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Search: Posts Made By: Luke
Forum: Racing 09-23-2014, 12:43 PM
Replies: 652
Views: 59,797
Posted By Luke
Not so much. :D I'm still racing. About to...

Not so much. :D

I'm still racing. About to wrap up another season; I have to miss the next race and then there's one left after that that I'm hoping to have a new bike ready for.


I don't...
Forum: Thumpers 09-23-2014, 12:28 AM
Replies: 4
Views: 339
Posted By Luke
The weight of the bike isn't really that...

The weight of the bike isn't really that important for figuring out the spring rate. Most important are the swingarm leverage and amount of suspension travel, followed in distant third by the...
Forum: Pacific Northwet - Where it's green. And wet. 09-16-2014, 10:10 PM
Replies: 40
Views: 1,169
Posted By Luke
I had not seen this side of you. My day has...

I had not seen this side of you. My day has been widened.
Forum: Pacific Northwet - Where it's green. And wet. 09-16-2014, 04:46 PM
Replies: 40
Views: 1,169
Posted By Luke
Did you find yourself a lah-tay?

Did you find yourself a lah-tay?
Forum: Pacific Northwet - Where it's green. And wet. 09-16-2014, 03:58 PM
Replies: 40
Views: 1,169
Posted By Luke
Yes, they are usually in towns. Hope that...

Yes, they are usually in towns. Hope that helps.
Forum: Pacific Northwet - Where it's green. And wet. 09-16-2014, 03:43 PM
Replies: 40
Views: 1,169
Posted By Luke
It starts in Dorris. Details are in the thread...

It starts in Dorris. Details are in the thread you started.
Forum: Pacific Northwet - Where it's green. And wet. 09-15-2014, 10:34 PM
Replies: 13
Views: 650
Posted By Luke
The South end is at Dorris, CA. From there, go...

The South end is at Dorris, CA. From there, go West on Picard Rd, it turns north and changes name to Topsey Rd, goes up the east side of the Klamath River until it hits 66.

Then take 66 30...
Forum: Some Assembly Required 09-14-2014, 09:45 PM
Replies: 576
Views: 106,765
Posted By Luke
I have had a year. And I'm ashamed to admit...

I have had a year. And I'm ashamed to admit that I haven't done anything to the bike since.


Well, not anything constructive, anyway. I did ride it in the Desert 100 again, destroying...
Forum: Pacific Northwet - Where it's green. And wet. 09-12-2014, 11:53 AM
Replies: 17
Views: 1,277
Posted By Luke
Halfway through the second lap I was wishing for...

Halfway through the second lap I was wishing for the massage tent. :lol3
Forum: Pacific Northwet - Where it's green. And wet. 09-09-2014, 11:32 PM
Replies: 17
Views: 1,277
Posted By Luke
In! I can already taste the dust.

In!


I can already taste the dust.
Forum: The Garage 09-08-2014, 02:29 PM
Replies: 15
Views: 1,533
Posted By Luke
+1 a single large radius 90* bend instead of...

+1

a single large radius 90* bend instead of two tight 45* bends would be the way to go.
I wouldn't do any of the perimeter bends either. Just cut and reweld. Otherwise the errors from each...
Forum: The Garage 09-05-2014, 10:04 PM
Replies: 15
Views: 1,533
Posted By Luke
3/16" will bend just fine in a press brake. ...

3/16" will bend just fine in a press brake. That's what what my CB skid plate is. However, the bend radius is pretty big. If you score the metal then all the bending will happen in the area where...
Forum: Pacific Northwet - Where it's green. And wet. 09-05-2014, 09:35 PM
Replies: 15
Views: 759
Posted By Luke
That goes so far past wrong it's almost back to...

That goes so far past wrong it's almost back to right. :lol3


I wonder if Goodwill has hip waders?
Forum: Thumpers 09-05-2014, 11:41 AM
Replies: 3
Views: 352
Posted By Luke
I had good results on a KTM 640. That is a...

I had good results on a KTM 640. That is a pretty viby motor with rubber mounted handlebars. I just added a lot of weight to the bar ends and it smoothed it right out- except at idle, where it...
Forum: Thumpers 09-05-2014, 11:30 AM
Replies: 5
Views: 409
Posted By Luke
Yes. Sounds like it's time for a new...

Yes.


