burnout

Hi anyone, I've torn down a 1994 yz250 two cycle engine only to find a burned piston and rod bearing. The crank case sections are apart. I need to pull the crank. Do I have to use the Yamaha "screw out the crank tool" or is there another method to remove the crank from the right side? I have another spare crank and rod, so all I have to do is swap. Also, is installation the reverse of removal? Any proven methods to get things moving again, would be appreciated. Many Thanks!

Did you check the spark from each plug wire? If your not getting spark from one of the wires it maybe be your coil.

Hi anyone, I've torn down a 1994 yz250 two cycle engine only to find a burned piston and rod bearing. The crank case sections are apart. I need to pull the crank. Do I have to use the Yamaha "screw out the crankshaft tool" or is there another method to remove the crank from the right side? I have another spare crank and rod, so all I have to do is swap. Also, is installation the reverse of removal? Any proven methods would be appreciated. Many Thanks!

Hi, I am in the process of installing new contact points on a '74 DT175A. I have purchased 3 sets of points for this specific model and none of them fit. The rubbing block on the points will not touch the lobe on the flywheel, hence, I assuming, incorrect points. (no bump, no intermittent spark) The engine is original, numbers match, and the flywheel numbers are correct for this engine. I have elongated the attaching hole, filed points metal for clearance and still no rub on lobe. Obviously, I haven't gotten to the timing or points gap, yet. Any help earns eternal gratitude. Desperate! Many Thanks!