Yamaha CP3 Cam Wrench
Description
This is a free design from JK3D.us - I will print one for you as well if you need (for a minimal cost. Just go to JK3D.us and request it. This is a small hand wrench used to help set timing on the Yamaha CP3 engine. By default the exhaust cam is off by about 1-2 teeth after installing due to the loading from one of the exhaust valve sets. This wrench will allow you to Rotate the exhaust and intake cam to allow enough slack on the cam chain to move it a tooth. There are 3 holes in the wrench, the 2 that go vertically are for the Intake cam, and the 2 that go horizontally are for the exhaust cam. the picture shows a prototype version on the bottom, but the same concept. Parts needed (per wrench, 2 wrenches needed to move both cams): 2x 5MM bolts preferable not longer than 15mm thread length, and stainless steel if possible (its softer than the metal used on the cams so less chance of marring the cam sprockets) and 2 thin nuts. (Clearance on the intake side is not much so you may need to mess with screw length) Process: If the exhaust cam is off by a tooth or so (as it should be at install) 1. Ensure the Cam Chain tensioner is not installed yet 2. Ensure the chain is over the cams and that the intake cam is lined up on the timing mark per the manual. 3. Refer to this video https://www.youtube.com/watch?v=dcaRfLx3_v4 it will show you how to set timing, he uses his own tool. The Zip Tie method to secure the chain on the sprocket before the chain tensioner is installed is great, use that. I only needed one zip tie per sprocket. 4. Use the wrenches here to to what that video shows. Place the screws you put in the wrenches into the holes on the cam sprockets. 5.Rotate the Intake cam slightly clockwise and the exhaust cam counterclockwise to let it line up with its timing marks. You can hold the chain "slack" with these wrenches both with one hand to secure the zip tie on the exhaust cam. (You can see the rough placement from the picture included with this project) 6. Install the CCT per the manual and cut the zip ties off the cam sprockets and go through the rest of the process. (I don't have any pics of me using the wrenches because my hands were full doing the work.) *** Notice - I am not responsible if you screw up your engine or do something by mistake. Read the service manual carefully, doing timing wrong can destroy the engine. Check, recheck, check again, and very very certain you know what you are doing***** Material: I printed mine in PLA+ (Cheap, and fine for this kind of work) at 5 perimeters, and 4 layers top and bottom, with a triangle 30% infill. The wrenches will have some torque on them so printing sturdy is best.
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