Beef Supreme

i think i've just about got it , it runs up to redline and the plug looks pretty good . only thing thats still weird about it is when you rev it way up a tiny bit of gas trickles out the over flow , the float height is already 2mm below stock level so i can only assume the vibration of the engine up that high is vibrating the float valve open slightly . it doesn't leak a drop at low rpm or idle . not much i can do about that aside from putting a piece of hose over the overflow tube in the carb bowl to raise it up some , but i'd rather not . i'm running a 140 main now and it seem to like it a whole lot more . and as for timing there's a line on the flywheel and one on the case , you hit it with the strobe gun at 3k like the manual says , it was dead on .

i'm trying to get almost the same bike working , what does yours rev to wide open ?

ok , well today i got that restricter out of the exhaust , without a rotary tool . there was alot of chiseling and the plasma cutter took care of the bulk of the cutting . even tho it's badly out of tune i can already feel more oomph . i also checked the timing and it was dead on . it still doesn't rev up tho .

in the last few years of the dt the epa was busting down on 2 strokes , they made yamaha put a restrictor in the exhaust to limit power and emissions , here's a pic of the dt exhaust with and without the restrictor . some of the people that have the same bike as me on the dt forum said that theirs would only rev to 7.5k before they removed it , i figure at this point it can't hurt to try it , worst case i need to buy some new jets .

i got that needle jet out that you were talking about , it did have holes in it and they were all clogged up , sadly that still didn't fix the problem . maybe when my air filter and air box intake horn shows up it'll work better . i'm going to clean out the whole exhaust tomorrow and remove the stupid restrictor thats in it .

the air filter has been out today for just that reason . and it's falling apart , i don't want parts of it to get sucked in . a new one is on it's way ....as well as about $300 in other parts that hopefully wern't bought for nothing . i haven't tried timing it , but it's supposed to be cdi , normally you can't adjust timing on those .

well i couldn't see any way to get that out unless i put something up against it in the throat of the carb and hit it with something , it doesn't unscrew . the part that butts up to it and the main jet unscrew , but it looks like that part is just pushed into the carb and the rest of that stuff hold it in .

dt175 video there's a video of it . when i rebuilt the carb last time i noticed i didn't have the float at 21mm i had it at 22 , so thats where it should be now . but still , 7k in neutral , and 6k tops if i'm on the street . when you say the needle jet are you talking about the needle for the float , or the needle for the throttle slide . because i couldn't see any way to get the one for the throttle slide out , i took out the main jet , the part the main jet screws into , and then there was still a brass tube in the carb under all that . but i shined a light up in it and couldn't see any holes , it looked very clean but i ran a pipe cleaner thru it anyway , the hole isn't ovaled out .

i pulled the carb and pulled the reed block out , they look brand new and they're the metal kind , no missing hunks and they all flap back just fine so i rebuilt the carb again ,i'm running the stock 22.5 pilot and the stock 150 main , i reset the float height again just to see . went out and fired it up again .....still tops out at 7 . i don't think there's anything else i can check . the bike is 100% yet it's not 100% and thus is my off road bike curse , a problem that can't exist because everything is correct , yet it still exists . not one out of the 50 or more dirt bikes i've owned has ever worked right , it's always something . i'm starting to think i should swear off anything that's not meant for the road and just be done with it .

i just put everything back on and took it for a spin , it still only wants to pull 7k , tho when i pulled up back at the house for the hell of it i turned the gas off but left it running again . i kept revving it wide open , the first 2 or 3 times it got to 7 , the third and fourth time it got to 7.5 , and on the last rev before it ran out of gas i got it to 8 , maybe i should try lowering the float a little more and see if that does it . when i have the carb off i'll check the reeds , but i dunno why it would run prefectly up to 7k if there was a problem with the reeds but i've seen weirder stuff before . if anyone else has any other ideas feel free to chime in .

just for the hell of it i fired it up with the entire exhaust off , same deal , it would get to 7.5 and that was that , the exhaust port is fairly clean and the pipe doesn't seem to be blocked up ...i don't think the exhaust is the problem . ehhh , i'm really starting to get tired of this , every single bike i've ever had has always worked 90% because of some undiagnosable mystery problem that bugs the hell out of me untill i give up and sell it .

i just pulled the muffler off and besides being loud as hell i can now get it up to 7.5k rpm . i think i'm going to pull the whole exhaust and make sure it's clean ....i really hope this is it.

ok , well i just tried running it with the fuel off to see if it was still float height , it ran as usual untill it didn't have enough gas to keep going , so i don't think it's float height . then i came down the street as fast as i could , hit the kill switch and pulled the clutch and rolled back to my house , pulled the plug . it was a little wet but the tip was slightly tan . i haven't checked the reeds yet , i'm going to let the engine cool down some first . i think i'll also pull the exhaust off and make sure it isn't all blocked up near the head .

hey , i'm new here and i'm trying to get my 81 dt175 going 100% , but i'm having some issues . you can give it as much gas as you want and it does fine untill you hit 6k , then it just flutters there , does it in neutral or under load . i checked the float height and it was off so i set it to factory spec . the slide needle isn't adjustable , the autolube pump seems to be adjusted right (peg lines up with the dot) , all jets clean . once i'd done all that i could get it to go to 6.5k rpm and sometimes a little higher but it would start gurgling . then i thought hey , maybe the air cleaner isn't as clean as it looked , so i took it out and found the back side of it sopping with oil and pretty much falling apart . i removed it and i took it for a spin up the street and now i could get it up to 7k maybe a little higher but not up to the 8k red line so i'm guessing the clogged up old air filter had something to do with it (i have a new one on order) . but shouldn't i be able to get her up into the red (not that i plan on riding in the red , but theroetically shouldn't it be able to get there ? atleast to the 8 ? ) and if so what could be holding it up ? there's nothing else adjustable on here . compression is good and she starts first kick , idles great , the plug looks a little wet but the tip is somewhat tan . i just noticed that in the diagram for my air box there's a small snorkel that you set into the box before screwing the cover down and mine doesn't seem to have that ...that couldn't cause this could it ? i wouldn't think that an inch long plastic snorkel would make that much of a difference tho . anyone else have any ideas ? tomorrow i guess i'll check the reeds and make sure they're good . and i'll try running it with the fuel off to see if once the fuel level gets lower if it'll rev all the way up . if neither of those pan out i'll run it wide open up a hill and hit the kill switch and then check the plug . i know it's something dumb but i'm running out of ideas .