New to the board
Arm chair racerNew to the board
82' 185s. The cam itself has a mark on it, a small triangle mark. Which position does this need to be when the engine is tdc? I am not talking about the cam sprocket that has the o mark on top! The cam itself can be turned inside the sprocket 180 degrees then bolted in place. I was told that the lobes need to be facing toward the piston when the engine is tdc. My mark on the cam is on the opposite side of the cam when this is true. I will post a pic if I need to. Thanks everyone.
Last edited by Greenthumb; 11-25-2010 at 11:28 PM.
Power User
Roostin Away
Probably one of the most important things to mention first is - what machine is this work being done to? Does the cam sprocket have a mark as well? If so, I would think that the mark on the cam, and the mark on the cam sprocket should line up, if possible. Good luck!
THE 80's RAGE! Currently owns:
81, 85 Yamaha Tri Moto 125
83 Yamaha Tri Moto 200 x2
82,83 Yamaha Tri Moto 175 project
85 Yamaha Tri Z 250
84 Kawasaki Tecate 250
84 Honda ATC 70
85 Honda ATC 350X
84 Honda ATC 250R
(2) 84 Honda ATC 200x
82, 83 Honda ATC 185s
81 ATC 200
Lots of other parts and bikes
New to the board
Arm chair racerNew to the board
My bad its an 82' 185s. And there is a o mark on the cam sprocket that is to be lined up at the top mark on the cam cover when the engine is tdc.
Originally Posted by Yamaha_Rules69
Got The Holeshot
Arm chair racerJust too addicted
Cam lobes have to be facing down
1985 200X
66mm H&S Piston
Little Bit Bigger Cam
Bassani Exhaust
1985 350X With Bassani Exhaust
1983 Honda 200E (PARTING OUT!!!!)
1985 Yamaha Tri-Zinger
My Feedback Threadhttp://http://www.3wheelerworld.com/showthread.php?105185-Feedback-for-RodKnockRacing&highlight=RodKnockRacing
At The Back Of The Pack
Arm chair racerFirst time rider
Remember that the cam turns at half engine speed, so at TDC the cam lobes could face down or up, and the piston will still be at TDC.
When the lobes face down they face away from the cam followers. The valves are fully closed (there will be a clearance) and the engine should have just fired. When the lobes face up both valves are slightly open together. No way the engine is going to fire then with no compression.
Custodian of:-
85 Tri Z - need rear plastics to go with Mosh seat cover
83 200x - engine being rebuilt but lodging with a friend
85 250r - also lodging with a friend until I have a new shed
....and a different kind of Z
New to the board
Arm chair racerNew to the board
I have seen the error of my ways. The cam was upside down. Runs fine now. Thanks everyone
Reply With Quote
