COMPRESSION

[yamahajunky38]

will having almost no compression in my cylinders cause my banshee to not run???

[LegendSS28]

yes sir

[KoooPSD]

Yup that'll do it.

[yamahajunky38]

what will it take to fix it? my shee just quit on me when i was riding a couple of weeks ago and when i checked it when i got it home, it was getting spark, gas, and everything else it needs to run, but it wouldn't run. i took it to repair shop and they said that it was probably the compression being so low causing it not to run.

thanks for the help

[yamahajunky38]

bump

[JohnnyWadd]

I sounds to me like you'll need to rebuild the top end, pistons and rings. You'll need to get the cylinders bored. How old is the engine? Could it be a gasket?

[sredish]

Have you actually tested the compression? Sounds like someone was just giving you "ideas". While not saying it is or it isn't, it'd be good to validate that with some compression numbers. If you can get those and get back to us, then we can give you an idea of what's up.

 

If you compression is for sure low, then you'll either have to put a hone job and then rings or bore the next size with some new piston and rings. Not too big a deal. If you need to put a new top end in it, this is a great time for a little portwork. You can get it done inexpensive if you ask around and it's easy to do it then. I sent my cylinders off to get bored for the next piston size as well as ported. When I got them back, they were ready to go with pistons and rings included. Think it was 4 bills out the door for the whole deal.

 

Cool, let us know.

[dajogejr]

If you took it to a repair shop, and you're paying them to at least inspect it, I'd have them give you a round about price for repairing it.

 

They can't X-ray the inside of your bike's motor, but...they can give you a ballpark.

 

Then...price out the parts only, so you know what you can save doing it yourself.

Keeping in mind, that you're still gonna have to use a machine shop for boring and matching new pistons to your cylinders. The dissasembly and reassembly you can do yourself, no doubt saving a few hundred bucks...