daisy Posted January 6, 2008 Report Share Posted January 6, 2008 i have a 1987 stock banshee. It has never been bored out. It has a boost bootle and fmf pipes on it.I ran a compression test on it and have 140 on left side and 0 compression on right side.When i take the motor apart what should i look for?? Will there be anything noticable to show why there is no compression the right side?? Quote Link to comment Share on other sites More sharing options...
Fireroad Express Posted January 6, 2008 Report Share Posted January 6, 2008 (edited) the cause of the compression problem should be instantly identifiable upon taking the cylinder head off! look for a big hole in the center of the piston, or a piston cracked around the edge with a broken ring. when was the last time the engine was running? Edited January 6, 2008 by the grinch Quote Link to comment Share on other sites More sharing options...
spurdy Posted January 6, 2008 Report Share Posted January 6, 2008 I agree with ^^^^^. Sounds like a hole in the piston. As far as the bore......don't bore any more then needed to clean up the cylinders. Hone only if you can get by with it. But, with an '87 that has never been bored I would suspect the cylinders walls will need some dressing depending on how much it has been used. Wiesco sells stock pistons in 0.010" increments I believe. Starting at 0.010" over stock which is 64mm. So the first oversize is 64.25mm. Keep your bore as small as possible as this is the life of your engine. Punching the jugs out to increase cc is silly. SP :thumbsup: Quote Link to comment Share on other sites More sharing options...
sheerider1026 Posted January 6, 2008 Report Share Posted January 6, 2008 i think you guys covered this one.. enough said.. i also suspect the holy piston.. lol Quote Link to comment Share on other sites More sharing options...
daisy Posted January 6, 2008 Author Report Share Posted January 6, 2008 the cause of the compression problem should be instantly identifiable upon taking the cylinder head off! look for a big hole in the center of the piston, or a piston cracked around the edge with a broken ring. when was the last time the engine was running? Last time it was running was a few weeks ago. I just havent had time to take it apart to see wha the problem is and to be honest it will be my first tear down on a quad.is it going to be very hard?? i have torn down vw motors and built them back using stroker cranks and that was pretty easy but as i said this is my first quad motor . Thought id give it a try since it was only the topp end. Quote Link to comment Share on other sites More sharing options...
flattrakker Posted January 6, 2008 Report Share Posted January 6, 2008 im 14.. i did it.. its very easy.. Quote Link to comment Share on other sites More sharing options...
sheerider1026 Posted January 6, 2008 Report Share Posted January 6, 2008 these are the easiest motors to work on period!!! even the bottom end is simple, if u can fix a bowl f cereal you can work on a banshee motor! Quote Link to comment Share on other sites More sharing options...
hyperlite33 Posted January 6, 2008 Report Share Posted January 6, 2008 if u can fix a bowl f cereal you can work on a banshee motor! :yelrotflmao: :yelrotflmao: :yelrotflmao: Yeah it is about that easy! Quote Link to comment Share on other sites More sharing options...
daisy Posted January 7, 2008 Author Report Share Posted January 7, 2008 Last time it was running was a few weeks ago. I just havent had time to take it apart to see wha the problem is and to be honest it will be my first tear down on a quad.is it going to be very hard?? i have torn down vw motors and built them back using stroker cranks and that was pretty easy but as i said this is my first quad motor . Thought id give it a try since it was only the topp end. I HAVE ANOTHER ? I tore down my motor and found that the sleeve on the bottom of the piston was borke off and the rings was froze in the piston. well my ? is im thinking that the peice broke off of the sleeve is in the bottom of t he motor. Well if that the case how hard is it to slpit the block to get it out or can i just take one of the side cases off to get ot out? Quote Link to comment Share on other sites More sharing options...
brian Posted January 7, 2008 Report Share Posted January 7, 2008 do yourself a favor. get a Clymers manual for your bike. it will help you out alot also, check this out: Big Red's teardown Red did a really good job of showing you how it is done. Have Fun !! Quote Link to comment Share on other sites More sharing options...
brian Posted January 8, 2008 Report Share Posted January 8, 2008 nevermind that thread. all of the pics have been removed cuz someone fucked up their crank and blamed it on Red. just get the Clymers and folloe the step by step instructions. Quote Link to comment Share on other sites More sharing options...
daisy Posted January 8, 2008 Author Report Share Posted January 8, 2008 nevermind that thread.all of the pics have been removed cuz someone fucked up their crank and blamed it on Red. just get the Clymers and folloe the step by step instructions. thanks Quote Link to comment Share on other sites More sharing options...
Fireroad Express Posted January 8, 2008 Report Share Posted January 8, 2008 yep, your looking at a complete tear down. a tedious job indeed! but there is no better way to learn about your shee than a complete overhaul. consider it a learning experience. some people go for years without really understanding whats going on inside the engine! try to work in a clean area as there are alot of parts that can go missing! have fun! Quote Link to comment Share on other sites More sharing options...
chillls Posted January 8, 2008 Report Share Posted January 8, 2008 :biggrin: go all the way :biggrin: go big or go home :beer: Quote Link to comment Share on other sites More sharing options...
toyotaman Posted January 8, 2008 Report Share Posted January 8, 2008 get the motor as clean as possible before you start tearin into it. i like to take pics on a digital camera as i take it apart so if im ever wonderin about how something goes in i can go back and look at the pics. it helps me! :cool: Quote Link to comment Share on other sites More sharing options...
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