TurboBanshee420 Posted July 1, 2009 Report Share Posted July 1, 2009 I was wondering.... Since I don't want to waste a set of $1k cylinders when I start putting a hurt on this thing. You guys are just dropping a set of wiseco's in these cubs? No sizing...??? I have heard engine builders tell me that wiseco has a tolerance of +/- .0003 on all pistons. However I have gotten pistons from them for my 670 and they were .0012 oversized. I resent saying this, but should I just drop 68mm pistons in like every other shmo or is this common practice for you professionals too? I have all my motors sized for the slugs....they last longer with hot set-ups. I consider myself a rotax expert now...(from all the times I have roached my 670 over the years). Nik cylinders are different though. They are slightly less forgiving. *shrug*....drop a few pennies. I wanna see what u think. Quote Link to comment Share on other sites More sharing options...
blowit Posted July 1, 2009 Report Share Posted July 1, 2009 I was wondering.... Since I don't want to waste a set of $1k cylinders when I start putting a hurt on this thing. You guys are just dropping a set of wiseco's in these cubs? No sizing...??? I have heard engine builders tell me that wiseco has a tolerance of +/- .0003 on all pistons. However I have gotten pistons from them for my 670 and they were .0012 oversized. I resent saying this, but should I just drop 68mm pistons in like every other shmo or is this common practice for you professionals too? I have all my motors sized for the slugs....they last longer with hot set-ups. I consider myself a rotax expert now...(from all the times I have roached my 670 over the years). Nik cylinders are different though. They are slightly less forgiving. *shrug*....drop a few pennies. I wanna see what u think. I have not had a problem with the Wiseco pistons in a long time though we do check every single one before installation. You are certainly paying attention to the details. I have had JE and other piston OEM sizing issues with the YFZ450s on big bore goods but nothing yet on the Banshee. It does rather suck that the plate thickness of the NiSiC os so thin that you can rarely hone to spec if needed. My recommendation is to buy the pistons and measure them before installing. If they are not right, call Wiseco and bitch at them but make sure your numbers are accurate. IME, we see about +/-.0001 with Wiseco pistons as of the last few years. I am not really defending them and I think some of their forgings are a little light but their tolerances seem pretty on lately. B Quote Link to comment Share on other sites More sharing options...
okbeast Posted July 2, 2009 Report Share Posted July 2, 2009 This may be a bit off topic but could help some. For those that have had cylinder nikasiled or renikasiled, would the company you had do this take your pistons in hand and spray the coating then hone it out to the piston size you have? Or are they just doing them to 68mm, or w/e bore you have. Quote Link to comment Share on other sites More sharing options...
FireHead Posted July 2, 2009 Report Share Posted July 2, 2009 I have not had a problem with the Wiseco pistons in a long time though we do check every single one before installation. You are certainly paying attention to the details. I have had JE and other piston OEM sizing issues with the YFZ450s on big bore goods but nothing yet on the Banshee. It does rather suck that the plate thickness of the NiSiC os so thin that you can rarely hone to spec if needed. My recommendation is to buy the pistons and measure them before installing. If they are not right, call Wiseco and bitch at them but make sure your numbers are accurate. IME, we see about +/-.0001 with Wiseco pistons as of the last few years. I am not really defending them and I think some of their forgings are a little light but their tolerances seem pretty on lately. B Without regard to the Banshee style engine, JE can nibble on my nutsack....... They're QA sucks. Mahle is great and so is CP (though I have had strict control of the product I was using from both companies). With regard to a Banshee piston, Wiseco is pretty much the only way to go. You need to measure them yourself, and if you get something out of spec., send it back......... make sure you clearly document the issue and call them on their crap. You will more than likely not have an issue though. :geek: Quote Link to comment Share on other sites More sharing options...
FireHead Posted July 2, 2009 Report Share Posted July 2, 2009 This may be a bit off topic but could help some. For those that have had cylinder nikasiled or renikasiled, would the company you had do this take your pistons in hand and spray the coating then hone it out to the piston size you have? Or are they just doing them to 68mm, or w/e bore you have. Millenium is pretty good for the coating, but they won't do anything if you send them a piston.... You need to measure your stuff and hone to suit. Millenium has always seemed to coat thicker than necessary. Quote Link to comment Share on other sites More sharing options...
okbeast Posted July 2, 2009 Report Share Posted July 2, 2009 Millenium is pretty good for the coating, but they won't do anything if you send them a piston.... You need to measure your stuff and hone to suit. Millenium has always seemed to coat thicker than necessary. Ya I know Millenium was kinda tops for it. I wonder how many "new" cubs come from CP out not really at 68mm. Or I wonder if Calvin hones them back to what they're suppose to be when he gets them back from him. What kinda hone would u recommend for the nikasil since it's a pretty hard coating? Quote Link to comment Share on other sites More sharing options...
TurboBanshee420 Posted July 2, 2009 Author Report Share Posted July 2, 2009 diamond ball hone is what you should be using on nik bores. But do NOT over do it. some companies will size the holes for you, some will not. Kustom Kraft will... They did my GASGAS...which is th eonly company who will fuck with GASGAS btw... They skim bored my cylinder and re-nik'd .006 thick and sized a wiseco slug to fit perfectly. Great job too!!! I have no experience with anyone else for nik coatings. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted July 2, 2009 Report Share Posted July 2, 2009 I've been told to use a diamond hone as well....but I'm not real good at listening. I just used a run of the mill BB hone with solvent pouring through the cylinder, no issues. I've yet to have a piston to wall clearance out of the box on any 68 bore cub I've worked on, but...I did have to file a ring or two down just a hair. Quote Link to comment Share on other sites More sharing options...
TurboBanshee420 Posted July 2, 2009 Author Report Share Posted July 2, 2009 I've been told to use a diamond hone as well....but I'm not real good at listening. I just used a run of the mill BB hone with solvent pouring through the cylinder, no issues. but...I did have to file a ring or two down just a hair. "BB hone"??? maybe I'm a bit tipsy, but I'm not following... ring thing is a given, most are too big a gap already though. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted July 2, 2009 Report Share Posted July 2, 2009 It's actually called a flexhone. I've called it a bb hone for years, you'll see why. http://www.brushresearch.com/flex-hone.php...CFQzxDAodQESuBA Quote Link to comment Share on other sites More sharing options...
TurboBanshee420 Posted July 3, 2009 Author Report Share Posted July 3, 2009 It's actually called a flexhone. I've called it a bb hone for years, you'll see why. http://www.brushresearch.com/flex-hone.php...CFQzxDAodQESuBA yes that is what I refer to as a diamond ball hone...I bet you can also see y I call it that. All though the difference being one has stones and the other has diamond dust impregnated composite balls on the bristles Quote Link to comment Share on other sites More sharing options...
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