Bike an heads

[Blackzed]

So I put a set of bikeman heads and pipe on my sled last fall but now I can't get it to build any rpm 7300 to 7700 on my 800. seller said they are 13 :1 head but it lost a lot of snap in the sound of motor thinking they are low compression heads is there any why to tell
With out tearing it apart again or am I missing something?

 

[Justin_sane]

You would have to determine the fluid volume of the combustion Chamber. Usually cover it with glass that has a hole in it, fill it completely with distilled water, then measure the water volume it took to fill. Then compare with the enginr spec to determine compression. It would require removal though.

You may be able to use compression test numbers but it wont be as accurate. It could be influenced by other factors as well.

 

[Blackzed]

Thanks I'am heading back to work so I'am going to tear it down and find the problem got a 3 day ride planed would hate to miss it