Yamaha DT175 help

**RDjase** · 28th July 2010, 18:57

Originally Posted by Nick JD

I just removed the exhaust restriction in my '99 DT 175 and it also runds like a pig (really spluttery) at really low throttle openings - but sweet at all others (idle, half, full). It feels like it almost doubled the power.

Raising and lowering the jet needle doesn't fix the roughness - neither does adjusting the idle screw.

Carver - was yours running fine at 60km/h in 6th with a slightly open throttle after your adjustments?

Any help would be much appreciated.

Have you got any pics of your DT?

I have a 1979 DT175 (early single shock model) and didnt know they made them 20 years later.
mine goes well, Could have a look at what jetting etc my early one runs

PS this is a old thread, Carver had his DT in 2005

**Nick JD** · 28th July 2010, 19:27

Originally Posted by RDjase

Have you got any pics of your DT?

I have a 1979 DT175 (early single shock model) and didnt know they made them 20 years later.
mine goes well, Could have a look at what jetting etc my early one runs

PS this is a old thread, Carver had his DT in 2005

I thought it'd be better to keep it in the same thread since it's exactly the same problem, and maybe others who also find this thread might get the answer I'm looking for - if I can find it

Mine's a 1999 model that's mint (4000km) and I've raised and lowered the jet needle too many times to count trying to find the best position that doesn't lean the plug out, but I'm wondering if it's actually the slide (just off idle is the problem), not the jet.

Carver says he simply adjusted the idle screw to fix it, but I'm not having the same luck.

I'd be stoked if you could get back with some jetting (or anyone else) info, because I'm not far off trying a new carb.

Question is: everyone with a DT175 must have derestricted it, but I can't for the life of me find any info on what people have done to their jetting. It's the same bit in all the exhausts, so it should require the same carb changes ... you'd think.

DT owners! How did you get your bikes to run well?

http://i841.photobucket.com/albums/z...o/IMG_0215.jpg

**Nick JD** · 30th July 2010, 14:23

I just moved the jet needle clip up to the second to top notch and it runs much, much better - so now I need to keep an eye on the spark plug's colour over the next few km just to make sure.

If I post a picture of the plug here can any 2-stroke gurus give me a yell as to whether I've leaned it out too much? This is my first two-stroke (Japanese sportsbikes last 20 years) and it's little engine is a virgin ... I really don't want to melt it.

**rok-the-boat** · 31st July 2010, 21:24

I had one of those 20 + years ago. I can't believe they are still making them. Back then, it was probably the best all round on/off roader.

**Kickaha** · 31st July 2010, 23:03

Oh yeah, the fun we had with a DT175

**RDjase** · 1st August 2010, 19:06

Originally Posted by Nick JD

I just moved the jet needle clip up to the second to top notch and it runs much, much better - so now I need to keep an eye on the spark plug's colour over the next few km just to make sure.

If I post a picture of the plug here can any 2-stroke gurus give me a yell as to whether I've leaned it out too much? This is my first two-stroke (Japanese sportsbikes last 20 years) and it's little engine is a virgin ... I really don't want to melt it.

Took the carb off my DT today, 1979 model

160 main jet

20 Pilot jet

1.5 Slide cutaway

4J6 Needle

267 0-8 Needle jet/holder/Emulision tube?

VM28 round slide, 3U5 00 code on it

The needle clip was on the top position, leanest, will put back to the centre position as its a mongrol cold, never had the carb off the old girl, was chocka full off crap in the Needle jet