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Old 09-18-2010, 08:28 PM   #1
HighFive OP
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Highfive - WRR Athena Big Bore Project

Hhhmmm....what's this waiting on the Rancho Highfive doorstep?



Could it be...



Yes indeed! My Athena 290 Big Bore Kit has arrived....along with a couple of companions. A pretty little pair of Power Commander V and AutoTune units. And very quickly, I'm beginning to feel like this:



So, let's dive in ! ! !


I am going to use this thread to document a step by step procedure for the installation of this Athena 290 Big Bore into my Yamaha WR250R. Lots of folks have asked me for a detailed pictorial and explanation. So, here you go! I'll take you through my very own "discovery process" as I disassemble my stock engine, and replace it with this bad boy. I'll also include my tuning procedures all the way through completion.

You will notice I perform all of these procedures in my little 'ol cramped & messy garage floor. Nothing fancy about it. But someday, I hope to improve on that.

Fill your popcorn and get a big drink....then kick back and enjoy the show. I will share some of my own little tricks along the way, which might make your wrenching efforts a little easier too. I've never dug so deep into this bike before, so we are bound to learn some interesting things together.

Here we go....let's find out if this box of goodies is worth the expense.

HF
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'13 Husky TR650 Terra, '11 Husaberg FE390, '10 BMW F800GS, '71 Honda CL70
Terra-izing the CDR Bergs Over the Rainbow Texas or Bust!
Rocky Mountain HighFive The Other Side of Nowhere
Athena Big Bore Project WRRDualsport.com

HighFive screwed with this post 09-18-2010 at 10:45 PM
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Old 09-18-2010, 08:56 PM   #2
emerson.biguns
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Mine came today.

Doesn't look like yours....





I'll follow your lead.



.
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Old 09-18-2010, 09:01 PM   #3
cyborg
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Ooooh, Auto-tune!

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Old 09-18-2010, 10:47 PM   #4
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Quote:
Originally Posted by emerson.biguns
Mine came today.

Doesn't look like yours....



.
Gee....EB, I think you got a "used" one.

HF
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'13 Husky TR650 Terra, '11 Husaberg FE390, '10 BMW F800GS, '71 Honda CL70
Terra-izing the CDR Bergs Over the Rainbow Texas or Bust!
Rocky Mountain HighFive The Other Side of Nowhere
Athena Big Bore Project WRRDualsport.com
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Old 09-18-2010, 10:55 PM   #5
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Quote:
Originally Posted by cyborg
Ooooh, Auto-tune!
You know I had to make you jealous, Cyborg. Its the rules!

Quote:
Originally Posted by Chadx
In.
Figured you might need a good winter project, Chadx. Its calling your name...

Quote:
Originally Posted by ronvan
Allright ronvan, glad you're peeking over my shoulder.

HF
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'13 Husky TR650 Terra, '11 Husaberg FE390, '10 BMW F800GS, '71 Honda CL70
Terra-izing the CDR Bergs Over the Rainbow Texas or Bust!
Rocky Mountain HighFive The Other Side of Nowhere
Athena Big Bore Project WRRDualsport.com
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Old 09-18-2010, 11:00 PM   #6
Fubars
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Old 09-19-2010, 01:14 AM   #7
Mr. Fisherman
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Old 09-18-2010, 09:14 PM   #8
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First, let's see what's inside the box.







This new piston seems very light, and only has grooves for one compression ring plus one set of oil rings. The stock piston uses two compression rings (as we'll see later). Not sure if this is any issue for concern. "Back in the day" seems we ran one compression ring in lots of stuff. But what do I know.

I was going to weigh all this stuff (for Machtig), but I didn't have a gram scale, and well, I got antsy to install it. So, somebody else do that step when they get theirs (hint...hint....Emmerson Bigguns). We'd all like to compare the weight of the stock piston/ring/wristpin to the Athena version of same. You can add the results right into this thread....that's what's its for.

The Athena kit comes with a completely new casted aluminum cylinder. It is not a sleeve kit for your original stock cylinder. You swap out your cylinder assembly entirely. The nice thing about that is...if I don't like it, I could swap back to my stock assembly later.

Well, it was a good thought.

The Athena kit also comes with a very complete set of gaskets & washers, plus a custom electronic fuel programmer, which is needed for the larger motor (if you don't have another similar capable unit already). I won't be needing this item, as I have also purchased the much more sophisticated Dynojet Power Commander V fuel programmer, and the AutoTune unit. I'll get into those items later. For now, let's start wrenching.


Where do we begin? I guess right here:



Remove your seat, tank, & sidecovers. Then, remove the pipe (this is my FMF Q4 +Powerbomb Header). I love this thing, because it really works well, sounds sweet, and is SUPER lightweight compared to the stock pipe.



Whether stock or aftermarket pipe, make sure you carefully remove this thick washer from your exhaust port on the head.





Next up, the radiator removal...

HF
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'13 Husky TR650 Terra, '11 Husaberg FE390, '10 BMW F800GS, '71 Honda CL70
Terra-izing the CDR Bergs Over the Rainbow Texas or Bust!
Rocky Mountain HighFive The Other Side of Nowhere
Athena Big Bore Project WRRDualsport.com

HighFive screwed with this post 09-19-2010 at 05:58 AM
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Old 09-18-2010, 09:19 PM   #9
Chadx
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Old 09-18-2010, 09:25 PM   #10
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Old 09-18-2010, 10:33 PM   #11
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If I can do this, then you can too! That will be our "Motto" for this Thread.

I'm not an expert mechanic with a fancy shop full of specialized tools. Don't even have one of those big hydraulic bike lifts that puts the motor at chest height...for a good looksee. Usually, I just sit on my butt on the garage floor, getting a crick in my neck, and grease in my eye, as I probe around in places I probably shouldn't.

