Flattrack xr/crf 100s in SEMDTRA

Anyone in here racing their 100 in the SEMDTRA mad dog series this? I plan on doing as many events as i can this year in the stock class, and will head up to Coleridge Speedway in Asheboro, NC on the other weekends as time permits.

Anyone got tips on set up? The bikes pretty much have to be stock to run at the Coleridge events. I've got the spec tires, forks turned around, more oil in the forks to keep them from bottoming out, will order some gearing, but that's it. Any other tricks?

Oh, and what pressure do you guys run the tires? i'm sure that depends on track conditions, but what's a good baseline?

-Tim

A works rear shock will make a huge difference. The stock shock just does not have enough rebound control. A worn stock shock with a heavy spring is even worse.

I know suspension would make a huge difference, but rules do not allow an aftermarket shock (at least where i'll be racing most of the time). Its really a Bone Stock class. The mad dog stock class does allow for some mods, but that's not in the budget right now anyway. I just want to do what i can on the cheap and focus on riding the pants of the thing and get fast i can.

I've got the spec tires, forks turned around, more oil in the forks to keep them from bottoming out, will order some gearing, but that's it. Any other tricks?

What's that all about??? I don't flat track so I'm not familiar with it.

You basically swap the left and right forks and them the axle runs behind the forks instead of in front of them. It decreases trail and shortens the wheel base so the bike turns in faster. Someone correct me if i'm wrong here.

If it's like any of the races down here, I would cheat as much as you can and start with a Wiseco 58mm piston and a mild cam, cut the crap out of your air box or run a pod, even make a new pipe, but remount the stock guard, muffler, and paint it black. As long as you're not winning every race, no one will seriously care.

If it's like any of the races down here, I would cheat as much as you can and start with a Wiseco 58mm piston and a mild cam, cut the crap out of your air box or run a pod, even make a new pipe, but remount the stock guard, muffler, and paint it black. As long as you're not winning every race, no one will seriously care.

It is a matter of ethics. I would be honest, but that's just me.

It is a matter of ethics. I would be honest, but that's just me.

You dont race huh :cheers:

You're absoulutely right, but its all about having fun too...

After taking a look around, most of the bikes are moded in one way or another. The front runners are fast, but so are their bikes. Lot had pipes and shocks, and who know what else for engine work.

Once i get proper gearing on it for 1/5 mile it will make a huge difference. I didn't really get into the powerband until the end of the small straight and then it was time to turn in again.

You dont race huh :cheers:

Actually I placed Second in both of my classes for the year in the AHRMA NW Lumberjack series.

Alex

1 Get the frame tied together under the motor

2 Get the axle all the way to the front (short wheelbase)

3 I never could ride mine with forks flipped it turned in great but back snapped out under power instead lowwer forks in clamps or limit fork travel internally

4 Make sure chain is as free as possible can't waste hp on o ring chain also you can change it to 420 with xr80 sprockets you said need gearing nows a good time

5 hidden motor mods atc200 carb,cam,lighten flywheel,pod filter,

6 14/50 is close on gear start in second run 2nd thruout you want her wound tight so it will slow down against compression

My son started flattracking on xr100 we have moved on but I still ride maddog on it sometimes.You really need a rear shock.And a pipe would help alot!

Have fun with it.protect the bottom they will have to be flying to pass you outside.Work on your starts!

Bob

Thanks Bob, that's some good advice...2nd gear start is necessary, at least for me. I did try 1st for giggles, but almost ended up on my head and blew that race on the start. I'll be sticking to 2nd gear launches from now on :thumbsup:

I didn't think about using the smaller xr80 chain and sprockets. I had already ordered the 428 size so i'll be using them. I got a fmf pipe, uni filter, and jettting on the way. I'll be racing it again this weekend.

What are you using to tie the frame together? Is this the BBR frame brace i've read about? I know a welder and could probably get him to fabricate something.

I'll be there on Saturday with the Eastern NC guys. I ride a lot with them on our practice tracks, but the only other race I have done with SEMDTRA was the indoors in Florence this past January. If I race, I'll be in the stock 100 class on my stock bike, leaving the Mod bike at home. "If I race" being dependent on if I can walk or otherwise move after Supermoto at Summit Point, WV the day before! I probably should race, my buddy Robert Lewis #68 says he isn't going to run the stock 100s this time he thinks, so everyone's chances of winning just got a lot better!

