> All Gas No Brakes Wrote:
> Hey Rick, congrats on the new addition!
> I wanted to give you some information in regards to the compression
> check that you did. The factory compression ratio on these DTs is very
> low. I discovered this with a DT400 that I owned some years ago.
> Your DT250 came from factory with 6.7:1 compression.
> 6.7 x ~14.7 atmospheric pressure should give a reading of approximately
> 98.5 psi.
> In other words, your compression is healthy and spot on! These DTs are
> somewhat gutless(some of the old timers swear “DT” stands for
> “De-Tuned”), but still a lot of fun. An expansion chamber/porting/head
> work might satisfy your want for a little more grunt. The Yamaha-Enduros
> forum is a tremendous resource for these bikes.
> Take care and stay safe!
I owned DT 125, 175 and 250s, underpowered compared to Kawasaki and other brand enduro bikes but more suspension travel especially the late 70s early 80s models so a lot of fun on trails.
At around 16-18 hp it may seem gutless like it needs a rebuild especially if you’re used to riding other Japanese brands of 250 enduros that make more hp but that’s normal. 8k km’s is not that many kilometers so if the piston is not that scored up maybe just put a new set on rings and gaskets on it since you got it apart and run it,
If you don’t have complete air box, filter and rubber snorkel or some dummy drilled holes in it or air box then you need to re jet or replace missing or modded parts to get back lost power