Picked up a DT250 - Page 2

D.T. · 01-21-2012, 05:57 PM

$300 is a sweet deal if the motor is working.

I had a 1978 DT 125 growing up, it didn't have the same style paint so I'm wondering if that isn't a 1979 instead? My 125 had poor carburetion though, nasty flat spot around 4k rpm's I couldn't get rid of.

Mine looked like this one..

MightyChosen1 · 01-21-2012, 06:08 PM

Quote:

Originally Posted by D.T.

$300 is a sweet deal if the motor is working.

I had a 1978 DT 125 growing up, it didn't have the same style paint so I'm wondering if that isn't a 1979 instead? My 125 had poor carburetion though, nasty flat spot around 4k rpm's I couldn't get rid of.

Mine looked like this one..

I think that is the 79 paint scheme on that bike. My buddy in school had a 78 DT-125 in green and the tank looked like my 78 175.

My DT suffers from the same flat spot at 4000 RPMs, I have had the carb off at least 3 times and cant fiqure it out

D.T. · 01-21-2012, 06:14 PM

So mine could have been a 1979?

As far as the flat spot, couldn't you richen or lean the pilot jet or possibly change the needle position? I'd go richer first, like larger pilot jet or drop the needle one position.

Any more information on the history of the DT? Like models and years?

Out in the farmland growing up a kid had a red 175 just like the one above. My buddy had a XL185 Honda and we used to tear up the farm. Good times. Too bad my buddy died a few years ago in a car accident.

ADK · 01-21-2012, 08:50 PM

WWW.YAMAHAENDURO.COM

Shocktower · 01-22-2012, 12:30 AM

Nice steal hey parts speed and sport has tons of stuff

Shocktower · 01-22-2012, 12:34 AM

Quote:

Originally Posted by alfredman22

Well I suppose that would explain why the chain is always too loose or too tight then.

Ok I found the chain tensioner speed and sport inc has them just look them upthey have them

alfredman22 · 01-24-2012, 07:52 AM

Just checked the title, its actually a documented 1977 model with 4,065 miles not a 1978 like originally thought. My memory must be going

Checked out speed and sports, nice find. Man all those parts add up fast, over $130 and counting. Gonna check out yamahaenduro.com and see if i cant find a "gently pre-enjoyed tensioner."

What is the flat spot a 4,000 RPM? Sorry coming from a 170HP liter bike, this bike feels like one giant flat spot! Are we talking a studder, or just no power? Bike seems relatively smooth, just needs to be reved to make it anywhere.

mudgepondexpress · 01-25-2012, 07:04 AM

I live in Spokane WA, elevation between 1200 and 1500 ft. Ours ran really fat and thus felt flat many times when I first had it running on new stock sized jets. I ended up jetting is down 3 steps on the main (I went 1 at a time) and if memory serves me correct, dropped the needle 1 clip. It sure woke the bike up and mileage increased dramatically.

After the jetting is doesn't smoke much at all even under full throttle. You know its a 2 stroke but there isn't the trailing cloud of smoke.

What jets are in it?

Kernny

Birdmove · 01-25-2012, 07:57 PM

I had two Yamaha DT 250s. First, the first year model DT-1. These bikes were pretty much color coded with the 1968 being white. Then, later, I picked up a red 1972. Two of my best buds (class of 1972 now) had an AT-1 (125) and a CT-1 (175). I was pretty impressed with the spunky 175 engine. The 125s had electric start (why??).
The friend with the CT-! later bought an RT-360.

jon

alfredman22 · 01-26-2012, 05:13 AM

No idea what jets are in the carb, and its actually sleeping for the season in storage right now so no way to look. Must be jetted pretty well as there really was no noticeable two stoke smell at all. Thanks for all the help guys!

Jimbozini · 01-29-2012, 02:58 PM

Quote:

Originally Posted by D.T.

$300 is a sweet deal if the motor is working.

I had a 1978 DT 125 growing up, it didn't have the same style paint so I'm wondering if that isn't a 1979 instead? My 125 had poor carburetion though, nasty flat spot around 4k rpm's I couldn't get rid of.

Mine looked like this one..

