My 720 won’t go past 2k rpm

[LilDemon]

My 1980 Datsun 720 won’t go over 2k-3k rpm when driving neither will parked. 
It up shifts fine but won’t go past 2k rpm making it hit a max of 30mph.

also when idleing it idles low and eventually shuts off by itself.

[datzenmike]

Did it just start doing this or gradually got worse, or you don't know because you just bought it.

 

When warmed up is the choke fully off or open or on still and closed?

Closed

 

 

 

Open

 

 

[LilDemon]

2 minutes ago, datzenmike said:

Did it just start doing this or gradually got worse, or you don't know because you just bought it.

 

When warmed up is the choke fully off or open or on still and closed?

Closed

 

 

 

Open

 

 

I just checked it out and after opening it myself it starting going 2k rpm and running fine except the fact that some times it like loses power or something 

[datzenmike]

So... it was warmed up and you had to open it???? So then the answer was it was closed?

 

Was there any change from doing this?

 

54 minutes ago, datzenmike said:

Did it just start doing this or gradually got worse, or you don't know because you just bought it.

 

 

What about the other question?

[LilDemon]

10 minutes ago, datzenmike said:

So... it was warmed up and you had to open it???? So then the answer was it was closed?

 

Was there any change from doing this?

 

 

What about the other question?

I think that it was closed or bearly open and I had to poke it to open it 

 

[datzenmike]

 

 

 

 

1 hour ago, datzenmike said:

Did it just start doing this or gradually got worse, or you don't know because you just bought it.

 

 

 

 

This was with the engine warmed up"

 

 

Did you take for a drive and it run better? Did it idle better. Any change?

[LilDemon]

1 hour ago, datzenmike said:

 

 

 

 

 

This was with the engine warmed up"

 

 

Did you take for a drive and it run better? Did it idle better. Any change?

Oh yes it runs a lot better now thank u 

[datzenmike]

Well what I would do now is (engine off) move the choke open and closed many times while holding the throttle open about 1/3 and watch what moves. Then spray WD-40 all over the moving parts and move them all by hand to clean, lubricate and loosen them.

 

Tomorrow when the engine is cold watch the choke flap and have someone step on the throttle. What you should see is the choke flap snap closed. Start and warm up for 10 min. What you should see is the choke open fully. This is the normal operation of the choke. If it isn't, then some thing need to be checked and adjusted.

[Charlie69]

That carb needs cleaned inside and out, the lube linkage with a dry silicone spray.