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Old January 22nd, 2015, 10:08 PM   #1
madmaxmenon
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Talking Track Bike build questions

Hi all, i'm sure this has been covered before but I could not find a thread for it. I am looking to build a track bike and wanted to know what are the must have mods. I am looking to go racing on the cheap and hence the 250.
What I have in mind so far:
brake pads (suggestions?), steel braided lines and fairings.
Planning to get the woodcraft rear sets and clipons. They don't mention about gp-shift though. Leo vince full system and dynojet kit.
Do I gain much by changing the air filter?
What about chain and sprockets? I have heard of 515 sprockets for the 250, anyone use it? Is the stock gearing good enough? If I go -1 in the rear, do I lose a lot of initial grunt? Is it a huge gain over stock at the top end?

Cheers!
Menon
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Old January 22nd, 2015, 10:59 PM   #2
csmith12
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Welcome Max!

Have a look here.

Your main mods are;

Tires
Full Exhaust/Jetting
Hi-Flow filter
Front suspension
Front steel brake line
HH pads
Clipons
Rearsets
Track bodywork
Rear shock

In just about that order too.

Stick to stock gearing and customize as you see fit per track. I have tried all kinds of strange gearing, but always come back to stock. And... I aint really slow either.
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Old January 22nd, 2015, 11:36 PM   #3
corksil
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Track bodywork?

What does this entail?

Delete the front headlight to save weight and find aftermarket rear tail fairings?

A link is worth a thousand words.
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Old January 22nd, 2015, 11:44 PM   #4
csmith12
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Quote:
Originally Posted by corksil View Post
Track bodywork?

What does this entail?

Delete the front headlight to save weight and find aftermarket rear tail fairings?

A link is worth a thousand words.
http://www.hotbodiesracing.com/en/pr...-12_ninja_250r

Front/side fairing (minus all lights)
oil tight lower
Tail fairing (no tail light)

There are other brands of race/track bodywork, this is just one. Some riders hate hotbodies and prefer another brand.
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Old January 23rd, 2015, 05:37 PM   #5
madmaxmenon
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thanks much for the link csmith12! very helpful.
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Old January 23rd, 2015, 05:40 PM   #6
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sharkskinz
aerotech streamlining
hotbodies
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Old January 23rd, 2015, 08:24 PM   #7
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^ I can verify sharkskinz makes a quality product, my track gsxr has fairings from them on it and they look like they've held up very well through the bikes crashes
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Old January 23rd, 2015, 11:02 PM   #8
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honestly they're all pretty much the same. fiberglass isn't exactly rocket science... uhh... anymore...
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Old January 23rd, 2015, 11:05 PM   #9
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lmao what are they using now some form of material that absorbs energy from the sun yet still protects everything in the shuttle on descent?
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Old January 23rd, 2015, 11:07 PM   #10
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well they use lots of things. the rocket nozzle is made from something called niobium which doesn't melt until about 5000f. that's kinda cool and rocket sciencey.
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Old January 23rd, 2015, 11:09 PM   #11
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do they have the nozzle set up in such a way that it directs the airflow around the shuttle on descent? that'd be brilliant, they could get away with using materials that are a lot less heat resistant on the rest of the shuttle if they did that
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Old January 23rd, 2015, 11:10 PM   #12
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did you know that the original moon lander didn't use conventional rockets because they weren't sure of the reliability of starting it on the moon, so instead they used hydrogen peroxide engines which spray the peroxide onto a stainless steel catalist which splits it into hydrogen and oxygen gases and releases energy and increases pressure which is also whats used on old school submarine torpedoes which if you like movies, they made a movie about one called the widowmaker which had a peroxide leak in one of the torpedoes and it reacted with the side wall and caused an explosion... uhhhh... anyway. science!
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Old January 27th, 2015, 01:56 PM   #13
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Anyone used motofairings? They seem to be selling for ~$400 shipped. Reading online, it seems like a hit or miss. Trying to keep this cheap, so one option is to use the rashed oem fairings and get a belly pan. Is that something that's acceptable for the afm?

As far as the mods you guys mentioned, I had a few questions:
Tires - what is the size you use for the rear? I saw pirelli has only a 120/70
Suspension - For now i plan to keep the rear stock and change springs at the front for my weight. Maybe use a heavier oil?

Rest of the stuff I have ordered and should be here in the next few days.

Thanks again!
Menon
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Old January 27th, 2015, 02:56 PM   #14
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where in cali are you? just go pick up the fairings from hotbodies in poway and it costs like $300 end of the day
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