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Interesting Compression issues.


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Hello everyone I am new to the forum so bare with me. I bought a new Banshee three weeks ago. The thing is pristine honestly looks like it came off the showroom floor. Starts first kick every time. I took it out riding and beat the hell out of it at the supercross track and it performed beautifully. Got it home and for shits and giggles I did a compression test. Both cylinders test at exactly 89 psi. That seems low to me but it does have stock heads stock Pistons and stock rings. Is it time for a rebuild? Or don't mess with a good thing and use her till she dies? She runs beautifully idles perfectly and doesn't smoke bad at all. Any input would be great. Thanks.

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Probably an issue with the test gave the low numbers, but getting an equal pressure on both sides is a good sign.  I have a similar issue with my cheap compression tester.  TDR recommended a few specific models and the craftsman compression tester was one, its affordable, about $65.

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I rented a tester from autozone

I did the same and got shit numbers

Get a quality tester

If you were running 89 psi you wouldnt be enjoying your bike as much as you are I can promise you that haha

Quality tester is the way to go :) Congrats on the new bike and welcome to the site! 

Edited by Ayesully810
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Go for a head that doesn't require stud removal / changing. Noss, chariot, or driveline....if your head hasn't been milled they can cut your stock head. Look into it.

 

Sent from my SM-S820L using Tapatalk

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Thank you blue that is what I will do then. I will get the radiator off eBay and all the supporting mods and do a complete rebuild in a year or two. Blue do you have a set of cool heads as well? Or do you think a high volume water pump and radiator are enough? I live in Michigan so it isn't like Arizona temperatures.

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ebay radiator and aftermarket pump here as well. Works great. I didnt go with the fancy silicone hoses. I use the cheap black NAPA stuff out of principle. Radiator and pump should be enough when tuned properly and you keep moving.

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