PassionRE

Pinning is better, more expensive, and makes rebuilds more tedious. It suprises me that the manufacturers havn't fugured out the cure.......such as pressed fit splines. No twist problems, twice the surface contact area, and no truing neccessary...maybe they will read this and save us all the pain....Jim

Crank seperation is pretty normal on Banshee engines regardless of compression and porting it seems. High RPM really isnt that big of a factor as much as jumping and sudden repetetive rpm fluxuations. Even with all this mind, after a couple of seasons on a crank they will start to seperate. Welding doesnt cure this but does tend to slow it down. Many engines I've torn down that have been welded previously have cracked the welds and started to seperate anyway...a very old problem. Out of phase problems are much more rare but do happen. If your engine is basicly stock and fresh, just ride it till you do upgrades and plan on welding at that time. From what Ive seen, abuse is easily described as just riding the thing...I've seen how you guys ride!.....Jim

Sorry for the slow reply..ck you messages and get back to me...Jim

Oilsmoke, honestly I haven't found a pipe that doesnt just haul ass on this engine. Even with the High Rev pipes these 12 port strokers make more bottom end than anything you could ever concieve with a 350 engine...bar none. Thats why I push them so hard, they are just a whole new world of Banshee power delivery on a budget...you can have your cake and eat it too. I cant think of anything this motor doesn't do well. Did you say Sheerers?.... ....Jim

Jeff, if your going to want a 12 port, hold off on polishing them out yet because of the welding involved....Jim

A TT track is basicly a big oval track with approx 1/3 of the track being in the infield with a few sharp turns and bumps and then back on to the oval track. Its a real test for rider, suspension, and yes my favorite pastime, ..Horsepower!...Jim

. 100LL Avgas has a octane rating of 99.5 at lean carb jetting and at rich carb settings it has a octane rating of 130! Avgas allows internal combustion engines to run cooler at leaner jetting even at near stoichometric ratios. More sophisticated piston aircraft engines can be jetted in flight while monitoring cylinder head temperatures of each cylinder simutaniously and this allows for maximum fuel efficiency while maintaining safety from detonation. I'll also add that you would be hard pressed to find a engine that is more prone to detonate than a variable pitch propeller aircraft engine without the use of Avgas. And it burns cleaner than automotive fuel as well. Like I said, not a replacement for race fuel, but more than adequate for anything less than a full blown race engine....Jim

Avgas is not a blanket fuel for any purpouse. In an all out purebred race engine race gas is best...period. For engines that are in that grey area of potential detonation, Avgas is fine...and yes, the Octane is definately higher than 92 automotive fuel. As for damaging to 2-strokes, 20 years of use never showed that to me. I broke the waterspeed world record in 91 with a replicated H-2 Induction Kawasaki 536cc twin 46mm sidedrafts running 305psi on avgas and that motor was dependable enough to let my daughters run around the lake on all day long, and those motors are under 6 times the stress, and much more likely to detonate than a Banshee motor...Jim

An old guy like me would have to add a 50 shot Oxygen bottle to my face mask at 8200 ft...Jim

50 pilot,180 main...Jim

What he said................Banshee cranks are designed with harmonic averaging in mind just as most any internal combustion engine. The only truely effective crank balancing design over a broad rpm range is internal compensating counter-balancers simular to what is used in Lycoming Aircraft engines...Jim

LMAO...no Jeffro, your engine was intended to do one thing and one thing only...exactly what YOU wanted it to be. The version Im thinking of for the future would not be what your looking for...trust me...Jim

It's in the works, in my brain anyway...a +4 redesigned and improved. I will have to make custom sleeves though and It wont be cheap. TBD, I dont offer any 6 pack o' pistons per weekend motors currently and dont intend to offer any to the general public. Those motors are reserved for very special circumstances. I would say these strokers are very reliable. Proquad101 is a animal and nobody can abuse a engine like he can and so far no failures of any type in the harshest racing enviroments..Jim

