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Old 09-26-2011, 02:54 AM   #1
God of Speed OP
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125cc Dry Lakes Racer 'The God of Speed'

For those of you wondering about my pompous username, i selected it because when i joined the forum i had intended on building a dry lakes racer after watching the worlds fastest indian, typical i know.

old Burt had a joke about the gods of speed and how he had to make offerings to them in order to have them on his side whilst breaking land speed records. so thats why i used it, anyway i am now building a bike, 'the The God of Speed.'

I started the project around September last year, researching constantly trying to decide which bike, engine, frame, class and fuel to run on. in the end i decided on 125cc, a/g. where the Australian record is around 170kmh and the world record is about 210 from memory. i fell the records in this class are within my capacities of engineering and budget.

the next big step was in January this year when i bought a used rotax 122 engine off ebay

this is the engine from an aprilia rs125, one of the highest hp/litre production street engines ever made.

and a few months later a Kawasaki kr250 frame after the advisement of some inmates here, (thanks Brendan).


next i set about putting it all together, getting quotes from engine builders, exhaust makes, frame modifiers, suspension builders and etc and piecing together just exactly how i am going to do this whilst studying full time and on a salary earnt from 2 days a week as a motorcycle salesman.

from the research i did, i found the best hardware to use for the desired application, i decided to go with the following:

v force carbon reeds


40mm mikuni tmx carb and custom manifold


tail from a honda rs125 gp bike


hpi fully programmable ignition
jollymoto aftermarket pipe for tuning.
i am also running total loss igntion and ram air induction.


anyway so i started selling off some of the parts i had lying around, as when i had bought the kr250 frame, it came basically as a complete basket case but i only needed the frame. so i listed all the parts on ebay.

one of the people who purchased some of the kawasaki barrels off me was a bloke called phil watkins, he is president of the classic and japanese motorcycle club, through our subsequent talking, we discussed the kawasaki frame and eventually we found out that we were both building 125cc land speed record machines. it was only obvious that we joined forces as there was no way i could afford all the things that need to be done, and phil didnt have time to oversee a project like this.

so the team was formed, utilizing the resources of the members of the club, who are mechanics, engineers, electronic specialists and ex-race engineers with me overseeing the project.

throughout the next few months we got the frame into an engineering workshop, HGC in coburg, and set about the frame mods,

this involved cutting the rear vertical supports out and welding in new ones, which will allow the airbox to sit lower.


cutting and welding the new engine mounts for the rotax engine.




we had a second frame to sort out the geometry and 8 weeks later the engine has been mounted correctly,


i weighed the box aluminium double cradle frame at the workshop:


its very light!


put it all together, and this is where we are at now:


i am hoping to get the engine running in the next few weeks, with lots of tuning and testing to follow for the speed trials in march next year. if anyone knows any good dyno testers that can help tune the ignition, let me know.

one thing is for sure, watch this space!
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125cc Salt Racer - God of Speed Thread
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Old 09-26-2011, 03:01 AM   #2
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Wow thats pretty impressive mate.Good luck !
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Old 09-26-2011, 03:57 AM   #3
Gordo7
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Good luck with this project mate. Nothing like having a nice cheap project to work on.
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Old 09-26-2011, 05:59 AM   #4
Brendan J
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Good to see it coming together Charlie !!! Try Clive Wolfenden at C&C M/cycle engineering in Thomastown has a dyno as specialises in race tuning.
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Old 09-26-2011, 06:11 AM   #5
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Quote:
Originally Posted by Brendan J View Post
Good to see it coming together Charlie !!! Try Clive Wolfenden at C&C M/cycle engineering in Thomastown has a dyno as specialises in race tuning.
cheers, its slowly but surely.

ive never had any dyno testing done before, what is the going rate to setup a good ignition curve? my cdi can hold a few so i was planning on setting one up with stock internals and another with all the good hardware bolted on
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125cc Salt Racer - God of Speed Thread
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Old 09-26-2011, 06:42 AM   #6
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Good to see it coming together Charlie !!! Try Clive Wolfenden at C&C M/cycle engineering in Thomastown has a dyno as specialises in race tuning.
T-Rex Racing, Rex and Clive Wolfenden, they run a bike for Robbie Phillis, Wayne Gardiner, even Ken Wootten guest rode for him, among others, awesome blokes. Very approachable bloke, Rex is supposed to be retired but works most days (7) he might be interested in something like this. If you drop by and show him what you are doing the worst is you'll probably get some damned good advice. And Rex would know most of the blokes who do this type of stuff. So I'd suggest he is a must visit for what you are doing, time well spent.

Rex Wolfenden Factory 3, 45 Kolora Road Heidelberg West ( tel 03 9457 5411).

beers,
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Old 09-27-2011, 02:07 AM   #7
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125cc Salt Racer - God of Speed Thread
'Overall happiness is directly proportional to the increasing distance between the front wheel and the ground.'
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Old 09-27-2011, 02:26 AM   #8
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Good luck with your project Charlie.

Ive got a little project in the shed but its not getting along anything like yours. Well done.
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Old 09-27-2011, 02:26 AM   #9
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Good stuff keep posting
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Old 09-27-2011, 04:28 AM   #10
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You're doing bloody well doing that whilst studying full-time.

I assume you're hoping for 170km/h +? From what I recall, that's what the RS125s top speed was.

Those little engines are rippers. I had a NSR150 and it would get to 100mph without a worry - I'm assuming your bike will stomp on that.

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Old 09-27-2011, 05:01 AM   #11
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You're doing bloody well doing that whilst studying full-time.

I assume you're hoping for 170km/h +? From what I recall, that's what the RS125s top speed was.

Those little engines are rippers. I had a NSR150 and it would get to 100mph without a worry - I'm assuming your bike will stomp on that.

yeah, the australian record is 160kmh and world record is 215 kmh for the non faired class and 198 and 225 for the faired class. remember the salt will take a good 25ks off the top speed.

i feel those speed are within reach for me except maybe the 225kmh one!
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125cc Salt Racer - God of Speed Thread
'Overall happiness is directly proportional to the increasing distance between the front wheel and the ground.'
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Old 09-28-2011, 01:49 AM   #12
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some nice streamliner fairings that weve got!



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125cc Salt Racer - God of Speed Thread
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Old 09-29-2011, 04:05 PM   #13
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some nice streamliner fairings that weve got!




"We have great traction at the back wheel, why don't we put the handlebars back there?"
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Old 09-29-2011, 04:40 PM   #14
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Good stuff keep posting
Yup
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Old 09-29-2011, 06:47 PM   #15
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This is the shizzle.
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