Question about 1982 Yamaha Xj750 Xj 750 Y140 Maxim Air Box
Yamaha xj750 1981
Check to make sure that you have no intake or exhaust leaks anywhere in your system. Once you have made sure the system is sealed you need to perform a plug chop and read your spark plugs to find out if you are running rich or lean in that particular throttle position and adjust the carburetor accordingly. Judging from the ramp range you stated, it sounds like your jet needle may be running rich. If the needle has different clip positions you may want to move the clip up (so the the needle sinks lower into the carb) to lean it out a bit on that circuit. You may also have to adjust the pilot screw as depending on the throttle position it may also be affecting this rev range. Another possibility is that you may have gone with a main jet that is too large. You stated that the new main jet is a 122 to compensate for an aftermarket exhaust. What was the original main jet size? Usually exhaust changes do not need much if any jetting changes. One to two sizes up is all you would need at the most.
Posted on Jan 26, 2013
A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Jan 22, 2014 | 2012 Yamaha Zuma 50F
Dec 30, 2010 | 2002 Yamaha TT-R 250
May 20, 2010 | 2004 Yamaha YZ 450 F
Dec 07, 2009 | 1985 Yamaha FJ 1100
Jul 08, 2009 | Yamaha G5 Motorcycles
Jul 05, 2009 | 1981 Yamaha XJ 650
Jun 26, 2009 | 1980 Yamaha XS 650 G
Apr 16, 2009 | 2003 Yamaha YZ 250
216 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: