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'81 SRX reverse cam secondary
Posted: Wed Feb 18, 2015 12:50 pm
by Yam429
I have an '81 SRX 440 with a comet 108 primary. I have heard that I will need a reverse cam secondary off of a '95 or '96 vmax in order for it to run right. Is this true & will this secondary slide right on or will I need the '95 vmax jackshaft as well? Does anybody know what spring & weights I should be running with this setup? With my current setup (108 & stock secondary) I can only get 42 mph out of this sled at 5500 rpm. Thanks, Reed
Re: '81 SRX reverse cam secondary
Posted: Wed Feb 18, 2015 8:49 pm
by vmax-540
Yes the reverse cam off of the newer Yamaha's will fit your secondary shaft. Start with N1 weights and the purple spring in the comet, you will need to clutch it to run at 9000-9250 rpm's. This should get you started..
Re: '81 SRX reverse cam secondary
Posted: Thu Feb 19, 2015 9:03 am
by Yam429
Perfect, I'll try that. Thanks Jeff
Re: '81 SRX reverse cam secondary
Posted: Thu Feb 19, 2015 9:26 am
by Vmax540
x2 on Jeff's reply. Loads of good reading here
viewtopic.php?f=2&t=1506
Re: '81 SRX reverse cam secondary
Posted: Thu Feb 19, 2015 10:25 am
by Yam429
Which purple spring in the 108? There are two a 207758 or 207888.
Re: '81 SRX reverse cam secondary
Posted: Thu Feb 19, 2015 11:06 am
by Vmax540
Re: '81 SRX reverse cam secondary
Posted: Fri Feb 20, 2015 11:39 am
by chrisrider63
so I could use a polaris primary and vmax 500 new style secondary for the 81 srx? And/or yamaha clutch awesome!!! Never thought of this. Doesnt it need to be cut or something?
Re: '81 SRX reverse cam secondary
Posted: Fri Feb 20, 2015 7:46 pm
by vmax-540
Use the 207888, it should get you in the ball park..
Re: '81 SRX reverse cam secondary
Posted: Fri Feb 20, 2015 8:40 pm
by Bob Vehring
I used a new Polaris on mine and cut the 83 sec to open more. Phil had a post on here somewhere which turned me on to the trick.
Re: '81 SRX reverse cam secondary
Posted: Fri Feb 20, 2015 9:34 pm
by Yam429
Shoot I just got the purple 207758A spring delivered to my door today. Am I going to want the purple 207888A instead? How much of a difference is there?
Re: '81 SRX reverse cam secondary
Posted: Fri Feb 20, 2015 11:20 pm
by Vmax540
Yam429 wrote:Shoot I just got the purple 207758A spring delivered to my door today. Am I going to want the purple 207888A instead? How much of a difference is there?
viewtopic.php?f=2&t=1506&p=9822&hilit=purple#p9822