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When refreshing your carb don't forget to replace the floating valve seal. Carb cleaners and time will degrade this seal and negatively affect idle stability and throttle response.

Here's a How-To that will show you how to replace this seal:

http://crfsonly.com/howto/keihin-fcr-ca ... rf450r.php

Please post comments or questions about this How-To or seal in this thread.

Ken

Ken,
Excellent write up & super pictures that put the whole thing together ! Nice.

Only thing I'll add is - I thought I was the only one with big fat thumbs.

Neil

thanks Neil! the camera adds ten pounds!