MRMOONEY Posted September 8, 2009 Report Share Posted September 8, 2009 Can anyone tell me how to identify if I have big bore or small bore shearer inframes? I've heard on the CPI the stinger tube was bigger is this the same deal on these pipes? I don't have a picture so if someone knows the specs I can measure mine. Also how much power am I giving up running the big bore ( assuming that's what I got ) over the small bores on a ported 350? Thanks in advance. Quote Link to comment Share on other sites More sharing options...
MRMOONEY Posted September 9, 2009 Author Report Share Posted September 9, 2009 Can anyone tell me how to identify if I have big bore or small bore shearer inframes? I've heard on the CPI the stinger tube was bigger is this the same deal on these pipes? I don't have a picture so if someone knows the specs I can measure mine. Also how much power am I giving up running the big bore ( assuming that's what I got ) over the small bores on a ported 350? Thanks in advance. Anyone? Quote Link to comment Share on other sites More sharing options...
okbeast Posted September 9, 2009 Report Share Posted September 9, 2009 I'd have to see a picture, I'm not sure what dimension wise is different but with a picture we could probably tell. As for lost power, that all depends on your total setup, porting, etc. etc. But no BB pipes are not usually used on a 350 based bike. Quote Link to comment Share on other sites More sharing options...
03bansheeLE Posted September 10, 2009 Report Share Posted September 10, 2009 The size of the pipe right after the flange that slides onto the jug will determine BB or SB. The SB pipes have a "step down" to a smaller size than the flange while the BB pipes do not. The BB pipes also have a little bend right after the flange and have a smoother radius up into the expansion chamber. I am pretty sure the stinger tubes are larger on the BB pipes aswell. Small Bore Shearers Big Bore Shearers Quote Link to comment Share on other sites More sharing options...
MRMOONEY Posted September 11, 2009 Author Report Share Posted September 11, 2009 The size of the pipe right after the flange that slides onto the jug will determine BB or SB. The SB pipes have a "step down" to a smaller size than the flange while the BB pipes do not. The BB pipes also have a little bend right after the flange and have a smoother radius up into the expansion chamber. I am pretty sure the stinger tubes are larger on the BB pipes aswell. Small Bore Shearers Big Bore Shearers Okay thanks man, looks like mine are the big bore by the pic and what you said. My question until I can get some small bores ( got a killer deal on these big bores ) will I be better off running the fmf fattys I got or these big bores? Stock stroke bored 20 over timing +4 ported ( dune port ) v force reeds cool head I ride in the dunes. Eventually I would like to go with a cub setup maybe 421 ish but that's going to be a while. Would the shearer big bores run better then the fattys? Quote Link to comment Share on other sites More sharing options...
03bansheeLE Posted September 11, 2009 Report Share Posted September 11, 2009 I have not used FMF Fattys nor have I used the BB Shearer pipes but I do currently use the SB Shearers and I would not prefer any other pipe. I would personally go with the Shearers over the Fattys hands down seeing as how you said you ride dunes which means you are mostly using the upper portion of your rpm range. If you were riding in tight trails or MX then the Fattys would probably be a better choice but for your style of riding, Shearers all the way. I can't see the BB Shearers on your engine being worse at all in the top end, just the bottom end due to larger diameter pipe and stingers. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted September 12, 2009 Report Share Posted September 12, 2009 Shearer big bore inframe pipes are rare...and expensive. I don't know if they're even made anymore... Obviously, small bore would be better for your application. It depends on how aggressive your porting is before we can tell you if the BB will work or hurt power much. Quote Link to comment Share on other sites More sharing options...
MRMOONEY Posted September 12, 2009 Author Report Share Posted September 12, 2009 Shearer big bore inframe pipes are rare...and expensive. I don't know if they're even made anymore... Obviously, small bore would be better for your application. It depends on how aggressive your porting is before we can tell you if the BB will work or hurt power much. im not sure of the porting specs i bought these cylinders from a member on here and have not actually ran them yet. At what point if any do the big bores out perform the small bores? what i mean is how big of motor. I am just trying to get an idea of if they will run better then the FMF fattys or should i try and sell these and buy some small bores? Quote Link to comment Share on other sites More sharing options...
nastybynature Posted October 9, 2009 Report Share Posted October 9, 2009 Shearer big bore inframe pipes are rare...and expensive. I don't know if they're even made anymore... Can buy them at Cascade for $675 with silencers. http://67.199.65.66/...ore_dept_id=101 Quote Link to comment Share on other sites More sharing options...
Yamahammer Posted October 23, 2009 Report Share Posted October 23, 2009 im not sure of the porting specs i bought these cylinders from a member on here and have not actually ran them yet. At what point if any do the big bores out perform the small bores? what i mean is how big of motor. I am just trying to get an idea of if they will run better then the FMF fattys or should i try and sell these and buy some small bores? 7Mill cub and bigger run bb anything less small sheer Quote Link to comment Share on other sites More sharing options...
Nightmare Posted August 18, 2012 Report Share Posted August 18, 2012 7Mill cub and bigger run bb anything less small sheer I would run sb on a 7. 535cc or bigger for bb Quote Link to comment Share on other sites More sharing options...
sheerider11 Posted August 18, 2012 Report Share Posted August 18, 2012 I would run sb on a 7. 535cc or bigger for bb I hope this gets to him back in 09 Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted August 18, 2012 Report Share Posted August 18, 2012 Quote Link to comment Share on other sites More sharing options...
vulvafan537240 Posted August 19, 2012 Report Share Posted August 19, 2012 Quote Link to comment Share on other sites More sharing options...
bluebanshee98 Posted August 19, 2012 Report Share Posted August 19, 2012 ive asked someone with a 10mm wampus (465) which pipe he liked better on his bike (bb or sb) and he said the small bores were more consistent/felt better with his motor. i personally love how my shearers small bores feel in the band on my bike. pipes sound nasty too Quote Link to comment Share on other sites More sharing options...
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