Maintenance & Technical > KX500 Original

Sleeve Transfer port matching

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3Razors:
Hi, heres the deal just pulled the cylinder from one of my K5's for the first time and to my dismay its has been sleeved.  It was ported by FMF from the previous owner and ran pretty hard.  Now here is where it gets interesting in the upper transfer port area the sleeve is not flush with the transfer port and it hangs down I'd say 2-3mm below the top of the port.  On the bottom of the transfers the sleeve is nice and flush/matched to the port.  I don't know whether somebody did this on purpose for better performance or was just a knucklehead not knowing what they are doing.

Next question for anyone that has installed a sleeve in a completely stock k5 cylinder did the sleeve match the transfer ports exactly? How much if any at all was the difference in overlap?  I have another virgin plated K5 cylinder and the stock transfers look larger than the openings on the sleeve.  I'm out of town for the week and havent got a chance to mic them out to compare them.

jonny500:
has it been done on purpose? i have never heard of a mod like that (to ruduce tranfer duration). but 2 - 3 mm is massive interms of port duration.
or maybe the cylinder was ported by fmf and then some time latter was fitted with a standard linner.
 i presume you are suggesting that you grind the affending area flush. DONT. if you do this you will alter the transfer port duration, you will increase it by several degrees if you remove the 2 - 3mm. you need to get a port map of the standard cylinder and compare it to your cylinder. also the shape of the top of the transfer port is important to how the engine runs so any grinding needs to be done by someone that knows there stuff. my advice to you is if the motor was running ok before the strip down then leave it be. if you mess this up then you may have to buy a new cylinder.
 

3Razors:
It appears it was done on purpose, or unless they forgot to match the top of the ports?  I mean all the lower parts of the sleeve were ground on to match up, same with the intake porting.  Maybe someone got in a rush at fmf and didn't do the job right?  It just doesn't make sense to me as ports in the sleeve don't even appear to be as large as the ones in this other stock cylinder.

The bike did run great and faster than a stocker for sure.  But I won't be grinding on anything, I have an expert engine builder here Jerry Hall that I'm going to take it to for his opinion.

GREENKAW24:
The sleeves from L.A. Sleeve don't always match the ports in the cylinder and need extensive blending to get the ports back to stock size and height.Sometimes the locations of the ports in the sleeve are off too, making it difficult to match everything. It could be one of theirs installed in that cylinder, and nobody took the time to match the ports fully.

kaw rider:
is it the left or right side rear transfer that has this.

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