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1974 Yamaha dt250 Enduro #4745474
05/02/18 11:08 AM
05/02/18 11:08 AM
Joined: Apr 2018
Posts: 1
MI
Richwood Offline OP
Richwood  Offline OP
Joined: Apr 2018
Posts: 1
MI
I was gifted this bike in original state but has not been played since '86 and ORV since '88. Kick start still moves and there's surprisingly no leaks of fluids anywhere. My question is, what oils do I need to start getting it ready to be fired up again?!
Thanks

Re: 1974 Yamaha dt250 Enduro [Re: Richwood] #4745484
05/02/18 11:19 AM
05/02/18 11:19 AM
Joined: Sep 2014
Posts: 2,193
US-WA
Dyusik Offline
Dyusik  Offline
Joined: Sep 2014
Posts: 2,193
US-WA
I'd throw some kind of lube in the spark plug holes before anything. Drain everything, fill fresh, check the wires for oxide, clean the carb out, and try to start it. If it worked when parked, really these are the only things that will prevent it from starting and running just like it did the day you parked it.


95 Cherokee 190K DELO 10W30, XG8
07 IS250 104K STP syn HM 10w30, FULL
04 YZF-R1 19K DELO 15w40, XG7317
99 HD XL1200S 21K VR1 20w50, NG1515
14 RX450h 37k Idemitsu 0w20, 57047
Re: 1974 Yamaha dt250 Enduro [Re: Richwood] #4745504
05/02/18 11:36 AM
05/02/18 11:36 AM
Joined: Jan 2018
Posts: 101
Iowa, United States
KMJ1992 Offline
KMJ1992  Offline
Joined: Jan 2018
Posts: 101
Iowa, United States
Check the specs for oil, as old as it is it probably calls for 30w. I helped a friend fix one of those once, but a 350 i think. It was 2cyl and syncing the carbs was a biznatch. I use Valvoline 10w30 4 stroke oil in all my small engines. Does its job and i get it cheap at the local farm and home store. Its good for wet clutches if that has one. We didnt have to rip the motor apart on the 350, just fix the carbs, hoses, and wires.

Re: 1974 Yamaha dt250 Enduro [Re: Richwood] #4745538
05/02/18 12:31 PM
05/02/18 12:31 PM
Joined: Aug 2008
Posts: 3,266
Where the wind comes sweepin'
Reddy45 Offline
Reddy45  Offline
Joined: Aug 2008
Posts: 3,266
Where the wind comes sweepin'
The OP's bike is a 2 stroke engine so a 4T oil wouldn't be the right suggestion.

OP: https://ultimatemotorcycling.com/2015/05/25/two-stroke-oil-whats-best-for-modern-2t-dirt-bikes/

Re: 1974 Yamaha dt250 Enduro [Re: Richwood] #4745561
05/02/18 12:55 PM
05/02/18 12:55 PM
Joined: Mar 2012
Posts: 96
RDM Oregon
dinkydau Offline
dinkydau  Offline
Joined: Mar 2012
Posts: 96
RDM Oregon
It is a two stroke so make sure the injector tank is full of two stroke oil. Access under seat.Gear box/clutch should take 30wt. oil. Haven't seen a set of thermal flow shocks in ages!
Enjoy the your new ride.

Re: 1974 Yamaha dt250 Enduro [Re: Richwood] #4745566
05/02/18 01:00 PM
05/02/18 01:00 PM
Joined: Dec 2016
Posts: 2,259
MURICA
maverickfhs Offline
maverickfhs  Offline
Joined: Dec 2016
Posts: 2,259
MURICA
I LIKE these bikes, 2T is a bonus wink


2006 Civic EX 205K/AT
2006 Acura TSX 187K/AT
Re: 1974 Yamaha dt250 Enduro [Re: Richwood] #4745592
05/02/18 01:21 PM
05/02/18 01:21 PM
Joined: Dec 2006
Posts: 4,224
Port Orange, Florida
Panzerman Offline
Panzerman  Offline
Joined: Dec 2006
Posts: 4,224
Port Orange, Florida
I love these bikes. I have two. These are the true apocalypse motorcycles. 10w30 in the crankcase. Any oil will work. Doesn't matter if it's wet clutch compatible. The wet part is what's important not the oil. I put 10w30 conventional in mine. I would premix the gas but wouldn't worry about anything in the spark plugs hole. They have oil injection but it was a ancient design and not a really good one due to it's hooked to the throttle. Alot if these siezed because if your flying down the highway let off the gas no more oil to a high revving engine.
I unhooked the oil injection blocked off the oil feed into the crankcase and mix the oil 32:1 using a semi synthetic two stroke TC rated oil. I very had my little Yammies for over 5 years and they are a barrel of fun because they so little and wicked.
Lots of fun. I get more comments on my Yanaha DT at bike week then $20,000 Harley's. I love it.



