jan de groot engine ,af frame

[Motorrad]

requesting pictures of intake ports. transfer tunnles, etc...

[royceymon@hotmail.co.uk]

thanks dutchie your a life saver , makes sense now initials T.G can only be his engine ,there is also some very faint white paint pen initail again with T.G, id love to know what the engraving on the crank means !

motorrad i will try and get some shots of the transfers etc sometime this week , luckily its still stripped down at the mo , i must admit i was a little disapointed with the barrel it doesn't look realy ported out , it came in one lump so i guess it was what they run .mind you you wouldnt want any more power its a bit potent as is , i dont intent to do anything to it ,i think it would spoil the authentisity of it!!
 photos of carb intake and magnesium pump

[royceymon@hotmail.co.uk]

hi motorrad photos of the ports etc ,will do in 2 batches as i cant post too much at once regards jerry h

[royceymon@hotmail.co.uk]

more engine etc shots

[don46]

   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).  

All the Kawi 4t run the gear selector, they can alter the timing based on gear selection, they also increase the idle when in gear, this I believe was to help prevent stalling.

Interestingly, in 03 the 250 came with the PWK with power jet and TPS. but in this case they used an old stlye Kehin carb and modded wtih power jets external, there is probably jets under the brass screws. this piston doesn't look like the flat top pistons I've ran, it appears from the picture that it has some crown to it. The cylinder does not look as though it was ported, the SR designation on the Crank indicates that it was a factory race bike, they used to have the SR as in SR250, these were the real works bikes, the US hasn't had the full on works bike for years, of course even sayiing that they have suspension that cost more than my house.

[royceymon@hotmail.co.uk]

sorry the shots are not that good ,from what i can see the transfers had been cleaned up a bit and the internals looked as if they had been vapor blasted leaving a very fine sheen ,on the kips side i would have to put a standard set against the de groot stuff to see if there was much difference, the piston is domed its not wiseco and def not standard piston , i would dearly love to find out who worked on this engine when gunderstorm (think thats the correct spelling) was riding it! to find out the true spec and story behind it

[royceymon@hotmail.co.uk]

sorry guys kenneth gundersen

[royceymon@hotmail.co.uk]

kawasaki works piston V wiseco standard

[royceymon@hotmail.co.uk]

ive started a monster!! started the chop out today , made a jig to hold the frame whilst setting up ,perhaps a bit over the top but were going to use lazers to make sure its all central .perhaps im being a bit anal about it dont know whether any of you other guys made a jig ,when i made the first cut on the main down tube it opened up and moved slightly over to one side but marginal .dont know how im gonna get the rad mount on the left hand side sorted as you can see more main tubes gonna have to come off ...it seems to be a very "snug fit" hours and hours to go ,did about 5 hours today and didnt seem to achieve much although saying that i redid the swing arm spacers down from 17.5 to 17mm gonna be a long haul!!!!!

[royceymon@hotmail.co.uk]

did some more today ,forgot the camera duh, cleaned out the frame from old stuff chopped off a bit more main tube cut the y section down sanded sides and front and cleaned inside to refit to down tube ,not long before the tiggin starts , oh and sanded back old top motor mount flushed ready to weld on shortened old one might leave it offset and bend some lazered out new profiles or move over and use straight ones ...does seem the sensible option less agg movin it over..
dont know what to do on the kickstart front might get some of the 25mm ali plate  we have water jetted out to make a new kickstart new shape using cad

[royceymon@hotmail.co.uk]

today couldnt have been any sweeter ,spend all day up cusses gorse practicing with my son ,was a bit cold but the sun came out and it was fast....meanwhile back at the workshop rog was tigging up the frame rails for me , i can tig but rog is the master !! will post some photos tommorow night if i get back from london at a sensible hour!!

[royceymon@hotmail.co.uk]

finnaly making some progress , next step welding brace on where frame rails meet down tube to beef up ,mounting brackets for front and bottom engine mounts, top engine mount , get some mounts lazered out . remount rads and cut to suit ,change entry-exit points to suit ...have a rest....

[royceymon@hotmail.co.uk]

Finaly making some progress ! engine mounts welded on ,front ,bottom .Top mount from kxf cut off made shorter re-welded on and new plates from frame to head fabbed,spacers for bottom and front engine mounts made on lathe to line up front to rear sprocket.
rhs rad fitts with only very slight mod , left hand well to long not sure to chop off part of bottom and reweld also making whats left bigger to take more fluid ...or get another rhs remove plates on side swop around to make it handed the other way , weld up the additional filler cap hole .
bizzarly my sons rad grill from his 2006 kx125 fits straight on the kxf back to front rad !!
next task working out the flow from kxf hoses and rads to kx250 pump etc set up not sure what the rotation is?
im assuming hot fliud to top of rad colder from the bottom??? sure i saw some diagrams somewhere on this site ?? any ideas guys???

[royceymon@hotmail.co.uk]

found the diagram on my favorites from the sweedish gent hopefully full steam ahead only the airboot usual probs to slow me down , not sure how the exhaust is gonna work poss use a 2004 0r 2005 if the 2003 is a bad fit , might cut and tig to suit

[stevea100m]

Im using the 03 motor and the pipe comes close but still clears. One guy in the 500 section used the radiator off of a yz80 for the left side. said it fit right on the bike.