use a piece of modeling clay,( you can get any wal-mart craft section). place on top of the intake valve relief . place the head on the motor with a few bolts and with a week spring and your valve in place, compress the valve and measure the clearance with a dial indicator and this should tell you thickness of the head gasket you need.
The Valve clearance for a 1993 TRX Honda Fourtrax is 0.03 on a feeler gauge. 0.03 -intake 0.03-exhaust
Type your answer here... Burnt intake or exhaust valve, hole in piston, broken piston rings, bad head gasket, valve spring broken.
I wouldn't be so worried about the heads as the pistons. Make sure you have enough clearance so that an open valve won't hit a piston.
.15mm or .006 inches when the engine is cold. Check out my bio page if you need help with the procedure.
.003 on intake and exhaust
Valve guides and/or valve seals can be worn. Allows oil to get into the combustion chamber.Oil consumption and smoking are signs of either bad piston rings or bad valve guides/valve seals.A compression check on each cylinder can help determine which.
it should de-stroke it to something around a 327. it will fit but be sure to check for crank to piston and piston to head cylinder top clearance to ensure you don't run into engine detonation. ummm no 305 and 350 have same stroke a 400 crank would make it a 334... same main and rod journals also stroke is 3.48
check the piston rings but that a typical thing any 350 dose check the piston rings but that a typical thing any 350 dose
It might. Better check first.
To adjust the valves on a Yamaha 350, first, remove the valve cover and ensure the engine is at top dead center (TDC) on the compression stroke for the cylinder being adjusted. Use a feeler gauge to measure the clearance between the rocker arm and the valve stem, adjusting it to the specified clearance by loosening the lock nut and turning the adjustment screw. Once the correct clearance is achieved, tighten the lock nut and recheck the clearance to ensure accuracy. Finally, replace the valve cover and ensure all fasteners are securely tightened.
The problem could be valve seals or excessive piston ring blowby. You could try changing the pcv valve on the valve cover and check the line going to the intake plate to make sure its not stopped up or the intake plate isn't stopped up. However, it most likely means that the piston rings are worn out are broken. Time for a engine rebuild. That is the only way to fix that problem.
Stock 350's have hydraulic lifters, so feeler gauges aren't needed. Get yourself a Chilton's manual or similar and read up on the valve adjustment process.