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Old 08-20-2015, 07:57 PM   #281
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My scooter weighs 185 pounds.

My plan is to have both a scooter, and a smaller 2 stroke dirt bike on swing down carriers on the back of the bus. There will be one on each side of the rear door, in a upright position, front tire pointed at the sky.

I don't do 4 strokes in the smaller stuff. I like the characteristics and simplicity of the 2 stroke.

An even lighter solution may be a home made electric bike. You tube has some impressive videos of home made electric bikes. Best part is once the power runs out, or needs a boost, you can still peddle. And the bike should be under 100 pounds VS the almost 200 for a scooter.

An electric bike is in my near future. If I didn't have the scooter, it would be in my immediate future.

Nat

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Old 08-20-2015, 09:21 PM   #282
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I prefer 2 strokes also, but the simple little 80's get around 100 mpg and I can cruise upright into the wind at 45+mph.
I want a Dio or Yamaha Jog though. the 2 strokes are much more fun to hot rod!
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Old 08-20-2015, 11:26 PM   #283
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"A normally aspirated, gasoline burning two-cycle engine will produce 40% more horsepower per cc than a normally aspirated, gasoline burning 4-cycle engine".

That was the official scientific finding by the FIM* research team charged with handicapping two-cycle formulae race bikes back in the late seventies after they won something like 15 consecutive world championships. They were eventually "ruled" out of the running since the 4 strokes still couldn't compete with them.

Ring-Ding's rule!

*Fédération Internationale de Motocyclisme
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Old 08-21-2015, 01:54 AM   #284
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When I was in high school, a couple buddies had Kawi triples and RD's. Crazy bikes in the day. RD stood for rapid death back then.
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Old 08-21-2015, 01:59 AM   #285
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That's good to know Tango.

I don't know about the USA, but here in Alberta Canada, 49cc and under are dirt cheap to insure, and only need a learners license to operate.

My scooter cost $85 a year to insure, and around $40 to register.

For anything over 49cc, you I need a motorcycle license, and insurance would be close to $100 a month.

I may add a big bore 80cc kit to mine. Then even with my dog along for the ride, I will be able to do 100kmh.

Nat
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Old 08-21-2015, 05:49 AM   #286
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That's good to know Tango.

I don't know about the USA, but here in Alberta Canada, 49cc and under are dirt cheap to insure, and only need a learners license to operate.

My scooter cost $85 a year to insure, and around $40 to register.

For anything over 49cc, you I need a motorcycle license, and insurance would be close to $100 a month.

I may add a big bore 80cc kit to mine. Then even with my dog along for the ride, I will be able to do 100kmh.

Nat
No insurance required here... For any two wheeler.
but if its under 50cc it requires no license.
$15 a year for the tag.
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Old 08-21-2015, 08:13 AM   #287
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I have honda jazz 50cc honda 70 passport, and a mint honda trail 90. but I look cooler on a gsxr1000. Also have classic 1980 cx 500 honda .
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Old 08-21-2015, 10:12 AM   #288
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The horsepower to weight ratio for racing two strokes is just insane. My highly modified RD350 (converted to run 1/2 a water-cooled TZ750 top end) weighed in wet at just over two hundred pounds) and dynoed out at 135+ rear wheel horsepower. I ran it up in class against 500, 750 and even the Open Class (up to 1200cc's) and it routinely smoked them. It's only real competition were genuine Factory F1 & F2 bikes. Little bike, big fun.

Yamaha was really savvy back then and built the mild mannered RD series in such a way that mod racers could transplant most of the factory formula racer parts onto them with very little effort. That brought a lot of privateers into fold and their brand dominated the scene for years.

"King Kenny" Rogers in action on a TZ750 was one of the most amazing sites I ever witnessed on two wheels.

Funny thing is...even with all the new, exotic technology...Formula GP lap times on just about all the major road courses around the world...are slower today than they were in the late seventies.

Old school two-strokes STILL rule.
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Old 08-21-2015, 10:37 AM   #289
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Kenny Roberts.

Cal Rayborn said the TZ750 was a deadly bike. For him it was

Even an "old" LCR Honda RC213v has 250hp and weighs 247 lb. Of course this is Moto GP class, impressive stuff all around!
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Old 08-21-2015, 10:53 AM   #290
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I recently got a '78 Yamaha DT400 (2-stroke 400cc enduro) back up and running.. Even that things scares the shite outta me!
I was riding it last year, but it had a serious exhaust restriction from where the previous owner hit something and crushed the exhaust nearly flat. After replacing the exhaust pipe I started it up, hopped on and gave it some gas. It bucked me off like a bronco and had me laying in the dirt! I was so used to driving it with that restriction and had no idea how much power it actually had..
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Old 08-21-2015, 11:06 AM   #291
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Simply put, they were...absolutely brutal machines. But for the few riders who figured them out, they were untouchable. Forget the factory rating of about 140 hp. I knew privateers who were getting well over 200 and a few AMA rule followers who were near the same.

