Author Topic: 1974 Yamaha DT250 (Read 6697 times)

rtbmrgl · « **on:** December 25, 2016, 11:33:33 AM »

Santa pre-ran the course last week and drop this off, 1974 Yamaha DT250, 4k miles. more pics to come. Needs some TLC

grcamna2 · « **Reply #1 on:** December 25, 2016, 11:46:16 AM »

I had a 78',That one is in Nice cond.

Any more pics Mark ?

MoMo · « **Reply #2 on:** December 25, 2016, 04:56:43 PM »

First dirt bike was a DT1-broke my wrist on it...Larry

rtbmrgl · « **Reply #3 on:** December 25, 2016, 09:04:47 PM »

Some pic, trying to get ready to ride with a Yamaha Enduro fourm group at Johnson Valley, California, late March

grcamna2 · « **Reply #4 on:** December 25, 2016, 09:26:51 PM »

You're jumping right in with both feet ! This bike won't need any cosmetic restoration,very original.

MoMo · « **Reply #5 on:** December 26, 2016, 08:17:33 AM »

Working on single cylinder 2-stroke dirt bikes was one of my favorite things to do. I've owned or worked on just about every brand every made...Larry

grcamna2 · « **Reply #6 on:** December 26, 2016, 08:21:52 AM »

Mark,
is that oil inside your stator case(left side of the engine)behind the flywheel ? shouldn't be

rtbmrgl · « **Reply #7 on:** December 26, 2016, 08:23:56 AM »

Yes exactly,
Im not painting the frame just maybe just touch up on areas that had rust or exposed metal, cleaning surface rust on chrome things. I didnt have the original rear turn signals (CB500 early Honda ones

) NPOS are $100 each. Piston was slightly scuffed seizure, bore is ok so I bought a new Wiseco piston std size. Relacing all motor seals and gaskets.
-fork seals, swing arm bushings, throttle cable, tires-tubes, chain sprockets, etc.

rtbmrgl · « **Reply #8 on:** December 26, 2016, 08:25:28 AM »

Quote from: grcamna2 on December 26, 2016, 08:21:52 AM

Mark,
is that oil inside your stator case(left side of the engine)behind the flywheel ? shouldn't be

Yes its not good, Im replacing both crack seals

MoMo · « **Reply #9 on:** December 26, 2016, 08:27:07 AM »

Crack seals

Lay off the stuff

I may have the tool for splitting the crankcases should you need one...Larry

rtbmrgl · « **Reply #10 on:** December 26, 2016, 08:33:57 AM »

Quote from: MoMo on December 26, 2016, 08:27:07 AM

Crack seals Lay off the stuff I may have the tool for splitting the crankcases should you need one...Larry

Thanks MoMo, I have a case splitter, dont plan on taking the cases apart. Ive had the tool since I worked for Yamaha in the early 70's,

grcamna2 · « **Reply #11 on:** December 26, 2016, 09:25:20 AM »

You still able to find NOS Yamaha parts !

rtbmrgl · « **Reply #12 on:** December 26, 2016, 10:48:10 AM »

Quote from: grcamna2 on December 26, 2016, 09:25:20 AM

You still able to find NOS Yamaha parts !

Yeah, but some things are hard to find, its nice you can get aftermarket piston. But the crank seals are becoming rare, the Yamaha groups are trying to someone to make double lip- double spring crank seals. There are single spring double lip seals, but not as good.

bill440cars · « **Reply #13 on:** December 26, 2016, 02:19:40 PM »

Pretty cool project there. When I arrived in Japan, while in the Air Force, Back in The day, I road tested a DT!, when they first came out and loved everything about it, but I just could not manage to make a deal for it and therefore could not afford afford it and ended up with a used CB72 Honda Hawk (250). In my case, it was probably good, that I ended up with the CB72 Honda. After all, it was best suited for my needs, at that time. Hoping that there will be a thread on getting this Yamaha back in action.

firebane · « **Reply #14 on:** December 27, 2016, 07:52:23 AM »

Nice bike. I recently picked up a 81 DT175 and know all about the NOS parts. I need an oil tank for my bike but good luck finding one

bill440cars · « **Reply #15 on:** December 31, 2016, 09:21:02 PM »

Quote from: rtbmrgl on December 26, 2016, 08:25:28 AM

Quote from: grcamna2 on December 26, 2016, 08:21:52 AM
Mark,
is that oil inside your stator case(left side of the engine)behind the flywheel ? shouldn't be

Yes its not good, Im replacing both crack seals

Yeah, need good crankseals, especially on a 2 stroke.

rtbmrgl · « **Reply #16 on:** December 31, 2016, 11:17:31 PM »

Terry in Australia · « **Reply #17 on:** January 01, 2017, 03:47:47 AM »

Aw man, that brought back memories mate, I had one just like yours (same colour too) back in the 1970's, was probably my favourite dirt bike until I bought a minty XT500 a few years later, good pick up! Cheers, Terry.

rtbmrgl · « **Reply #18 on:** January 01, 2017, 09:50:33 AM »

Quote from: Terry in Australia on January 01, 2017, 03:47:47 AM

Aw man, that brought back memories mate, I had one just like yours (same colour too) back in the 1970's, was probably my favourite dirt bike until I bought a minty XT500 a few years later, good pick up! Cheers, Terry.

Thanks Terry, hows the summer coming along.

,

Terry in Australia · « **Reply #19 on:** January 01, 2017, 01:23:42 PM »

It's great mate, was stinking hot last week but cooled down on Saturday and will be nice today and tomorrow, but then it's heading over 90 again, so not as much fun, but we'll have good riding weather down here for another 5 months or so. I forgot to mention that I had a later DT250 with cantilever rear suspension in 1980, that was a great bike too! Cheers, Terry.

rtbmrgl · « **Reply #20 on:** January 01, 2017, 05:22:11 PM »

I didnt pay attention when I bought my tires(online) I got Dunlop 803fgp trials tire, there not D.O.T. I heard they were good tires for dirt but not sure how they will hold up on street.