A/G 125 class build

[god of speed]

Greetings,

i am aspiring to set a record in the A/G motorcycle class with a kawasaki kr250 and aprilia 125 engine. my question is in relation to wheels. should i go spoked for low weight or cast alloy for longevity? 16/17/18"? as wide as possible for grip or as thin as possible for less resistance?

what do people normally run? some feedback from a voice of experience would be appreciated.

Thanks in advance

Charlie

[RGV]

Hi Charlie welcome aboard.
Weight isnt a problem, its actually better to be heavy (up to a point) mags are my choice, wouldnt like to see what the salt would do to a spoked wheel if it wasnt very well maintained.
The more streamlined the better so a small front tire, and you shouldnt have traction problems so i wouldnt go any bigger than standard on the rear.
I run an RGV250 and use standard size tires with as much tread down the center as i can get, eg: http://www.bridgestone.com/products/mot ... /bt45.html

Long Live 2 Strokes.

[god of speed]

hey thanks for the input, ive found a ninja 250 front end and zzr250 rear i might use, they look pretty light and not too wide.

another question, are we allowed to use coolant in the bikes or does it need to be water, i was hoping to actually use alcohol mixture for good cooling properties.

i still havent actually found an rg250 frame yet, i think ill post a wanted ad!

[momec3]

G'Day Charlie welcome aboard.
Coolant car or bike I would like you to look at Redline Water Wetta. Does not harm the enviroment and cools better than anything else on the market. Google it and form your own opinion. Its mandatory at Bonneville.

Chris

[god of speed]

Hey thanks chris, ill look into it, i dont like the idea of alcohol in a crash being spilt over my red hot engine.

any other tips that are obvious to you but not to s salt noob

[momec3]

"any other tips that are obvious to you"

Bring plenty of beer!

[god of speed]

well thats a given! haha

[god of speed]

do we need to run filters on the intakes or is the air clean enough on the salt?

[RGV]

I run a course filter more to settle the air in the air box than filter it.

Its pretty clean out there but it all depends on weather your carby can suck flicked up salt or not.

[Dr Goggles]

word of warning for the first time player.

Salt attracts water .That last bit that gets sucked into the intake and then ends up in the manifold, siting on top of a piston or resting on top of the valve will drag water out of the air and start chewing away moments after you shut the thing off..........residual salt from a spin corroded the valve seats on the Orange EL Falc of Daryl Chalmers one year , meant a whole reco of the head....

we haven't up until now but I'm planning on some sort of way of fitting a coarse filter to the tank......other than that a bit of a backyard "de-coke" probably never hurts either..

[god of speed]

a coarse filter on the tank?

[Dr Goggles]

Sorry, short for bellytank....

[momec3]

The blessed salt is in the wonderful atmosphere at the beautiful lake and filter or no filter it does get in.
I tend to drown the running motor with CRC when it is both finished speedweek then when it gets home. The shit gets everywhere and if your not going to strip it at home then dose it with LOTS of CRC.

No I don't run a filter..........

Chris

[grumm441]

Hey Charlie
Why don't you just run a complete Aprilia RS125
They have a pretty good shape and they are not that expensive
G

[god of speed]

Hey Charlie
Why don't you just run a complete Aprilia RS125
They have a pretty good shape and they are not that expensive
G

id just rather build my own bike, not just buy one, strip some stuff of it and go. this is more a learning excersize to increase experience in engineering and motorcycle tuning. the record is awesome but not that important to me. i just like the idea of building something myself that is completely unique and for one purpose.

besides the aprilia is over engineered, bulky twin spar frame with heavy plastic fairings, is not what i want. i am going for much less weight plus im going for about 30-40kmh faster than the aprilia top speed anyway.

i dont really call $4-5k cheap for a mid 90s 125. infact ive just got a kawasaki kr250 double cradle box aluminium frame for $300. my engine was 500, exhaust will be 600, plus engine mods and parts. it might add up to the same as a standard aprilia but it will be a purpose built salt machine instead of a road bike with rossi's gp stickers.

next question, does everyone who runs in the 'pump gas' class (commercially available) run the 10% ethanol fuel?