warbags Posted February 18, 2007 Report Share Posted February 18, 2007 I have a stock 2001 banshee,well it has fmf sst pipes and a boost bottle but other than that its stock.It has no more than 60 hrs on it.I did a compresion test the other day and it read 90 in each cylnder so i am going to assume its time to rebuil the top end.But what i was wondering is the crank going to be ok?It runs fine and this will be its first top end rebuild,but some of the dealerships say it may be time for a new crank,is this true or are they just tring to rob me like usual. Quote Link to comment Share on other sites More sharing options...
JET 99 Posted February 18, 2007 Report Share Posted February 18, 2007 the stock crank can go out of phase(relationship between the 2) ... usually you dont have to have it welded in stock form. your crank bearings could have some wear. when you start playing with compression ie.. milled or aftermarket head.. that causes more stress on your crank. if your just gonna do top end, its a good time for porting,aftermarket head, all depends on how far you want to take it. it is good insurance to have crank trued and welded if you are gonna get new bearings. a good time to figure out what exactly do you want out of motor.. hope helps a little, :beer: Quote Link to comment Share on other sites More sharing options...
warbags Posted February 18, 2007 Author Report Share Posted February 18, 2007 Where i live and ride im lucky to get to 4th gear and to be honest it scares the crap out of me stock,so i think i`ll leave it that way.I think the guys getting 70hp are insane, but what i want to know is after only 60 hours on it could my crank be screwed already? Quote Link to comment Share on other sites More sharing options...
mxturd Posted February 18, 2007 Report Share Posted February 18, 2007 I really doubt it,,Im sure your crank is fine,,Mine is a 98 has porting and all kinds of goodies on the stock crank,,Im just waiting for it to give so I can do more to it Quote Link to comment Share on other sites More sharing options...
jmd0346 Posted February 18, 2007 Report Share Posted February 18, 2007 IMO I wouldnt change it just yet. With your mods you could get several more topend builds before really having to do anything major. Now if you decide to up the compression, port, etc... then i would definitely get a T&W crank. Quote Link to comment Share on other sites More sharing options...
JET 99 Posted February 18, 2007 Report Share Posted February 18, 2007 just had my motor done by jeff at fast... he used my stock crank for the build.. 20cc domes I havent checked compression running 93 octane pump gas.. didnt think I need to check jeffs work you should be fine on your stock crank. if your doing a top end that will bring your compression back up. you might think about checking in to your lower end though. if you lose your seals that could be the death of your motor. from what you said your motor does have some age working against it. death is a strong word but you would be looking at tearing it all down again. Quote Link to comment Share on other sites More sharing options...
mybadbanshee Posted February 18, 2007 Report Share Posted February 18, 2007 i wouldnt change it yet 60 hrs really isnt that much.if youve got the money to do it go ahead but i dont see it being necessary.i just put my motor .80 over and i just now put a new crank in Quote Link to comment Share on other sites More sharing options...
warbags Posted February 18, 2007 Author Report Share Posted February 18, 2007 Well 60hrs might have been a high guess,it could be as low as 30hrs but i would hate to think that 60 would be considered high.God forgive me but if thats the case mabye a four stroke is starting to look not so bad. :: Quote Link to comment Share on other sites More sharing options...
BigRed350x Posted February 18, 2007 Report Share Posted February 18, 2007 Shit, I will put 60hrs on my banshee in two weekends of riding. ROFL Quote Link to comment Share on other sites More sharing options...
FireHead Posted February 18, 2007 Report Share Posted February 18, 2007 Shit, I will put 60hrs on my banshee in two weekends of riding. ROFL There are alot of folks around where I live that have never put 60 hours on their bike total. In answer to the original question, I personally replace the stock crankshaft when it's broken. Although for reasons that I won't get into, I used to break alot of crankshafts. Quote Link to comment Share on other sites More sharing options...
mybadbanshee Posted February 18, 2007 Report Share Posted February 18, 2007 yeah i crank my shaft 60hrs every couple of weekend too :biggrin: Quote Link to comment Share on other sites More sharing options...
jeepman380 Posted February 19, 2007 Report Share Posted February 19, 2007 Should tear it down anyway and check the bearings and seals just to be safe. If you have a bad crank seal and you throw a new top end on it chances are you will be putting another new top end on it again. Might as well take a look at the bottom while you are doing it all. Better safe than sorry. Quote Link to comment Share on other sites More sharing options...
black sunshine Posted February 19, 2007 Report Share Posted February 19, 2007 Do a leakdown test before you pull the jugs off. That will tell you the shape of your seals. If you find a leak and end up splitting the cases, then you may decide to have the crank done at the same time! Quote Link to comment Share on other sites More sharing options...
jlsparky7 Posted February 19, 2007 Report Share Posted February 19, 2007 Just replace it when/if it burns up. Theres no point in replacing a perfectly functional part. Quote Link to comment Share on other sites More sharing options...
FireHead Posted February 19, 2007 Report Share Posted February 19, 2007 Do a leakdown test before you pull the jugs off. That will tell you the shape of your seals. If you find a leak and end up splitting the cases, then you may decide to have the crank done at the same time! This is a good point. If you feel that your top end went south due to an air leak, then you need to do this. :thumbsup: Quote Link to comment Share on other sites More sharing options...
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