mixmastermike09

I did use a diamond hone on it, it wasn't bad just took a couple passes to clean it up good. Thanks for the jetting info...

Well guys, I think I have found the problem... Ran a leakdown on it tonight and discovered the left cylinder was leaking quite a bit. Pulled the head to find some guad marks in the cylinder wall... Went ahead and pulled the Jug and piston on that side and discoverd a cracked sqirt on the piston... Fortunatly the cylinder cleaned right up with a couple passes on the hone, got a new piston and rings / gasets and such on the way. On another note - Wondering if anyone can give me a ballpark on jetting with this setup - so I will have a ballpark jetting when I get it back together this weekend. 421 Cub (Stock Porting) - 39mm PWK Carbs w/ 8" K&N's - VForce 3 Reeds w/ billet spacers - Shearer oof SB Drag Pipes I'm on the east coast NC 135ft elevation (Sea Level) Temps in the 75-85 range currently Not looking for dead on, just a good starting point so I will know what I need to get ordered. Thanks again guys!

Thanks Man, This is exactly the kind of info I was looking for, a good place to start checking... I will go through it this afternoon and report back my findings.

Nah, I have 2 MyChron's and 2 Digitron's that I run on serveral other things and they all check the exact same. And yes I have them set for 2 Sparks per rev... I've been building 4 stroke Kart Racing engines for 15yrs and several V8 Drag motors... I'm not a rookie engine builder, but I am a little new to the banshee engines. Just looking to see if anyone has ever ran across this issue before. Thanks for all the feedback tho guys....

Hey guys, I know that the pipes with the setup arn't the best/proper for drag, but It's what I have right now, until the drag pipes come in... At any rate, even with stock pipes it should turn in the 8K range...

Domes are 22CC - Right off the top of my head I can't remember the jetting, I purchased the carbs new from the guys at FAST and they sent me the jetting for my mods and altitude. No plug chop thus far. Have not done a leakdown, but I will when I get in from work this afternoon. Timing is at 0 It occurs in every gear including neutral - both pistons are installed correctly. Basically when it gets to around the 5300 range it just levels off, if anything there may be a little spit back through the carbs, it comes close to sounding like a car with a rev limitier... I have a MyChron Digital Tach and Temp Gauge hooked up and set correctly to monitor rpm & head & coolant temp. As for your question on the Pipes, yes they are to my understanding for bottem end power, but they were with the bike when I purchased it, so I'm just using them for time being.

Hey guys, New here on HQ and looking some suggestions or to see if any of you have ever seen this issue. Background... Fresh build - 4 Mil Cub - New Cub Cylinder/Piston/Rings - New 4 Mil Crank - New 39 PWK's from FAST - New Cool Head DMC Alien Pipes - Stock Stator - Stock CDI - Stock Coil - VForce 3 Reeds Bike runs strong up to about 5,300 rpm and then it just levels off, won't turn any harder... Looking for any suggestions on what to look for. Ex: Stator ? Coil? All and any help appreciated. Michael