine in its power band while the DT 360 Enduro had none of this . The frames were chrome molly on the MX so it was lighter but stronger while the DT Enduro used a mild steel frame that weighed more and had a tendency to crack and bend . Even the exhaust tuner pipe was different that the Enduro and was tuned specifically for the power band the MX engine had . I had a 74 MX 360 many years ago and that bike hauled the mail . I gave a kid I knew a ride home one day on it when he got off the school bus being he got let off about a 1/2 mile away from his parents house and back then our roads were all dirt gravel roads and I asked if he wanted a ride home and he said sure so I told him to jump on and hang on but take your cap off because it's not going to stay on which he did stuffing it under his t shirt and we took off and I fanned the clutch banging through the first 3 gears with the front wheel off the ground then hitting 4th & 5th and by the time we were at his parents house his eyes were beat red and his hair straight back and he said damn this bike is friking fast lol . A few years later I sold the bike to buy a car and hadn't seen him in 20 years until I seen him one day at a bar his girlfriend was bartending at and after talking to him he mentioned that ride I gave him home that day all those years later which surprised me being it was so long ago . Wish I still had the bike because they are rare now and go for quite a bit of money restored and in perfectly running condition. I have a 81 Honda XR 500R 4 stroke 4 valve head with a super trapp exhaust on it that has better suspension but that MX 360 would spank that 500s ass on acceleration and if I could swap the 500 for the 360 I would in a heart beat . The Honda has a more plush ride but it's heavier and sits higher so it's harder to flick it around or actually dig it low in tight corners compared to the MX 360 I noticed when riding the 500 .

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Hi, please, what year was your 125 bultaco?

is it the autolube oil tank?

Those were Anckront high shoulder rims or a version of them of them made by Yamaha back then . They were lighter than the steel rims used at the time and super strong as long as you kept the spokes tightened up and the rim trued. My 74 MX 360 had them many years ago when I had mine and I have a 75 Yamaha XS650 that's built as a street tacker that has the same rims on it . A street tacker is basically a flat track race bike that's legal to ride on the street that's stripped down and lightened up as much as possible but has a headlight and tail light and either just a speedometer or a tach to use to gauge you speeds plus it has Dot tires that look like flat track dirt racing tire but are legal to use on the street .