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my own kx 60 problem

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madness:
well bought this bike awhile back. had the top end done when he did it they he said they made some mods to the intake but not the exhaust ports. had the carb cleaned and rejetted. problem is that when you ride it. it runs crappy cuts out and Excellerates very poorley. the bottom ends has been pretty much replaced minus the crank. i have had it to 2 different motorcycly shops. when i get it. it starts right up. but then goes back to the same thing. so the only thing i can come up with is the mods to being done to just the intake side and not the exhaust. the reeds have been replaced but still stock. the spark plug is fine. the timing has not been changed. any ideas. i have changed the muffler packing thats fine. the air filter i keep clean.   

Magnus:
If you did not tell them to make any modification then they shouldnt do it. I would ask them what they did, and if they did a bad port job then IMO they owe you a new cylinder :-(

Could of course be something else but seems likely that they made a mistake..

I am not a fan of doing to much to standard porting on anything, and if done it should be done by someone with experience.. if it is the mod that is the problem then you could take it to someone who does porting to se if they can "save" it by doing a complete port job..

have you checked the timing with a strobe light? and what change did you do to the jetting? 

madness:
no i havnt checked the timing with the strobe light. when they did the carb the first time they went down a jet. then when i took it to the dealer they took it back to where it was before the carb jets where messed with. how about the reeds he said they put new ones in but just looking at different things. well i have a spare jug i guess thats what you call it but i am going to send it to eric gore and have him redo the old one put new pistons and rings. just thought i would check and ask some questions before i went that far. seems odd to me that you would do something to the intake side and not the exhaust side.

madness:
if the timing has to be changed do you have to have the piston at top dead center

Magnus:
I dont know what the timing should be on the kx60, but check that the flywheel has not moved on the crankshaft ( in rare cases the flywheel key can brake). The cdi often have a built in advance/retard function on most modern bikes, and I have seen cdi boxes lock in a full advanced or retarded state.

If you use a strobe light on the timing marks on the flywheel and stator, you should see that the marks align at some rpms and move away at other rpms. If you have the manual, it probably will list the timing advance in degrees at a certain rpm. 

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