For cams you might want to look at Woods #5 or 6H - the .590 lift. I am running the 6H + 4 deg. in a 03 RK 95 cu in +.020, 208 ccp (that's a little excessive) with head work, It pulls good off the bottom hits strong at 28 -2900 rpm to 5000 + depending on what gear I'm in. Sometimes the tire slips at 4K . I have a VPC lock up in the clutch so I think it's the tire not the clutch. Eastcoast Jim

 

I have also run the #5 in a similar set up. it pulls good just has a little less stuff & signs off earlier. It will fry a Dunlop Eastcoast Jim

 

If you ride aggressively you will be disappointed. These sign off early and combined with your choked heads it will not be a happy combo.
Get the heads done they are a serious (10-12hp in a 98") bottleneck.
If you are doing headwork later you then run into a compression shortage with any performance cam that will get you in a better place unless you mill the heads a little or use a small dome. All easily done and a proper plan will get you where you want to be. A proper tune and pipe are critical.

 

You should listen to Don here... the heads won't flow what the engine needs and the cams are designed to. All the oem twin cams heads have tiny ports and valves,, and are the bottleneck in a majority of builds... most everyone is looking for a quick bolt on solution, they want to buy a set and put them on, but it doesn't work like that. In most cases, sending your heads, or a set you picked up on eBay prior to starting your build to a competent, talented, knowledgeable porter to be altered to your build is the best choice

 

Thanks all for your feedback, I've been hearing a lot of good things about " big boyz heads " and looks like I can send them my heads and have em done for around $300 or so. I appreciate your input on how much the heads effect the performance, like I said I'm still learning the proper way to upgrade my engine and I want to do it correct the 1st time. What comp ratio should it have? I'm thinking it'll be around 9:8:1 or higher and that should be good correct? I was also checking out " Fuel Moto " 98" bore kit, are " Woods " cams and other products good? I can get the whole kit with everything I need for $2,000. Was looking at the TW6-6R cams. Thanks again all for your feedback and not beating me up for my lack of knowledge in this area lol

 

...." big boyz heads " and looks like I can send them my heads and have em done ....

I would recommend you give Bean a call at the shop and talk to him about what you are looking to do before you purchase anything. I think you'll find him very helpful in deciding what components and compression ratio, etc to use. He doesn't sell parts so it wont be a sales pitch, just help.

 

What Don and TT said. Also, you need to think in terms of total package to get the best results. Forget about compression and cam and heads and exhaust as individual items. They are a recipe and will work together or not. Cam and heads will dictate comp. Certain recipes will call for different comp for different levels of performance vs PMS. Where are you in MI?

 

Thanks, I'll give him a call tomorrow and see if he can suggest something. I spoke with Fuel Moto earlier today and was really close to ordering their 98" kit but wanna look at some more options first.

 

Call Big Boyz and talk with Bean...I don't know much about the cam mentioned but when I talked with him about my bike (basically same as yours) I wanted a reliable 95" build with a wide powerband with usable torque curve. The TW37 was mentioned combined with head port and 9.8:1 compression. Was very happy with result.

 

Hi - I ran a 98" kit on my 04 DYNA; these guys are spot on - you have to match the cam timing/duration with the static compression. The longer dur. cams that make power above 3500- 4500 RPM like higher static compression and heads that breath. On my 98", I ran the S&S 585 cams with 10.7:1 static compression. Heads were a set of HD 110 CVO's that were ported by Dunn Performance (He's out in Washington st.). He sells kits on Ebay - you can see some of his head work there. a good 98" will make 100+ HP all day long.

 

98 kits I am involved with are making high teens squared with a tman 590. The heads flow 278-280 cfm. There is no downside, these come on hard fast and pull to 6k.

Those would be fun bikes! My 98" 585 Dyna was a hoot.

 

98 kits I am involved with are making high teens squared with a tman 590. The heads flow 278-280 cfm. There is no downside, these come on hard fast and pull to 6k.

 

The 583 is OK in a light scooter with a light rider. Their down fall is that they are hard starting. I ran a set in a 103 for a while. More top end than the 551's but nothing to write home about past 4000 either.

Based on how you say you ride the 570 or 585 might be better selections. You'll loose a little in the 2-3000 rpm range, but more than make up for it after 3000.

And you might want to consider the easy starts too.

 

The 583 is confused a lot as a hotter than 570 and less than 585. Not even in the same hemisphere.
5˚/18˚ 58˚/24˚ 203˚ 262˚ .583" 96.5˚ 107˚ .113" .206"
18 degree intake close will yield very high cranking pressure on a stock 103"
They have the funny LSA and LC and a huge exhaust lobe and a tiny intake.
A non starter in my book, pass on this or the 551
I don't like telling folks what cam to run unless I am doing other work for them and I know what the heads do. That said there are some that I would tell them to run from. These!
Got a call today from a guy in Michigan. 98" headwork and a 245° 590 lift cam. Made 109/113 with stock TB and injectors, 100tq is there at 2500 rpm and still 100 at 5250. This is more my preference. No PMS and lots of torque and power. Not a fan of the baby pump and dump early cams.

 

If you don't mind me askin, which 590 is he running?