2006 Dodge Ram 2500 Hemi 4x4
2016 Dodge Challenger Scat Pack
Re: 1974 Yamaha dt250 Enduro [Re: Richwood] #4745596
05/02/18 01:24 PM
05/02/18 01:24 PM
Joined: Dec 2006
Posts: 4,224
Port Orange, Florida
Panzerman Offline
Panzerman  Offline
Joined: Dec 2006
Posts: 4,224
Port Orange, Florida
Another thing I can let mine sit for 6 moths to a year and it usually starts by second kick.
Super simple, reliable design. You can take the battery out and still runs. I leave my battery in so the power has a place to go but truly a apocalyptic motorcycle that will run on anything.



2006 Dodge Ram 2500 Hemi 4x4
2016 Dodge Challenger Scat Pack
Re: 1974 Yamaha dt250 Enduro [Re: Richwood] #4745602
05/02/18 01:28 PM
05/02/18 01:28 PM
Joined: Oct 2014
Posts: 12,733
Canyon County Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 12,733
Canyon County Idaho
2 stroke injector oil in that tank on the side below the seat, ATF or a 30 wt HDEO or a MC 4 stroke oil oil in the transmission. The DTs are beautiful.


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: 1974 Yamaha dt250 Enduro [Re: Richwood] #4745722
05/02/18 03:33 PM
05/02/18 03:33 PM
Joined: Aug 2011
Posts: 3,325
n.c.
gman2304 Online content
gman2304  Online Content
Joined: Aug 2011
Posts: 3,325
n.c.
I had a DT250 back in the day. Even the same color! I would take the oil tank off and clean it, and possibly the gas tank and carb as well.

Re: 1974 Yamaha dt250 Enduro [Re: Richwood] #4745727
05/02/18 03:40 PM
05/02/18 03:40 PM
Joined: Aug 2011
Posts: 2,128
Lakeside, CA
Blkstanger Offline
Blkstanger  Offline
Joined: Aug 2011
Posts: 2,128
Lakeside, CA
Love the old DTs. I had a 74 DT 360 in High School. At the time the local PD had officers riding the same bike. It was strange seeing them around town on bikes just like mine.

Last edited by Blkstanger; 05/02/18 03:40 PM.

99 Jeep WJ 4.7 195,000 Maxlife 10w30, Fram Ultra.
Re: 1974 Yamaha dt250 Enduro [Re: Richwood] #4745788
05/02/18 04:50 PM
05/02/18 04:50 PM
Joined: Aug 2009
Posts: 3,922
Pittsburgh,PA U.S.A.
JimPghPA Online content
JimPghPA  Online Content
Joined: Aug 2009
Posts: 3,922
Pittsburgh,PA U.S.A.
Put new tires on it. Tires that old are blowouts waiting to happen and a blowout at speed is something you do not want to experience on a motorcycle.

Back in 1973 I bought a 1964 Yamaha 175 2 stroke. I did not trust the 2 cycle oil injector so I pulled it off and ran pre-mixed gas.


Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa

Re: 1974 Yamaha dt250 Enduro [Re: Richwood] #4745819
05/02/18 05:12 PM
05/02/18 05:12 PM
Joined: Dec 2016
Posts: 7,480
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,480
Waco, TX
Clean the mice out of the airbox.

I always left the oil injection pump in place and the oil tank filled, mine never quit - but I always added a tablespoon of STP to the gas, just in case!


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: 1974 Yamaha dt250 Enduro [Re: Richwood] #4745826
05/02/18 05:15 PM
05/02/18 05:15 PM
Joined: Jan 2011
Posts: 3,330
PV Az
AZjeff Offline
AZjeff  Offline
Joined: Jan 2011
Posts: 3,330
PV Az
Blast from the past. I didn't have one but riding buddies had them from 125 to 360 and beat them mercilessly. True jack of all trades ride. The only thing that seemed to kill them was letting the 2 stroke oil tank run dry. Looks real stock except for the rear shock upgrade.


86 Samurai 1.3 leftovers
14 RAV4 2.5 5W-20 PP
16 Silverado 1500 4.3, DI, AFM 5W-30 PP

The most important thing to do in your life is to not interfere with someone else's life. - Frank Zappa

Re: 1974 Yamaha dt250 Enduro [Re: Richwood] #4745904
05/02/18 06:19 PM
05/02/18 06:19 PM
Joined: Feb 2003
Posts: 7,854
Jupiter, Florida
Cujet Offline
Cujet  Offline
Joined: Feb 2003
Posts: 7,854
Jupiter, Florida
Those bikes had oil injection. Due to it's age, and unknown condition, I suggest pre-mixing the gas and oil at 40 to 1. The oil injection pump is very likely to NOT function (at least initially) due to congealed oil, air or a clog.

Use any quality two stroke oil designed for air cooled engines.

Also, many of those bikes had a unique electric start feature. They energized the engine's generator with battery power to directly turn the crankshaft over. There was no starter motor.

I can't recall if that particular year had that feature, but I think so.


People who count on their fingers should maintain a discreet silence.
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