Well it has finally happened afer 2 1/2 years of hard riding. I blew the banshee up, nothing spectacular, just broke a ring and wouldnt start. Anyhow, I've got it apart already and am looking at a few options.

Has anybody used Vitos SuperStock pistons? And if so did you like them?

If I get my cylinders ported, do i HAVE to get the crank welded at this time? What is the HP threshold for a stock banshee crank?

Thanks,

RoostKing...

 

I have used the Vitos SS pistons for one summer and yes they are worth it.Now for the crank, since your Shee has many hours of hard riding under its belt yes you should get the crank trued and welded if your thinking about getting your cyls ported.If you get your cyls ported you should know that that there are various options on what type of porting your going to get and also what type of builders you are going to deal with.I see alot peeps here telling us how there mildly modded DS or Raptors beat ported Banshees but i have seen alot of dyno charts of different engine builders and beleive me, some are very good and others are very crappy.Some builders mid to top port job will produce around 55 rwhp wich is very sh*tty but on the other hand you will get 70-80 hp on pump gas from a mid to top job done by a real engine builder wich is very very good and i am talking about a 350cc engine here. A&S Racing out of Michigan can build you a true 350cc Banshee running on alky that will dyno at 94 rwhp and run 4.16 in 300ft sand drags but i doubght this is what you are looking for... Anyway good luck with your new top end.

 

those hp numbers sound pretty optimistic to me.i'm not going to call you a liar they just seem pretty big for a banshee.but i guess it could be possible.but your best bet is to shop around for a proven well known engine builder that can produce quality porting and make you some good horsepower.and a lower end rebuild is highly recommended.
there are alot of builders out there that say they can build monster and end up sending you a powderpuff.more or less they produce alot od BS not horsepower and these are the people that like to do glamour porting.a real porting job is not very pretty or pleasing to the eye but those are the ones that work best.
if you get your cylinders back from your chosen porter and all the ports are real nicely polished and super smooth that is a glamour job and you're probably going to lose power instaed of make power.
it hasn't been figured out yet why air travels faster of a rough finish then a smooth finish but it does.
it not how much air and fuel you can get into to your motor but how fast you can get it in there is what makes the diference.
well i jaw jacked long enough.
good luck and just find a well known company thats been around for awhile those are the ones that do it right ,thats why they are still in business.

 

Well Killerkx i totally agree with you on the glamour porting types but those numbers arent optimistic they are proven facts,70 rwhp is pretty easy to produce on a Banshee and i am not talking about drag port jobs just serious ones that will last you at least a whole summer of riding and most of the time even more than that. You just need to deal with real peeps that knows what they are doing.

 

I put the vitos in for a friend once, it sounded way different, but other than that the powerband seemed very short and awkward and he didnt like it.

 

RoostKing.... It is a must to true and weld crank, if your going with some good porting because what I hear is it isnt a question of what if but rather when it will blow... Call D&M Racing (623) 934-7002 local or Banshee Shack ..Later Digger

 

When I pulled my banshee apart and had it built for TT, I took the crank to be welded. The rods felt okay, but they were very worn when the crank was taken apart. So you might check this. I would have the crank trued and welded on any banshee.
As for those pistons, the only difference is the way that the port windows, and skirts are made. They adjust your port timing. However, if your port job is any good, it will adjust the timing to even better specs. I am using plain old wiesco's in both of mine. They have exactly the same engines with the exception of the play bike has a Trinity head and the TT is recut stock.
As for porting, the exhaust must be polished. The intake must be rough. This causes turbulence and keeps the air velocity up and lets you run a higher air/fuel mix.
I recommend FTZ to everyone. I have had good luck with their engines and they are very helpful. I had a bunch of ideas that I had heard about banshees from individuals and magazines that they helped me sort out. They have built almost everything and know what is worth the money. I was convinced that I needed a aftermarket head on my TT bike also, but they racecut a stock one though and it makes the same power and doesn't run any hotter. If you are interested in talking to them, they can be reached at 573-334-5439. They are in Cape Girardeau, Missouri. Check them out at FTZRacing.com
Just remember, you do get what you pay for.

 

Hey guys,
Thanks for the responses! IM going to go with some standard pistons(non vitos) and get the cylinders ported by Kenz Cycle tech here in Phoenix. Hes going to true and weld my crank as well. Now, have you guys ever had your stock carbs bored? Of so, did think it was worth the money? Thanks for all the help.

RoostKing...

 

killerkx327
I don't think it is a matter of rough surfaces flowing more, but a matter of the rough surfaces causing the fuel and air to mix (atomize) more completely. You open up the intake ports to allow more flow, but leave them rough for better mixture going into the combustion chamber.

Many times the intake is left rough, but the exhaust is polished smooth. You want the exhaust smooth as to allow the spent exhaust gasses out quicker, and without turbulence.

The same principle has been applied to car motors from automotive engine builders for some time now.

 

Hey Roostkig Give it up and come hang with the Bad Boyz. Go buy Jerrys quad (A POLARIS). Just kidding call Richard at Richards ATV 623-939-3181 He will set you up. Tell him Dennis with the Polaris sent you.