Okay so I have this 06 SB that is a great ride but kinda slow compared to my 98 Sportster....No slamming any bike, the Sportster is far from stock.

So I am thinking a

Phat Performance Revolution 98" Big Bore Kit with either

Flat Top Pistons 9.75:1
Or Domed Pistons 10.5:1

Both using the stock heads, valves and what not

I was told that cams wouldn't make that big a difference but I am thinking

Andrews TW37B or Crane 310-2 and both appear to be middle of the road performance...Not to mild and not getting really wild.

Or there is the Screaming Eagle 95" kit that include things like the H/D Clutch Spring some gaskets and the SE A/C I don't need.

I have already done the Stage 1 remap, KN A/C and Rush Slip Ons.

What do you all think and thanks for any advice.

Karsten

 

Or...........Try a T-man stage 2 98 kit with .625 cams and hold on for dear life!

and Use the AIM lock up pressure plate with the OE spring

 

If you are thinking of Rev Performance.... then I would go with TMan on that. Get the heads ported and do the flat tops. Tman should be able to direct you were you want to be. WIth all the $hit on the Rev kits, it would pay in the long run to deal with a top flight guy like TMan.

WTF... whomever said cams aren't that big of a deal is steering you wrong. They are the HEART and SOUL of a build. Study up on cams. Fit the cam to your riding style and you will be very happy!!!!!

You have a TON of options for your build.... 95 and 98s. All kinds of 95 stuff floating around. 98s are really maxed out stock cylinders, like a 107 for 96 bikes. Besides buying a complete 'kit' you can send out your cylinders and have them bored and fitted with new pistons. Axtell, Hyperformance, and HQ comes to mind.

You can have Tman do head porting, or go to Bigboyz or Head Designs By Deweys and have a really nice set of heads.

PLEASE talk around some. The BEST builds are ones that are a complete 'system'. I have 54s with ported heads 107 and a Bosscat. SImple and straight forward. FUN FUN FUN. 117 TQ!!!!! Mix-n-match may NOT work out so well and a tried and true deal. HQ (headquarters) does nice complete 'systems'. AT least go look at them to get an idea of what is involved, ok?

You are on the right track... thinking NOW about what you wish to do. Then by say... August... you can have everything set in place and come early winter... be first in line with everybody like head porters, cylinder folks etc.

Done right? You WILL have a new bike.

 

You are correct, cams are no big deal. That is if you don't port the heads and use bigger valves. Your intake flow, cam timing and exhaust must work together. Even a mild TW21 cam works better with better flowing heads. The flow must equal the cam though. If you port too much a small cam will fall flat. You have a choice here. Go with a proven head design, cam combination or for less money just do 9:1 flat top Wiseco 95" pistons. Have Wiseco or reputable shop bore out your cylinders. It will be better than buying the SE kit. Put in a TW21 cam and go enjoy the torque.

 

Cams are a big deal. Select the wrong one and you can end up with a sluggish bike in the lower rpms or power that comes on like the flip of a light switch. Depending on the grind, they will determine where in the rpm range the power is. You also need to ensure that the compression ratio you decide on works well withthe cams you have chosen. Do an honest evaluation of your riding style and then select cams and other components based on that. Everything truly must work together to get the best out of any build.

Talk to some of the reputable builders on this site or others that have used particular combinations and done many builds. Checking with your buddy, or even someone on this site that has only done one build, and you will not get a true picture as they dont have any reference points, meaning most will say their bike runs so much stronger, but again, what do they compare it to?

 

give kirby at vee twin a call about their heads,a couple buddies and i have their stage 2 heads,awesome power
pat

 

thanks,we just finished around 40 hours of testing some new ideas on the flowbench,found some real nice improvments on the later TC heads

 

We offer our own 98" piston kit(with all Cometic gaskets) that Wiseco manufactures for us, and bore the OE cylinder.
That combined with our Stage III head, and as simple as a little Bob Wood 6 cam, and tuned correctly, you should be able to see 110/110.
The mentioned combo, is semi-similar to the build we are currently doing for American Iron Magazine.
Scott

 

Hmmm.... build sounds familair..........

 

Thanks for all the input, feedback and advise.

Anyhow opted to go the 95" route rather than the 98 after making a phone call about the 98" kit and which cam...Not good when calling a Speed Shop and they tell you they have no idea which cam will work best ad told me to call the manufacture....they were just retailers.

Figured I would find some take off jugs and send them out and checked out ebay...in hopes of finding something not all jacked up.

I come across one listing from a machine shop, claiming not to be a high volume ebay vendor, list the item as Re Manufactured, make mention of the machines and methods they use..Impressed, I think this place knows what they are doing.

The list price was fair, I have a choice of 2 piston/compression ratios and I won the Ebay deal later tonight.

Well this morning I call number listed on the Ebay listing by a company called VeeTwin something and ask if they have a Kirby....She say yes but he is out lollie gagging and having a great old time

Okay, so the truth be know they are closed on Mondays but Kirby will be back in the AM and I owe him money.

Now had I know about Scott with Hillside I might have been looking harder at the 98" kit they have to offer.

I figure while the bike is down I might as well have everything done at once so Cams are on the list and I have a line on a set of take off heads to send to someone for some work.

I don't know what a stock TC88 puts out but I would be happy with 90-100HP when it is all done.

This is gonna be a fun winter as there aren't many people around here doing much in the HP mods to their bikes.

Thanks again for the help and advice.

Karsten