jan de groot engine ,af frame

[royceymon@hotmail.co.uk]

Heres some photos of the jan de groot engine for dutchie , frames on hold until i get the frame rails from jerry at jfab!

[Dutch-K5 Fan]

Thanks Roy

Great to see how they find small things to improve a engine.
Whats that on the carb??

Dutchie

[royceymon@hotmail.co.uk]

Hi Dutchie
               hope all is good with your little girl ,will post a pic of my liitle girl on her pw50 (now a 21yr old ) havnt got a scooby what the bits on the carb are or how the burn pattern on the piston formed , havnt been able to replicate it since ,trouble is with poor old jan deceased dont know who would know ,or what the material is on the clutch cover,kips covers and the water pump im guesing magnesium??

a tester for kx riders forum .piston burn pattern .carb bits .material of covers   any ideas guys?

[DoldGuy]

Royce,
My guess on the carb setup is a powerjet circuit, clutch cover setup Magnesium, pattern on the piston showing transfers are balanced (noticed it had a window mod too), gear position sensor on crankcase to alter timing, which leads me to the question about the flywheel on there (need some pics posted up  ) also what type of ignition setup (CDI, Coil, Stator) as it surely has to be Factory Kawi to work with the Gear Sensor. It appears that you truly have the "Real Deal" that only very priviledged eyes have seen. Definetly want to see more pics of this motor & more info on the cylinder, head, pipe etc..
Thanks for Sharing!
DoldGuy

[kaw rider]

That looks like a 250 motor. The gear selector looks like for a road bike motor. The flywheel looks like a 250 flywheel too. The burn patterns looks alittle on the fat side put does look good.

[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

[royceymon@hotmail.co.uk]

sorry duh forgot ive put the flywheel already on !!

[jonny500]

thats the works clutch arm too. i know that from seeing 1 of kurt Nicols bikes. that motor is an awsome find i think you are the envy of this site right now

[royceymon@hotmail.co.uk]

im in the process of trying to find who was working with jan de groot in 2003 to understand what the carb was all about and what the number engraved on the crank meens, the flywheel deosnt look my old standard one on my old standard engine, not sure if its wieghted or not?

[royceymon@hotmail.co.uk]

some photos of the serial number 001 !! the cooling hose has vibrated over the number some marks on the left hand side looks like 00 cant see any signs off forgery ive used some special dye from work no signs of anything untoward , i know its an authentic engine from were it came from
cdi unit reads 21119277-055eu   5-071000-131   2c67
loom reads 26030250-055c  its got wrote on what looks like either tp3/5 or tps its also got a name on the side of the engine need some help from dutchie on that one.  more to follow

[Dutch-K5 Fan]

Looks like I'm just in time

?5th | World Championship 250cc | Kawasaki | Kenneth Gundersen
http://www.xtrig.de/index.php?lang=EN&page=kawa_racing_team

Looks like a engine from Kenneth Gundersen if look at your last picture.



PS Roy my litlle girl is doing fine




Dutch