trickedcarbine Posted November 19, 2013 Report Share Posted November 19, 2013 I am finally moving on my new motor and it's time to figure out crank options. I will be doing stock cases with a forged 10mm crank but I'm not sure if I should go with the bigger 125 rod or the regular ol 115 rod. Only other question is big bearing or stock TZ/Max Load bearings. I know the bigger bearing is more case work, but the cases are already gonna get bored, port matched, and trenched. Btw the crank is for 75mm twister mini. Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted November 19, 2013 Report Share Posted November 19, 2013 Who is building the motor? Quote Link to comment Share on other sites More sharing options...
m671054 Posted November 19, 2013 Report Share Posted November 19, 2013 (edited) Do people put big bearings in stock cased? thought it was only for billet. i would run good tz skf explorer bearing with brass color ring and max loads for the rest all stock size. Are they special pistons just for this application or are the standard for another engine? Edited November 19, 2013 by m671054 Quote Link to comment Share on other sites More sharing options...
sprinklerman Posted November 19, 2013 Report Share Posted November 19, 2013 I know I've had real good success with my forged 10mm using a good tz and maxload. But..it gets throughly inspected at the end of each season. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted November 19, 2013 Author Report Share Posted November 19, 2013 Who is building the motor?Lew will do the cases, cylinders, and domes. I'm assembling. Cylinders are gonna be pretty close to the way they sit on the shelf. Lew kind of insisted that I get it assembled and ride it as is before porting, that way I'll know what changes I would like. If there is any port work it will be from dan hull. Been in contact with him for changes to my current set up and am more then confident he can help me out again. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted November 19, 2013 Author Report Share Posted November 19, 2013 Do people put big bearings in stock cased? thought it was only for billet. i would run good tz skf explorer bearing with brass color ring and max loads for the rest all stock size. Are they special pistons just for this application or are the standard for another engine? from a Kawasaki application as far as I know. They are readily available though. As far as the big bearing in stock cases..... I'm not totally sure. That's why I'm asking. I have seen an old crusty T Rex bottom end that had the bearing locations bored though. Just don't know if a lot of guys are doing it. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted November 19, 2013 Author Report Share Posted November 19, 2013 I know I've had real good success with my forged 10mm using a good tz and maxload. But..it gets throughly inspected at the end of each season. I'm on board with a forged crank and your bearing choice as I already have straight cuts. So is that a 115 rod? Quote Link to comment Share on other sites More sharing options...
sprinklerman Posted November 19, 2013 Report Share Posted November 19, 2013 I'm board with a forged crank and your bearing choice as I already have straight cuts. So is that a 115 rod? Yea. Just a plain Jane 115 rod crank works forged. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted November 19, 2013 Author Report Share Posted November 19, 2013 Right on. Exactly what I was looking at. Quote Link to comment Share on other sites More sharing options...
m671054 Posted November 19, 2013 Report Share Posted November 19, 2013 My question was are both the 115 and 125 rod pistons shelf parts or are they special like some cheetah stuff. if both are shelf go longer rod. sounds like a fun setup. can you pick your reeds on that cylinder? Quote Link to comment Share on other sites More sharing options...
banshee760 Posted November 19, 2013 Report Share Posted November 19, 2013 In my experience , I've only have delt with 115 rod 10 mil cranks in wich it seems that it's getting harder to get pistons for that rod size on the bigger bores meanin 73.50 and up (not saying there isn't , like a 250 R piston) , but seems like those Kawasaki pistons lew uses are meant more for the 120/125 rod and there is way more availability , but that's just my expirience , usually I just run T. rex cilinders wich in most cases have a lot in comon w the twisters , also a&s does a great job porting , but from what I've heard LC performance is the way to go on these type of cilinders , not knocking or amping anyone down or up as I have never dealt with them , we have a couple of twister and T. rex setups and they haul ass , I've seen how much material you need to take out ( port) to make em run real good , we also do a diferent porting figure to the piston than I have seen other people do , just my 2 cents I'm pretty Shure ho ever or whatever you end up , your gonna be pretty happy , gl Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted November 19, 2013 Author Report Share Posted November 19, 2013 My question was are both the 115 and 125 rod pistons shelf parts or are they special like some cheetah stuff. if both are shelf go longer rod. sounds like a fun setup. can you pick your reeds on that cylinder?Yes on the pistons for 115 & 125. And I'm ordering it with both sets of flanges on intake and exhaust side. Quote Link to comment Share on other sites More sharing options...
Whitbread Posted November 19, 2013 Report Share Posted November 19, 2013 I don't know squat about monster banshee motors so I wont pretend to; but if the correct pistons are easy to get, run the long rods. It will increase the duration peak cylinder pressure can act on the crankshaft effectively and lessen side loading of the piston since the rod angle will be less. Once I get the EFI setup on my bike dialed, this sounds like a kickass setup to put it on . Once I have it ironed out, I think all the parts can be purchased for less than $1000 easily. Copy over the cal file, increase fuel tables and vroom vroom. Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted November 19, 2013 Report Share Posted November 19, 2013 EFI????? Quote Link to comment Share on other sites More sharing options...
Whitbread Posted November 19, 2013 Report Share Posted November 19, 2013 EFI????? I have a build thread in the images section, apparently not many people make it over there haha. Quote Link to comment Share on other sites More sharing options...
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