That was my first bike! A 1979 DT125F.

01-21-2012, 05:57 PM	#16
D.T. One wheel wonder... Joined: Aug 2004 Location: Moneyapolis, MN Oddometer: 6,435	$300 is a sweet deal if the motor is working. I had a 1978 DT 125 growing up, it didn't have the same style paint so I'm wondering if that isn't a 1979 instead? My 125 had poor carburetion though, nasty flat spot around 4k rpm's I couldn't get rid of. Mine looked like this one.. Attached Images __________________ "Tough times don't last, but tough people do." Robert A. Schuler

01-21-2012, 06:14 PM	#18
D.T. One wheel wonder... Joined: Aug 2004 Location: Moneyapolis, MN Oddometer: 6,435	So mine could have been a 1979? As far as the flat spot, couldn't you richen or lean the pilot jet or possibly change the needle position? I'd go richer first, like larger pilot jet or drop the needle one position. Any more information on the history of the DT? Like models and years? Out in the farmland growing up a kid had a red 175 just like the one above. My buddy had a XL185 Honda and we used to tear up the farm. Good times. Too bad my buddy died a few years ago in a car accident. __________________ "Tough times don't last, but tough people do." Robert A. Schuler

01-22-2012, 12:30 AM	#20
Shocktower Beastly Adventurer Joined: Jul 2009 Location: Oregon City Orygun Oddometer: 8,314	Nice steal hey parts speed and sport has tons of stuff __________________ Alexa Drew Nov 9 1995- Oct 28th 2004 Miss you baby '08 KTM 530 EXC 79 RD 400 Daytona

01-25-2012, 07:57 PM	#24
Birdmove Beastly Adventurer Joined: Oct 2004 Location: Keaau, Hawaii Oddometer: 1,237	I had two Yamaha DT 250s. First, the first year model DT-1. These bikes were pretty much color coded with the 1968 being white. Then, later, I picked up a red 1972. Two of my best buds (class of 1972 now) had an AT-1 (125) and a CT-1 (175). I was pretty impressed with the spunky 175 engine. The 125s had electric start (why??). The friend with the CT-! later bought an RT-360. jon __________________ Jon in Keaau, Hi. USA 2008 SYM HD200 (wife's ride) 2009 Kymco People 150 and coming soon, another dual sport mc

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: .
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

01-21-2012, 08:50 PM	#19
ADK Bimble Fick Joined: Dec 2005 Oddometer: 7,764	WWW.YAMAHAENDURO.COM

01-24-2012, 07:52 AM	#22
alfredman22 ^OP Gnarly Adventurer Joined: Mar 2008 Location: rochester, ny Oddometer: 148	Just checked the title, its actually a documented 1977 model with 4,065 miles not a 1978 like originally thought. My memory must be going Checked out speed and sports, nice find. Man all those parts add up fast, over $130 and counting. Gonna check out yamahaenduro.com and see if i cant find a "gently pre-enjoyed tensioner." What is the flat spot a 4,000 RPM? Sorry coming from a 170HP liter bike, this bike feels like one giant flat spot! Are we talking a studder, or just no power? Bike seems relatively smooth, just needs to be reved to make it anywhere.

01-25-2012, 07:04 AM	#23
mudgepondexpress Beastly Adventurer Joined: Jan 2007 Location: Spokane, WA Oddometer: 1,115	I live in Spokane WA, elevation between 1200 and 1500 ft. Ours ran really fat and thus felt flat many times when I first had it running on new stock sized jets. I ended up jetting is down 3 steps on the main (I went 1 at a time) and if memory serves me correct, dropped the needle 1 clip. It sure woke the bike up and mileage increased dramatically. After the jetting is doesn't smoke much at all even under full throttle. You know its a 2 stroke but there isn't the trailing cloud of smoke. What jets are in it? Kernny

01-26-2012, 05:13 AM	#25
alfredman22 ^OP Gnarly Adventurer Joined: Mar 2008 Location: rochester, ny Oddometer: 148	No idea what jets are in the carb, and its actually sleeping for the season in storage right now so no way to look. Must be jetted pretty well as there really was no noticeable two stoke smell at all. Thanks for all the help guys!