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Author Topic: 1980 XS850 Brat (FINISHED!!!)  (Read 18185 times)

Offline hillsy

  • Posts: 4117
Re: 1980 XS850G Brat/Track/Scrambler
« Reply #40 on: Feb 19, 2014, 18:49:41 »
marc - have a look here:
 
http://en.wikipedia.org/wiki/Castrol_Six_Hour
 
The Castrol 6 hour was an institution in Oz and for many years it was literally "Win on Sunday, sell on Monday" for many bike dealers back in the day.
 
BMW won in 1977 and the XS1100 won in 1978. Both shafties. Both also had a few 2nd and 3rd places in other years.
 
Whilst on paper I agree that shaft drive bikes are not "race bikes", in the real world they are just as fast.

Offline o1marc

  • Posts: 2242
    • Creative Candy Powder Coating
Re: 1980 XS850G Brat/Track/Scrambler
« Reply #41 on: Feb 19, 2014, 19:11:36 »
marc - have a look here:
 
http://en.wikipedia.org/wiki/Castrol_Six_Hour
 
The Castrol 6 hour was an institution in Oz and for many years it was literally "Win on Sunday, sell on Monday" for many bike dealers back in the day.
 
BMW won in 1977 and the XS1100 won in 1978. Both shafties. Both also had a few 2nd and 3rd places in other years.
 
Whilst on paper I agree that shaft drive bikes are not "race bikes", in the real world they are just as fast.
That's 2 out of 17 years, and not in the last 36 years, not an impressive enough win ratio for me to run out and buy a shaftie.
I have always found shaft bikes to ride completely differently than chain drive.
« Last Edit: Feb 19, 2014, 19:13:32 by o1marc »

Offline hillsy

  • Posts: 4117
Re: 1980 XS850G Brat/Track/Scrambler
« Reply #42 on: Feb 19, 2014, 19:18:01 »
That's 2 out of 17 years, and not in the last 36 years, not an impressive enough win ratio for me to run out and buy a shaftie.
I have always found shaft bikes to ride completely differently than chain drive.

And the CB750 only won once and no Harley ever won. What's your point?
 
I have ridden a stack of shaft drive bikes over the years. I would say the Yamaha's are actually the least "noticeable" from a feel perspective out of the Big 4. BMW Boxers are a bit weird IMO (I mean the shaft feel....)

Offline o1marc

  • Posts: 2242
    • Creative Candy Powder Coating
Re: 1980 XS850G Brat/Track/Scrambler
« Reply #43 on: Feb 19, 2014, 19:25:30 »

And the CB750 only won once and no Harley ever won. What's your point?
 
I have ridden a stack of shaft drive bikes over the years. I would say the Yamaha's are actually the least "noticeable" from a feel perspective out of the Big 4. BMW Boxers are a bit weird IMO (I mean the shaft feel....)
My point was I was only making observations and expressing my opinion of my experience with shaft drive bikes and the want to convert to a chain. I personally would probably shy away from the shaft drive bikes if I was wanting to build a race bike, which is why I probably have favored the XS650 or TX750 instead of the larger XS models. I'm certainly not trying to convince anyone else to avoid shafties.

Offline ManxieRacer

  • Posts: 210
    • RSK Photography
Re: 1980 XS850G Brat/Track/Scrambler
« Reply #44 on: Feb 20, 2014, 00:50:49 »
Of course shafties are an illogical choice for a race bike; the shaft is both heavier and slower than it's chain counterpart, not to mention harder to play with ratio's to improve acceleration for a particular track meeting. If I recall ~20% of the engine's power is lost through the shaft/final drive alone...that's obviously not ideal for a race bike.

Not to say it can't, or shouldn't be done. But it's certainly harder.
« Last Edit: Feb 20, 2014, 00:53:30 by ManxieRacer »

Offline HollywoodMX

  • Posts: 774
Re: Re: 1980 XS850G Brat/Track/Scrambler
« Reply #45 on: Feb 20, 2014, 03:35:13 »
Of course shafties are an illogical choice for a race bike; the shaft is both heavier and slower than it's chain counterpart, not to mention harder to play with ratio's to improve acceleration for a particular track meeting. If I recall ~20% of the engine's power is lost through the shaft/final drive alone...that's obviously not ideal for a race bike.