Sounds like it's time for a new stator. I'd look at the old one to figure out what's wrong with it. Could be it just burnt out on its own, or it could be that it was damaged in some...
Forum: Thumpers 09-04-2014, 12:55 PM
Replies: 5
Views: 409
Posted By Luke
There's no spec for the resistance in the manual....

There's no spec for the resistance in the manual. It calls for a voltage measurement instead. My stator is 90 ohms on the exciter coil and 235 on the pulser coil. That's on a cold motor. They...
Forum: Racing 09-03-2014, 08:30 PM
Replies: 526
Views: 76,778
Posted By Luke
Dug my camera out of my bag and found a few...

Dug my camera out of my bag and found a few action shots from the Big K. They're all from the first race.

http://drduck.smugmug.com/Motorcycles/Vintage-Racing/i-jJ4TsJG/0/L/IMG_1489-L.jpg
...
Forum: The Garage 08-21-2014, 06:10 PM
Replies: 4,261
Views: 568,611
Posted By Luke
I used some 4047 rod on a casting once, it worked...

I used some 4047 rod on a casting once, it worked great. It was a pretty nice casting though, so any rod probably would have worked ok.

I was persuaded to try that rod by this:
...
Forum: Pacific Northwet - Where it's green. And wet. 08-20-2014, 03:12 PM
Replies: 4,494
Views: 330,533
Posted By Luke
Welcome. The local dirt bike parks are the...

Welcome.

The local dirt bike parks are the Tillamook State Forest which is about 45 min west of Beaverton on Hwy 6. Biped and I are going there Saturday. Feel free to join us. There are a lot of...
Forum: Pacific Northwet - Where it's green. And wet. 08-20-2014, 02:52 PM
Replies: 4,494
Views: 330,533
Posted By Luke
Sounds good. I assume trails are TBD depending...

Sounds good. I assume trails are TBD depending on who else shows up?
Forum: The Garage 08-20-2014, 02:34 PM
Replies: 46
Views: 3,039
Posted By Luke
Regarding the damping math, let me rephrase it a...

Regarding the damping math, let me rephrase it a little.

Damping Force = Damping Coefficient * Velocity

Linear damping is where the Damping Coefficient is constant.
Digressive damping is...
Forum: Pacific Northwet - Where it's green. And wet. 08-20-2014, 09:08 AM
Replies: 5
Views: 746
Posted By Luke
I kept reading this as 'I DON'T know why'. And...

I kept reading this as 'I DON'T know why'. And I'm thinking of a lot of really good reasons why not. Two of them were in the rest of your post. :lol3



I use a mountain bike shock pump. ...
Forum: The Garage 08-19-2014, 09:53 PM
Replies: 46
Views: 3,039
Posted By Luke
The only forks I've seen with damping that was...

The only forks I've seen with damping that was position sensitive were really old damper rod forks from the 70s. The cartridge forks that I've seen all had damping that was totally independent of...
Forum: Thumpers 08-19-2014, 01:59 PM
Replies: 7
Views: 553
Posted By Luke
You can put the jt part number into their catalog...

You can put the jt part number into their catalog and it will tell you which bikes it's used on.


http://www.jtsprockets.com/fileadmin/res/jtlogo.jpg (http://www.jtsprockets.com/)

...
Forum: The Garage 08-19-2014, 01:50 PM
Replies: 46
Views: 3,039
Posted By Luke
Oh yeah, back to your actual problem. I'd...

Oh yeah, back to your actual problem. I'd start by putting in lighter fork oil. It's a cheap and easy test. It will have the biggest effect on your low speed damping, which is the first place...
Forum: The Garage 08-19-2014, 01:35 PM
Replies: 46
Views: 3,039
Posted By Luke
The sag numbers I posted above do give an exact...

The sag numbers I posted above do give an exact spring rate. The numbers were created for tuning 2-300# dirt bikes so the rate may or may not be correct. However they are also used for the big...
Forum: Pacific Northwet - Where it's green. And wet. 08-19-2014, 10:24 AM
Replies: 4,494
Views: 330,533
Posted By Luke
In.

In.
Forum: Some Assembly Required 08-18-2014, 09:12 PM
Replies: 33
Views: 3,625
Posted By Luke
I don't know of any 2-stroke that's air cooled...

