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Friction changes with temperature, so it could be something as simple as that. It is probably slipping more (and chattering less) during engagement when it's cold. If it's engaging properly and doesn't have any performance issues, I'd forget about it. It is odd that it's not chattering when cold also, because usually it happens all the time like most of the people have said so far. Sounds like it works fine though.
I just changed the clutch and flywheel in my DC Integra. Its a Clutchmasters stage 2 and i have an oem flywheel. When i've been driving around town for awhile, the clutch/engine starts to shake when im engaging in first gear. It doesnt do it when its cold. I'm not quite sure what the problem could be. Any help is appreciated.
As has been stated, a bit of chatter is common with aftermarket clutches. My car does the exact same thing. No chatter on startup but will start once warmed up ect. I'm sure cars vary depending on the clutch/flywheel setup, type of car, miles on clutch and so on but what your describing sounds normal.
If it were a real problem you would know (i.e. obviously violent chatter, slipping clutch, ect)