You guys have a superneat website

[paavojaelvis]

Greetings from Finland!
I've been reading your posts quite a while and found this site as a huge Penton/KTM tech&tip databank, thanks to You, POGgers. What a magnificent job you've done!  I myself have been tinkering with my two 125 KTM:s to get them back into life again and this forum of yours has really helped me a lot. Unfortunately, I still have a couple of problems, and I hope you could give me a hand. It's about the -78 125 GS6: the deck height, combustion chamber volume and ignition timing in mm:s BTDC. Engine # is 8-5107922. No racing intentions, trails riding only.
I would really appreciate, if somebody of you could help me with this issue.

Keep up your good work, guys!


w/rgds:
Paavo Pernu
Technician,Age 39
KTM 125 GS  -77
KTM 125 GS6 -78

[Mike Lenz]

Deck hight is .6-.7mm. IGN timing is .9-.95mm. Not sure what yoiu mean about the exhaust volume.

 

[paavojaelvis]

Mike,
is the deck height measured from the edge of the piston crown to top of cyl. liner?  Ign. timing: 0.9-0.95 mm BTDC sounds odd, I thought it was around 2.5 mm (0.10")?  With combustion chamber volume I mean the chamber in cyl. head. Somebody has machined the sealing surface and I'd like to find out how much the chamber volume has decreased.

Thanks,

Paavo