1st timer - Yamaha Radian Cafe/Dual Sport Build

jrod0283

New Member
I had been toying around with the idea of building a cafe racer type bike but with dual sport tires for a while. I am from the rock crawling/Jeep scene, had a sports bike in college, am handy with mechanical things and am comfortable fabricating complex things from scratch.

I ran across a great deal on a 1989 Yamaha Radian yx600. Runs fairly well. 13k miles. Clean title. A little road rash on the right side, but nothing serious. Paid $500.

I wanted something fun to scoot around town on. Nothing serious. I wanted to keep it somewhat budget friendly. I have a clear idea of what I want to build.

Bike was delivered this Friday. I tore into it this weekend and am feeling good about its direction so far. I'm no motorcycle expert so some things I've had to Google, but mostly I just decide on a plan and start unbolting stuff until I figure it out on my own.

This weekend I:
Swapped in a new battery
Changed out rectangular light for a round Kc
Cut of most of the rear frame and tabs
Uninstalled unnecessary plastic crap
Started building a small flat seat
Built a new fuse box under seat
Moved ignition boxes around
Painted fuel tank
Removed mufflers
Removed ghetto turn signals
Removed rear passenger pegs
And generally cleaned it up.

I'm going to add foam to the seat base then wrap it in an old brown Carhart canvas jacket. Will sew baffles (or whatever they're called) into it.

I still need to swap out the handlebar for something flatter.

Going to throw some ww2 style white star decals on the sides of the tank.

Will either wrap or paint the remaining exhaust.

The bigger projects that are currently out of my knowledge depth are rejetting the carbs after I add pods and lowering the front end a bit.

I also want to put on some aggressive dual sport tires but having 16" wheels is limiting my options. Wondering how much of a pita is would be to swap to a bigger wheel so I can pick the tires I want instead of settling on what's available.

I would love any input or ideas.

I'll try to post the photos in order of the build, starting with before I got it.


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More photos of this weekend's progess...

Momentarily contemplated using the factory seat after I Refinished it to tan but quickly changed my mind. Definitely want a flat small seat...

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More photos of this weekend's progess...

Cutting more off the rear frame and started building the seat base...

Also ditched rectangular headlight for a kc light off an old jeep project.

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Additional frame cutting. Trying to flatten as much as possible without having to completely rebuild the back half. I'm digging it. Will still need to build a small "skirting" on each side of the seat base.

Also realized shifter and rear brake are in awkward spots for me. Being a big guy I'm not that limber (6'2" 315lbs). I'll need to figure out how to relocate them so that I'm more comfortable.

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The quickest and easiest way to get an inch is to undo the triple tree clamps and let the tubes slide up until they are just clear of the handle bars.
To actually shorten the forks it is much more work and you need to completely disassemble the forks and add spacers. I have a detailed procedure some where. If you are interested I could find it.
Cheers
Tim
 
XS750AU said:
The quickest and easiest way to get an inch is to undo the triple tree clamps and let the tubes slide up until they are just clear of the handle bars.
To actually shorten the forks it is much more work and you need to completely disassemble the forks and add spacers. I have a detailed procedure some where. If you are interested I could find it.
Cheers
Tim
Thanks, I'll give it a shot!


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J-Rod10 said:
Any idea the effects lowering the front will have on handling?
My understanding is that it might decrease the turning radius a little. Only one way to find out! The nice thing is it's easily reversed (if I just loosen the triple forks and slide them down an inch or so.

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I started building the upper portion of the seat. Cut and glued foam from a camping bedroll onto the base. Layered and made contours. I like the result a lot. Photos to follow soon.

The place is to use the material from an old brown carhart work jacket to upholster the seat.

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And yes I realize that Yamaha Radian YX 600's aren't near as popular as others brands and models and that it's not technically a typical cafe racer build. Its original shape is more of a tracker, but the seat is more of a brat style and the tires/suspension are more of a scrambler style. The handlebars will be clip ons mounted low. I don't want to really focus on what box it fits into. My goal is rather to build it to suit my personal tastes regardless of the perception of the "mixing of styles". I threw it into this cafe category the forum bc I assumed it was the busiest and therefore more likely to get views/responses to questions.

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jrod0283 said:
And yes I realize that Yamaha Radian YX 600's aren't near as popular as others brands and models and that it's not technically a typical cafe racer build. Its original shape is more of a tracker, but the seat is more of a brat style and the tires/suspension are more of a scrambler style. The handlebars will be clip ons mounted low. I don't want to really focus on what box it fits into. My goal is rather to build it to suit my personal tastes regardless of the perception of the "mixing of styles". I threw it into this cafe category the forum bc I assumed it was the busiest and therefore more likely to get views/responses to questions.

Good perspective.

Lowering your front end by sliding the fork tubes through the triple trees will decrease the rake and trail. In general, that will have the effect of making the bike "turn in" to corners more quickly and easily, and decrease high speed stability. On most bikes it does not take much to make a very noticeable effect. You may consider the increase in perceived nimbleness a plus, but if you like to go fast, the earlier onset (often accompanied with an increase in severity) of speed wobble may not be worth the trade off. A steering damper is the usual solution. Wheel diameters, weight distribution, and tire brands and sizes have a major effect as well, as does of course what you do to the rear end. If you are critical with regards to the handling behavior of your bike, you will be well served to keep it very close to how the manufacturer built it and make intentional changes to "fix" behavior you don't like. If you build to an aesthetic, your job of then "fixing" your bike to drive nicely likely will be very much more difficult.
 
jpmobius said:
Good perspective.

Lowering your front end by sliding the fork tubes through the triple trees will decrease the rake and trail. In general, that will have the effect of making the bike "turn in" to corners more quickly and easily, and decrease high speed stability. On most bikes it does not take much to make a very noticeable effect. You may consider the increase in perceived nimbleness a plus, but if you like to go fast, the earlier onset (often accompanied with an increase in severity) of speed wobble may not be worth the trade off. A steering damper is the usual solution. Wheel diameters, weight distribution, and tire brands and sizes have a major effect as well, as does of course what you do to the rear end. If you are critical with regards to the handling behavior of your bike, you will be well served to keep it very close to how the manufacturer built it and make intentional changes to "fix" behavior you don't like. If you build to an aesthetic, your job of then "fixing" your bike to drive nicely likely will be very much more difficult.
Thanks for the heads-up! Definitely some other consider.

When I finish the new seat I'm going to drop the front an inch or so and take it for a spin and see how it handles. The nice thing is that lowering this way is easily reversed. Since it not a daily driver and I'm not a speed demon at all I think for low speed casual trips around town on occasion that it will be fine.

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Dropping the forks an inch in the triple clamps will not affect the handling. Plus youcan just move it back to original anytime. If you are going to then drop some more internally you have to be more carefull with ground and tire clearance. Plus if you only drop the front you make the steering angle steeper which if you go too far it will get twitchy. Don't like tank slappers?
Just drop an inch in the triples and see how you go.
Cheers
Tim

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XS750AU said:
Dropping the forks an inch in the triple clamps will not affect the handling. Plus youcan just move it back to original anytime. If you are going to then drop some more internally you have to be more carefull with ground and tire clearance. Plus if you only drop the front you make the steering angle steeper which if you go too far it will get twitchy. Don't like tank slappers?
Just drop an inch in the triples and see how you go.
Cheers
Tim

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Yes, yes it will. Changing the rake and trail is always going to have an effect on handling.
 
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