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Old Streetfighter Motorcycle Forum Post 05-09-2016, 09:07 PM   #11
CK 187
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Default Re: yz80 -- old ass mini moto

Haul your ass over to Edgerton and see Ryan S at The Bargain Barn for tons of parts
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Old Streetfighter Motorcycle Forum Post 05-09-2016, 10:06 PM   #12
Racing Geek
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Default Re: yz80 -- old ass mini moto

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Originally Posted by CK 187 View Post
Haul your ass over to Edgerton and see Ryan S at The Bargain Barn for tons of parts
I sold him a Buell XB front wheel and fairing at Woodstock a few weeks ago. He was interested in my other front wheel but decided against it. I wonder if he'll take it as trade towards parts I need?

This yz needs a radiator shroud too. That's a big part of the reason I've only been taking photos of the left side of the bike. Haha
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Old Streetfighter Motorcycle Forum Post 05-10-2016, 07:35 AM   #13
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Default Re: yz80 -- old ass mini moto

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Originally Posted by Racing Geek View Post
I sold him a Buell XB front wheel and fairing at Woodstock a few weeks ago. He was interested in my other front wheel but decided against it. I wonder if he'll take it as trade towards parts I need?

This yz needs a radiator shroud too. That's a big part of the reason I've only been taking photos of the left side of the bike. Haha

Hit him up
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Old Streetfighter Motorcycle Forum Post 10-06-2016, 02:36 PM   #14
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Default Re: yz80 -- old ass mini moto

It has been a while with no update so here's the latest.

I bought some 80/90/17 and 80/90/14 IRC nr77 scooter tires for it and it handles much better. The front tire is the same as stock but the rear is significantly smaller. The change in diameter kills top speed but makes wheelies even easier so fun FUN!





I also cut off 2" of fork spring and added 2" of extra preload like suggested. It was significantly better but still pretty soft. I could lean against the forks and easily compress them 3-4". Jump on them and they'd still bottom out. Stock on the right, modified on the left.




A few weeks ago I was at a swap meet and bought a handful of fork springs for $5. Supposedly they are all from early 60's Triumphs. Didn't really care because they were the right diameter and appeared to be significantly stiffer. I rebuilt the forks and put the new springs in with 3/16" preload and 5wt oil and it turns out they are quite a bit stiffer. When I hold the brake and jump down on the forks I can only move them about 4-5". Much better!


Next on the list is a bigger front brake. Plan is to redrill a rotor from one of the bikes under the 21.051 to go from the stock 190mm rotor to a floating 290mm rotor. Not sure if I'll switch to a bigger caliper or leave the stock one alone. I've got a 14mm master in a box somewhere too.



Last edited by Racing Geek; 08-03-2017 at 01:23 AM.
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Old Streetfighter Motorcycle Forum Post 10-06-2016, 07:54 PM   #15
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Default Re: yz80 -- old ass mini moto

Should be using 10w or higher for a big boy rider bud, get way too much compression with that light oil. 10w-40 motor oil works good in mini motards with old forks because the fluid heats up as it cycles and gets thicker, so giving you more dampening when it is bumpy
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Old Streetfighter Motorcycle Forum Post 10-06-2016, 08:56 PM   #16
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Default Re: yz80 -- old ass mini moto

All I had on hand when I did the fork rebuild is 5wt and 20wt fork oil and I couldn't find any specs online for this old of a bike. Even so, compression seems fine now that I changed springs. I haven't done the math yet to see what exactly all the spring rates are that I've run so far but the new springs are probably twice as stiff as the stock ones when they were cut down.

If anything the rebound seems too fast but these are old school damper rod forks so I'm not sure I can do much about that. The thicker oil might help but it will also make compression stiffer which I don't really want. It's still way better than it was so I'll wait and see how things are when the front brake upgrade is done unless you've got other ideas. I'm not knocking your idea of 10wt fork oil, I'm just thinking out loud.
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Old Streetfighter Motorcycle Forum Post 10-06-2016, 10:09 PM   #17
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Default Re: yz80 -- old ass mini moto

Oh man you are gonna want that compression stiffer once you put bigger brakes on it. Although the if you are riding it more motard style you can get away with it but if you are going knee down. Stiffen the hell outta that front
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Old Streetfighter Motorcycle Forum Post 10-06-2016, 10:11 PM   #18
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Default Re: yz80 -- old ass mini moto



Knee down on a stiff front end!!!
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Old Streetfighter Motorcycle Forum Post 10-07-2016, 07:12 PM   #19
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Default Re: yz80 -- old ass mini moto

cool bike, makes me want a 2t!

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They can ban, outlaw, and restrict whatever they please. I'll keep doing whatever the fuck I'm doing, because I don't really give a shit. The only thing that will change is that I'll be breaking their made up bullshit rules while doing it, and I'm comfortable with that.

My Build http://www.customfighters.com/forums...d.php?t=118649
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Old Streetfighter Motorcycle Forum Post 10-08-2016, 02:02 AM   #20
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Default Re: yz80 -- old ass mini moto

get a pit bike grymm, we can race lol
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