How long does a new top end last?

[NN2]

I just wanted to know roughly how long a new top end lasts (hours) before needing to be rebuilt again, given it was broken in correctly?

[wacko2000]

Im not sure if there is a right answer to this question, It all depends on how well the bike is tuned, how often the bike is ridden, how hard, proper maintance...etc........

My shee is a 2000, I bought it used in 04-05...Im a weekend warrior, I try to ride about once or month or so, I didnt have to rebuild my shee until this year, when I checked the compression is was at 110psi in each cylinder...So i rebuilt, I prob could have got another season out of it...

Some guys rebuild every season..

[BellicoseBanshee]

I just wanted to know roughly how long a new top end lasts (hours) before needing to be rebuilt again, given it was broken in correctly?

Could last for years...

 

It depends on how it is maintained, how it is used, and how well it was machined/assembled.

[87_shee]

There are plenty of members on here that know much more than me and I'm sure them chime in but I would have to say that there are way too many variables to give an exact time. I have been on the same top end for 3 seasons now with no trouble, but my buddy has done 3 topends in 2 seasons. I belive it has alot to do with proper set up and regular maintance. thats my 2cents anyways

[shanYE west]

perry much what everyone esle said. I like to change the top end every season.. Keep an eye on the compression.. when it drops past a certain point.. Time for a rebuild. That point will vary from motor to motor depending on what the compression was when you started. But there is soo many variables....

Edited February 15, 2008 by Fouledout421

[csrmel]

another variable is porting. the more aggressive the port job, the quicker the rings wear out.

 

if you ride the banshee respectfully and not abuse it r overheat it you should get at least 50-70 hours out of a top end. i know i did. i bought mine new 2 years ago and to this day i still have factory perfect compression. i have at least 60 hours on this motor. i use this bike, sometimes hard, but i never abuse it. i always let it fully warm up before riding too. never let it overheat. i take religious care of my air filters and premix.

actually wash my filters 6 times in a row when they need cleaning. the first and second time get 98% of the crud, the next 3 times there is still a bit of sand that comes out. the 6th time i wash they usually come out clean with no sand in the sink and thats when i quit. call that overkill but i challenge anyone else to show me a factory motor with perfect compression after 2 years and 60 hours of use.

 

 

i think the 3 main things that kill properly tuned banshee motors are poor air filters, overheating and lack of respect of warm up time.

[chevy7398]

mine lasted 7 years on the stock bore till she started getting low on compression

[bansheejoel]

another variable is porting. the more aggressive the port job, the quicker the rings wear out.

 

if you ride the banshee respectfully and not abuse it r overheat it you should get at least 50-70 hours out of a top end. i know i did. i bought mine new 2 years ago and to this day i still have factory perfect compression. i have at least 60 hours on this motor. i use this bike, sometimes hard, but i never abuse it. i always let it fully warm up before riding too. never let it overheat. i take religious care of my air filters and premix.

actually wash my filters 6 times in a row when they need cleaning. the first and second time get 98% of the crud, the next 3 times there is still a bit of sand that comes out. the 6th time i wash they usually come out clean with no sand in the sink and thats when i quit. call that overkill but i challenge anyone else to show me a factory motor with perfect compression after 2 years and 60 hours of use.

 

 

i think the 3 main things that kill properly tuned banshee motors are poor air filters, overheating and lack of respect of warm up time.

 

 

i couldnt agree more :beer:

[shee4speed]

I think the 3 main things that kill properly tuned banshee motors are poor air filters, overheating and lack of respect of warm up time.

Here is your answer to the T. And make sure there is oil in the gas. :biggrin:

[Bansh-eman]

another variable is porting. the more aggressive the port job, the quicker the rings wear out.

your porting will not effect your rings. that is assuming that the edges of the ports have no imperfections that cause damage. as long as the rings and the cylidner are within tolerances and not ovaled the porting will not do anythng to the rings.

[csrmel]

your porting will not effect your rings. that is assuming that the edges of the ports have no imperfections that cause damage. as long as the rings and the cylidner are within tolerances and not ovaled the porting will not do anythng to the rings.

 

 

when you widen ports exhaust and transfer ports, knife edge the intake bridge (i have seen people even remove it for whatever reasons that i dont really know) , etc. you decrease the amount of surface area youre rings have to slide by when the pistons are down. when the piston is down and the ports are exposed the rings do slightly bulge outward since theres nothing to stop them and they have a natural tension to expand.. with a ported motor, they would bulge more than stock. its probably not a big deal, but it is an issue, espically with proper porting they shave a touch of metal off the edges of the ports to provide a smooth transition for the rings. although people still get a really long life out of a ported motor.

 

this is why a lot of 2 strokes have a bridge in the exhaust. the banshee doesnt have an exhaust bridge, but a lot of them do. its for ring bulging when the ports are open.

[smokin 2 stroke]

their all right..i was going to my 2 cents but all the basis were covered

[BellicoseBanshee]

when you widen ports exhaust and transfer ports, knife edge the intake bridge (i have seen people even remove it for whatever reasons that i dont really know) , etc. you decrease the amount of surface area youre rings have to slide by when the pistons are down. when the piston is down and the ports are exposed the rings do slightly bulge outward since theres nothing to stop them and they have a natural tension to expand.. with a ported motor, they would bulge more than stock. its probably not a big deal, but it is an issue, espically with proper porting they shave a touch of metal off the edges of the ports to provide a smooth transition for the rings. although people still get a really long life out of a ported motor.

 

this is why a lot of 2 strokes have a bridge in the exhaust. the banshee doesnt have an exhaust bridge, but a lot of them do. its for ring bulging when the ports are open.

The exhaust bridge might be nice for the rings, but it will damage the piston if not properly relieved and lubricated...

[shanYE west]

The exhaust bridge might be nice for the rings, but it will damage the piston if not properly relieved and lubricated...

 

Its available.. Look into the Viper Sleeves from Lakes Motorsports.

[sheerider1026]

i got 6 years out of a topend, when i took it apart it still started and ran great!! i use amsoil dominator at 50:1.. i always keep the filter clean, use an outerwear, and most important is letting the engine warm up before ripping on it.. just my opnion.