jay793 Posted October 20, 2007 Report Share Posted October 20, 2007 Well let me start by saying I dont know to much about moters. Im rebuilding my banshee frame up and trying to get more power, so I got a set of jugs that are ported by trinity (stage 3) and the pistons that he was runing with it that are 68.92mm. I got home and put it all together and theres a problem, the f**king pistons are hitting the head. I bought the banshee off some kid and dont know if the rod is stock or what, but when you look at the intake you can see the ports dont line up like they should, the piston go's to far down and up. So how do I know if I have a stock size rod and is there any way to get some sort of spacer or anything to fix this problem? Here are some pics of what Im talking about. Quote Link to comment Share on other sites More sharing options...
EastCoast Banshee Posted October 20, 2007 Report Share Posted October 20, 2007 looks to me like a 4mil crank. im still kinda confused though did you get the whole motor from him or just the jugs and pistons? Quote Link to comment Share on other sites More sharing options...
Snopczynski Posted October 20, 2007 Report Share Posted October 20, 2007 its either a 4 mill, or a long rod crank. Your gonna need to know what is before going any further. If it is a stroker, you will need to port those jugs for a stroker crank. Quote Link to comment Share on other sites More sharing options...
jay793 Posted October 21, 2007 Author Report Share Posted October 21, 2007 I bought the bike awhile ago and thought it was stock but could be wrong, these jugs were on a stock crank bored and ported heavily, how can I tell if my crank is a 4 mill or long rod? What should I do? Quote Link to comment Share on other sites More sharing options...
fox_forma Posted October 21, 2007 Report Share Posted October 21, 2007 (edited) I was over this guys place putting his shee back together from ground up and it is odd how his jugs are sitting. I personally dont know if he has a 4mill or long rod but what I can tell you for sure is he had the stock heads on there and maybe 1 size over pistons if that (cant remember the size piston right now). He got this stage 3 set up off of a kid who really doesnt seem to know much as well. All the info he could give was it worked with his set up. The jugs are ported pretty hard and it looks like a good job but with the pistons in place they are coming out of the jugs some. It could be a 4mill by the way the pistons are coming out of the jugs but I just dont see it being that, especially when I know where the bike came from and I know it was mostly stock before the swap plus the stock jugs being on there. It would be great if there was an easy way to tell what the crank is to make it easier to solve this issue. Edited October 21, 2007 by fox_forma Quote Link to comment Share on other sites More sharing options...
kawiking Posted October 21, 2007 Report Share Posted October 21, 2007 (edited) does it say hot rod on the rods ?? if so you know its not a stock (yam) crank ..... Edited October 21, 2007 by kawiking Quote Link to comment Share on other sites More sharing options...
fox_forma Posted October 21, 2007 Report Share Posted October 21, 2007 says nothing on the crank as far as I know, maybe jay saw something but i doubt it Quote Link to comment Share on other sites More sharing options...
bansheeseat$$ Posted October 21, 2007 Report Share Posted October 21, 2007 Looks to me like if he bought the cylinders and pistons only and put them on his stock stroke crank its pretty obvious that the KEY word here is 68mm pistons IE blaster pistons which are 115 lenght rods not 110mm.I bet if you measure the rods you will get 110 not 115mm's.Anyways that something to check. Quote Link to comment Share on other sites More sharing options...
jay793 Posted October 21, 2007 Author Report Share Posted October 21, 2007 the only thing it says on the rod is 29L but I have no idea what that stands for, is that stock? Quote Link to comment Share on other sites More sharing options...
bansheeseat$$ Posted October 21, 2007 Report Share Posted October 21, 2007 Yeah 29L is factory rod stamping.So It's pretty safe to say you have a stock yamaha crank and rods. Quote Link to comment Share on other sites More sharing options...
jay793 Posted October 21, 2007 Author Report Share Posted October 21, 2007 Yeah 29L is factory rod stamping.So It's pretty safe to say you have a stock yamaha crank and rods. so with that being said what should I do to fix this problem, is there some kind of spacer I can use Quote Link to comment Share on other sites More sharing options...
bansheeseat$$ Posted October 21, 2007 Report Share Posted October 21, 2007 so with that being said what should I do to fix this problem, is there some kind of spacer I can use You need to find out from the guy you got them from if he had a stroker crank in it or a stock stroke long rod crank in it(IE port timing).If he ran just a long rod stock stroke crank then thats what you'll have to get.But if he had a stroker in it with a long rod then you have to buy that kind of crank and I recommend geting stroker domes and not to use the spacer plate.And being that it is a 68mm bore you have to get big bore domes also. Quote Link to comment Share on other sites More sharing options...
jay793 Posted October 21, 2007 Author Report Share Posted October 21, 2007 (edited) for some reason I think I need a thicker gasket becouse if I put my stock piston in the new jug it still hits the head a little bit, which would tell me the jug has been cut for some reason. No doubt the new piston is taller and hits the head more than the stock one, but if I can get a thick enough gasket wont this solve the problem? also the kid that had it before me (nitroburner13)says he had a stock bottom end, but had a cooper gasket on the head. Edited October 21, 2007 by jay793 Quote Link to comment Share on other sites More sharing options...
jay793 Posted October 21, 2007 Author Report Share Posted October 21, 2007 This is the post from which I bought the set up from http://www.bansheehq.com/forums/index.php?showtopic=84041 Quote Link to comment Share on other sites More sharing options...
bansheeseat$$ Posted October 21, 2007 Report Share Posted October 21, 2007 Acording to that he had stock stroke but he didn't say anything about a long rod,So I'm willing to bet he had a stock stroke with the 115 mm rods.I'm positive that those pistons are long rod pistons from a blaster.You have two choices 1 buy a long rod stock stroke crank or have wiseco get you the proper pistons.I know they make them for the stock stroke cub cylinders that have 68mm bores. EDIT:K I just read that he ran a big coper gasket,Obviously to clear the head,But that's not the right way. Quote Link to comment Share on other sites More sharing options...
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