Choke issues? 93 vfr 750

So I posted before on the issue of my bike having bad fuel and fouling the plugs. Replaced the plugs, checked compression new gas etc fixed it. Then I lost my key, Found the key code etc. Problem solved. Now it seams I have a new problem. The bike ran great with new plugs in it ( better than it ever did before). However, I am now having an intermitent problem with the bike running smoothly. Sometime the bike runs great, other times as it warms up and I take it off choke I will go out for a ride and the bike will idle slightly fast and then studder in the mid to higher rpms (4-8K) then return to a rough almost loping idle as some cammed up motors run. Does this sound like a sticking choke issue. The reason I think sticking choke is that it isnt consistent.

 

How does the choke lever feel when you turn it on? Sticky or smooth?

If sticky, I'd suggest pulling the carbs and cleaning the choke valves.

 

You need only remove the airbox to gain access to choke valves, and a quick squirt of WD-40 is easy.
Your description suggests that one or more mixture screws may be opened up too far, resulting in an overly-rich condition; also a proper carb synchronization might help.

 

Yeah the more I tinker the more I think that I may have carb cleaning and adjusting issues to take care of. Before any of that bad gas issues and staying out over a cold night w/ low fuel, the bike ran solid even with old plugs and a dirty airfilter. Now that I cleaned out the air filter and put new plugs in it maybe there is some residue left over in the carbs and this beast just wants to be picky. If there is one thing I have learned when wrenching on things is that if it runs LEAVE IT ALONE. One thing leads to another. While I am in those carbs does anyone have a suggestions for adjustment settings, jet kits and any other tips? I live in WA state so my elevation isnt too rough. Thanks

 

Have you run some Sea Foam through the system??
If not, try it........

 

How does that work on a bike system?

 

Sea Foam is a fuel system cleaner that has performed more miracle cures than Mother Theresa; if you have clogged jets or passages in carbs, it may relieve you of the aggravation of manual cleaning. Available at most auto parts places, always worth trying. Read and follow directions.

 

squirrelman -

Just as info - (and for anyone else who uses WD-40) - it is not a long term lubricant. If you went through all of the hassle of removing the airbox to get at the carbs, you might as well remove the choke valves and clean them. A squirt of WD-40 might fix the problem for one or two rides, but will evaporate by the third ride.

In addition, the valves are not designed to be "lubricated" in the first place. So why lubricate them?

My suggestion would be to pull the carbs and clean them. It's relatively easy (provided you are taking your time and are methodical...)

A Sea Foam treatment first might be a good idea to see if it happens to de-gunk the choke slides first, but be ready to pull those carbs if the Sea Foam doesn't pass muster.

 

which method should I use with the sea foam? Through carbs or through tank. If through carbs pour it right down the bores like carb cleaner? If I do yank those carbs out then does anyone have any tips and trick with cleaning, settings, removal etc. I know those boots can be a bitch with the clamps etc. Thanks

 

i think your best results would be to add concentrated Sea Foam to carb float bowls through fuel line and tank (with low gasoline level to concentrate Foam). Pouring down carb throats is not useful for clearing jets.

Check for sticky choke cable (as VTViffer says) or missing return spring (which won't fully return to OFF) and the 4 brass choke valves. Not likely the valves because they are closed mechanically by linkage if the cable and linkage are free to move.

Personally, I'll try ANYTHING to avoid removing carbs from engine!!!!!