Hey guys. I have a orion 2007 125cc with engine number DJ154FMI.
Ok, got the bike with a bent inlet valve. Ordered new valves and timing chain according to the engine number. Firstly the new chain was a link longer so I first used the old chain to check everything. Thats where things went well weird. I put the timing in spot on (I am a mechanic so I know what I'm doing) turned the crank by hand to check and on the seventh revolution off the crank the inlet valve hits the piston! So obviously the ratio between crank and cam gears are out. So i found out from the previous owner that he changed heads. Problem is now i have 3 heads,One of them must be the 110cc cos the valves are much smaller, 4 cams and only 2 cam gears. Problem is the only gear that fits on the original head,according to the previous owner, is a 28 teeth wich means the chain i got will be far too long the other gear is a 32. i also have a 34 gear that doesnt fit on any off the cams but it seems to be the right size for the length of the chain i got from the agents. Can anyone make heads or tails out of this. I've tried finding a manual for that specific engine number but nothing. and the agents here in SA are not helpful at all!
Ok, got the bike with a bent inlet valve. Ordered new valves and timing chain according to the engine number. Firstly the new chain was a link longer so I first used the old chain to check everything. Thats where things went well weird. I put the timing in spot on (I am a mechanic so I know what I'm doing) turned the crank by hand to check and on the seventh revolution off the crank the inlet valve hits the piston! So obviously the ratio between crank and cam gears are out. So i found out from the previous owner that he changed heads. Problem is now i have 3 heads,One of them must be the 110cc cos the valves are much smaller, 4 cams and only 2 cam gears. Problem is the only gear that fits on the original head,according to the previous owner, is a 28 teeth wich means the chain i got will be far too long the other gear is a 32. i also have a 34 gear that doesnt fit on any off the cams but it seems to be the right size for the length of the chain i got from the agents. Can anyone make heads or tails out of this. I've tried finding a manual for that specific engine number but nothing. and the agents here in SA are not helpful at all!