Pilot screw MM700

[ErikBerg]

Pilot screw MM700: does 1-1/2 turns mean 1.5?

Think I have to lean low speed mixture, machine bogs at 4500-5500 rpm.

 

[taylzee]

4500 to 5000rpm would almost be into the pilot circuit. On these carbs the screw I believe you are refering to is a fuel screw and turning it out will richen the circuit. bog is usually a lean condition. I ran mine at 1.75 or 1-3/4 turns out from the seated position.

 

[ErikBerg]

Sorry my bad translation, what I mean is it seems to go rich.

 

[taylzee]

So are you 1.5 turns out from seated? Also, what size pilot jets? Are the carbs clean?

 

[ErikBerg]

Carbs areclean. Pilot jets 45,standard size. Reedspacers.

 

[taylzee]

Try giving it a shot of choke when it bogs. If it cleans it up, it's a lean spot. With a carbed motor, most likely be fuel screw or pilot. If nothing has changed since it ran good, I would think a dirty fuel circuit.

What is the compression like?
Any other symptoms?