Cal was a terrific rider and one of that few who could handle big power. But he didn't die on a Yamaha. He was killed Downunder riding a thrown together Suzuki.

Scary? Yes. The frame & tire technology were 20 years behind the engine. My only ride on a TZ750 was about a dozen laps at the old Texas World Speedway on a well prepared privateer's bike and I can testify to how remarkable they were. My little 373cc homebuilt would peak just above 180 near the end of the straight...the 750 would whip past 200 in a fraction of the track with and still be pulling hard. We radared it at 211 that day and it felt like I was no where near topping it out.

Beautifully brutal and definitely scary.
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Old 08-21-2015, 11:25 AM   #292
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I stand corrected re: Rayborn's death. Time does affect one's memories.
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Old 08-21-2015, 11:51 AM   #293
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Quote:
Originally Posted by Tango View Post
The horsepower to weight ratio for racing two strokes is just insane. My highly modified RD350 (converted to run 1/2 a water-cooled TZ750 top end) weighed in wet at just over two hundred pounds) and dynoed out at 135+ rear wheel horsepower. I ran it up in class against 500, 750 and even the Open Class (up to 1200cc's) and it routinely smoked them. It's only real competition were genuine Factory F1 & F2 bikes. Little bike, big fun.

Yamaha was really savvy back then and built the mild mannered RD series in such a way that mod racers could transplant most of the factory formula racer parts onto them with very little effort. That brought a lot of privateers into fold and their brand dominated the scene for years.

"King Kenny" Rogers in action on a TZ750 was one of the most amazing sites I ever witnessed on two wheels.

Funny thing is...even with all the new, exotic technology...Formula GP lap times on just about all the major road courses around the world...are slower today than they were in the late seventies.

Old school two-strokes STILL rule.
I've always wanted an RD or an RZ.
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Old 08-21-2015, 01:29 PM   #294
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tango, you was runnin alky? and castor? those were good times.
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Old 08-21-2015, 05:01 PM   #295
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I ran synthetic and aviation fuel or NASCAR gas. They were around 116-118 octane as I recall.

And ya...those were excellent times. The little club I raced with (TRRC, Texas Road Racing Club) was pretty competitive. A youngster we called Little Freddie Spencer at the time went on to win the World Championship and Doug Polen reigned in the Superbike class. Several others were picked as factory riders and did very well. Had a lot of fun and got to meet some amazing talent.

But the race I remember most was the 200 miler at Daytona back in '80 or '81 I believe. Kenny Roberts had his throttle stick wide open on his 750 coming into a fast left hand sweeper in the infield fifty feet from where I was standing. He wrestled it onto the grass, down on it's side, then up and back onto the track with the engine screaming and finished the lap with the throttle still stuck using just his kill switch. Turns out some dumb-ass AMA inspector had boogered up one carb while checking the restrictors those bikes had to run. It was one interesting ride.

Me...I would have pulled the eject lever as soon as I realized that monster wasn't wasn't gonna' play right.
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Old 08-23-2015, 07:18 AM   #296
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watched freddy flat tracking in shreveport la as a kid. he grew up, won the world title and bought a honda dealership. turned into a real azzhole, another kid in shreveport, danny devers, had a tz 250 that he would run on the streets! danny had the yamaha dealership. guess whom i bought from.
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Old 08-23-2015, 08:30 AM   #297
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Just because how rare it is that anyone outside my circle of friends knows about this animal-have a pic of the squirreliest bike of all time-the TZ750 flat tracker.


<--been racing bikes or bike powered cars for the last 35 years.
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Old 08-23-2015, 08:59 AM   #298
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My last big bike was one of these...


Maybe we should start a "vintage bikes" thread...
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Old 08-23-2015, 10:15 AM   #299
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Kenny's famous quote after winning the Indy mile on that totally insane TZ750 powered flat tracker...

"They don’t pay me enough to ride that thing."

But it was his dirt track skills that set him apart on the asphalt. He rode Formula bikes like no one ever had. Blow into a turn, lock the brakes a little early to break the tire loose...hang off the bike, then full on throttle to drift it all the way through the turns. A total departure from the smooth, sweeping lines everyone else had ridden for 60 years. The Euro racers (and everyone else) were blown away...literally. He totally changed the whole landscape and style of GP racing.

He was "King" Kenny for good reason.

Sorry to hear Freddy turned into schmuck. He was just a scrawny teenager at TWS, but an incredibly talented rider for his age.
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Old 08-24-2015, 07:24 AM   #300
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tango, yes he was talented. first time i ever saw a wheelie longer than a few feet ws at municipal auditorium in s'port. a kid on a honda xr70 wheelied the length of the parking lot, and back, without touching down. it was that little spencer kid!
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