Street/Strip XSR 700 Build

[blackout]

1 hour ago, shinyribs said:

Blackout, the pipes look great, man! 

"Designing" for scavenging and such...I know there's some hard science involved, but I think it mostly falls in to trial and error, especially in the home shop. 

A short while ago I hung a pair of CRF 250 mufflers on a slightly built XR400. Only because i thought it would look cool for a sumo to have twin cans. That engine ( single cylinder) had twin exhaust ports, so the stock arrangement was 2 into 1. The CRF twin muffler assembly fit up to the stock slip joint location, so I ended up with 2 - 1 - 2  by default. Given the stock muffler was wide open and notoriously loud, I was mainly shooting for looks and a quieter exhaust. Certainly didn't expect any performance increase due to flow alone. Surprisingly, the bike absolutely ripped with that setup. I mean, wheelies in 4th with no clutching up and high rpm throttle response was noticably improved. I had to up the main jet and play with the needle height a bit, but low rpm function was completely preserved. Lucky strike, but it was awesome. It's very rewarding to come up with your own thing and discover that you landed on something that works really good. Hotridding at it's core! Keep at it! 

 

Beautiful bike!

[FrodoFZ]

 Totally digging it man, good job! Reminds me of the first gen Ducati Monster with those pipes.

[blackout]

I fabricated an adapter to mount Woodcraft pegs to the stock rearset plates.  I used .75" x 1" 6061 aluminum bar that I had laying around.  Simple design requiring no special tools. If I had drilled the pivot hole properly,  I wouldn't have needed to add the bolt that takes up the extra play. 

I do need to do some at home black anodizing on some of these parts.

[blackout]

I guess I should have known this, but the bike moves too much when just hung.   Now with the rigid pegs I can support the rear of the bike using the pegs.   The bike is still hung for when I have to loosen or remove the rearset plates. 

With the swingarm off, I can confirm I like the way Yamaha packaged the pivot location and mounting method.  

[blackout]

This is a picture of the right side of the engine where the swingarm pivot is.  Note the blue taped bushing and the engine lug clearance.  My new swingarm design can use an eccentric bushing that would move the pivot 5/16" higher.  But, there would be interference with the engine lug.  I assume this engine lug is used for positioning purposes during assembly at the factory.

My question is, is there a use for this lug in the event of an engine rebuild?  Thanks for any insight. 

The reason for raising the pivot location would be to increase swingarm angle, therefore geometric anti-squat.   Any lengthening and lowering of bikes removes anti-squat, so it makes sense to design in more if possible.

[mossrider]

1 hour ago, blackout said:

is there a use for this lug

No.

Be gone with it.

[blackout]

Swingarm pivot on the jig mostly done.  Accurate and robust are more important than looks for a welding jig.  Lol

[bornagainbiker]

14 hours ago, blackout said:

Swingarm pivot on the jig mostly done.  Accurate and robust are more important than looks for a welding jig.  Lol

It certainly does look robust. 

[blackout]

I modified the stock bellcrank to accept standard spherical rodends.  This way an adjustable link is real easy.  Used 1/8" thick stainless steel 17-4PH plate.   Much stronger than standard 304 stainless.  With the longer swingarm I have no idea what length link will be needed.  But I'm hoping to package a double adjustable link.  One that can adjust ride height without removing one end.

[mossrider]

At least one of us gets to keep his man card this winter. This is great stuff, carry on. 

[blackout]

All that padding to take up room for the XSR700 tank covers, it's too bad Yamaha didn't just do a new larger tank....

Pulling parts to get the airbox out in one piece. 

Still not positive which fuel controller to go with.

While I mentioned nitrous earlier, been thinking about a Rotrex supercharger for next winter.  

[blackout]

I got my "old" Hordpower air box installed.  This is a high quality piece.  I had it on my FZ07R and then took it apart to use the front plate for my first cold air intake.   It traveled in my spare parts bin to the track last year.  And now I put it back together, cleaned the original filter, and it looks like a new part on my XSR700!

[klx678]

I was curious why Hord Racing calls it an air box when it is simply an open filter element with a mount brakcket fitted , not enclosed in any sort of box.   Any takers?

 

[blackout]

12 minutes ago, klx678 said:

I was curious why Hord Racing calls it an air box when it is simply an open filter element with a mount brakcket fitted , not enclosed in any sort of box.   Any takers?

