Need general information on 69-73 yamaha dt175

Hey all. I just picked this beauty of a bike up today. See picture below :) I have no real information on the bike. It was 50 bucks so I figured what the hell, If I toss 50 into fixing small things up and it rides in the woods, then I am doing great. Looks to be a early dt175 The guy I bought it from said it was a dt175 but not sure on the year.

I've never owned a 2 stroke before, always ridden 4's all my life, so this is a bit new. Especially the bike having 2 spark plugs, and all the lights n what not taken off, which I dont really care for, but the headlight would be nice.

I noticed there looked to be a spot for a small battery or something under the seat.

Now I have confirmed I do have spark, and I know fuel is getting to the plugs because they were both wet and fowled, What really blew my mind was I have a ngk bpr8es plug on one side, then some ancient looking autolite that just says 64 resistor which were totally different plugs. The ngk is the same style I run in my large turbo starion engine, then the other seems to be a pretty hot plug.. The guy said his son said it was running in the summer and he just ran it out of gas. I suppose it's possible? It has compression, and kicks over good.

First I need to know what plugs this thing takes, and at what gap?

Second, I seem to be missing a second spark plug wire? Any ideas here? If I am, can I get the setup off any other old yamaha bikes? I didnt see any cut wires , but I havent pulled the tank either.

third Can I just run 2 stroke oil in the oil injection or what? I didnt even know it had injection oil and poured some mixed stuff in the tank. I'll have to dump it out tomorrow.

Anything else I should look out for?

Lastly, do I get the award for ugliest possibly near running bike? :laugh:

I'm heading to the local motorcycle salve yard tomorrow to dig up a seat and some other parts possible. Hopefully I can source a straighter tank and fenders, who knows, maybe even a set of forks. I blew one of the seals out when I strapped it down from the rust on the very top of the fork lol

I'll try and get a vin number tomorrow and some better pictures.

actually good stuff. I tore most of the bike down and removed all the electrical minus the wire for the coil the other day. Also wirewheeled the bike and patched a hole in the exhaust and did some painting. It already looks 1000 times ebtter, but unfortunately after draining the milk out of the transmission and then redraining it after putting a new quart in. The bike is passing a ton of transmission oil into the cylinder and out of the exhaust. It will fire up and run so so, but I gotta figure out where the oil is coming from.


I have no diagram of this engine so im not to familiar with what it looks like underneath. I found a thread about someone else talking aboutt his and someone had said it could be the crank seals? Which makes since to me since someone ibviously drove this thing through water or dumped it in water.

I'm hoping there is something I can do without dropping much money into the engine.

Other than that, I cleaned thet ank out, pretty nasty, wirewheeled both fenders down to metal, banged out some dents, and scuffed up the paint ont he tank, and spent a a few hours painting it. I experimented with some metalic silver and a clear yellow, but it turned out like crap, and I thought it looked so good as the metalic silver that I just stripped everything back down, and redoing it in silver with a clear.

I also need to go through the carb. It was pretty gummed nasty. I did a quicky clean just to see if it would start, which it did, but gas is just dripping out fo the overflow so I guess the float isnt working right. Gonna have to go through it a little better next time.


by the way, great information on the forks and wheel.

Any idea if a late model engine say 78 or 79 will bolt into the chassis? I'm 99% sure the engine had a ct1 on it.

Shaun

Hopefully it is the seal. Our tuesday night car meet is coming up, so I figure we have a tear down project to play with. I'll snap some more of the bikes current progress tonight if I get a chance.