I don't know of any 2-stroke that's air cooled and e-start. There are some rope start quad motors though :D. If you want to go 4-stroke there are lots of little chinese crate motors available, many...
Forum: The Garage 08-17-2014, 09:06 PM
Replies: 46
Views: 3,039
Posted By Luke
The sag % numbers that I listed in my post above...

The sag % numbers that I listed in my post above are based off of what I have heard from several professional suspension tuners. I have never heard an explanation as to why, they just seem to be...
Forum: The Garage 08-17-2014, 01:24 PM
Replies: 46
Views: 3,039
Posted By Luke
I'm slowly figuring things out as I tune...

I'm slowly figuring things out as I tune different bikes and am on to a basic method.

Rear sag is set to 10% unloaded, 33% loaded. Front sag is set to 10% unloaded, 25% loaded. This defines...
Forum: Thumpers 08-07-2014, 07:05 PM
Replies: 8,416
Views: 1,662,036
Posted By Luke
I think it was more that some gears had different...

I think it was more that some gears had different numbers of dogs. I have a TRX transmission sitting around you can have if you haven't already bought one. Sorry, the XR transmission is in the bike....
Forum: Thumpers 08-06-2014, 10:49 PM
Replies: 8,416
Views: 1,662,036
Posted By Luke
I tried doing this when I was building an XR/TRX...

I tried doing this when I was building an XR/TRX hybrid and the best set of gears wouldn't work because the dogs don't match. There was some combination that would have worked, but I didn't use it. ...
Forum: The Garage 07-30-2014, 11:46 AM
Replies: 12
Views: 1,029
Posted By Luke
Alcohol. Pour a cup or two in the tank...

Alcohol.


Pour a cup or two in the tank and slosh it around to mix with the gas, then pour it out and rinse with water. The gas-alcohol mix is water soluble so it rinses out really well. I've...
Forum: Pacific Northwet - Where it's green. And wet. 07-24-2014, 06:52 PM
Replies: 4,494
Views: 330,533
Posted By Luke
Yes, I called and checked. If you want to car...

Yes, I called and checked. If you want to car pool let me know, I PMed my contact info.
Forum: Some Assembly Required 07-22-2014, 06:27 PM
Replies: 139
Views: 27,078
Posted By Luke
Ye-haw! :lol3 I got the tuning for whoops...

Ye-haw! :lol3

I got the tuning for whoops right on one bike, half by accident. The rest feel about how yours looks. I should probably tear it down and see what's right about it.
Forum: Pacific Northwet - Where it's green. And wet. 07-22-2014, 03:00 PM
Replies: 4,494
Views: 330,533
Posted By Luke
PBS, huh? You guys really liked the...

PBS, huh?

You guys really liked the sidehills this year. :lol3


http://drduck.smugmug.com/Motorcycles/Tillamook-Dirt-Rides/i-vHs2bXK/0/X2/ae40-X2.jpg



That was a nice course. Except...
Forum: Pacific Northwet - Where it's green. And wet. 07-22-2014, 02:24 PM
Replies: 4,494
Views: 330,533
Posted By Luke
Out of curiosity, what were the expert splits? ...

Out of curiosity, what were the expert splits? I saw the one just after Benny Hill (Piggyback, I think) and another at the bottom half of Pumpkin Patch. I remember seeing others, but not where...
Forum: Pacific Northwet - Where it's green. And wet. 07-22-2014, 01:39 PM
Replies: 4,494
Views: 330,533
Posted By Luke
The default is that OHV trails all close during...

The default is that OHV trails all close during fire season.
Most designated OHV trails in TSF are open by a waiver. There's a map posted at the staging areas showing what's open. All the ...
Forum: Pacific Northwet - Where it's green. And wet. 07-22-2014, 01:31 PM
Replies: 4,494
Views: 330,533
Posted By Luke
For non-leisurely track riders, Twinduro and I...

For non-leisurely track riders, Twinduro and I are meeting at Riverdale MX (http://www.riverdaleraceway.com/node/104) this Saturday for a practice day on their vintage track. The owner said the...
Forum: Pacific Northwet - Where it's green. And wet. 07-22-2014, 01:15 PM
Replies: 4,494
Views: 330,533
Posted By Luke
It's been open in it's current incarnation for a...

It's been open in it's current incarnation for a couple of months now. Never been in, but should check it out.
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