smeagol Posted September 15, 2007 Report Share Posted September 15, 2007 hi guys i have a 4 mil 421 cub, clean up port from jeff, 39 pwk, +5 timing, shearers. though my electrical seems to check out, i was wondering if bad crank seals could be to blame for this? banshee has trouble cleaning out. If i dont rev 4th to the moon prior to shifting, it won't clean out in 5th. Even when i get th revs built up my guess would be it is in the 40 hp range. My brothers shee completly rips exact same setup everything. and jetting. My question is, should i tear down and check crank seals, and crank pressure? Quote Link to comment Share on other sites More sharing options...
smeagol Posted September 15, 2007 Author Report Share Posted September 15, 2007 also does anyone know anyone in minnesota that they have had good luck with for a mechanic? thanks again Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted September 15, 2007 Report Share Posted September 15, 2007 have you checked compression? is your coil grounded well? i mean coil to bare metal on the frame. make sure your grounds are good as this will cause the same problems youre describing. remember, no 2 motors are the same so just because your brothers is right on doesnt mean yours will be too. Quote Link to comment Share on other sites More sharing options...
spurdy Posted September 15, 2007 Report Share Posted September 15, 2007 I had a similar problem. I could tell on mine that I had one cylinder that didn't fire the same as the other. It ended up being a reed valve problem. The higher the RPM the better it ran. Low RPMs sucked. Once I got into higher gears i could keep the RPMs up to enough to run. I was running reed spacers to clear the clutch actuator arm. The v-force reed was falling out of the frame into the spacer which made it run like shit. Simply changing the location of the spacer to the other side of the reed cage frame was the solution. Don't know if this is your issue or not, but, if the reed valve does not "flutter" it does not perform its intended function. Good luck! Quote Link to comment Share on other sites More sharing options...
smeagol Posted September 16, 2007 Author Report Share Posted September 16, 2007 i took off the coil, ground the paint off where it mounts, You where right on locogato! It runs great! Thanks so much Smeagol Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted September 16, 2007 Report Share Posted September 16, 2007 i took off the coil, ground the paint off where it mounts, You where right on locogato! It runs great! Thanks so much Smeagol no problem man. those fuckin coils can cause major problems.. i had the same type of issue. it drove me crazy for a while until i figured it out.. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.