Join Date: Jul 2009
Location: Kalahari Desert, South Africa
Friendly request to moderators. Is it perhaps possible to sticky this to the 350 discussion? As it is under 700 maintenence? Or maybe sticky a specific procedure?
The following procedure is not my own, copy paste job from old post.
Join Date: Nov 2006
Posts: 9 Re: 350 valve adjustment / crank seal
How to check and maintain: THIS IS ALL U NEED FROM TOOLS TO WAT TO DO!! HOPE IT HELPS
You will need:
17mm socket and ratchet set.
10 mm socket.
5mm allen wrech.
feeler guage set that has stock sizes (6-8 thousandths on the exhaust, 4-6 on the intake valve)(different if you have aftermarket cam, i set mine to what my engine builder says .003 intake and .004 on the exhaust)
BIG flat head screwdriver
now youre ready.
Take off the crankcase timing mark cap, cam sprocket engine sidecover thing(on head), and valve covers.
Now while you have the socket on the bolt that is holding the cam sprocket on, spin the engine over with that while looking in the timing check hole on the crank. wait till the T (tdc) mark on the mag. lines up with the line on the case. The look up at youre cam sprocket and make sure that lines up with the line on the head. (make sure its a compression stroke).
Now while everythings lined up, take the 10mm and loosen the jamnuts on the tappits on the rocker arms. This will allow you to adjust the tappits up or down.
take youre feeler guage (stock specification clearance) and put it between the tappit and valve stem. then tighten the tappit down with the 4mm wrench and tighten the jamnut. Once done with both intake and exhaust valves, make sure jamnuts are TIGHT, and make sure you can fit the feeler guage you used back under the tappit but noting smaller or bigger.
Then put the valve covers, head side cover, case timing plug, and the tank back on and fire it up.
Unknown terms you might like to know (nooBs):
Tappit-called something else by yamaha....the bolt that is in the end of youre rocker arm once the valve cover is off....when engine is running it pushes down on valve stem...not hard to find.
Jamnut- the locknut that holds the tappit in place when tightened.
Feeler guages-like diff. thickness little paperlike stainless steel things used for measuring small clearances....will get pics of stuff next time i do mine.
Engine tdc: TDC means TOP DEAD CENTER. Its when youre piston is at the highest point in the combustion chamber it will ever get.
As for just checking them and possibly not having to adjust them:
Instead of loosening jamnut so you can adjust the tappit, just line all the markings up so the engine is tdc and then stick the specified thickness feeler guage between tappit and valve stem. make sure the right one fits. then see if a size bigger or smaller fits. if not, then youre in the clear (how i check mine).
Last edited by Pacific Barbarian; 09-25-2009 at 12:59 AM.
Reason: added info