Yamaha – AT – CT – DT – RT
In the really early 70’s… Yamaha had these as their dirt bikes:
– AT1 – 125cc
– CT1 – 175cc
– DT1 – 250cc
– RT1 – 360cc
All were 69-71 era, piston port motors, before Yamaha really knew what dirt bikes would become. And all were relatively about the same dimensions, just different weight.
Lately I’ve been regretting buying my 71 CT1 since it’s lacking the newer technology compared to the late 70’s. I really wish I had bought a 78-82 dt175 instead; way better suspension and faster.
Regardless… I’ve been looking at ways to make mine better from a performance and suspension standpoint and after finding all these cool images, it gives me some solid inspiration. Some of these bikes below are badass! This is what I’m thinking:
– already have pod filter and jetted carb
– GYT expansion chamber exhaust
– aluminum rims. small front hub. no front brake
– plastic front and rear fender
– smaller front gear. bigger rear gear
– front end from a YZ or MX
– maybe take all my lights off and put a number plate on it
Yamaha had a power kit from the factory called “GYT”. (Genuine Yamaha Tuning)
You could walk into a Yamaha dealer in 1970 and get a new piston kit / carb / gear / exhaust (all yamaha parts) to make it go faster. I’m trying to find some of this stuff on eBay but its super rare.
FYI – the hot exhausts were:
– DG performance
– torque engineering
– moto tech
11 responses to “Yamaha – AT – CT – DT – RT”
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Published - Mar 25, 2019
Throw back pics – again
You’re welcome. I have an insane amount of pics that no one has seen. All pics are from 2011. I remember we used to do a ton of fun shit at night. I miss that.
You might check the AHRMA website classifieds. From time to time they have parts listed you might be needing.
I’ll definitely take a look at the AHRMA web classifieds.
Did you ever have any old 70’s Yamahas?
Hi Ed. I also have a 1970 Yamaha RT1. Thanks for the good info on the aftermarket parts for these bikes. If you don’t mind, shoot me an email at email@example.com.
Yamaha dealers used to retorfit the new MX with ODO/TACH & lights for customers who wanted them. I had one, off the Showroom floor, licensed for street and a screamer on the sandhills on weekends. I kept it for years & sold it when I got married (right after restoration). Wish I had held on to it. It was a heavy beast but she was my Mistress.
Where i can find for my yamaha 360 the “DT-1 GYT Kit” …
somebodycan help me to find the parts needed to convert my 360 ?
Thanks for your help
hi guys,i am going to buy a 1970 yamaha ct1 175 for 1 grand. the bike is pretty good condition considering it was born in the 70S, it run and stars almost at frist kick. it has two pipes on its heads but one wasn’t plugged, he said it was normal,was it? can you guys please make this clear for me? thank you.
Marco – 1 hole should have the spark plug and 1 hole should have a plug
it was so,hopefully it will a good one.
What’s up,I check your new stuff named “Yamaha – AT – CT – DT – RT – Chin on the Tank – Motorcycle stuff in Philadelphia. Brappp” like every week.Your story-telling style is awesome, keep doing what you’re doing! And you can look our website about cast love spells.
I have been tryu G to find a carb for my dt 250 1973 and it’s pretty hard to find I was wondering if a ct would work with it as well
What does ‘CT’ meaN at the end of my bin?