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At the Track Some Katana's see track duty. Some owners have multiple bikes. This is the place to chat about track days.

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Old 08-20-2016, 07:56 PM   #21
1FSTKAT
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That tubeless set up is genius. I've seen tubeless conversions on mountain bikes before but for some reason it never dawned on me to do it on a dirtbike.

This was the first of the couple of race bikes I built over the past two years.

http://imgur.com/a/X0cXe

(Had to post the album link, the photo size is massive)

unfortunately I blew up the transmission last december and never got around to reassembling it. Hence my newer red bike in the previous photo.

Word on the street is that Herrin Compound in conjunction with Amish Racing/Trackapalooza is offering a $2000 prize purse for this weekends races. Going to make my best effort to get up there.
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Old 08-23-2016, 08:07 PM   #22
ygolohcysp
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Dude, that's awesome! I have the BT-45's on my bike now. Just now trying them out for the first time. Put them on when I made the wheels tubeless. All 5 wheels still holding air so far. I did mess up the sticker over one spoke nipple on one of my drz400sm wheels. Oh well. As for the tires, because I was spinning the rear on turn exit, with 3-5 year old tires (likely the reason), I got the 130/70/17 rear tire for my 3.5" rear wheel. It fits, barely, but I had to add two extra chain links and move the rear axle back for it to clear the weld on the right side of the swingarm. If it was a steel swingarm, I'd modify it, but it's aluminum, and I haven't welded aluminum yet. I like the tires, but I'm not sold on the 130 rear with the axle moved back. It does feel stable, and the bike isn't as wheelie prone with the same gearing, but it does turn a little slower. That said, testing on Sunday, I scrubbed in the whole rear, edge to edge, and never had it slip. It doesn't even like sliding when downshifting two gears. Going down 3 provides predictable results.

For the rally last year, I almost brought the crf150f with me, with the intention of maybe taking one day and going to the Herrin compound. Thought about taking the 150f on the dragon. Instead, I took my pocket bike and rode it on the dragon, in the pouring rain. The Harley guys didn't wave back, and I passed a mini-van.

My brake mod worked perfectly. Not sure there was really that much improvement other than not the pin not contacting the rotor at all, but there were no downsides at all. The tubeless wheels will take some getting used to, and playing with air pressures.
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Old 09-13-2016, 06:53 PM   #23
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I went out with a couple of friends to a local Kart track on Labor day and made this video. Buddy in front of me has a TB120cc kit, i'm all stock.

Track is super fun, way less technical and demanding than Josh's place. Also only about an hour away instead of five.

https://www.youtube.com/watch?v=ZKnknpIBrOo
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Old 06-18-2017, 04:24 PM   #24
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Okay, time to update once again. I've suffered another engine failure, this time not as significant. Another issue that was hindering my engine longevity was the cam. Apparently, the powroll cam was produced by a company called web, which is known by a few people to produce cams for these engines that are too aggressive, and don't have a ramp on the back side to slow the closing of the valves. I noticed it myself this time by wear finally showing up on the cam lobes, but being suspiciously absent on the closing side of the lobes. It was the cam that came in the bike. This time, it broke the top of the valve off, so the valve dropped, got bent, broke the valve guide, and aside from little scarring, left the head and piston in tact.

I purchased a smaller lift cam from a known good company, but as always, decided to play a bit with the rebuild. I found an intake valve from a brand, Psychic, that was black oxide coated for reduced friction and already undercut with the head shape changed for better flow. That meant I didn't have to try doing that part myself, which I had planned.


In the time since my last update, I upgraded mills as well. The one I got is old and used, but it's a full size Bridgeport with a 9"x42" table. All I can say is wow, that mill runs nice. I haven't touched the small one since I got the full size. Anyway, the mill comes with with the head. There was small scaring around the edge of the head that provides the squish, so I decided to try my hand at milling the head down. I assembled the motor with clay on the piston, rotated through a couple cycles, and measured. I then milled the head and remeasured. I got the exhaust valve to piston clearance to .070". Perfect.



I also did more port work on the head, smoothing out the ridges where the valve seats stuck into the port. You know, the opposite end of the hardened material from where the valves sit. I also removed a fair bit more material from the intake side. Having tried it out since then, all I can say is WOW. The compression is definitely noticeable. I was already starting with a high compression piston. Now, the kick back on the kick starter is impressive when I get it wrong. In switching to a smaller lift cam, I managed to either hold the same power, or even increase it throughout the entire range. The porting work on the exhaust side also served to up the usable rpm limit quite a bit. Using GPS, I've clocked it at 63mph, and I ran out of road while the engine was still climbing. All in all, not bad for a 150 with a 5 speed.
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Old 06-18-2017, 08:04 PM   #25
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Thanks for the update, love seeing the pics with the mill. Super jealous, hope to someday have a workshop with something like that in it.
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Old 07-24-2017, 08:02 AM   #26
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Well, looks like I finally have a good reason to dump photobucket!

Windows 10 won't even let me get to the login page due to all the unsafe issues with their page and advertising. Maybe I'll eventually move the pictures somewhere else and redo the links for this thread. If anyone has any suggestions for hosting, let me know. Otherwise, I'll likely use imgur.com

On to other news, I finally got a cool new toy for making my practice a little more informative. A GPS lap timer! The software is a little buggy, but it does do a great job anyway. I can see what I'm doing where to save time, hit better speeds, where I brake to carry the most corner speed, etc. I've also learned how to merge the data with video, and finally learned the bare minimum of video editing. Just taking the raw video and merging the GPS data gives me a whole new perspective of where I'm shifting, where I can brake later, which turns I can take faster, etc. I'm just playing around with this.

https://youtu.be/6O1K7cyD4L4
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