84 Venture Running Rich

[powereng1]

Hi, First post. Background. ---My 84 venture is running rich. I replaced the carb diaphragms because they were shot, ultrasonically cleaned the carbs last fall. When you twist the throttle it goes like stink. Last fall it was sluggish at cruise (2000 RPM). I ran seafoam through it and put new plugs. It ran much better but the plugs are very sooty(ALL 4 PLUGS EQUALLY SOOTY) and the sluggish tendancy returned this spring. I plan to do seafoam and plugs again.

Question- I have the idle mixture screws out 2.5 turns as per the manual. Do I screw them in or out to lean the carburation out?

PS- 1984 Venture first gen with 30,000 miles on it. I rebuilt the exhaust collector box so the exhaust is tight.

Thanks for any input. James

[skydoc_17]

Hey James,

Welcome to the site!

A few things to check would be the Air Filter, A dirty Air Filter will cause the Carbs. to run rich. You might want to pull the Carb. Diaphragm Caps and make sure the Slider Assemblies have not seperated. This is a fairly common problem with the MKI First Gens.

Here is a link to the Needle Shim Mod which will lean out the Main Jet Needles:

 

http://www.venturerider.org/classifieds/showproduct.php?product=2711&title=needle-shim-mod-nylon-spacers-21&cat=6

 

If you have questions about the Needle Shim Mod, or if you would like pics of the Idle Mixture Screws and their adjustments, feel free to PM me.

Earl

[powereng1]

Hey Earl, Thanks for the reply. The air filter looks good (see lots of light through it) but I will replace it to be sure. I did the diaphragms last year but I'll double check the sliders for seperation.

I have found the idle mixture adjustment (in 1/2 turn) to lean it out. I'll try it next week when I get back from a trip. Thanks for your help. James