cam help
Grand HDF Member
Joined: Mar 2008
Posts: 4,996
Likes: 655
From: bklyn,ny
evo industries 49 tooth clutch basket would help
Last edited by bklynbob; Feb 28, 2015 at 05:46 PM.
Road Warrior
Joined: Jun 2008
Posts: 1,437
Likes: 80
From: currently an Okie
107
Watching that thread as well. Looks like a great upgrade to a 96"er. Increasing your engine displacement by 10% sounds good. Increasing displacement by 3%. Just doesn't seems like a big enough jump to justify???? Is it?
Cam and supporting mods = what? Cost?
107" and supporting mods = what? Cost $2g +/-
Is it worth it? I am asking? Honestly dont know the answer. Looking here to find answers.......
Cam and supporting mods = what? Cost?
107" and supporting mods = what? Cost $2g +/-
Is it worth it? I am asking? Honestly dont know the answer. Looking here to find answers.......
If that doesn't turn your crank, just buy a S&S 124 crate motor. You will have about $7500 in it, but it will be a once and done deal.
OR you can go for the S&S 143, or you could turbo charge a 143..OR.....
Stellar HDF Member
Joined: Jun 2007
Posts: 2,928
Likes: 117
From: Ashby, Ma
Nice thing is you don't need to go with new heads and there is no need for bottom end work. Prices are very reasonable as it is a core exhange. I got the numbers above with the Level B heads which up the price a bit.
Check them out. You can buy the package and do the install yourself, with the help of their 12 Video to walks you through it, or you can have them do it. You won't get better support than Fuel Moto.
http://www.fuelmotousa.com/107-inch-big-bore.html
Thread Starter
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Road Warrior
Joined: Jun 2014
Posts: 1,297
Likes: 57
From: N. IL
Oldhippie.....
All looks good, and considering same.
For me, going from 103" to 107" has very little to do with power increase, in my situation. I believe the higher compression is more at play.
All looks good, and considering same.
For me, going from 103" to 107" has very little to do with power increase, in my situation. I believe the higher compression is more at play.
Ultimate HDF Member
Joined: Mar 2012
Posts: 6,129
Likes: 143
From: Santa Cruz
No need for 107. Them 4 cubes aren't a big deal. Your stock heads can be flowed and milled for compression for the cost of bore and Pistons. With proper exhaust, cams and tune will run with most 107s. Lots of good head guys that can point ya to a good combo. But if ya just want to cam your 103 I'm a fan of 57s.
Stellar HDF Member
Joined: Dec 2009
Posts: 2,561
Likes: 280
From: North Cental Iowa
If you're already thinking a stage 2 won't be enough, it most likely isn't going to satisfy you. Your most cost effective route is to find a good builder who can either port the heads himself or knows someone that can. 107 kits are not magic, the reason they work so well is because everything is set to work together, mostly being compression ratio. Frank Dragos @ Dragos Bikeworks can give you some good advice & ideas on the direction to go, his shop is in Machesney Park IL. There are many others in the upper Midwest also that can do a good job, just thought he might be the closest to you. If you can do the work yourself a bolt on 107 kit isn't a bad idea because all of the details are already figured out for you, such as piston deck height & head chamber volume to set the optimum CR for the cams you choose for your particular riding style. You are correct in thinking that a properly set-up 103 will only be 3-4 less HP & TQ than a 107, that was the reason I asked how many miles were on the bike. You should easily be able to get 105-110 HP & 115-120 TQ out of a 103 with good head work & proper cams. Ask for dyno runs for the package you are advised to because all the best parts in the world are no good if the combination doesn't work well together, good luck in your build.
Last edited by DTTJGlide; Mar 1, 2015 at 02:46 AM.
Thread Starter
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Road Warrior
Joined: Jun 2014
Posts: 1,297
Likes: 57
From: N. IL
Ok guys.......I think I'm on the right path.
Ported cylinder head milled for compression.
Cam to work with new head
Programmer
Do clutch springs need to be changed? Also can I remove cat from factory head pipe and achieve decent results.
Seems like stepping up to a pipe with crossover would be something that be be more necessary when squeezing h/p or larger cubes?
Ported cylinder head milled for compression.
Cam to work with new head
Programmer
Do clutch springs need to be changed? Also can I remove cat from factory head pipe and achieve decent results.
Seems like stepping up to a pipe with crossover would be something that be be more necessary when squeezing h/p or larger cubes?
Seasoned HDF Member
Joined: Oct 2007
Posts: 56,052
Likes: 88,324
From: Western South Dakota
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