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Old 10-31-2011, 12:12 AM   #31
GodSilla
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I'm still bothered by the steering angle. I don't know that any steering damper is going to compensate for the steepness of the forks. It will need to be set so stiff that it will introduce other problems. A good gust of sidewind could make life very interesting, to say the least. I've seen a bike blown clean off the course, an actual drag bike with the wide flat rear tyre, they won't turn/change direction, and the wind just shunts them sideways.

Methinks you will need to test it at the dragstrip before trying it on salt, if it goes wrong the bitumen surface is a lot less abrasive.
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Old 10-31-2011, 02:38 AM   #32
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if he puts the triple clamps on backwards he'll get more trail than he can shake a stick at, That should sort any stability problems just wont go round corners very well
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Old 10-31-2011, 06:08 AM   #33
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not sure either, but if need be during testing we can just slide the yokes up, or smaller rear wheel or lower rear ride height.

point is theres alot more to worry about before then. high speed tyres, full exhaust and radiator hoses to be made. mild tune of the carb at least so it runs.

in other news, the dash is looking good!


thats the starter on the left, and ignition on the right. simple.

the map 1-2 switch, lanyard and kill switch are on the bars.
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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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'85 XL600R-L-M-PDGSAZ
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Old 10-31-2011, 06:14 AM   #34
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http://ic1.maxabout.us/autos/tw_indi...a-9-yzf-r1.jpg

thats a pretty steep steering angle..........
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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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'85 XL600R-L-M-PDGSAZ
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Old 10-31-2011, 06:30 AM   #35
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Yea but whats its trail compared to yours?
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Old 11-01-2011, 01:54 AM   #36
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looking better every day


im starting to think if i spent more time actually working on it instead of lining it up for pictures, it would be done by now.............
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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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'85 XL600R-L-M-PDGSAZ
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Old 11-15-2011, 12:28 AM   #37
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Update???
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Old 11-15-2011, 12:32 AM   #38
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sorry guys,

electrics are done
first exhaust is done
seat is done
engine mounts are done
cooling system done

we turned the engine over for the first time today, and will be starting it tomorrow when i get some fluids.



i will need to make a tank that fits inside the frame, is 2-3 litres and lets me tuck my knees up aswell. until then we just have a small atv tank i got from work.
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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.'
-
'85 XL600R-L-M-PDGSAZ
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Old 11-18-2011, 07:06 AM   #39
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Quote:
Originally Posted by God of Speed View Post
what do you guys think of the length of the manifold we made?
Not sure about the inlet manifold length, but I would make a shorter one as well for Dyno testing. I'm not happy with the angle of the float bowl though.
Also a 40mm Carb may be too big for that motor ? On what basis did you choose it ?
A 40mm Flatslide will suport around 100hp. A 34mm would give you better air speed.
Getting closer though. Good luck with it.
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Old 11-18-2011, 08:45 AM   #40
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Originally Posted by Speedzter View Post
Not sure about the inlet manifold length, but I would make a shorter one as well for Dyno testing. I'm not happy with the angle of the float bowl though.
Also a 40mm Carb may be too big for that motor ? On what basis did you choose it ?
A 40mm Flatslide will suport around 100hp. A 34mm would give you better air speed.
Getting closer though. Good luck with it.
float bowl is at a better angle when the engine is in the frame, it is also from a cr250r so designed to operate on angles.

38mm is a standard upgrade from the 28mm carb, and some of the girls on the aprilia forum suggested to go even bigger than 40mm.

the manifold was tricky, as we needed to forge it to go from the round carb to the square reedblock, so im hoping it will be ok as making a new one will be a downright pain.
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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.'
-
'85 XL600R-L-M-PDGSAZ
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Old 11-18-2011, 04:26 PM   #41
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Yes, the round to square transition would be hard to make by hand.
The other thing to try that would be easy enough is a variable length intake bell mouth. Are you running the original expansion chamber ?
What sort of HP to weight ratio are you hoping for ?
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Old 11-19-2011, 01:27 AM   #42
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the original expansion chamber is a dog, already got a JM aftermarket pipe but for our specific high-revving and non-stock carb we will need a full custom one made up aswell.

looking for 40ish hp but just happy with 38 or so. for this year i am not going overboard on engine development, more chassis and aero.

but 40hp, on a bike that weighs 65kgs + 70kg rider = 300hp/tonne.
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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.'
-
'85 XL600R-L-M-PDGSAZ
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Old 11-19-2011, 01:29 AM   #43
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PS

i had originally planned to make a variable intake manifold but we already have so many parameters for tuning with the exhaust, fully programmable ignition and options for piston, head and cylinder, i didnt think it was necessary and just added alot of complexity for not much gain.
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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.'
-
'85 XL600R-L-M-PDGSAZ
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Old 11-19-2011, 01:48 AM   #44
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Love this project. Subscribed, and keen to see how this baby goes!
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Old 12-02-2011, 11:29 PM   #45
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here is a video of the first engine start

http://www.youtube.com/watch?v=Frb5YW5hT6Q
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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.'
-
'85 XL600R-L-M-PDGSAZ
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