rotary disk valve engine

pappa_golf

I have an old kawasaki disk valve engine

this is the diskvalve http://thumbs.ebaystatic.com/images/g/MEoAAOSwRgJXkjPK/s-l225.jpg as you can see , its keyed to the shaft , but can be reversed

the only measurment I can find is "inlet port opens 115 deg BTDC

this is an old engine set at TDC

fitted

http://www.oldbikes.comuf.com/d1.jpg

and reversed

http://www.oldbikes.comuf.com/d2.jpg

am I right in thinking that the first position is correct , and that the cuttiut will just start to open the flow of fuel at 115 derg BTDC , whereas the second will allow flow AFTER TDC

as you can guess , I have rebuilt her , and she will not run

there are no markings on the disk , and the engine came in a box striped down

Mr.Generous

must be a KE something? I can offer no help other than a free bump sorry.

pappa_golf

yes its a ke125 , with verification I can check it with minimum work by looking thru the carb , but its a faily big job to strip it down to reverse it ,

B_G_B

I would agree, first photo looks correct from the info you have given.

Don’t know if this is of help. Page 50, section 42 mentions marking the valve on disassembly so that it can be reassembled the correct way. Sounds like whoever stripped it didn't do this.

https://www.manualslib.com/manual/860082/Kawasaki-Ke125.html#manual

pappa_golf

cheers , the engine was stripped when I got it

just checked via the carb and slowly turning the engine , I have set it as in the second photo , IE , its opening AFTER TDC , just found this on youtube https://youtu.be/YE3xrr3cz-k

shows the inlet opening as the piston is coming back up


horrible job to get to this thing , side off , clutch + basket off to get to the disk cover screws , and about £15 of "o" rings and seals ,

Moto2

pappa_golf wrote: »

am I right in thinking that the first position is correct , and that the cuttiut will just start to open the flow of fuel at 115 derg BTDC

Yes, that is how it's usually quoted

You can always take a file to it

pappa_golf

pulled the engine apart this morning , side off , clutch and basket out , disk valve cover of and reversed it , rebuilt here and she fired up first kick .

lots and lots of smoke as the piston/crank were well oiled and I had used a lot of grease during the rebuild

set the timing more accurate tomorrow with an ohm meter , and see if she actually runs !

original engine had a "digestion" problem , eat a M6 nut/bolt or something , massive damage to disk valve crankcases and crank plus damage to the barrel

for a 2 stroke they are a fairly complex engine