Not to say it can't, or shouldn't be done. But it's certainly harder.

Agreed and it's 20+% drive train loss and chains are around is 7 to 9.

So to someones early point on why spend the money converting to chain, depending on the cost and your bikes power output converting to chain might give you more power that a set of fcr carbs.

But I think the 2 most important reasons of converting Shaft to chain would be for ease of gear changes based in your specific build needs and the opportunity to swap out to pretty much any chain wheel you want.

I had an xs 750. I didn't feel it jacking. But I did feel the Shaft neutered the bike a bit.

Now the flip side.  After building and maintaing a lot of bikes at once I get tired of dealing with chains and sprockets, because I tend to buy the higher end shit for longer lasting, less stretching and less weight so I feel like I'm always sinking in 300+ bucks in chain and sprockets for builds hoping I get the ratios right, especially the rear.
TR1 Build thread: http://www.dotheton.com/forum/index.php?topic=54733.0
Xv920 Tracker thread: http://www.dotheton.com/forum/index.php?topic=59754.15

77 KZ1075 Supercharged - 81 Yamaha XV920rh (x2) - 06 YZ250 highly modified - 08 Hyabusa

"I live my life a 1/4 beer at a time"

Offline Shug

  • Posts: 30
  • Mighty Manchester
Re: 1980 XS850G Brat/Track/Scrambler
« Reply #46 on: Feb 20, 2014, 05:15:01 »
The BIKE is looking good mate.
A gut full of ale and a head full of magic.


Offline treitz

  • Posts: 1286
Re: 1980 XS850G Brat/Track/Scrambler
« Reply #47 on: Feb 20, 2014, 12:15:07 »
The BIKE is looking good mate.

Haha thanks. Suddenly my thread is 2 pages longer due to a shaft drive vs. chain drive argument :)

I personally have never ridden a shaft drive bike. So maybe once I get this one going and ride it a few times I'll be able to weigh in.

Offline ApriliaBill

  • Posts: 844
  • Yeah...I'm old school.
Re: 1980 XS850G Brat/Track/Scrambler
« Reply #48 on: Feb 20, 2014, 13:46:53 »
Haha thanks. Suddenly my thread is 2 pages longer due to a shaft drive vs. chain drive argument :)

I personally have never ridden a shaft drive bike. So maybe once I get this one going and ride it a few times I'll be able to weigh in.

These bikes are usually such a good deal, I've literally owned over a dozen of them and talked many of my friends into buying them. Don't get me wrong, they are not Ducati's or Aprilia's, but when you think back to what was available in that time frame, it becomes clear these were really good bikes. For the time, they were very fast, the tree cylinders gave you the grunt of a twin and the top end of a four, They made glorious sounds when close to red line, the torque is impressive. These were some very under rated bikes for the time. Built like tanks. There is a reason the triple community is huge on both sides of the pond. I don't think I've run into a person yet, who didn't talk fondly of the Yamaha triple they owned. I think you'll be pleasantly surprised....
"Do not neglect to show hospitality to strangers, for by this some have entertained angels without knowing it."

Offline treitz

  • Posts: 1286
Re: 1980 XS850G Brat/Track/Scrambler
« Reply #49 on: Feb 20, 2014, 14:24:53 »
These bikes are usually such a good deal, I've literally owned over a dozen of them and talked many of my friends into buying them. Don't get me wrong, they are not Ducati's or Aprilia's, but when you think back to what was available in that time frame, it becomes clear these were really good bikes. For the time, they were very fast, the tree cylinders gave you the grunt of a twin and the top end of a four, They made glorious sounds when close to red line, the torque is impressive. These were some very under rated bikes for the time. Built like tanks. There is a reason the triple community is huge on both sides of the pond. I don't think I've run into a person yet, who didn't talk fondly of the Yamaha triple they owned. I think you'll be pleasantly surprised....

I've heard nothing but good things about them. I wish I was keeping it, but this will be on it's way to Texas to live with my brother in May. The good news is that I'll have a few months to brake it in for him. Assuming I get it finished and running soon of course. :)

For myself I'd REALLY like a 79 XS750. If I found one locally I would have no choice but to buy it and keep it for myself.