How can I tell if my engine has been rephased ?

[007sparky]

Hi Fred , I'm certain the bike has been rephrased but not sure to what level ?
The compressor is high for sure , the engine has new gaskets all round and the engine oil is so clean it looks like it's never ran before , the view from inside the oil filler looks like the engine has been steam cleaned its so clean .
I guess I have no way of knowing if bigger pistons have been fitted or any other bits but I guess to get the bike rephased and spend out on battery free ignition they have been spending on the bike so may well have done a propper job on the engine ! !

 

[jay760]

Easy way to see if it has larger pistons if it is 750 it will have a flat lip around the edge of the piston you should be able to just make it out by shining light down the plug hole and turning the engine over until you can see the edge.

 

[007sparky]

Nice one jay will have a look tonight , you in Somerset UK ?

 

[TwoManyXS1Bs]

Here's some piston pics:

http://www.xs650.com/forum/showpost.php?p=364170&postcount=5

 

[007sparky]

Thanks buddy , don't recall mine looking like that to be honest but will double check

 

[007sparky]

Can't see enough of piston to tell , can see the numbers 95 stamped on the top of the piston though ?

 

[TwoManyXS1Bs]

If you do the upper left google search, using "piston+number+bore+size+factory", there'll be several threads that may explain that stamping...

 

[007sparky]

Cheers buddy

 

[007sparky]

I think the number 95 stamped on the piston crowns is normal , don't think its a rebored bike I have