Fuel Moto 107" or S&S 106"?

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Nov 20, 2010 | 11:54 PM

#11

Mike

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Joined: Jun 2009

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From: Centralia, Wa

James, why are you second guessing yourself?

You know you want it.

Nov 21, 2010 | 02:03 AM

#12

Garcou

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Joined: Mar 2010

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From: Arlington, Washington

Go for it James, at least with FM's kit your going to get excellent service, also are you really going to ride your bike that hard? I mean come on if your full throttle everywhere you go then yeah you probably need to think about getting into the bottom end. Just hammering the throttle to put a smile in your face or to pass a car is not going to hurt that build in the least bit

Nov 21, 2010 | 03:38 AM

#13

leohd

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I heard the same thing that boring out stock cylinders to 107 is not wise and will not give you long term dependability, leaves the walls way to thin.

Nov 21, 2010 | 06:50 AM

#14

sporacer

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Joined: May 2008

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From: connecticut

Quote:

Originally Posted by 1931jamesw

This is the question swimming around in my head. I was talking to a friend today about Jamie's 107" kit and I was pretty much sold on it. My friend said he would be afraid that the cylinders wouldn't hold because that much bore makes them too thin. He said he thought he would go with the S&S. So, I came home and looked at the S&S webpage and sure enough, S&S cylinders are made with a different material and they do not even want the stock cylinders as a core. Their 106" cylinders, as I said, are made with a different material, which they also say is "much stronger" and that even with their stronger cylinders, that is as big as they feel safe boring. I thought I was sold on Jamie's 107" but after talking and reading more, Im questioning everything again. I like the Wood cams torque curve very much though. Here's why, I drew the dyno sheet on Jamie's website over the top of my dyno sheet with the 255 cams and the curves are essentially in the same place as far as left to right. The difference is they are higher up (more power). What Im saying is the power is in the same rpm band, there is just more of it. Now I dont know what the hell I'm gonna do. I'd be sick if I scissored my crank or grenaded my motor. Now Im wondering how the Wood tw555 cams would work with the stronger S&S jugs?

I be willing to bet that you will end up very close with the 106 or 107 power. I would not bore stock cylinders out to a 106 0r 107 due to the cheapness of the S&S cylinder kits. I was told early on that there was not enough material to use the stock cylinders. The bore size for a 106 is 3.927 compaired to 3.938 for the 107. Lets face it your *** will never know the differance in 1-2 hp and torque.
It seems like alot of builders are boring stock cylinders to 107 but they are all trying to compete for your business. I will be boring my S&S cyliders to 107 and C&C porting the cylinder heads Soon.

Nov 21, 2010 | 07:44 AM

#15

lkr0

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Joined: Nov 2006

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From: Stockbridge, GA (Atlanta)

15,898 miles on a HQs 107 bored stock cylinders--09 RG not one problem -- 08 RG HQs 107 5k miles (totalled from 5mph drop bent tab) not one problem -- both bikes putting out excess of 120 tq--if the Fuel Moto kit was out when I did these builds I would have got it. I have not heard that many crank horror stories--check the run-out if close to being out of spec--I would get the timken and and possibly welded just for insurance. If you do this you are getting close to 120r crate motor (selling the 96).

S&S makes great products they haven't been in business this long by making junk--get what you are comfortable with.

Nov 21, 2010 | 08:02 AM

#16

JollyRogers

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Joined: Jul 2006

Posts: 928

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From: Near Richmond VA.

Read the review of S&S kit on Dennis Kirk. Think I would go with Jamie, just for the customer service...

Nov 21, 2010 | 08:23 AM

#17

troop

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Joined: Oct 2009

Posts: 2,870

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From: Stoughton, WI

Does Fuel Moto bore the cylinders to specific pistons or just do a "generic" bore to match the 107" piston? S&S is similar to SE where they do a generic piston/cylinder bore and in some occasions I've read of loose tolerances. Is this a big problem/issue? I've seen the S&S kits for as cheap as $575. Sell your stock cylinders for $100-125 and you're down to under $500 with the comfort of having thicker cylinder walls. I've also read about S&S cylinder thickness somewhere but can't remember the +/- so do a search on that. I only live about 100 mi from FM but also have a bro-in-law who is a Drag dealer so I'd get a good price on the 106" set up. Tough call to make....

Nov 22, 2010 | 11:44 AM

#18

fuelmoto

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From: Little Chute, WI

Fuel Moto is in no way the pioneer of the 107" bore on stock cylinders, it has been done many, many times by several other top engine builders/suppliers. However over the years there has been discusions, rumor mill and gossip concerning the sleeve thickness and failures, but rather than actual supportive data it has been simply claims. Much of this has been fueled by the competition, we have seen as little as .011 difference in sleeve thickness between a bored OEM cylinder and a supposedly "much stronger" cylinder. S&S has even changed their marketing strategy from stating the lack of sleeve thickness when using bored OEM cylinder to their cyl, instead they now market the sleeve material strength of their kit, I guess someone measured the actual difference in liner thickness.

I have not dyno tested the S&S 106" kit and they do build a very nice product, however comparing the S&S 106 kit to the Fuel Moto 107 kit is really an apples to oranges comparison as the S&S is a cylinder/piston/head gasket kit, while our 107" kit is a complete combination of components we have developed to work together which includes forged 107" pistons, bored OEM cylinders, Wood TW-555 cams, Wood Directional lifters, Fuel Moto adjustable pushrods, Torrington inner cam bearings, and all necessary gaskets and orings.

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