82 maxim 650 runs great when engine is cold, horrible when it warms up

ok, here is what I am dealing with......pictures! Woo Hoo!

 

New jets that were installed.....float needles and seats..old left new right.........

 

old jets, needle, emulsion tube...i believe the old needle says Y-130

 

new needle.....and air jets. Air jets were just cleaned, not replaced.

 

Had I known, I would have ordered from him too! Lol! I just bought the only kits I could find locally.

 

Hope that they work out for you.

 

drop the needle into the seat and see if the tip of the needle is the same height as the originals when the bottom of the flanges on the seat line up
so if you put the seat in the carb, drop the needle in and look at the height of the plunger tip of the needle, old ones and new ones, same?

 

You end up adjusting the float tang anyway, if needed.....

 

if the new needle/seat is taller and you adjust the tang down the tang is pushing the needle sideways
if all it took was bending the tang, any needle would work

 

Depends how you bend the tang and/or the floats themselves.....

 

The difference in needle/seat height is the difference that makes a difference (!) as Polock points out. The sets that we offer are a correct match to the originals, which is why they don't leak....we used to (way back when) carry the "supposed to fit" needle/seat units, and all we ever got was complaints, until we figured it out. Unfortunately, since the mfg. of those "incorrect" parts (they're probably correct for some other model carbs, just not for the Hitachi HSC series) has never corrected their applications list, the problem continues. AND, to make matters worse, sometimes those incorrect units would seal up, for a little while anyway, or sometimes they would leak and then not, and otherwise behave in a somewhat random manner....i.e. carbs #1 and 3 would leak, but #2 and 4 wouldn't, and then #2 would start leaking, but #4 would leak all the time..........my conclusion was that the incorrect length (and/or other factors) would cause the needle to get slightly cocked in the seat as the float "tang" moves in an arc as the bowl fills-and-empties of fuel, and this arcing path is what would cause problems with the incorrect-length needles. It was an especially common problem to have people report that the units would NOT leak "on the bench" (and they would successfully set their fuel levels, etc.) but once on the bike, would leak randomnly (or continuously) on-and-off........and my suspicion is that the vibrations in the assembly when the engine was running was exaggerating the underlying length issue / problem (which is why the problem wasn't always seen "on the bench").