![]() ![]() Using your dial gauge as you plan, check both measurements and see how they line up with the degree wheel. The exhaust valve opens 48 degrees before bottom center and closes 27 degrees after top center. The intake valve opens 34 degrees before top center and closes 55 degrees after bottom center. ![]() ![]() Do I set the cam as soon as it moves the finger on the dial? – Albert/via emailĪ: The information I have shows the pre-unit and unit 650 twins with the same valve-timing specs. Can you please talk me through the process, remembering that I only have the idler pinion to adjust with as the gears are on the cams and I don’t have a tool to pull them off? Can I simply set the cams and crank at the spec BTDC (both top-dead-center) and slip in the idler pinion? I realize that each cam/crank BTDC must be done individually, and I can do this using paint marks as the gears rotate, or also using a dial gauge on the cam follower. The gears are on the cams, and I have a manual that gives the valve timing figures for the T120 that this engine spec is now close to, i.e., T120 cams, etc. The problem I have is the marks on the timing gears that came with the engine (in bits) do not match the images in my manual, so I have to time the valves with a degree disc and dial gauge. Q: I am presently building a Triumph 650 engine that has a pre-unit bottom half and 9-stud unit barrels and head. ![]()
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May 2023
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