The difference, I reckon, is that I'm not afraid of messing something up. I kind of like messing things up, then seeing if I can un-mess the mess I've made. Which usually just leaves in....well....a big mess.

But, if I can, then you can too. Let's keep our focus here and continue...

On deck, is this big hunk of aluminum hazardous waste:



Aaaaaagh.....the dreaded radiator removal ! ! ! I hear lots of people skeeeered to remove this thing. Guess what? It ain't no big deal. In fact, its real easy. Just three bolts and two hose connections (drain the fluid) and voila, its off the bike easy as pie! Really.

If you have a radiator guard, like my "Force" brand, then one of these long socket extension will make this task soooooo much easier.



To do this:



Without the extension, its nearly impossible to reach that frame bolt/nut. Ask me how I know....

So, that's a great TRICK. And, here's another one. Are you tired of making a royal mess when you pull the hose on the water pump to drain your radiator? Try this TRICK:



It helps A LOT. Just hang a cloth rag beneath where your hose will drain (when you pull it loose), whatever fluid splashes out will soak into the rag and drain into your pan. It acts like a conduit for the fluid to follow. This is helpful, because fluid will continue to exit the water pump discharge on the motor as it drains from all the engine ports (slowly). Practice makes perfect....so you'll get better at it with each attempt.

While we're at it, here's another little TRICK related to the Force Radiator Guard. My radiator wiggles back and forth within the mounts, rubbing and rattling against the guard itself. So, I just cinched it down tighter to the outside edge with this super duper, high-tech, zip-ty like this:



Probably seems elementary.....so just rank it in that "why didn't I think of that" category. Don't ask me how long I rode around until I fixed this issue.

Seems I'm on a roll, so here's another top secret HF TRICK:



Put a towel on the floor beneath your bike. Its wonderful...
Keeps those nuts & bolts from flying across the garage floor....disappearing into the abyss....when you drop them. When they hit the towel, its with a thud, not a ping, and the little guys are always just sitting there smiling up at me.

HF

p.s.....notice that circular container with the dividers. I bought a handful of those thingys (real cheap) at Home Depot. Terrific for keeping bolts & nuts sorted during a project like this. I put all the bolts from one general area in the same section.....like everything radiator related goes in one bin, while everything cylinder/head related would go in another. You get the idea. Old farts like me need all the memory aids we can muster.....as you'll soon see.

p.s.squared......please notice there are two separate distribution lines coming from this radiator.



This could be surprising & confusing, if you weren't expecting it. I'll show you where the "little guy" goes and what its for....tomorrow.
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'13 Husky TR650 Terra, '11 Husaberg FE390, '10 BMW F800GS, '71 Honda CL70
Terra-izing the CDR Bergs Over the Rainbow Texas or Bust!
Rocky Mountain HighFive The Other Side of Nowhere
Athena Big Bore Project WRRDualsport.com

HighFive screwed with this post 09-19-2010 at 06:09 AM
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Old 08-30-2011, 03:52 PM   #12
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I might ought to mention, there was one other difference in my bike between Dyno 1 & 2 vs. Dyno 3 runs.

My first two runs were made with Krause Racing Ti sprockets and Sidewinder Smart-chain. Just before the Dyno 3 run, I changed to Supersprox combo with RK-xwring chain. Kept the exact same gearing ratio at 13/46, but only had about 300 miles on new chain & sprockets prior to Dyno3.

If anything, I would expect the heavier (new) chain and sprockets to yield more drag. The Sidewinder combo is claimed to add about 1.5 hp. So, I might of had an even better result running the original combo, but it was totally worn out.

Doesn't really matter to me, but I thought you ought to be made aware of these minor changes which could have affected test results (slightly). FWIW

HF
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'13 Husky TR650 Terra, '11 Husaberg FE390, '10 BMW F800GS, '71 Honda CL70
Terra-izing the CDR Bergs Over the Rainbow Texas or Bust!
Rocky Mountain HighFive The Other Side of Nowhere
Athena Big Bore Project WRRDualsport.com
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Old 08-30-2011, 05:16 PM   #13
Gany
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Thank you Highfive for your detailed posts. I know these things come at some expense if dyno costs are anything like they are in Australia.

Have you noticed much of a difference long term now regarding fuel consumption compared to stock?
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Old 09-01-2011, 08:09 AM   #14
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Originally Posted by Gany View Post
Thank you Highfive for your detailed posts. I know these things come at some expense if dyno costs are anything like they are in Australia.

Have you noticed much of a difference long term now regarding fuel consumption compared to stock?
Yes indeed, they are. Think my project costs have exceeded intentions. But, that gnawing quest to know....

Guess I should have charged admission. I'll gladly accept papypal donations and start another project.


I have not measured fuel consumption yet. But, I guess I can do that now. I was averaging about 55 mpg (+/-) previously. Give me some time, and I'll report back later.

HF
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'13 Husky TR650 Terra, '11 Husaberg FE390, '10 BMW F800GS, '71 Honda CL70
Terra-izing the CDR Bergs Over the Rainbow Texas or Bust!
Rocky Mountain HighFive The Other Side of Nowhere
Athena Big Bore Project WRRDualsport.com
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Old 09-01-2011, 07:43 PM   #15
reddirtjoe
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Cycle World magazine, June 11 issue.
They added a Athena big bore kit too.
(plus GYTR Slip on muffler,gearing changed to 13/49, EFI box?)

Anyway, H.P. went from 28 stock to 33
Torque went from 17 to 22

Most likely on a different dyno and different weather then HighFive's, but you get the idea of improvements made by the big bore kit!!
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