Timshee Posted January 13, 2014 Report Share Posted January 13, 2014 Ok I got a good deal on a set of pretty much new bb shears I want to run them on my 421 cub I had cpi sb before how are these going to do did I screw up?its a k&t cub 40 lectrons ect Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted January 13, 2014 Report Share Posted January 13, 2014 You screwed up. That motor needs the small bore pipes. Quote Link to comment Share on other sites More sharing options...
WINDYCITYJOHN400 Posted January 13, 2014 Report Share Posted January 13, 2014 Hey.....that's my job chief! LOL Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted January 13, 2014 Report Share Posted January 13, 2014 Hey.....that's my job chief! LOL Too slow! You may need to increase your daily vitamin dosage. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted January 13, 2014 Report Share Posted January 13, 2014 (edited) They should be small bores. Unless maybe you hot lap motors 8-10 times it mike make that kind of heat, but a set of small bores would do it justice. Not sure on the difference but I know the cut off for big bore pipes is a bit different between CPI and Shearer Edited January 13, 2014 by trickedcarbine Quote Link to comment Share on other sites More sharing options...
Timshee Posted January 13, 2014 Author Report Share Posted January 13, 2014 I'm just going to get some sb if anybody has some I'm ready to buy Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted January 13, 2014 Report Share Posted January 13, 2014 I'm just going to get some sb if anybody has some I'm ready to buyGood luck on that. I let a buddy bolt my shearers on this weekend and that poor bastard had to cave and order a new show chrome set from fast. The used ones literally list for minutes to hours, then they're gone Quote Link to comment Share on other sites More sharing options...
mailman Posted January 13, 2014 Report Share Posted January 13, 2014 I would try to run the big bores and see how they do. I have seen some really good running 421 motors with Shearer Big Bore inframe pipes. The small bore Shearers will be better for a drag motor but at least you could run the bike until you get a set of small bores. Quote Link to comment Share on other sites More sharing options...
Tedder Posted January 14, 2014 Report Share Posted January 14, 2014 I still have these. Hand coned - Quality chrome - Small bore/Small flange one out each side with EGT ports. Link to pic of right pipe before and after being repaired by Matt Shearer and of the left pipe. http://bansheehq.com/forums/index.php?showtopic=170860&hl= Quote Link to comment Share on other sites More sharing options...
Tedder Posted January 14, 2014 Report Share Posted January 14, 2014 Lots of variables when it comes to pipes. My 4mil cub with Shearers has been 3.91 in the 330 on asphalt with a 1/4 mile setup. Quote Link to comment Share on other sites More sharing options...
Tedder Posted January 14, 2014 Report Share Posted January 14, 2014 Quote Link to comment Share on other sites More sharing options...
WINDYCITYJOHN400 Posted January 14, 2014 Report Share Posted January 14, 2014 I'd run what you own. (Like everyone else does) Then if the bike runs at all you can tell everyone how you ran BB pipes on a motor that SB pipes were specifically designed for and they worked. You won't have anything to compare them to…….So you can tell everyone they worked great. (Kinda like everyone else) LOL Or….you can call the guy that designed and built the pipes and he'll tell you what a bad idea it is and how much more you can make with the right sized pipe. Or…..decide to "Try them and see" Like everybody else does……….. 1 Quote Link to comment Share on other sites More sharing options...
S-oregon Posted January 15, 2014 Report Share Posted January 15, 2014 I know the sb shearers are designed for the 4mil cub but my buddy ran shearer big bores and his redline ported cub ripped!. I'd try the big bores and see. But If your going to sell the big bores I might be interested. Quote Link to comment Share on other sites More sharing options...
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