My engine is running to rich and was wondering how to adjust it. I know that there is a screw in which you use but I don't know how far to turn it. Please help with any info on the carb you have. Thanks

 

MikeyM, in my previous post to you on this subject, I mentioned the pilot screw adjustment; 2-1/8 turns out to start.

You can adjust it without removing the carb; loosen the hose clamps, pull the carb slightly out from the engine side (clearing the tab at "three o'clock" when looking into the engine), and rotate the carb as far as you can clockwise (again, looking into the engine).

Take a small flat-bladed screwdriver and insert it into the pilot screw, through its access hole in the middle onn the engine-side of the carb.

CAREFULLY close the screw down all the way (if you torque this sucker too hard, you'll bugger it and its seat).

Then, back the screw out 2-1/8 turns to start; backing it out futher enriches the mixture, and the reverse.

When you finish adjusting the mixture screw, right the carb, shove it home, with the 3:00 tab in it its notch, and TIGHTEN the hose clamps. Still too rich? Tighten the screw slightly and try again, and vice versa, 'till she starts easy and idles steady.

www.buykawasaki.com has exploded parts diagrams of the carburetor on the Web; you might want to obtain a service manual also.

Also, come to think of it, an exploded parts diagram appears in the carburetor maintenance article I referred you to, accessible from the ATV Connection home page in the "Tech Tips" section, pilot screw adjustment is discussed there also. Didn't read it, huh?

Your problems wasn't with the choke, or "starting plunger?" The pilot screw adjustment, even if it's too rich, isn't likely to foul plugs as you described. The choke plunger; however, if it's messed up (I told you how to check and service it before), will foul plugs 'till the cows come home.

Let us know how you make out.

Tree Farmer

 

Many of the 300's where very lean at idle or off idle,putting at 3-4 mph so a few people raised the slide needle with nylon washers or shims,if some one has done this you have to remove the black CV cap on top of the carb remove the spring then the diaphram then the brass neddle is there any xtra washers? If so take one out see what happens also adj the mixture screw again to fine tune. Still not happy ? make shure your air filter is clean and lightly oiled.2nd the voltage regulator could be over charging or under charging causing the CDI (brain box) to give weird timing. or making a rod knock noise. use a multi meter and check the voltage at the battery 12.0-13.5 give or take depending on your battery & multimeter condition. start it up and rev to 4000 rpms if it goes above 15 volts volt reg could be going bad if it drops below 11 volts same thing,this is from the hip as i am not at my shop spouting tech figuers Not trying to get you side tracked but good info for the memory bank. mike