too_fazt Posted February 11, 2010 Report Share Posted February 11, 2010 (edited) I just got a roller with a busted engine and the crank is in pretty bad shape. i have a crank leftover from my previous build..it spins fine but could use a freshening up. iv never messed with a crank before...would it be better to just buy a used one? any insight would be great. Edited February 11, 2010 by too_fazt Quote Link to comment Share on other sites More sharing options...
papa_smurf49319 Posted February 11, 2010 Report Share Posted February 11, 2010 Just buy a new one, you will have a hard time trying to get it back together and in phase. Not worth it in my opinion. Quote Link to comment Share on other sites More sharing options...
bansheesandrider Posted February 11, 2010 Report Share Posted February 11, 2010 I just got a roller with a busted engine and the crank is in pretty bad shape. i have a crank leftover from my previous build..it spins fine but could use a freshening up. iv never messed with a crank before...would it be better to just buy a used one? any insight would be great. I would not put a used crank in my engine. There is no way to tell if it will last 15 minutes or 15 years. As far as rebuilding it, do you have a press, bearing seperator and the jigs needed to get it apart and back together again? And then you need the V blocks and dial indicator to get it in phase and running true and then a TIG welder to weld it up once everything is perfect. I have been using Twister for the last few cranks in my bikes and my friends bikes that I work on. The crank that is in my personal bike I got to watch Twister build it completly from scratch because it wasn't done when I went to pick it up, so I saw first hand how it was done and I know it was done right because I stood there and watched every step and saw all the dial indicator readings. It wasn't that I doubted their work, I just wanted to see how it was done. They made it look easy, but I wouldn't try it myself and I have everything I need to do it except the welder. Just my .02. Quote Link to comment Share on other sites More sharing options...
papa_smurf49319 Posted February 11, 2010 Report Share Posted February 11, 2010 exactly, i would not hesitate buying a used crank though from someone reputable on the site such as NYUK if they know the amount of hours on the bike, i would then send the crank out to a builder and have them true and weld it and give it a once over. If the outer bearings and the rod bearings are good then there should not be to much of the problem. Quote Link to comment Share on other sites More sharing options...
bholmes Posted February 11, 2010 Report Share Posted February 11, 2010 As far as rebuilding a crank goes, I've done it. Not on a banshee, but on a YZ490. It's a pain in the butt for all that it is. It's just you can't get remanufactured 490 cranks that easily. Price wise though, if you put all new bearings, cheapest you can find, and new crank pin and big end bearings and rod you will have almost as much in a stock crank and stil have all the labor as you would in a remanufactured unit from wiseco or hotrods. I'm not afraid of a used crank if it specs out right. You'll need a feeler gauge and dial indicator to check your tollerances and something to set the crank on to check it's run-out values. The values for crank spec can be found in the banshee manual posted under "useful links" at the top of the mod/repair forum. I am going to use a used crank in my machine, i paid 210 for a stroker crank shipped to my door from ebay from a reputable seller and then checked it's specs when i got it. It speced on the tight side of the specification tolerances so I'm thinkin I should be good. That's just my cheap ass 2cents though. Quote Link to comment Share on other sites More sharing options...
MikeNick Posted February 11, 2010 Report Share Posted February 11, 2010 Just buy a new Hotrods man..You won't be able to rebuild it yourself unless you have a shop full of tools and for the cost of getting it rebuilt you might aswell buy a new one...Or get a used one out of a newer Banshee.. Quote Link to comment Share on other sites More sharing options...
too_fazt Posted February 12, 2010 Author Report Share Posted February 12, 2010 well looks its a paper weight then. lol. thanks for the info guys. Quote Link to comment Share on other sites More sharing options...
bholmes Posted February 12, 2010 Report Share Posted February 12, 2010 If you want a stock crank that's a time bomb just to get it running I have one that's on the loose end of spec I'll send ya if you pay me shipping. PM me if you want it. Quote Link to comment Share on other sites More sharing options...
bansheesandrider Posted February 12, 2010 Report Share Posted February 12, 2010 As far as rebuilding a crank goes, I've done it. Not on a banshee, but on a YZ490. It's a pain in the butt for all that it is. It's just you can't get remanufactured 490 cranks that easily. Price wise though, if you put all new bearings, cheapest you can find, and new crank pin and big end bearings and rod you will have almost as much in a stock crank and stil have all the labor as you would in a remanufactured unit from wiseco or hotrods. I'm not afraid of a used crank if it specs out right. You'll need a feeler gauge and dial indicator to check your tollerances and something to set the crank on to check it's run-out values. The values for crank spec can be found in the banshee manual posted under "useful links" at the top of the mod/repair forum. I am going to use a used crank in my machine, i paid 210 for a stroker crank shipped to my door from ebay from a reputable seller and then checked it's specs when i got it. It speced on the tight side of the specification tolerances so I'm thinkin I should be good. That's just my cheap ass 2cents though. You can't replace the pin in a stock Banshee crank. it is cast as part of the web and then machined. The only way to replace it is to machine it out with a mill and then you need to come up with a pin. Quote Link to comment Share on other sites More sharing options...
bholmes Posted February 12, 2010 Report Share Posted February 12, 2010 I did not know that. I do know you can get crank pins with the rod rebuild kits. http://www.denniskirk.com/jsp/product_catalog/Product.jsp?skuId=CR178&store=Main&catId=&productId=p147893&leafCatId=&mmyId=3165 But i've never dealt with pullin a banshee crank apart, just my YZ and specing banshee cranks. No to thread jack so the reason to weld the cranks on banshees is just to keep those outter webs from spinning? I assumed it was from the fact of how hard it would be to ballance a bazillion piece crank LOL. Quote Link to comment Share on other sites More sharing options...
midlifecrisis Posted February 12, 2010 Report Share Posted February 12, 2010 I did not know that. I do know you can get crank pins with the rod rebuild kits. http://www.denniskirk.com/jsp/product_catalog/Product.jsp?skuId=CR178&store=Main&catId=&productId=p147893&leafCatId=&mmyId=3165 But i've never dealt with pullin a banshee crank apart, just my YZ and specing banshee cranks. No to thread jack so the reason to weld the cranks on banshees is just to keep those outter webs from spinning? I assumed it was from the fact of how hard it would be to ballance a bazillion piece crank LOL. Why is it that you are rebuilding the crank? I am buying a shee this weekend that the kid says will need a new top end and possibly a crank bearing, should I be weary? I have done a top end before in a previous shee, but Im like you, and have never screwed around with the crank! Quote Link to comment Share on other sites More sharing options...
baker Posted February 12, 2010 Report Share Posted February 12, 2010 just buy a new crank their easy to put in just get a clymers, ive done top ends before but i was worried about the crankjob i had to do but man its cake, the shee motor splits top and bottom, so easy to do i just finished mine and it runs great, all new top to bottom Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted February 12, 2010 Report Share Posted February 12, 2010 If your going to buy a bran new crank you might as well go 4 mill. From Jeff at FAST a stock stroke crank is 400 new, 4mill crank is 435. There is added expence of 795 pistons, and cut stroker domes for a cool head. Quote Link to comment Share on other sites More sharing options...
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