Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums

Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums (https://www.vn750.com/forum/)
-   Carbs and Fuel System (https://www.vn750.com/forum/22-carbs-fuel-system/)
-   -   settting air/fuel mixture (https://www.vn750.com/forum/22-carbs-fuel-system/96673-settting-air-fuel-mixture.html)

boscoe 08-06-2017 07:34 PM

settting air/fuel mixture
 
Been reading on the forum that most people adjust the air/fuel screws (jets?) 2-1/2 to 3 turns out from the seat. Is there a procedure that specifies max or min vacuum to achieve the optimum setting? I can’t find anything about it in the service manual. Still trying to get my “new to me ‘04” dialed in. Bike runs fine. Trying to improve the fuel economy. But…………..I don’t want to fix it if it’s not broken.

Spockster 08-06-2017 09:54 PM

Using a vacuum gauge, you can adjust for the highest vacuum reading, just substitute rpm for vacuum below.

You can also set them for the fastest idle rpm.

Fully warmed engine, ridden to full operating temp.

Turn the screw in until it stops (don't tighten), turn it out two turns. Do both carbs.

Start engine, add 1/4 turns out (pause in between) until the rpm drops slightly, turn back in 1/4 turn (rpm should rise slightly). Do both carbs.

Readjust idle speed as needed via adjustment knob.

This used to be called 'lean roll' or 'lean best idle'.

You can recheck the adjustment by:

Turn screw in 1/4 turns until the rpm slows or stumbles, back out 1/4 turn.


All times are GMT -4. The time now is 08:11 AM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.

vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.

 
For the best viewing experience please update your browser to Google Chrome