that would be intresting NAX, i think personally youd starve jims port with a single carb, in my opinion all that trinity 2 into 1..1 into 2..3x4=12 crap......is just advertising bullshit, each cylinder should have its own carb, pouring in as much fuel as the jug can handle, down its throat......companies like honda and of course yamaha have rarely produced multiple cylinder motors with single carbs, jims reading this thread lets see what he thinks, im by far not a motor guru, but ive been riding dirt bikes about 37 years and have yet to see a twin with a single carb smoke a well tuned twin with dual carbs, sometimes you'll see a bansh with a single carb get some fair bottom, but who gives a shit if all you have to do is feather your clutch to get it in the power band and pass the guy..lets see what jim thinks.....and i think low gears on a stroker are useless, if you had a 500 horse motor geared the same as a 50 horse motor all youd really have is a motor than can get to the same top end sooner, i learned that my first ride on jims engine, i started out geared 15/41 with my stroker and instantly geared it up taller, that much power with low gearing is actually slower in the dirt than a lower horsepowered shee, cause the vicious power of the stroker just spinns and is basicly out of control, it takes taller gearing to get those ponies to the ground, and the taller gears providing the motor can pull them accelerate twice as hard and fast, anyone running a high horse powered shee will tell you that....... Nax, Im having a little trouble following your posts, but if your referring to running a single carb or a 2-1 exhaust etc. on my 12 port stroker, your defeating the purpouse of this engine. Let me explain, this engine is crisper than most any engine combo with a single carb and Dyno-port type pipe with twin 34's and hi-rev pipes. These intake ports have more area than a T-rex motor and uses everybit of it....and thats the milder version like Dueces motor, not the mildest, but Dueces motor was specifically ported for his needs and Top- end wasn't one his major concerns, although I explained to him that top-end would definately be a side affect of the porting style he was looking for. I also build more top-end friendly versions as well. Not that the 2-1 carb and pipe wouldnt work well, its just you would be giving up tons of acceleration and top-end with it....which may or may not be of concern to you. If your partial to the carb pipe combo you are running a modified version(detuned) would probably be better for that situation..the possibiliites are endless and all achievable....Jim

I would like to think of those early days as "sacrificial research"....Jim

Wow, just think of all that work I couldnt get done! ...LOL, seriously, Ive got so much work Im just numb as it is. Theres only so many hours in a day and I cant trust anyone to port these engines for me. Just think of the liability of messin' up the cylinders and I assure you the results wouldnt be the same. Although.... I wouldnt mind sitting on the beach occasionally watchin' those rad babes out there....Jim

Good Question Joe, That information was given to me by a very good friend who owns a Local Honda dealership...I consider him a good source. Please, nobody prove me wrong, 4 strokes blow...Jim

Supposedly, the 2006 emission laws dont apply to racing motorcycles and quads...lets hope so. Although the Banshee is long overdue for frame and suspension upgrades, the current engine is just a jewel in its current form(except for the trans and shifting mechanism), and is capable of tremendous horsepower...Jim

Matt, in a nutshell it sounds like your looking for a +4 stroker if case mods etc. are not in your game plan. You can drop a +4 right in with no case mods. BUT, if you dont port the cylinders and compensate for some strange things goin' on in your motor with that stroker crank with the stock port configuration, you wont even scratch the surface in available power...Jim

"Best " is a relative term. "Biggest bang for the buck" on the other hand is unquestionably IMO, a H129 +4 stroker Wiseco crank, 795 series Wiseco pistons fit to your bore ,and matched porting for your riding style. Approx. $1100-$1200 total package depending on your needs in porting. Add some bigger carbs and a set of good pipes and you have a real handfull on tap at any moment...Jim

12 port strokers are $475.00 and 350's are $450.00. Sounds like alot ,but the work involved to build those baby's is unreal. It takes me 20 hours to build just one set...do the math on that one....Its not your average port job by any means...Jim

I need a set of trashed out cases. As long as the top half around the cylinder studs is intact, thats good enough....Jim

Check radial and thrust clearances on the rods(both sides). Check the inner bearings for roughness and noise, they are usually pretty tough. If all ck's well, weld and true the crank and replace outer bearings...Jim

12 ports have two additional intake ports(finger ports), and two window ports added to the liners below the rear transfer ports...Jim

Same plate approx .080". You have to run 795 series Wiseco's with the long rods..Jim