I have searched and searched and have not found a def. answer to help myself out..
I just purchased a 98 GS.. Has 150 main, 40 pilots, K&N lunch box, Wileyco slip on, and that is about it engine wise.
When I bought the bike it did not have these problems, seemed to run good rode it around for awhile and it never happened. Hauled the bike 200+ miles north and it started happening..
Starting it up seems roughly normal, runs fine, warms up about right.
Now I go for a ride will sometimes hesitate down low right off the bat, (2.5k-4k) is really choppy and will buck some.. huge loss of power. After that 4k on up seems to be fine, sometimes a little flatter in the upper rpms but nothing too bad.
Here is where I have found no info on how to fix this. It seems like the longer I ride in traffic, the worse the hesitation is. So obviously when the engine temps rises it gets worse. Sometimes so bad that I have to slip the clutch more at higher rpms to actually move. But then if I get on a long straightaway out of town and let it cool off some it will run better with a nice random (but still consistent) hesistation.
Top end still seems pretty good other than the slight flat spot (really not too noticable) and idle seems fine.
I have put new plugs in it, gapped to .035. Have ran carb cleaner through 2 tank fuels...
The bike has not had a recent valve job, been about 4500 miles. No audible sounds that they are out of adjustment but could this be a factor? Plan on getting it done soon but just wanted to throw that in..
Since I have bought this bike slightly modified anything I should look at for mistakes.
I plan on tomorrow screwing the air mixture screws in all the way then back out to 3 and go from there.. if I get to 4 turns and still not better I will go back to 3.5..
Just wanted to make a new thread with the different symptoms I am having, the heat problem to me seems wierd.. is this a wierd problem tho?
Thanks for any help you can give me...
to me it sounds like you are running rich, just by the way you say it gets worse as its warmer
have a look at this page
http://www.factorypro.com/tech/carbtune,CV,high_rpm_engines.html
it might pay to wind those screws into 2 then go from there,
150 is probably a bit rich for just the lunch box filter,
what do your spark plugs look like after a ride??
well my plugs are not "wet" they are a little black all over with some white around the electrode and the ground. which tells me I am running rich.
i was wondering if 150's would be too big but I have searched alot and most people say 150/40 for lunchbox, and exhaust (even if slipon is what I read).
I woke up too late this morning to mess around with it gotta go to work. I will try the mixture screws at 2 and see where the magical mark is.
and its reassuring to read that when it gets worse than warm it is usually too rich (on that site)
thanks.