Video of my 1977 Yamaha IT 400D fully rebuilt!

[ggundamblue]

http://www.youtube.com/watch?v=LF7zKZJ1E28
Tell me what u think!!

 

[thejake456]

cool! u would think for a 400 2 stroke it would wanna pick up more! my friend has a yamaha 462 or something like that and that thing is CRAZZY!!! them older bike were awesome!

 

[ggundamblue]

it does pick up a lot my bro who was riding it popped a wheely in second haha...scared the crap out of him..im running it alittle rich on oil right now for break in. 16:1

 

[BigRedAF]

Nice helmet...

 

[ggundamblue]

lovely isn't it?

 

[todd36]

That brought back some memories. I had a friend in high school that had 77' It400. It was fun to ride, but was the most ill handling beast I have ever rode :) :) your bike looks good

 

[ggundamblue]

That brought back some memories. I had a friend in high school that had 77' It400. It was fun to ride, but was the most ill handling beast I have ever rode :) :) your bike looks good

\haha thanks...i did a top end rebuild when i got it and the piston was seized and locked...bought a used gas tank tire's cleaned the carb bought a air filter cleaned it off and did a lot of other things and it started right up. i have to put gas in the spark plug hole when its cold its about 40 or so were i live...so its hard cold starting it. its still not totally done i don't think air to fuel is right.

 

[todd36]

On the cold starting, make sure the passage in the float bowl for the choke enrichment is clean. I start with a dry float bowl and gently fill the chamber up with carb cleaner then watch and see if the bottom of the float bowl is getting wet. It is a very small orifice and plugs up easily

 

[Coop]

Doesn't sound too bad. Seems a little rich.

Next time I suggest at least a helmet and gloves :).

 

[thejake456]

yup, better to be safe than sorry!

 

[ggundamblue]

ya i just got a helmet today. im running it abit rich though because of break in. the bike calls for 20:1 but for break in's it calls for 16:1 but ehh idk if i got the air to fuel right...any tips on that? thanks!

 

[N3WFI3]

back in the day oil was crap that's why they say 20:1, but now that's way to much, oil technology has advanced a lot

with big bore 2 strokes they rev slower then smaller ones
so it would be safe to run 32:1 all the time or 40:1 after break in
the most oil i would go with is 24:1 during break in

right now your mixture is running more lean because of more oil

24:1 32:1 and 40:1 are all richer because it's
more gas and a little less oil

 

[ggundamblue]

ah alright thanks! i'll try it out.