Sputtering while cruising problem

In advance, I apologize for my stupid questions and lack of knowledge when it comes to this kind of stuff. I admit that I'm a rookie at best. I've read around a little bit on here and haven't been able to search up a good answer. Now that that's out of the way... 8)

I have an 82 750 maxim that I picked up about 2 months ago. I was having some problems with it sputtering a little while cruising and under part-throttling acceleration, and it taking next to forever to warm up and, due to my rookieness(see above), decided to take it in to get fixed.

Before I dropped it off, I did the following:
-new oil and oil filter
-new K&N stock airbox filter
-turndown straight through(no mufflers) exhaust

I ordered the dynojet jet kit and dropped it off to have it installed while it was gutted. The guy working on it called me and said the plugs were fowled up(I believe it because they looked mighty ancient) and those were replaced, and a solid amount of goop was removed from the carbs. The 124 jets were used per reccomendation of the dynojet kit.

I got it back and it ran beautifully, like a brand new bike. Took maybe 2 minutes to warm it up and it ran like i'd been riding it all day from the first block til the last. Now 2 days later, it's back to sputtering a little bit when I'm cruising. Under part throttle acceleration it sounds like there is a misfire every second or so. Under WOT acceleration it hauls ass and has no problems at all. Also, the oil light came on my nightrider dashboard came on for about 3 seconds while riding then kicked back off and it hasn't turned on since then, about 20 miles of riding after that.

Thanks a million in advance, any ideas or help is greatly appreciated--I'm definitely willing to learn.

 

I don't know much either bud, but the oil light could come on if it's not topped off all the way and your going up a steep hill or something.

 

Yes, the oil light can be intermittent when the oil is just barely low. Try topping it up a little.

Check your fuel supply:

1) Make sure you've got gas in the tank
2) Make sure the vacuume line to the petcock in correctly positioned (no sharp bends, etc. (That's the tube running from the #2 carb holder to the petcock or valve on your tank. I assume that you've got a vacuume valve petcock. If not, I'm sure someone with your bike will pipe up.)
3) Check yer float levels--clear tube method (do a forum search for this topic to learn how).

THese are some easy things to establish. Tell us how yer doing with these and report back. If the problems persist, I'm sure someone will help.

 

It doesn't matter which Intake Manifold the Petcock Vacuum Line is attached too. Just that it is attached to one when the bike is running.

Fill the Sump with Oil until the Air Bubble in the Sight Glass is all but gone.

Runs good Wide Open.
Sputters otherwise.

100% of the Studio Audience answered: "Clean and Tune your Carbs!"
Synchronize
Get the Idle Mixtures On-the-money

Clean the Inside, Outside and Drilled-through Metering Ports on the Emulsion Tubes.
Clean and Flush-out the Main AIR and Pilot AIR Passages.

Refinish the BORES that the Diaphragms Rise and Fall in.
Search Archives for:

"Clunk Test"

 

And since it ran good for two days after you had your carbs done look for crap in the tank and add an in-line fuel filter.

 

Therein lies the part that has me the most confused; I guess I'm more curious as to what could be the possible source of gunk that would build up in less than 40 miles of riding. It ran junky before I took it in, then everything got completed cleaned out(I'm only assuming the things you mentioned were touched on), then ran like a brand new bike for about 30-40 miles after I got it back, then started to get back to it's old self again.

I'll drain the tank and do a seafoam treatment then put on an inline filter and see if this will clear it up. If my carbs are goo'ed up after only 2 days of minimal riding then there must be some pretty vicious poop monster hiding in my fuel tank flinging carb clogging gunk.

Thanks for all the responses

 

I added "In Line" Filter to my Signature Section.

It's something we ALL should be doing in these days of "Who knows what's coming out the Nozzle" at the Gas Station ... and, 20-years of "Who know's how rusty the tank is"