120" kit from HD!
Road Master
Joined: Jan 2007
Posts: 1,221
Likes: 2
From:
I can't believe with that kind of hp/tq that the regular drive belt would hold up. Usually when you get that kind of performance a lot of guys go back to the chain final drive. I'd love to have those kinds of numbers, but I just can't believe that the rest of the drivetrain would hold-up for very long with it.
Elite HDF Member
Joined: Apr 2009
Posts: 4,082
Likes: 11
From: Long Island, NY
I've got a 117" built by Rosa's Cycles. We went with a chain drive since the belt would not stand up to the torque.
Bike has awesome power and a great dyno chart with no real dips in power. I've attached a copy.
Bike has awesome power and a great dyno chart with no real dips in power. I've attached a copy.
Road Master
Joined: Jan 2007
Posts: 1,221
Likes: 2
From:
Impressive build! I don't understand how the belt won't stand up to the torque though...these builds I spoke of all exceed the amount of torque your makin & not one of the three belts have ever had an issue & they beat the sh** out of em! Chain is obviously a good move, but I don't feel entirely neccessary!
Outstanding HDF Member
Joined: Nov 2006
Posts: 2,049
Likes: 6
From: Oregon City, OR
Was thinking about throwing the stage IV on my SG when my winter lay-off is over. After seeing this kit, I may head in different direction. Of course that may require waiting until next winter.
Road Warrior
Joined: Jun 2009
Posts: 1,333
Likes: 3
From: Jefferson, Oregon
Impressive build! I don't understand how the belt won't stand up to the torque though...these builds I spoke of all exceed the amount of torque your makin & not one of the three belts have ever had an issue & they beat the sh** out of em! Chain is obviously a good move, but I don't feel entirely neccessary!
I have read that many times...once you reach that 100/100 number, you risk the belts. I...personally think this is riding style. Maybe MUD can elaborate...but a clutch dump from a stand still is the hardest thing on a drive system. Drag racing, street racing....
but regular riding without dumping the clutch might help? Maybe I'm wrong...but I was limiting myself at those numbers due to reading that so much and not wanting a chain on this bike..what-so-ever!
Road Master
Joined: Jan 2007
Posts: 1,221
Likes: 2
From:
I have read that many times...once you reach that 100/100 number, you risk the belts. I...personally think this is riding style. Maybe MUD can elaborate...but a clutch dump from a stand still is the hardest thing on a drive system. Drag racing, street racing....
but regular riding without dumping the clutch might help? Maybe I'm wrong...but I was limiting myself at those numbers due to reading that so much and not wanting a chain on this bike..what-so-ever!
but regular riding without dumping the clutch might help? Maybe I'm wrong...but I was limiting myself at those numbers due to reading that so much and not wanting a chain on this bike..what-so-ever!
Road Warrior
Joined: Jun 2009
Posts: 1,333
Likes: 3
From: Jefferson, Oregon
Well...I will take your word for it!
That is IMPRESSIVE! to say the least. I can't imagine that kind of power out of my Bob..........
Well..I guess if I go insane on my bike I will find out. Thanks for the input.
That is IMPRESSIVE! to say the least. I can't imagine that kind of power out of my Bob..........
Well..I guess if I go insane on my bike I will find out. Thanks for the input.
Cruiser
Joined: Jan 2010
Posts: 118
Likes: 0
From: albuquerque , new mexico
longevity
i dont own one but once u get that big i am sure it wont last aslong as a stock 88 or 96 ...how many big motors u see going even 30k miles ? i know the big dogs and the iron horses dont cuz i know quite a few who owned them and sold them due to always in the shop for starters or other issues 
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Road Master
Joined: Jan 2007
Posts: 1,221
Likes: 2
From:
i dont own one but once u get that big i am sure it wont last aslong as a stock 88 or 96 ...how many big motors u see going even 30k miles ? i know the big dogs and the iron horses dont cuz i know quite a few who owned them and sold them due to always in the shop for starters or other issues
I am producing over 120 rear wheel horsepower and the only problem that I have had with mine was dumping the clutch from a dead stop and tire did not spin, instead went into the hop, this broke the drive belt. I have lite up the tire with no problems, but I prefer to launch at about 2500-3000 rpm, not spinning the tire and then go full throttle.