I'll be there on Saturday with the Eastern NC guys. I ride a lot with them on our practice tracks, but the only other race I have done with SEMDTRA was the indoors in Florence this past January. If I race, I'll be in the stock 100 class on my stock bike, leaving the Mod bike at home. "If I race" being dependent on if I can walk or otherwise move after Supermoto at Summit Point, WV the day before! I probably should race, my buddy Robert Lewis #68 says he isn't going to run the stock 100s this time he thinks, so everyone's chances of winning just got a lot better!

There are definitely some fast guys out there. Dirt track is whole 'nother world compared to road racing, which is my background. BTW, i use to live in VA and have ridden SP many times. The Shenandoah course would be amazing on a supermoto for sure, it was hella fun on an SV.

I got good riding tips from some other guys, but with only 30 laps under my belt i've got a lot to learn. I run the stock bike in both classes just to get seat time and have fun...but i see how this, just like any racing, gets pretty competetive - hence the upcoming mods :thumbsup:

I'll be on bike 97, stop by and say hello. I should be with some other Charlotte and Apex guys.

-Tim

Your on the right track! Yep you and a welder can hook the frame together, look at banke performance I copied theirs myself.I like to run xr80 16 inch front wheel also helps the little bike turn into the corner better and a little lighter than the stock 19.There are posts on here that show how much wieght you can get off the flywheel, it really helps.I ran a inner rotor ign. for awhile but like the lightened flywheel better.I found some old handle bar setbacks, I use them to move the handlebars up 1 inch and forward 2 inch, this opens up the cockpit alot and gives you knee room.

Good luck we are off to Wichita KS to runn 3 races in 3 days with the "Great Plains Flattrack Series"

Cyaaaaaaaa Bob

I forgot what number you were, so I also forgot to say hey! But I got some video of you in the race. I don't think you were in my heat. Looking at your bike, you can tell we are both from some form of pavement background. All my buddies hate my handguards when they ride my bike. I like them! :thumbsup:

Yep, I am the dude that caused the restart after feelin the pinch. Tried to get around my buddy Mike Wheeler, and didn't quite expect him to let off that quick. Oops! :confused: Least I can walk now, the 3 hour ride home SUCKED!

You going to Neeses? My bud Erick Baker is trying to talk me into going. Not sure what I am going to do!

We have 4 practice tracks in our little area here near Rocky Mount/Tarboro/Wilson. If you ever want to come out and ride with us, let me know! It is usually Me, Erick and Ben Baker, Robert Lewis, Troy, Austin, and Ervin and George Brewer, Mike Wheeler and some newer guys that are setting up bikes. 2 cushion and 2 clay. My track is sort of a weird mix.

Gerry

Great footage Gerry! That's me in the blue shirt you past on the last lap :confused: Way to work up the pack. You know that was a money race, right? Ha ha, I guess i won $15, so you might have got 20-25 for second? :worthy:

I won't be making it to Neeses, but will try and hit as many as the other rounds and go up to Coleridge as family time permits.

Thanks for the invite! Dirt track is just a ton of fun, and a whole new challenge. I need to work on my body position and relaxing a bit. I wish there was a track nearby, you guys are probably 4hrs from Charlotte. :thumbsup:

Robert came over and helped me with the carb. What a guy. I thought the float needle was stuck, so we pulled the bowl and everything was actuating properly, but there was some junk in the cavity where the valve seats causing fuel to overflow. duh! I'm still working on jetting since putting the pipe and filter on it. It was running really rich and sputtering off idle, and getting on the gas. I tried a ton of different combination....leaving me scratching my head. After looking at it closely, the needle jet was bent, musta got tweeked putting it back together at the track, that's when it started acting up mysteriously. Don't work on carbs with adrenaline running in the blood stream :busted: I straightened it out the best i could and moved the clip up since the plug was black. Soaked the carb overnight, put the larger 38 pilot in and runs pretty good down low now, the stumble off idle is gone. There's a bit of sputtering up top on the main so i ordered a 100 and 102 jets and a new needle and clip to be safe. Once i get the bike running right, i can get that out of my head and work on riding the damn thing....Almost there!

Oh and if anyone has a set of xr100 forks for sale, straight, no dings, 2000+ would be nice, let me know, mine are pretty bent.

Edited by MrStinky

WOw I gotta try flattrack one day.:thumbsup:

WOw I gotta try flattrack one day.:thumbsup:

Yea you should. Spoon on a set a tires and you're good to go. After watching the video its looks pretty easy, but man, let me tell you its way harder than it looks. I went in saying how hard can it be? Coming from road racing, i personally think its a huge challenge to go fast. I have a lot to learn, and unlearn, from riding on pavement.

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