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Apr 17, 2011 | 07:32 PM

#11

qtrracer

Ultimate HDF Member

Joined: Jan 2008

Posts: 6,532

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From: SoCal

How many oversize can you go on 107?

Apr 17, 2011 | 07:39 PM

#12

Seasoned HDF Member

Joined: Jan 2006

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From: Charleston, SC

Fuelmoto's 107 kit is only like 1299. That includes the TW555 cams.
So it's probably 3-400 bucks cheaper without since you already have them. I would give them a try.

lp

Apr 18, 2011 | 12:04 AM

#13

getty30188

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Joined: Feb 2010

Posts: 104

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From: Woodstock Ga

Fuel Moto has all you need for the project. They also have a full machine shop.

Apr 18, 2011 | 11:49 AM

#14

HDThunder

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Joined: Feb 2010

Posts: 190

Likes: 2

From: Central MA

Quote:

Originally Posted by Sallyman

well I have Woods tw-555's. pushrods from Fuelmoto, PCV w/map from Fuelmoto, all I really have left to buy is pistons other than getting cylinders bored locally. Any recommendations on pistons? I'm thinking 10:2:1 or 10:5:1..

Don't be misled into thinking a 10.5:1 piston is going to give you 10.5:1 for your final compression ratio. You need to plug all the numbers into a calculator like the one on Big Boyz Head Porting to determine that. It depends on a number of factors - deck height, head gasket thickness, head chamber volume and piston type (flat top, dome, dish).

I'm at 10:3:1 with 10.5:1 flat top pistons in my 107" motor and that's with .031" of squish and 85.5cc combustion chambers. If you don't set deck height, cc the chambers and run an appropriate head gasket like a .030" MLS you could easily end up under 10:1 with a 10.5:1 flat top piston. If you go with the Fuel Moto kit you should be right around 10.25:1 per Jamie.

Apr 18, 2011 | 06:07 PM

#15

Sallyman

Thread Starter

Road Captain

Joined: Apr 2010

Posts: 513

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From: Charlottetown, Prince Edward Island

I have another qustion about OEM jugs, I hear rumblings that the walls are too thin when bored out to this size??

Apr 18, 2011 | 06:34 PM

#16

HDThunder

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Joined: Feb 2010

Posts: 190

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From: Central MA

Quote:

Originally Posted by Sallyman

I have another qustion about OEM jugs, I hear rumblings that the walls are too thin when bored out to this size??

Regardless of any "rumblings" you might hear there is nothing to worry about. There are probably thousands of 107" builds running around with no issues at all. The only area that is thin is the spigot at the bottom of the jug and there is really no stress in that area.

Apr 18, 2011 | 06:43 PM

#17

HDThunder

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Joined: Feb 2010

Posts: 190

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From: Central MA

xxxxx

Last edited by HDThunder; Apr 18, 2011 at 06:46 PM. Reason: Double Post...

Apr 18, 2011 | 07:25 PM

#18

qtrracer

Ultimate HDF Member

Joined: Jan 2008

Posts: 6,532

Likes: 132

From: SoCal

Quote:

Originally Posted by HDThunder

And all those thousands of 107's will be looking for new cylinders when they need an overbore(cause they can't be bored), or will they accept an overbore? Still no answer.

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Apr 18, 2011 | 07:38 PM

#19

Egldr05

Road Warrior

Joined: Jan 2007

Posts: 1,415

Likes: 18

From: Belmont, MI

Quote:

Originally Posted by qtrracer

And all those thousands of 107's will be looking for new cylinders when they need an overbore(cause they can't be bored), or will they accept an overbore? Still no answer.

Who really cares if they can be over bored (they can't). You can pick up used cylinders all day long for $50-$75. How often will you need them?

Rick

Apr 18, 2011 | 08:02 PM

#20

jrhd1

Cruiser

Joined: Aug 2008

Posts: 161

Likes: 0

From: Cincinnati, Ohio

Stick with matching components from one builder who has put hundreds of these builds on the street. Also, u pretty much get what you pay for and numbers don't lie.....

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