Upgrade path for my 2003 Banshee?

[Izord]

Hey,

I have an '03,  with low hours on a Dune ported motor that I sent to Dan at Patriot racing 15 years ago.  He welded and balanced the crank, put a 70hp dune port, lockout clutch, Noss Head with like 21cc domes, (125psi at 4000ft), and I have T5s and 28mm Keihin's, and a Dyna FS CDI.  It's stock bore.

I just woke it up after setting 10 years in a barn.

Could I put a 4mil crank with domes or a spacer plate now, then next season put like Cub or Assassin 68mm cylinders?

 

Thanks.

[locogato11283]

Skip the BS and go right to the 4mm Assassin. Don’t even waste your money on the in between.

[specialblend07]

14 minutes ago, locogato11283 said:

Skip the BS and go right to the 4mm Assassin. Don’t even waste your money on the in between.

 

I'm with stupid ^

 

 

 

 

[Izord]

Now I have to do some work on it.  I said low hours in the first post because I got it new and didn't take it out much.  I replaced the original tires after a few month twenty years ago, and those replacements still have  most of their tread.  Took it to little Sahara once and local trails and lake dunes probably like 15 times. Also have another set of paddle tires I'd swap out for the Dunes, so they shared some wear, but they still look new.  The original brake pads hardly had any wear.  I just replaced them with YFZ450 brakes.

But I ran it enough it has a stuck ring and light marks on the cylinder and lightly scuffed pistons.  I lost 20 pounds of compression on the left cylinder last week after like a one hour ride then it wouldn't start after getting flooded the next day, so I pulled the head and saw the stuck ring.  It was a dune port with 19cc domes on race gas.  Then it had VF2's, but when I checked them, one of the reeds was starting to fray, so it had enough wear.   

So I gotta do something.  Hopefully not having to buy new carbs.  I'd rather get a stroker crank.

Can I run those Assassin cylinders on 28mm Keihin PWKs?  What's the biggest displacement I can run with my carbs bruh?

Hey thanks for the answers before!

Edited July 6, 2023 by Izord

[SKEETER]

Message bill scheel,   BansheeHP on here.   Hes doing those cyls, can get you lined out. 

[specialblend07]

On 7/6/2023 at 6:44 PM, Izord said:

Now I have to do some work on it.  I said low hours in the first post because I got it new and didn't take it out much.  I replaced the original tires after a few month twenty years ago, and those replacements still have  most of their tread.  Took it to little Sahara once and local trails and lake dunes probably like 15 times. Also have another set of paddle tires I'd swap out for the Dunes, so they shared some wear, but they still look new.  The original brake pads hardly had any wear.  I just replaced them with YFZ450 brakes.

But I ran it enough it has a stuck ring and light marks on the cylinder and lightly scuffed pistons.  I lost 20 pounds of compression on the left cylinder last week after like a one hour ride then it wouldn't start after getting flooded the next day, so I pulled the head and saw the stuck ring.  It was a dune port with 19cc domes on race gas.  Then it had VF2's, but when I checked them, one of the reeds was starting to fray, so it had enough wear.   

So I gotta do something.  Hopefully not having to buy new carbs.  I'd rather get a stroker crank.

Can I run those Assassin cylinders on 28mm Keihin PWKs?  What's the biggest displacement I can run with my carbs bruh?

Hey thanks for the answers before!

 

Your best bet is to call a builder and tell them your budget and want you want

[Izord]

I just got 'em back. Bored 64.50 and Wiseco's.  

[specialblend07]

10 hours ago, Izord said:

I just got 'em back. Bored 64.50 and Wiseco's.  

 

Nice, however, just boring out the cylinders wont gain you any power if that's what you were going for.

[Izord]

10 hours ago, specialblend07 said:

 

Nice, however, just boring out the cylinders wont gain you any power if that's what you were going for.

Yeah, just got a stuck ring a few weeks ago, and I wanted to ride.