OzVMX Forum

Clubroom => Tech Talk => Topic started by: NRD on March 31, 2009, 12:35:06 pm

Title: CR250 '79-'80 forks.
Post by: NRD on March 31, 2009, 12:35:06 pm: Wanting to change the fork oil in what I think are a set of 1980 CR250 forks. They have the air caps and I don't think the '79 model had those. My question is, should the caps just screw straight out so as to refill the fork leg? I can unscrew the caps but they don't come off, feels like they are attached to the spring as I can lift the cap slightly. Also the cap still turns but feels like the spring is turning with it. Any help appreciated.
Cheers. ???
Title: Re: CR250 '79-'80 forks.
Post by: STW996 on March 31, 2009, 02:26:37 pm: Well if they are "stuck" to the spring the hole lot should lift out, 79 and 80 forks (I believe) are the same and when you unscrew the caps they should pop up from the sprin tension.

If you have the bike on a stand lower the stand (slowly) and the springs should then protude from the top of the forks.

There is no reason why the caps should be stuck to spring

Shane
Title: Re: CR250 '79-'80 forks.
Post by: JohnnyO on March 31, 2009, 05:07:59 pm: The caps are bolted to the cartridge rod inside the fork. Undo the caps then compress the fork a little and undo the nut beneath the fork cap.
Title: Re: CR250 '79-'80 forks.
Post by: magoo on March 31, 2009, 05:14:09 pm: What Johnny O said.
Title: Re: CR250 '79-'80 forks.
Post by: STW996 on March 31, 2009, 05:55:33 pm: Cartridge forks on a 80 model bike??
Title: Re: CR250 '79-'80 forks.
Post by: JohnnyO on March 31, 2009, 06:49:39 pm: Cartridge forks on a '78 model bike!
Title: Re: CR250 '79-'80 forks.
Post by: magoo on March 31, 2009, 07:03:12 pm: Correct. 78/79 and 80 all had cartridge forks. According to the rule book you can't run cartridge forks or later model forks. Go figure. Dumb rules were made to be ignored
Title: Re: CR250 '79-'80 forks.
Post by: NRD on April 01, 2009, 08:41:48 pm: Thanks guys. Got the forks apart ok. One thing I noticed is a 40mm spacer between the air cap and spring. Any reason for this? Thanks again.
Cheers.
Title: Re: CR250 '79-'80 forks.
Post by: JohnnyO on April 01, 2009, 08:52:34 pm: Most forks have a spacer just to get the correct amount of preload on the fork springs for that particular bike.