124" winter build...

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Dec 18, 2014 | 11:33 PM

#71

monster715

Thread Starter

Road Warrior

Joined: May 2010

Posts: 1,718

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From: Bay area, CA

Quote:

Originally Posted by HD Pilot

No, it is an additive change - going smaller on the front pulley is the same as going big on the rear pulley except 1 tooth on the front = 2 teeth on the back(approximately). You are compressing your gears by both of the mods, so you will shift at lower speeds but your acceleration to these speeds will be quicker. Top speed will be reduced, so if you heart is set on cruising at 80+ mph, ypu might want to reconsider.

Well ****.. I haven't messed with sprocket changes since bmx days and I guess I remembered backwards... I'm going to stick with the 30t for now. The 70t rear won't be here in time to PC with this batch so maybe I'll stick with the 66t rear for break in and see how it feels. Could still try the 70t later and switch it back if I don't like it. She might wheelie with no clutch lol. Learn something everyday haha

Dec 19, 2014 | 11:12 AM

#72

mattVA

Stellar HDF Member

Joined: May 2009

Posts: 2,066

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From: Northern VA

I did the 30T first, bought a 70T rear and never put it on. I just like the 30/66 too much to mess with it. What I liked most about the change is it revs faster. I think more of the engine torque makes it to the rear wheel as well when I was reading up on gearing formulas.

Dec 19, 2014 | 04:38 PM

#73

C.H.L.

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Joined: Feb 2010

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From: Houston, TX

I love this thread :-)

I'm working on a 117" build now.

As of right now, Wolfgang Grasser in Baytown, TX has done a set of heads for me.

Now I'm saving for a S&S 117 kit (new crankshaft, 117 cylinders & Pistons)...

Probably gonna keep my 777 cam, (but might go with a hi lift cam)...
And probably stick with stock throttle body (have Wolfgang Polish it a bit)....

Until I get parts, and have him assemble it - I'm living through your thread :-)

Dec 19, 2014 | 04:45 PM

#74

HD Bobber

Grand HDF Member

Joined: Sep 2010

Posts: 3,580

Likes: 215

From: Illinois

Quote:

Originally Posted by mattVA

If you like you 30/66 you don't know what you are missing with the 30/70.....you will like it that much more.

Dec 19, 2014 | 04:54 PM

#75

monster715

Thread Starter

Road Warrior

Joined: May 2010

Posts: 1,718

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From: Bay area, CA

Quote:

Originally Posted by C.H.L.

If your going with the s&s crankshaft why not go 124"? Same price.. Don't get me wrong I'm not knocking your build at all. Just curious why? I was going to do the same thing, mainly because the 124" number kinda makes me nervous haha. I tried to let Kirby talk me into a 117" but in the end it's the same price for either crank. I'm going to be looking for your thread also where are you going to post it?

Dec 19, 2014 | 05:09 PM

#76

C.H.L.

Road Warrior

Joined: Feb 2010

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From: Houston, TX

Quote:

Originally Posted by monster715

A lot later than I wish haha

Probably gonna be a year or more before I save up for parts and labor.

Dependability was why 117. NOT saying the 124 isn't, but Wolfgang said the stroke of the 117 was a tried and proven stroke. I didn't talk to him much about it to be honest. He suggested it over the 117 for long rides, and I said let's do it.

I also think I'll be plenty happy with the power. I'm ALMOST happy with my stock 103 with a 777 cam. I should be plenty happy with a 117 and head work.

But it'll be 6 months+ before I order parts. You have plenty of time to talk me into 124 haha

Dec 19, 2014 | 05:13 PM

#77

monster715

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Road Warrior

Joined: May 2010

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From: Bay area, CA

Quote:

Originally Posted by C.H.L.

Haha no way man I don't know enough about it yet to start talking people into or out of anything. I asked Kirby about the longer stroke also but he said that you don't even start having issues til you get up to 4-3/4" stroke. But yea man I think you'll be plenty happy with the 117". Id say trust your motor guy and go with what he recommends. That's what I did

Dec 20, 2014 | 09:38 PM

#78

dirtdobber

Elite HDF Member

Joined: Jul 2007

Posts: 4,749

Likes: 16

From: sand mountain Alabama

Quote:

Originally Posted by mattVA

That is why I went with 113. If built right they will rev like a crotch rocket and when you hit it hits real quick in any gear.
i have around what you are looking at, 124hp/148tq.
I eat rear tires, 2 to 3 sets a year. What I like is cruising at 60mph and all you have to do to pass is roll on some throttle. want to pass real fast gear down to 5th, if that isn't fast enough go to 4th and hold on.

Personally I think you will have better times @ the strip with the factory gearing.

You will have all the low end you want, and then some.