coachb

I just purchased the bike and I'm trying to figure out what my problem may be. Other people have mentioned this may be a factor. I reaaly don't know. I guess that's why I'm on here looking for suggestions.

I guess the cone would actually be in the muffler part of the pipe. But some other forums speak of a restrictor in the inlet of the pipe where it attaches to the cylinder, I haven't went that far yet. They say a "washer " with a very small hole in it is there that can be cut out.

The baffle had 1 screw holding it. Remove it and shine a light down from there and you can see the cone. I cut the pipe with a band saw and removed the cone with a pair of vice grips. Then welded the pipe back together.

I removed the baffle and cone from inside, "opened it up". Several forums I've read people commented that due to EPA air regulations in the U.S. the exhausts were restricted inside. The air filter is new.

I did the compression test cold. And yes I'm in the states. Last night I stripped the carb and cleaned it. Looked pretty good inside. I also gutted the exhaust. Idles now but the screw is all the way in. Ran much better in 1,2,3 gears. Still seems sluggish in the upper gears. Ran out of time and called it quits for the evening. Will adjusting the slide needle help in the upper gears? There is a screw holding the plate on top of the needle that is being stubborn. I will take the carb aprt again and do a more detailed cleanig now that you have given me som edirection. Thanks for the photos. Darren

I dont know much history on the bike. The carb (without tearing it down) looked good inside where the slide is. Works freely also. What should the float height be? Or can you direct me to a sight where I can find carb specs? And also, what is a good compression (PSI) for it.

It's wierd really, you don't have to choke it when cold. Will start on 2nd or 3rd kick. When you rev it and it comes down to idle it will gradually idle down and quit. Idle screw is all the way in and doesn't effect it at all turning it out. Air filter looks new. Seems like 50 mph is top speed. Rpms arent out the roof.... just doesnt want to go any faster. About 30 years ago I had a Kawasaki 175 that seemed to have alot more zip to it than this bike. It didnt have a power band at all and felt stronger. I also checked the slide in the carb and its in correctly. Haven't torn it down for a cleanibg yet though.

I recently bought a 1981 DT175. Maybe I'm expecting too much but it seems to be down on power. I ran a compression check and 1st kick had 75psi, 2nd kick 85 3rd kick had 100psi. The bike wont idle and niether screw on the carb affects the idle or performance of the bike. It only had 1800 miles (if odometer is correct) on it. Should this bike have a power band . It doesnt seem to when get the rpm's up. Any advice would help. Thanks