Maintenance & Technical > KX450F / KX250F
jan de groot engine ,af frame
suicyde:
that ignition cover is a 250, it says stroke 72mm on the clutch arm, the 500 is 86mm.
DoldGuy:
In my overly excited way, I ASS U ME D it was a K5 motor but after Kaw Rider posted I also noticed the ignition cover (250) and quickly realized it was not a K5 motor & the flywheel is just that a 250 flywheel. I am still very curious of the gear sensor & how it ties in to the ignition as I have never seen one on the Kawis (Honda used to always use them back in the day). Also curious on the clutch cover setup as the Factory Bikes would run the mag covers (Just for weight? Extra Plates in the Basket?).
Royce, are there any numbers on the cases to determine what model year it is? Also can you post pics of the carb showing the Air Intake side?
royceymon@hotmail.co.uk:
sorry to disapoint guys its a 2003 kx250 grand prix engine not 500 , i will post more pictures of the bits requested all the kips covers a mag too and the water pump.
i would have to look at the engine number if i remember its stamped 8 or something similar ,not a full number though saying that it shows no signs of sanding or bodging in any way ,ill also photo the ignition module.
it came from someone i know (hardcore racing) uk so i know its real and not some tuned up "special" i only got it by luck!! i couldnt replicate the burn pattern ,but it wasnt running as lean as i would like when its in the af frame ill spend some time getting the jetting on the money
DoldGuy:
Royce,
After looking some more at the pics, I also noticed that it is a single ring piston (2003 motors were dual rings) which I will ASS U ME again that this is the Flat Top piston and would need a different head design on that. Have you changed the piston?
DoldGuy
royceymon@hotmail.co.uk:
yep well spotted ! the motor came with 3 spare pistons all single ring ,its a jan de groot forged piston will accept standard kawasaki ring i was told when i run out i could get wiseco to make some/match . ive got a twin ring old wiseco piston from my old standard kx 250 which is similar ( 2 ring ) but machined different from the jan de groot one ! flywheel photo enclosed
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