 

1. The crank case vent is vented into the Hord box like the stock setup.

2. It feeds both throttle bodies and does indeed have a somewhat large air capacity within the filter compared to a pod filter.

3. It incorporates machined velocity stacks to provide a dyno tuned air flow. 

[mossrider]

4. It works.

[randy2100]

15 hours ago, klx678 said:

I was curious why Hord Racing calls it an air box when it is simply an open filter element with a mount brakcket fitted , not enclosed in any sort of box.   Any takers?

 

Take a box and replace four of the sides with filter paper and you have a Hord air box.

[klx678]

Air box holds said air cleaner, open one and look.   Look in the K&N catalog and you won't see them listed as air boxes.    The reason I ask  was because of that.   You don't call shoes shoe boxes, because they are shoes and taking the place of the box that normally encloses them while new.   A hat isn't called a hat box because it is a hat without a box.

I guess they just didn't really want to call it the Hord air filter.  It would seem expensive for an air filter if one didn't realize the added features.

But really, by definition...  a box:  a container with a flat base and sides, typically square or rectangular and having a lid.  "a cereal box"

And just kinda messin' with ya.

 

Edited January 1, 2021 by klx678

[blackout]

6 hours ago, klx678 said:

Air box holds said air cleaner, open one and look.   Look in the K&N catalog and you won't see them listed as air boxes.    The reason I ask  was because of that.   You don't call shoes shoe boxes, because they are shoes and taking the place of the box that normally encloses them while new.   A hat isn't called a hat box because it is a hat without a box.

I guess they just didn't really want to call it the Hord air filter.  It would seem expensive for an air filter if one didn't realize the added features.

But really, by definition...  a box:  a container with a flat base and sides, typically square or rectangular and having a lid.  "a cereal box"

And just kinda messin' with ya.

 

What do shoes and hats have to do with making horsepower?  The Hordpower airbox functions as a well designed airbox where two pod filters do not, like explained previously. 

[blackout]

6 hours ago, klx678 said:

Air box holds said air cleaner, open one and look.   Look in the K&N catalog and you won't see them listed as air boxes.    The reason I ask  was because of that.   You don't call shoes shoe boxes, because they are shoes and taking the place of the box that normally encloses them while new.   A hat isn't called a hat box because it is a hat without a box.

I guess they just didn't really want to call it the Hord air filter.  It would seem expensive for an air filter if one didn't realize the added features.

But really, by definition...  a box:  a container with a flat base and sides, typically square or rectangular and having a lid.  "a cereal box"

And just kinda messin' with ya.

 

Oh also, many airboxes use a panel filter which makes up one side of the total box.  The Hord essentially uses 4 panel filters on 4 of the sides of the box.  A good engineer looks beyond the normal....

[stickshift]

On 1/1/2021 at 8:44 AM, klx678 said:

I was curious why Hord Racing calls it an air box when it is simply an open filter element with a mount brakcket fitted , not enclosed in any sort of box.   Any takers?

 

I guess the alternative would be to call it a Hord ‘filter’ but that would be doing a huge disservice to how the parts actually function.

Just like an air box it has intake runners tuned to maximise performance where the designer intended. The alloy CNC radiused bell mouths inside are pure moto porn!

[JBrock]

Can’t wait to see this thing when you’re done!

[klx678]

14 hours ago, stickshift said:

I guess the alternative would be to call it a Hord ‘filter’ but that would be doing a huge disservice to how the parts actually function.

Just like an air box it has intake runners tuned to maximise performance where the designer intended. The alloy CNC radiused bell mouths inside are pure moto porn!

I can go with that.  

[klx678]

21 hours ago, blackout said:

What do shoes and hats have to do with making horsepower?  The Hordpower airbox functions as a well designed airbox where two pod filters do not, like explained previously. 

A bit of a funny analogy...  that's all.  

[blackout]

Here is one option for an adjustable link.  It's as simple as it gets, one female rodend and one male.   Current length is stock with plenty of room to go shorter, higher rear height.  But, I need to go lower and not sure if this will go long enough before running out of threads.  No big deal, there are many other rodend setup options, just need to wait and see what length I need.  Either way, this is how the link will mount to the frame.

[blackout]

Here is how I decided to mount the pod-300.  I welded a plate to the stock XSR700 cosmetic piece that mounts in front of the ignition.  The pod-300 is a data logger.  It displays up to 4 parameters in real time.  And has 3 indicator lights that I will be using as a shift light.