Early and late forks

mikenfl · Posted: January 8, 2007, 12:18 am Post subject: Early and late forks

What model year did Yamaha go to the 35mm tubes? '76 model year is when they moved the caliper behind the fork leg. Is this when they made the change to bigger tubes?

5twins · Full Member Joined: Aug 05, 2006 Posts: 1616

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mikenfl · Posted: January 8, 2007, 8:48 am Post subject: Re: Early and late forks

Thanks for the info. Wink

I want to upgrade my '74 and this seems like a cheap and easy route.

royfisk · Posted: January 8, 2007, 9:02 am Post subject: Re: Early and late forks

mike; this is a good upgrade. But the tripple tree on the 35mm forks will not accept your dash and instrument mounts. you either have to change the mounts to the 35mm style or the whole package. another cool way to go and keep ypur original body work is to use a tx-750 fork . This is a 36mm tube and uses the same body work, which means your bike will appear stock. With this modification dual disc front brakes are easier to accomplish because you just reverse a caliper, add a disc, and T your brake line. Then dont stop there go to the back and switch the rear swing arm and rear wheel to the TX 750 add new bushings and shocks and wolla much improved handleing on a budget. I have seen 750 chasis go on e-bay DIRT CHEAP like $50.00. But like I said the 35mm is a good choice too.

RainLand · Posted: January 9, 2007, 9:51 am Post subject: Re: Early and late forks

What year of TX750 are you talking about?

5twins · Full Member Joined: Aug 05, 2006 Posts: 1616

RainLand · Posted: January 9, 2007, 5:47 pm Post subject: Re: Early and late forks

This sounds like an excellent thing to do. I've got a bare frame that I could do this with. ( That will make project #3 )

mikenfl · Posted: January 24, 2007, 9:06 am Post subject: Re: Early and late forks

royfisk wrote:

mike; this is a good upgrade. But the tripple tree on the 35mm forks will not accept your dash and instrument mounts. you either have to change the mounts to the 35mm style or the whole package. another cool way to go and keep ypur original body work is to use a tx-750 fork . This is a 36mm tube and uses the same body work, which means your bike will appear stock. With this modification dual disc front brakes are easier to accomplish because you just reverse a caliper, add a disc, and T your brake line. Then dont stop there go to the back and switch the rear swing arm and rear wheel to the TX 750 add new bushings and shocks and wolla much improved handleing on a budget. I have seen 750 chasis go on e-bay DIRT CHEAP like $50.00. But like I said the 35mm is a good choice too.

I'm thinking that a TX750 fork is what I'll use. I'm not concerned about the instrument mounting, as I'll be doing something different with that, but I'd really like to keep the early style fender with the stays. That would be more in line with the look I'm after. If I do this, will I be able to use the 650 front hub and axle, or will I need ones from the 750? Thanks.

5twins · Full Member Joined: Aug 05, 2006 Posts: 1616

cscarroll · Full Member Joined: Oct 08, 2006 Posts: 112

5twins, I'm looking to upgrade my '74 as well. If I use a '77 fork, can I use my original wheel and disk? Will later model 35mm forks fit as well?

5twins · Full Member Joined: Aug 05, 2006 Posts: 1616

cscarroll · Full Member Joined: Oct 08, 2006 Posts: 112

Great. Thanks for the good info. This sounds like just the ticket...

cscarroll · Full Member Joined: Oct 08, 2006 Posts: 112

Will a '78 or newer triple tree change my rake angle, or is this set by the frame?

I'm building a cafe racer, as such I want to stay with the standard rake angle.

royfisk · Posted: February 20, 2007, 8:14 am Post subject: Re: Early and late forks

No your fork geometry will remain the same

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