Bike: 1980 TT500G
Motor: bone stock
Exhaust: Super trap with header
Intake: aftermarket high velocity
Carburetor: Mikuni Sudco 36mm
Air Filter: K&N (air box is gone)
This is my own Yamaha TT500. It is one of my favorite endure bikes ever. I managed to tag this TT500 so I use it on the street 95% of the time.
The bike is all stock except for the pipe, the intake manifold and the carburetor.
I purchased a Sudco Mikuni set up for the TT500 but I have a hard time starting the bike when it is cold.
Once it is warm, it runs like a champ.
I’ve tried every possible trick for cold starting and I finally decided to start playing with the pilot jet.
After a few changes, this is the best combo that I found:
The cold start routine is the following:
I open the petcock valve, I wait a few seconds to make sure the carburetor is topped with gas.
I open the choke, and I rotate the engine a few times pulling the decompressor. I do this to push gas into the cylinder.
Next, I close the choke and I turn the engine until I feel compression, then I bring it back up, then I pull the decompressor again to move the piston until the indicator is white (not at the beginning of the white strip, just in the middle), then I go back up one more time, and I kick hard all the way. That’s how I get it fired up.
With the 30 pilot, runs idles clean and take 1 1/2 turn approx on the air mix screw. I live in Florida, so humidity and hot weather is a factor to consider. 🙂