1986 Suzuki DT75

[steiger23]

Need help on adjusting idle on 1986 3 carbed 75 hp Suzuki DT75. There doesn't appear to be any obvious adjustment screw on this 1986 model. Have searched n searched but found nothing. Is it done via linkage? Someone here must know how to do it. Please help.

 

[99yam40]

I am not a Suzuki guy, but you need to find a service manual for your motor.
You should have a service manual for all motors you own if you plan on working on them

 

[steiger23]

I am not a Suzuki guy, but you need to find a service manual for your motor.
You should have a service manual for all motors you own if you plan on working on them

Haven't been able to find one.

 

[steiger23]

I am not a Suzuki guy, but you need to find a service manual for your motor.
You should have a service manual for all motors you own if you plan on working on them

Actually after months of searching, just found a reasonably priced manual on Tradebits.com, which has info I need.

 

[99yam40]

good to hear.
I am sure there is a pilot mixture adjustment screw on each carb somewhere just like on my Yamaha you can fine tune the idle some.

all 3 throttle plates need to be closed completely to lock the linkage together So all are opened exactly the same amount, and then adjust them to open to idle speed

then fine tune the idle mix screws

 

[cyclops222]

Adjusting multiple IDLE speed and IDLE mixture screws on 1 engine is a great way to screw up the adjustments. Been and screwed up several good racing engine idles.
Finally the olld guys taught me several ways. AFTER the carbs had been rebuilt / regasketed correctly.
Back then we always tapped into a idle VACUUM line. My favorite way. 2, 4 , 6, and 8 idle adjustments on some engines were difficult. Add in a staggered opening of each carb butter fly and I used a piece of LOG LOG graph paper to keep track of screw turns to vacuum / to rpm changes.

 

[steiger23]

Adjusting multiple IDLE speed and IDLE mixture screws on 1 engine is a great way to screw up the adjustments. Been and screwed up several good racing engine idles.
Finally the olld guys taught me several ways. AFTER the carbs had been rebuilt / regasketed correctly.
Back then we always tapped into a idle VACUUM line. My favorite way. 2, 4 , 6, and 8 idle adjustments on some engines were difficult. Add in a staggered opening of each carb butter fly and I used a piece of LOG LOG graph paper to keep track of screw turns to vacuum / to rpm changes.

What does that have to do with a 3cyl 2 stroke 75 hp Suzuki?

 

[cyclops222]

Nothing