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Author Topic: Motorcycle Question  (Read 1996 times)

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RMBillings

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Motorcycle Question
« on: December 19, 2006, 08:41:52 PM »
I would like to build a bike to run for a speed record.  I have a Yamaha YSR that has a 50 CC motor in it.  I would like to replace the 50 cc with a performance 250cc motor.  Can I replace the stock motor or do I have to modify the 50 cc?  Would I be running in the 'M' modified Frame and 'G' modified engine gasoline class?
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Offline Nortonist 592

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Re: Motorcycle Question
« Reply #1 on: December 19, 2006, 09:25:28 PM »
If the 250 motor you plan to install is a Yamaha then you will run in Modified.  If the motor is say, a Honda, then you are in A (special construction).
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Get off the stove Grandad.  You're too old to be riding the range.

Offline Dean Los Angeles

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Re: Motorcycle Question
« Reply #2 on: December 20, 2006, 12:13:28 AM »
Oh, let's not play with the small stuff! This is what you really want!

Oh, yeah, if you run the fairing on gas it would be MPS-G 250 156.511 mph, without the fairing it would be M-G 250 137.169 mph. If it isn't a Yamaha engine, APS-G 250 155.729 mph or A-G 250 142.824 mph. All are Bonneville records. You didn't mention where you wanted to run.
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Well, it used to be Los Angeles . . . 50 miles north of Fresno now.
Just remember . . . It isn't life or death.
It's bigger than life or death! It's RACING.

Offline Freud

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Re: Motorcycle Question
« Reply #3 on: December 20, 2006, 12:18:19 AM »
Do you have legal rubber? I doubt that that bike could keep up with the pit crew races at the Moto GP circuit.

FREUD
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Offline Dean Los Angeles

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Re: Motorcycle Question
« Reply #4 on: December 20, 2006, 01:17:13 AM »
Good point. To qualify as a motorcycle you have to have 15" minimum wheels. The YSR has 12" wheels.
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Well, it used to be Los Angeles . . . 50 miles north of Fresno now.
Just remember . . . It isn't life or death.
It's bigger than life or death! It's RACING.
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